The mass of the helium in the blimp is 1080 kg.
To solve this problem, we can use the ideal gas law:
PV = nRT
where P is the absolute pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the absolute temperature.
We can rearrange this equation to solve for n, the number of moles:
n = PV/RT
where P, V, and T are given in the problem, and R is a constant (8.31 J/(mol*K)).
First, we need to convert the volume of the helium from m3 to L (liters):
6280 m3 x (1000 L/1 m3) = 6.28 x 106 L
Now we can plug in the values:
n = (1.10 x 105 Pa)(6.28 x 106 L)/(8.31 J/(mol*K) x 282 K)
Simplifying this expression gives:
n = 2.69 x 105 mol
Finally, we can calculate the mass of the helium using its molar mass:
mass = n x molar mass
The molar mass of helium is 4.00 g/mol, so:
mass = (2.69 x 105 mol)(4.00 g/mol) = 1.08 x 106 g = 1080 kg
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A plumb bob hangs from the roof of a railroad car. The car rounds a circular track of radius 340 m at a speed of 94 km/h. At what angle relative to the vertical does the plumb bob hang
The plumb bob hangs vertically downwards when the railroad car is at rest. However, when the car moves in a circular track of radius 340 m at a speed of 94 km/h, it experiences a centrifugal force that pulls the plumb bob away from the vertical.
To find the angle relative to the vertical at which the plumb bob hangs, we need to use the formula:
tan(theta) = (v^2) / (g * r)
where:
theta = angle relative to the vertical
v = speed of the railroad car = 94 km/h = 26.11 m/s
g = acceleration due to gravity = 9.81 m/s^2
r = radius of the circular track = 340 m
Substituting the given values, we get:
tan(theta) = (26.11^2) / (9.81 * 340)
tan(theta) = 2.146
Taking the inverse tangent of both sides, we get:
theta = tan^-1(2.146)
theta = 64.7 degrees
Therefore, the plumb bob hangs at an angle of 64.7 degrees relative to the vertical when the railroad car rounds a circular track of radius 340 m at a speed of 94 km/h.
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Light from a certain lamp is brightest at a wavelength of 668 nm. What is the photon energy for light at that wavelength?
Light from a certain lamp is brightest at a wavelength of 668 nm. 2.966 x 10⁻¹⁹ J is the photon energy for light at that wavelength.
The photon energy of light can be calculated using the formula E = hc/λ, where E is the energy of the photon, h is Planck's constant (6.626 x 10⁻³⁴ J s), c is the speed of light (3 x 10⁸ m/s), and λ is the wavelength of the light.
The energy and wavelength of a photon are inversely proportional. Blue light has a shorter wavelength than red light, hence it has more energy per photon than red light.
Blue light has shorter wavelengths, ranging from 450 to 495 nanometers. Red light has longer waves and wavelengths between 620 and 750 nm. Blue light is more energetic and has a higher frequency than red light.
The energy of a photon changes with wavelength; longer wavelengths have less energy than shorter ones. Red photons, for instance, have lower energy than blue ones.
So, to calculate the photon energy for light at a wavelength of 668 nm, we first need to convert the wavelength from nanometers to meters. This can be done by dividing by 10⁹.
668 nm / 10⁹ = 0.000000668 m
Now we can plug this value into the formula:
E = (6.626 x 10⁻³⁴ J s) x (3 x 10⁸ m/s) / (0.000000668 m)
E = 2.966 x 10⁻¹⁹ J
Therefore, the photon energy for light at a wavelength of 668 nm is 2.966 x 10⁻¹⁹ Joules.
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our point charges lie on the vertices of a square with side length . Two adjacent vertices have charge while, the other two have charge . What is the magnitude of the electric field at the center of the square
The magnitude of the electric field at the center of the square is 72 N/C.
E = k * q / r²
E1 = k * q / (a/2)² = 4 * k * q / a²
E2 = k * (-q) / (a/√2)² = -2 * k * q / a²
E = E1 + E2 = 4 * k * q / a² - 2 * k * q / a² = 2 * k * q / a²
Substituting the values of k, q, and a, we get:
E = 2 * (9 x [tex]10^9[/tex] N*m^2/C²) * (2 x [tex]10^{-6[/tex] C) / (0.1 m)² = 72 N/C
Magnitude refers to the size or extent of something, often measured on a numerical scale. It can refer to a wide range of phenomena, from the physical properties of objects and natural phenomena to the social and psychological dimensions of human experience.
In physics, magnitude often refers to the strength or intensity of a force or energy, such as the magnitude of an earthquake or the magnitude of a magnetic field. In mathematics, magnitude is used to describe the size of a number or a vector, typically represented as a positive value. In everyday language, magnitude can refer to the importance or significance of something, such as the magnitude of a problem or the magnitude of an achievement.
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An electron passes through a point 2.59 cm from a long straight wire as it moves at 32.5% of the speed of light perpendicularly toward the wire. At that moment a switch is flipped, causing a current of 16.1 A to flow in the wire. Find the magnitude of the electron's acceleration ???? at that moment.
The magnitude of the electron's acceleration at that moment is [tex]7.24 x 10^10 m/s^2.[/tex]
Why will be causing a current of 16.1 A to flow in the wire?
We can use the formula for the magnetic force on a moving charged particle to find the acceleration of the electron:
[tex]F = qvB[/tex]
where F is the magnetic force, q is the charge of the electron, v is its velocity, and B is the magnetic field.
The magnetic field around a long straight wire carrying a current I is given by:
[tex]B = μ0I / (2πr)[/tex]
where μ0 is the permeability of free space and r is the distance from the wire.
We are given that the electron passes through a point [tex]2.59 cm[/tex] from the wire, so [tex]r = 2.59 cm = 0.0259 m[/tex]. We are also given that a current of [tex]16.1 A[/tex] is flowing in the wire.
To find the velocity of the electron, we can use the formula for relativistic velocity addition:
[tex]v = (v_e + v_w) / (1 + v_e v_w / c^2)[/tex]
where v_e is the velocity of the electron, v_w is the velocity of the wire (which we assume to be zero), and c is the speed of light. We are given that the electron is moving at [tex]32.5%[/tex] of the speed of light, so [tex]v_e = 0.325c[/tex].
Plugging in the values, we get:
[tex]v = (0.325c + 0) / (1 + 0.325c x 0 / c^2) = 0.325c[/tex]
Now we can calculate the magnetic field at the point where the electron passes by the wire:
[tex]B = μ0I / (2πr) = (4π x 10^-7 T m/A) x (16.1 A) / (2π x 0.0259 m) = 0.0125 T[/tex]
Finally, we can calculate the magnitude of the acceleration of the electron:
[tex]F = qvB = (1.602 x 10^-19 C) x (0.325c) x (0.0125 T) = 6.6 x 10^-20 N[/tex]
The magnetic force is perpendicular to the velocity of the electron, so it provides a centripetal force that causes the electron to move in a circular path. The magnitude of the centripetal acceleration is:
[tex]a = F/m_e = (6.6 x 10^-20 N) / (9.109 x 10^-31 kg) = 7.24 x 10^10 m/s^2[/tex]
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You have 2 people on your team and you know your team's velocity is 0.6. How many person-days of productive work can you get done in 10 days?
With a team velocity of 0.6 and 2 team members, 7.2 person-days of productive work can be completed in 10 days.
Given a team velocity of 0.6 and 2 team members, it is possible to determine the number of person-days of productive work that can be completed in a specific time period.
In this case, we want to know how much work can be done in 10 days.
To calculate this, we simply multiply the team's velocity by the number of team members and the number of days in question.
Thus, 0.6 x 2 x 10 = 12 person-days of work can be completed in 10 days.
This means that the team can complete 7.2 person-days of productive work in the same time period, assuming that they are able to maintain their velocity.
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If an object is accelerating at a rate of 25 m/s 2, how fast will it be moving (in m/s) after 1.50 min
The object will be moving at a speed of 2,250 m/s after 1.50 min.
To find out how fast the object will be moving after 1.50 min, we first need to convert the time to seconds.
1.50 min is equal to 90 seconds (1 min = 60 seconds, so 1.50 min x 60 seconds/min = 90 seconds).
Next, we use the formula for acceleration:
acceleration = change in velocity / time
We know that the acceleration is 25 m/s², and we want to find the change in velocity. So, we rearrange the formula to solve for velocity:
change in velocity = acceleration x time
change in velocity = 25 m/s² x 90 s = 2,250 m/s
Therefore, the object will be moving at a speed of 2,250 m/s after 1.50 min.
The object's speed will increase rapidly due to the high acceleration rate, reaching a very high velocity of 2,250 m/s after 1.50 min.
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An ac voltmeter with large impedance is connected in turn across the inductor, the capacitor, and the resistor in a series circuit having an alternating emf of 140 V (rms); the meter gives the same reading in volts in each case. What is this reading
The reading on the ac voltmeter is the voltage of the alternating emf, which is 140 V (rms).
When an ac voltmeter with large impedance is connected in a series circuit across an inductor, capacitor, and resistor that has an alternating emf of 140 V (rms), the meter will give the same reading in volts for each component.
This is because the impedance of each component depends on the frequency of the alternating emf.
In this case, the frequency is the same for all components, so the voltage drop across each is the same.
Therefore, the reading on the ac voltmeter is simply the voltage of the alternating emf, which is 140 V (rms).
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What is the distinguishing characteristic of what we call ordinary matter (such as the matter that makes up stars, planets, and people)
The distinguishing characteristic of ordinary matter is that it's made of atoms, which consist of protons, neutrons, and electrons.
Ordinary matter, also known as baryonic matter, is primarily composed of atoms that contain protons, neutrons, and electrons.
Protons and neutrons form the atomic nucleus, while electrons orbit the nucleus.
These subatomic particles give matter its unique properties and allow it to interact through fundamental forces such as electromagnetism and gravity.
Ordinary matter makes up stars, planets, and living organisms, and is responsible for the observable structures and phenomena in the universe.
However, it only constitutes about 5% of the total mass-energy content of the universe, with dark matter and dark energy making up the rest.
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Find the rotational kinetic energy of a spinning (not rolling) bowling ball that has a mass of 3 kg and a radius of 0.16 m moving at 13 m/s.
The rotational kinetic energy of the spinning bowling ball is approximately 992.16 J.
The rotational kinetic energy of a spinning object is given by the formula:
KE = (1/2) * I * w^2
To find the moment of inertia of the bowling ball, we can use the formula:
I = (2/5) * m * r^2
Substituting the given values, we get:
I = (2/5) * 3 kg * (0.16 m)^2
= 0.3072 kg m^2
To find the angular velocity, we can use the formula:
v = r * w
w = v / r
Substituting the given values, we get:
w = 13 m/s / 0.16 m = 81.25 rad/s
Now we can substitute the values of I and w into the formula for rotational kinetic energy:
KE = (1/2) * I * w^2
= (1/2) * 0.3072 kg m^2 * (81.25 rad/s)^2
= 992.16 J
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Which statement is true in describing the image formed by a thin lens of an object placed in front of the lens?
a) All of the statements are correct. b) If the image is real, then it is also inverted. c) If the lens is convex, the image will never be virtual. d) If the image is real, then it is also enlarged.
The correct statement in describing the image formed by a thin lens of an object placed in front of the lens is b) If the image is real, then it is also inverted.
This is because a thin lens follows the rules of optics, which state that the image formed by a convex lens is real and inverted when the object is placed at a distance greater than the focal length of the lens. Therefore, option b is the correct statement. Option a is incorrect because not all of the statements are correct. Option c is also incorrect because a convex lens can form a virtual image when the object is placed within the focal length of the lens. Option d is also incorrect because the size of the image depends on the distance of the object from the lens and the focal length of the lens.
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A 0.410 cm diameter plastic sphere, used in a static electricity demonstration, has a uniformly distributed 55.0 pC charge on its surface. What is the potential (in V) near its surface
The potential near its surface is approximately 2.40 x 10^5 V.
To find the potential (in V) near the surface of a 0.410 cm diameter plastic sphere with a uniformly distributed 55.0 pC charge on its surface, we can use the formula for the electric potential of a uniformly charged sphere:
V = (k * Q) / R
where V is the potential, k is the electrostatic constant (8.99 x 10^9 N·m^2/C^2), Q is the charge on the sphere (55.0 pC), and R is the radius of the sphere.
First, convert the diameter of the sphere to meters and then find the radius:
Diameter = 0.410 cm = 0.00410 m
Radius (R) = Diameter / 2 = 0.00410 m / 2 = 0.00205 m
Next, convert the charge from pC to C:
Q = 55.0 pC = 55.0 x 10^-12 C
Now, we can use the formula to find the potential (V) near the surface of the sphere:
V = (8.99 x 10^9 N·m^2/C^2) * (55.0 x 10^-12 C) / 0.00205 m
V ≈ 2.40 x 10^5 V
The potential near the surface of the 0.410 cm diameter plastic sphere with a uniformly distributed 55.0 pC charge is approximately 2.40 x 10^5 V.
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A roller coaster is designed in such a way that riders feel weightless when going over the second rise (hill) after being towed up to the top of the first rise. The second rise/hill has the form of a semicircular arc with a radius 25 m. How high must the first rise be with respect to the second rise in order for the riders to feel as if they are weightless at the top of this rise
The height of the first hill must be 122.6 meters above the height of the second hill in order for the riders to feel as if they are weightless at the top of this rise
To determine the height of the first rise, we can use the principle of conservation of energy. At the top of the first rise, the potential energy of the riders is converted to kinetic energy as they travel down the slope. This kinetic energy is then converted back into potential energy as the roller coaster climbs the second hill.
At the top of the second hill, the riders will feel weightless if the normal force from the track on the riders is zero. This occurs when the apparent weight of the riders is equal to zero, which means that the gravitational force is balanced by the centrifugal force due to the circular motion of the roller coaster.
The centrifugal force on the riders at the top of the second hill can be calculated using the formula:
F_c = m * v^2 / r
where m is the mass of the riders, v is their speed at the top of the hill, and r is the radius of the hill.
Since the riders are weightless, their weight must be balanced by the centrifugal force, which means that:
m * g = m * v^2 / r
where g is the acceleration due to gravity.
Solving for v, we get:
v = sqrt(g * r)
At the top of the first hill, the riders will have some initial speed, which we can assume is zero when they are first towed up the hill. The height of the first hill can then be calculated using the conservation of energy equation:
m * g * h1 = 1/2 * m * v^2 + m * g * h2
where h1 is the height of the first hill, h2 is the height of the second hill, and we have used the fact that the initial potential energy is equal to the final potential energy plus the final kinetic energy.
Substituting in the expression for v, we get:
m * g * h1 = 1/2 * m * g * r + m * g * h2
Solving for h1, we get:
h1 = 1/2 * g * r + h2
Substituting in the given values of g = 9.81 m/s^2 and r = 25 m, we get:
h1 = 1/2 * 9.81 m/s^2 * 25 m + h2
h1 = 122.6 m + h2
Therefore, the height of the first hill must be 122.6 meters above the height of the second hill in order for the riders to feel weightless at the top of the second hill.
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What is the rate of heat flow into a system whose internal energy is increasing at the rate of 45.0 WW , given that the system is doing work at the rate of 285 WW
The rate of heat flow into the system is 330 W.
According to the first law of thermodynamics, the change in internal energy of a system is equal to the heat added to the system minus the work done by the system:
ΔU = Q - W
Where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system.
Rearranging this equation, we can find the rate of heat flow into the system:
Q = ΔU + W
The given values are:
ΔU = 45.0 W
W = 285 W
So, the rate of heat flow into the system is:
Q = ΔU + W = 45.0 W + 285 W = 330 W
Therefore, the rate of heat flow into the system is 330 W. This means that the system is receiving heat at a rate of 330 W while it is also doing work at a rate of 285 W, resulting in an increase in its internal energy at a rate of 45.0 W.
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A fisherman in a stream 39 cm deep looks downward into the water and sees a rock on the stream bed. How deep does the stream appear to the fisherman? The index of refraction of the water is 1.33. A) 29 cm B) 52 cm C) 33 cm D) 45 cm
The stream appears to be 33 cm deep to the fisherman.
To solve this problem, we can use Snell's Law, which relates the angles of incidence and refraction of light passing through two different mediums. In this case, the two mediums are air and water.
Let's assume that the fisherman is looking straight down, perpendicular to the surface of the water. The angle of incidence is therefore 0 degrees. We can use Snell's Law to find the angle of refraction:
n1 * sin(theta1) = n2 * sin(theta2)
n1 is the index of refraction of air, which is 1. n2 is the index of refraction of water, which is 1.33. Theta1 is 0 degrees, and we want to solve for theta2.
sin(theta2) = (n1/n2) * sin(theta1) = (1/1.33) * sin(0) = 0
Since sin(theta2) = 0, we know that theta2 must be 0 degrees as well. This means that the light passes straight through the water-air interface and is not refracted.
To find the apparent depth of the stream, we need to find the distance between the surface of the water and the image of the rock. Since the light passes straight through the water-air interface, the image of the rock appears to be at the same distance below the surface as it actually is below the water. The distance between the surface and the rock is therefore 39 cm. The stream appears to be 33 cm deep because that is the distance between the surface and the image of the rock.
Overall, the stream appears shallower than it actually is because of the refraction of light at the water-air interface.
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Light waves with two different wavelengths, 632 nm and 474 nm, pass simultaneously through a single slit whose width is 7.15 105 m and strike a screen 1.20 m from the slit. Two diffraction patterns are formed on the screen. What is the distance (in cm) between the common center of the diffraction patterns and the first occurrence of a dark fringe from one pattern falling on top of a dark fringe from the other pattern
The first time a dark fringe from one pattern fell on top of a dark fringe from the other, the distance between the centres of the two diffraction patterns and that initial occurrence was 4.97 cm.
We can determine the positions of the dark fringes for each wavelength by using the formula for the location of the minima in single-slit diffraction, d*sin = m, where d is the slit width, is the angle between the centre of the diffraction pattern and the minima, m is the order of the minima, and is the wavelength of light.
The first dark fringe at the 632 nm wavelength appears at sin = d/d = 8.83x10-6, or = 0.000506 radians. The first dark fringe for the 474 nm wavelength appears at sin = d/d = 6.63x10-6, or = 0.000380 radians.
Trigonometry can be used to calculate the distance between the centres of the two patterns: d = Ltan(1/2) + Ltan(2/2) where L is the distance from the slit to the screen. As we enter the values, we acquire d = 4.97 cm.
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The rotational inertia of a type of automobile tire is found to be 0.55 kg.m2. The automobile riding on these tires is traveling at 60 mph which is about 27 m/s. If this is the linear speed of points on the circumference of this tire, and if this tire has a radius of 40 cm, what is the angular velocity of this tire
The angular velocity of the tire is 67.5 radians per second.
The rotational inertia of a tire is a measure of how much torque is required to change its rotational motion. It is dependent on the mass distribution of the tire and its radius. In this case, the rotational inertia of the tire is given as 0.55 kg.m2.
To determine the angular velocity of the tire, we can use the relationship between linear velocity, angular velocity, and radius. The linear velocity of the points on the circumference of the tire is given as 27 m/s, and the radius of the tire is 40 cm or 0.4 meters. Therefore, the angular velocity can be calculated as:
angular velocity = linear velocity/radius
angular velocity = 27 m/s / 0.4 m
angular velocity = 67.5 rad/s
It's worth noting that the linear speed of the tire is proportional to its angular speed, with the radius acting as the constant of proportionality. Therefore, if the linear speed of the tire were to increase or decrease, the angular velocity would change accordingly.
Overall, the angular velocity of the tire can be calculated by dividing the linear velocity by the radius of the tire, using the formula angular velocity = linear velocity/radius. In this case, the angular velocity of the tire is 67.5 radians per second.
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By what factor must you increase the force you exert on the rope to cause the speed to increase by a factor of 1.10
To increase the speed by a factor of 1.10, you must increase the force you exert on the rope by a factor of approximately 1.21.
This is because the force required to accelerate an object is directly proportional to the acceleration of the object. Therefore, if you want to increase the speed by a factor of 1.10 (which is a 10% increase), you need to increase the acceleration by the same factor.
Since acceleration is directly proportional to force, you need to increase the force by a factor of √1.10 (which is approximately 1.05) to achieve a 10% increase in acceleration, and therefore a 10% increase in speed. However, since force and acceleration are related by mass (F=ma), you also need to take into account the mass of the object being pulled. Assuming the mass remains constant, the required increase in force would be approximately 1.21 times the original force.
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If you double the kinetic energy of a nonrelativistic particle, how does its de Broglie wavelength change? The wavelength Choose your answer here by a factor of Type your answer here [factor answer should be given to one decimal place (ex.. 1.5)]
The de Broglie wavelength of a nonrelativistic particle is inversely proportional to the square root of its kinetic energy. If the kinetic energy is doubled, the wavelength decreases by a factor of 0.71.
The de Broglie wavelength of a nonrelativistic particle is given by λ = h/p, where h is Planck's constant and p is the momentum of the particle. Since the momentum of a particle is related to its kinetic energy through the equation p = √(2mK), where m is the mass of the particle and K is its kinetic energy, we can write λ = h/√(2mK). If the kinetic energy of the particle is doubled, the wavelength will decrease by a factor of √2, or approximately 0.71. This relationship can be seen from the fact that λ is inversely proportional to the square root of the kinetic energy.
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What is the ideal banking angle for a gentle turn of 1.5-km radius on a highway with a 100 km/h speed limit, assuming everyone travels at the limit
The ideal banking angle for a gentle turn of a 1.5-km radius on a highway with a 100 km/h speed limit can be found using the formula:
θ = arctan(v^2 / (g * r))
where θ is the banking angle, v is the velocity of the car, g is the acceleration due to gravity, and r is the radius of the turn.
Plugging in the values, we get:
θ = arctan((100 km/h)^2 / (9.81 m/s^2 * 1500 m))
θ = arctan(29.22)
Using a calculator, we get:
θ = 15.5 degrees
Therefore, the ideal banking angle for a gentle turn of a 1.5-km radius on a highway with a 100 km/h speed limit is approximately 15.5 degrees.
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A grinding wheel driven by an electric motor takes 3 s to get up to its operating speed of 3600 RPM when turned on, and 75 s to stop spinning when turned off. How many revolutions does the motor make during the 3 s and 70 s startup and shutdown periods, respectively
During the startup period, the motor makes 90 revolutions, and during the shutdown period, it makes 2250 revolutions
Let's calculate the number of revolutions during the startup and shutdown periods for the grinding wheel driven by an electric motor.
Startup period:
1. Time taken to reach operating speed: 3 s
2. Operating speed: 3600 RPM (revolutions per minute)
3. Calculate the average speed during startup: (0 + 3600) / 2 = 1800 RPM
4. Convert the average speed to revolutions per second: 1800 RPM / 60 = 30 RPS
5. Calculate the number of revolutions during startup: 30 RPS × 3 s = 90 revolutions
Shutdown period:
1. Time taken to stop spinning: 75 s
2. Calculate the average speed during shutdown: (3600 + 0) / 2 = 1800 RPM
3. Convert the average speed to revolutions per second: 1800 RPM / 60 = 30 RPS
4. Calculate the number of revolutions during shutdown: 30 RPS × 75 s = 2250 revolutions
So, during the startup period, the motor makes 90 revolutions, and during the shutdown period, it makes 2250 revolutions.
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1. Calculate the centripetal force exerted on a car that rounds a radius curve on horizontal ground at . 2. Static friction prevents the car from slipping. Find the magnitude of the frictional force between the tires and the road that allows the car to round the curve without sliding off in a straight line.
The magnitude of the frictional force between the tires and the road that allows the car to round the curve without sliding off in a straight line is 2000 N.
How to calculate the centripetal force and magnitude of the frictional force?To calculate the centripetal force exerted on a car that rounds a radius curve on horizontal ground, we can use the following formula:
[tex]F = mv^2 / r[/tex]
where F is the centripetal force, m is the mass of the car, v is its velocity, and r is the radius of the curve.
Without the frictional force, the car would slide off in a straight line due to its inertia, so the frictional force must be equal in magnitude and opposite in direction to the centrifugal force, which is the force that tends to pull the car away from the center of the curve.
The maximum static frictional force that can act between the tires and the road without causing the car to slip is given by:
f = μsN
where f is the frictional force, μs is the coefficient of static friction between the tires and the road, and N is the normal force acting on the car due to the road.
Since the car is traveling on a horizontal surface, the normal force is equal in magnitude to the weight of the car, which can be calculated as:
N = mg
where g is the acceleration due to gravity.
Combining the above equations, we get:
f = μsN = μsmg
The maximum value of the frictional force that allows the car to round the curve without sliding off in a straight line is equal to the centripetal force, which can be equated to mv^2/r, as shown earlier.
Therefore, we can write:
[tex]f = mv^2 / r[/tex]
Equating this expression to the previous expression for f, we get:
[tex]mv^2 / r = μsmg[/tex]
Solving for the frictional force, we get:
[tex]f = μsmg = mv^2 / r[/tex]
[tex]f = (m/r) v^2[/tex]
Substituting the given values, we get:
[tex]f = (m/r) v^2 = (1000 kg / 50 m) (10 m/s)^2[/tex]
f = 2000 N
Therefore, the magnitude of the frictional force between the tires and the road that allows the car to round the curve without sliding off in a straight line is 2000 N.
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EVALUATE Suspension and cable-stayed bridges have cables under tension, as shown
in Figure 16. Study the figure, and select all correct statements.
a. Cables are used where the design calls for both compression and tension.
b. Vertical columns support the weight of the span through compression.
c. Vertical columns are pulled upward by tension from the cables.
d. Tension acts horizontally as well as vertically.
In suspension and cable-stayed bridges, the weight of the bridge deck is transferred to the supporting piers or towers through vertical columns . The correct statements are b and c.
These vertical columns support the weight of the bridge through compression. The cables that are attached to the pylon and to the bridge deck are under tension, which helps to distribute the weight of the bridge evenly across the vertical columns. The tension in the cables acts both horizontally and vertically, allowing the bridge to resist the bending forces that are created when loads are applied. Cables are used in suspension and cable-stayed bridges to support weight of bridge through tension, not compression. Therefore, statements b and c are correct.
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A single conservative force F = (4.0x - 12) N, where x is in meters, acts on a particle moving along an x axis. The potential energy U associated with this force is assigned a value of 26 J at x = 0. (a) What is the maximum positive potential energy? At what (b) negative value and (c) positive value of x is the potential energy equal to zero?
The potential energy is zero at x = -0.55 meters and x = 2.55 meters.
(a) The maximum positive potential energy occurs at the point where the force is zero. This happens when 4.0x - 12 = 0, which gives x = 3 meters. To find the potential energy at this point, we use U = -∫F dx, where the integral is taken from x = 0 to x = 3. Plugging in the force equation, we get U = -∫(4.0x - 12) dx = -2x^2 + 12x + C, where C is a constant of integration. Since U = 26 J at x = 0, we can solve for C to get C = 26. Therefore, the maximum positive potential energy is U = -2(3)^2 + 12(3) + 26 = 32 J.
(b) To find the negative value of x where the potential energy is zero, we set U = 0 and solve for x. Using the same equation for U as before, we get -2x^2 + 12x + 26 = 0. Solving this quadratic equation, we get x = 1 ± √6 meters. Since we want the negative value of x, we take x = 1 - √6 ≈ -0.55 meters.
(c) To find the positive value of x where the potential energy is zero, we use the same equation and solve for x again. We get x = 1 + √6 ≈ 2.55 meters. Therefore, the potential energy is zero at x = -0.55 meters and x = 2.55 meters.
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In an electric shaver, the blade moves back and forth over a distance of 2.0 mm in simple harmonic motion, with frequency 120 Hz. Find (a) the amplitude, (b) the maximum blade speed, and (c) the magnitude of the maximum blade acceleration.
Amplitude ≈ 0.001 m, Maximum blade speed ≈ 0.754 m/s, Magnitude of maximum blade acceleration ≈ 568.87 m/s².
To find the amplitude, maximum blade speed, and magnitude of the maximum blade acceleration in the given scenario of simple harmonic motion, we can use the following formulas:
(a) Amplitude (A) = (maximum displacement) / 2
(b) Maximum blade speed (v_max) = (angular frequency) * (amplitude)
(c) Magnitude of maximum blade acceleration (a_max) = (angular frequency)^2 * (amplitude)
Given:
Maximum displacement = 2.0 mm
Frequency (f) = 120 Hz
First, let's calculate the amplitude:
(a) Amplitude (A) = (maximum displacement) / 2
A = 2.0 mm / 2
A = 1.0 mm = 0.001 m
Next, we can calculate the angular frequency (ω) using the formula:
Angular frequency (ω) = 2π * (frequency)
ω = 2π * 120 Hz
ω ≈ 754.48 rad/s
Using the calculated amplitude and angular frequency, we can find the maximum blade speed:
(b) Maximum blade speed (v_max) = (angular frequency) * (amplitude)
v_max = 754.48 rad/s * 0.001 m
v_max ≈ 0.754 m/s
Finally, we can calculate the magnitude of the maximum blade acceleration:
(c) Magnitude of maximum blade acceleration (a_max) = (angular frequency)^2 * (amplitude)
a_max = (754.48 rad/s)^2 * 0.001 m
a_max ≈ 568.87 m/s²
Therefore, in the given scenario, the values are:
(a) Amplitude ≈ 0.001 m
(b) Maximum blade speed ≈ 0.754 m/s
(c) Magnitude of maximum blade acceleration ≈ 568.87 m/s².
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A metal bar of length 25 cm is placed perpendicular to a uniform magnetic field of strength 3 T. (a) Determine the induced emf between the ends of the rod when it is not moving. (b) Determine the emf when the rod is moving perpendicular to its length and magnetic field with a speed of 50 cm/s.
When the metal bar is not moving, the induced emf between the ends of the rod is zero , when the metal bar is moving perpendicular to its length and the magnetic field with a speed of 50 cm/s, the induced emf between the ends of the rod is 0.375 V.
(a) When the metal bar is stationary and perpendicular to the magnetic field, it will experience a magnetic force which will push the free electrons in the metal to one end of the bar, resulting in an accumulation of charges at either end of the bar. This separation of charges will result in an induced emf across the ends of the bar.
The induced emf is given by:
emf = Blv
where B is the magnetic field strength, l is the length of the metal bar, and v is the velocity of the metal bar perpendicular to the magnetic field.
Substituting the given values, we get:
emf = B * l * v = 3 T * 0.25 m * 0 m/s = 0 V
Therefore, when the metal bar is not moving, the induced emf between the ends of the rod is zero.
(b) When the metal bar is moving perpendicular to its length and the magnetic field with a speed of 50 cm/s, it will experience an induced emf due to the relative motion between the bar and the magnetic field.
The induced emf is given by:
emf = Blv
Substituting the given values, we get:
emf = B * l * v = 3 T * 0.25 m * 0.5 m/s = 0.375 V
Therefore, when the metal bar is moving perpendicular to its length and the magnetic field with a speed of 50 cm/s, the induced emf between the ends of the rod is 0.375 V.
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What is the smallest allowable magnitude for the orbital angular momentum ( L ) in the quantum model
This means that for the s orbital, the magnitude of the orbital angular momentum is zero and there is no angular momentum associated with the electron's motion.
In the quantum model, the magnitude of the orbital angular momentum (L) is quantized and can only take on certain discrete values given by:
L = ħ √(l(l+1))
where ħ is the reduced Planck constant (ħ = h/(2π)), l is the orbital quantum number, and √(l(l+1)) is known as the magnitude of the orbital angular momentum quantum number.
The allowed values of l depend on the principal quantum number n, and can range from 0 to n-1. Therefore, the smallest possible value of l is 0, corresponding to the s orbital.
Substituting l = 0 into the equation above, we get:
L = ħ √(0(0+1)) = 0
Hence, This means that for the s orbital, the magnitude of the orbital angular momentum is zero and there is no angular momentum associated with the electron's motion.
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The smallest allowable magnitude for the orbital angular momentum (L) in the quantum model is 0.
The smallest allowable magnitude for the orbital angular momentum (L) in the quantum model can be determined using the quantum number "l" and the relationship between L and l. In quantum mechanics, the orbital angular momentum is quantized, meaning it can only have discrete values.
The quantum number l, also known as the azimuthal quantum number, defines the shape of an electron's orbital and has integer values starting from 0 to (n-1), where n is the principal quantum number. The value of l is directly related to the orbital angular momentum.
The magnitude of the orbital angular momentum L can be calculated using the formula:
L = √(l*(l+1)) * ħ
where ħ is the reduced Planck constant.
For the smallest allowable magnitude of L, the value of l should be the lowest possible, which is l = 0. Plugging this into the formula, we get:
L = √(0*(0+1)) * ħ = 0
So, the smallest allowable magnitude for the orbital angular momentum (L) in the quantum model is 0. When l=0, the electron is in an s-orbital, which has a spherical shape. The fact that L can have a zero magnitude is a unique feature of quantum mechanics, and it highlights the quantized nature of orbital angular momentum in the quantum model.
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A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 82.1 kg water-skier has an intial speed of 5.8 m/s. Later, the speed increases to 11.8 m/s. Determine the work done by the net external force acting on the skier.
The amount of work done by the net external force on the water-skier is approximately 4,314.48 joules.
What is the work done by the net external force acting on the water-skier if their initial speed is 5.8 m/s and their final speed is 11.8 m/s, given that they have a mass of 82.1 kg?To determine the work done by the net external force acting on the skier, we can use the work-energy principle:
Net work done on the skier = change in kinetic energy of the skier
The change in kinetic energy is:
ΔK = 1/2 * m * (vf² - vi²)
where m is the mass of the skier, vi is the initial velocity, and vf is the final velocity.
Substituting the given values:
ΔK = 1/2 * 82.1 kg * (11.8 m/s)² - 1/2 * 82.1 kg * (5.8 m/s)²ΔK = 1/2 * 82.1 kg * (139.24 m²/s² - 33.64 m²/s²)ΔK = 1/2 * 82.1 kg * 105.6 m²/s²ΔK = 4,314.48 JTherefore, the net work done on the skier is 4,314.48 J.
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The resonance frequency of a series RLC circuit is 6000 Hz . Part A What is the resonance frequency if the resistance R is doubled?
The resonance frequency of a series RLC circuit is inversely proportional to the square root, the inductance L and the capacitance C. So, doubling the resistance R of the circuit will: not change the resonance frequency.
The resonance frequency of a series RLC circuit is given by the formula f_res = 1 / (2π √(LC)), where L is the inductance, C is the capacitance, and π is pi. This formula shows that the resonance frequency is determined by the product of the inductance and the capacitance, and is independent of the resistance.
When the resistance R of the circuit is doubled, the impedance of the circuit will increase, which will cause a reduction in the current flowing through the circuit.
However, the resonance frequency will remain the same, since it is determined only by the inductance and capacitance of the circuit. Therefore, if the resonance frequency was 6000 Hz before doubling the resistance, it will still be 6000 Hz after doubling the resistance.
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Complete question:
The resonance frequency of a series RLC circuit is 3000 Hz .
What is the resonance frequency if the resistance R is doubled?
The coherence length of an ordinary white light source can be increased if we place a color filter in front of the source, so that the light that passes through the filter is somewhat monochromatic. The minimum wavelength of the emerging light is 540 nm. What is the maximum wavelength in order for the coherence length to be 0.1140 mm
the maximum wavelength in order for the coherence length to be 0.1140 mm is approximately 541.29 nm.
What is wavelength?Wavelength is the distance between two successive peaks or troughs of a wave, such as a light wave or a sound wave.
What is coherence length?Coherence length is the distance over which a wave maintains a consistent phase relationship, often used to describe laser light.
According to the given information:
To find the maximum wavelength for a coherence length of 0.1140 mm, we can use the formula:
Coherence length (L) = λ² / (2 * Δλ)
where λ is the minimum wavelength (540 nm) and Δλ is the difference between the maximum and minimum wavelengths. We need to solve for the maximum wavelength (λ_max).
First, we rearrange the formula to find Δλ:
Δλ = λ² / (2 * L)
Now, plug in the given values (convert 0.1140 mm to nm: 0.1140 * 10^6 = 114000 nm):
Δλ = (540 nm)² / (2 * 114000 nm)
Δλ ≈ 1.29 nm
Finally, we add Δλ to the minimum wavelength to find the maximum wavelength:
λ_max = 540 nm + 1.29 nm
λ_max ≈ 541.29 nm
Therefore, the maximum wavelength in order for the coherence length to be 0.1140 mm is approximately 541.29 nm.
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Radio-controlled clocks throughout the United States receive a radio signal from a transmitter in Fort Collins, Colorado, that accurately (within a microsecond) marks the beginning of each minute. A slight delay, however, is introduced because this signal must travel from the transmitter to the clocks. Part A Assuming Fort Collins is no more than 3000 kmkm from any point in the U.S., what is the longest travel-time delay
This means that the longest travel-time delay for the radio signal to reach the radio-controlled clocks throughout the US is approximately 0.01 seconds or 10 microseconds
The speed of light is approximately 299,792,458 meters per second, which is the speed at which the radio signal travels from Fort Collins to the radio-controlled clocks throughout the United States. Assuming Fort Collins is no more than 3000 km from any point in the US, we can calculate the maximum delay time by using the formula:
Delay time = distance ÷ speed of light
Converting km to meters, we get:
3000 km = 3,000,000 meters
Therefore, the maximum delay time is:
Delay time = 3,000,000 meters ÷ 299,792,458 meters per second
Delay time = 0.01 seconds
Although this delay is very small, it is significant enough to affect the accuracy of the clocks if not accounted for.Radio-controlled clocks use special receivers that adjust the time according to the delay introduced by the radio signal.
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