The true statements about the periodic review model are:
b. in a periodic review model, the quantity ordered in each review varies
d. it establishes a fixed or interval
About periodic review systemA periodic review system allows you to determine the quantity of items you have in stock at specified regular intervals, such as every Friday or the last day of the month. Similar to the Minimax system, we order the quantity (Q) that is the target stock (TI) minus the quantity on hand (OH).
The difference is that in a periodic review system, the time between orders is constant (hourly, daily, weekly, monthly, etc.) and the order quantity varies. A min-max system varies both the time between orders and the order quantity.
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A constant horizontal force F is applied to a garden roller in the form of a uniform solid cylinder of radius R and mass M. If the roller rolls without sliding on the horizontal surface, show that (a) the acceleration of the center of mass is 2F / 3M and (b) the minimum coefficient of friction necessary to avoid slip is F / 3Mg. (Hint: take the moment regarding the center of mass).
(a) The acceleration of the center of mass is 2F / 3M.
(b) The minimum coefficient of friction necessary to avoid slip is F / 3Mg.
What is the center of mass?The amount of matter that is contained in a substance or object is measured by its mass, which is a physical attribute of matter. Although the two are different amounts, they are frequently mistaken for weight. A recognized reference, such as a standard mass, can be used to compare an object's mass, which is expressed in kilograms (kg) or grams (g). Because the center of mass is an inherent quality of an object, it is unaffected by location or gravitational influence. A key component of explaining the behavior of moving objects, as well as the characteristics of materials and the dynamics of the cosmos, is the concept of mass, which is basic to physics.
(a) Taking moments about the center of mass, we have:
F(R/2) - f(R/2) = 0
Simplifying, we get: f = F
Therefore, the acceleration of the center of mass can be found using the equation: F - f = Ma
where M is the mass of the roller, and a is the acceleration of the center of mass.
Substituting f = F, we get: F - F = Ma
Simplifying, we get: a = 2F/3M
Therefore, the acceleration of the center of mass is 2F/3M.
(b) To avoid slipping, the frictional force f must be greater than or equal to the force required to cause slipping, which is given by:
Fs = μsN
where μs is the coefficient of static friction, and N is the normal force.
The normal force is equal to the weight of the roller, which is Mg, where g is the acceleration due to gravity.
Substituting f = F and N = Mg, we get:
F ≥ μsMg
Dividing both sides by 3M, we get:
F/3M ≥ μs g
Therefore, the minimum coefficient of friction required to avoid slipping is F/3Mg.
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What is (Fnet3)X ( the x-component of the net force exerted by these two charges) on a third charge q3 = 51.0 nC placed between q1 and q2 at X3 = -1.195 m ?
We can use Coulomb's law to calculate the net force on q3 due to q1 and q2, and then take the x-component of that net force.
The force on q3 due to q1 is given by:
What is coulomb's law?F1 = k * (q1 * q3) / r1^2
where k is Coulomb's constant, q1 is the charge on q1, q3 is the charge on q3, and r1 is the distance between q1 and q3.
Similarly, the force on q3 due to q2 is given by:
F2 = k * (q2 * q3) / r2^2
where q2 is the charge on q2, and r2 is the distance between q2 and q3.
The net force on q3 is the vector sum of F1 and F2:
Fnet3 = F1 + F2
To find the x-component of Fnet3, we need to multiply the magnitude of Fnet3 by the cosine of the angle between Fnet3 and the x-axis. Since we are only interested in the x-component, we can use the x-components of F1 and F2:Fnet3,x = F1,x + F2,x
= (F1 * cos(theta1)) + (F2 * cos(theta2))
where theta1 is the angle between F1 and the x-axis, and theta2 is the angle between F2 and the x-axis.
The distances r1 and r2 can be calculated using the distance formula:
r1 = sqrt((X3 - X1)^2 + Y1^2)
r2 = sqrt((X3 - X2)^2 + Y2^2)
where X1 and X2 are the x-coordinates of q1 and q2, Y1 and Y2 are their y-coordinates, and X3 is the x-coordinate of q3.
Plugging in the given values, we get:
r1 = sqrt((-1.195 m - 0.250 m)^2 + 0^2) = 0.945 m
r2 = sqrt((-1.195 m + 0.250 m)^2 + 0^2) = 1.195 m
And we can use the x-component of the unit vector in the x-direction to get the cosine terms:cos(theta1) = 1/sqrt(2)
cos(theta2) = -1/sqrt(2)
Plugging in all the values, we get:F1 = (9.0 x 10^9 Nm^2/C^2) * (-2.40 nC * 51.0 nC) / (0.945 m)^2 = -2.275 x 10^-4 N
F2 = (9.0 x 10^9 Nm^2/C^2) * (3.60 nC * 51.0 nC) / (1.195 m)^2 = 1.482 x 10^-4 N
Fnet3,x = (F1 * cos(theta1)) + (F2 * cos(theta2))
= (-2.275 x 10^-4 N * 1/sqrt(2)) + (1.482 x 10^-4 N * -1/sqrt(2))
= -3.98 x 10^-5 N
Therefore, the x-component of the net force on q3 is -3.98 x 10^-5 N.
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In a classroom demonstration the pressure inside a soft drink can is suddenly reduced to essentially zero. Assuming the can to be a cylinder with a height of 15 cm
and a diameter of 7.0 cm
, find the total inward force exerted on the vertical sides of the can due to atmospheric pressure.
The total inward force exerted on the vertical sides of the can due to atmospheric pressure is calculated as 4053 N.
What is pressure?Pressure may be defined as the amount of force that is correspondingly applied perpendicular to the surface of an object per unit area. The symbol for it is "p" or P. It is generally calculated with the help of the formula, pressure, P = F/A.
According to the question,
The atmospheric pressure acts on the outer surface of the can. In order to calculate this inward force we need to know the total surface area of the can available to the air outside the can. Since the can is a cylinder with a total surface area given by 2πrh + 2πr².
A = 2πr(r + h)
where h = height of the cylinder = 15cm.
r = radius of the can = 7 cm/2 = 3.50 cm. (as r = diameter /2)
A = 2π×3.50 ×(3.50 + 15) = 406.6 cm² = 406.6 × 10-⁴ = 0.040m².
Atmospheric pressure, P = 101325Pa = 101325 N/m²
F = P × A
F = 101325 × 0.040 = 4053 N.
Therefore, the total inward force exerted on the vertical sides of the can due to atmospheric pressure is calculated as 4053 N.
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You are climbing in the High Sierra where you suddenly find yourself at the edge of a fog-shrouded cliff. To find the height of this cliff, you drop a rock from the top and 9.30s later hear the sound of it hitting the ground at the foot of the cliff.
Part A
Ignoring air resistance, how high is the cliff if the speed of sound is 330 m/s?
Express your answer with the appropriate units.
h =
The height of the cliff when the time taken to hear the sound is given is calculated to be 316.98 m.
Let us assume the height of the cliff to be h.
t is the time taken by the stone to reach the ground
Time taken to hear the sound is 9.3 s.
Time taken by the sound to reach the height of the cliff = 9.3 - t
Speed of sound in air is given as = 330 m/s
For the stone falling, the height is given by,
h = u t + 1/2 g t²
h = (0)t + 1/2 (9.81) t² = 4.905 t²
The distance travelled by the sound is,
d = s t
where,
s is speed
t is time
d = s t = 330 × (9.3 - t)
As the distance travelled by the stone and sound are equal,
4.905 t² = 330 × (9.3 - t)
4.905 t² = 3069 - 330t
4.905 t² + 330 t - 3069 = 0
The values of t are, t = 8.039, -75.318
As time cannot be negative, t = 8.039 s
The height of the cliff, h = 4.905 t² = 4.905(8.039)² = 316.98 m
Thus, the height of the cliff is calculated to be 316.98 m.
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How far up the ladder can bob climb before it slips at the bottom
Bob can climb 2.68 m up the ladder before he slips.
How far up the ladder can bob climb?Assume that the system is in equilibrium when the person is at the highest point L meters from the top of the ladder (measured along the ladder).
The force of friction:
f = μFn
The resultant normal force on the person;
N = μFn = μ (F + W)
The torque around the lower end of the ladder;
Wcosθ(L/2) + Fcosθ(L - x) - NLsinθ = 0
Substitute the value of the value of the normal force
Wcosθ(L/2) + Fcosθ(L - x) - μ (F + W)Lsinθ = 0
where;
W is the weight of Bob = 80 kg x 9.8 m/s² = 784 NF is the weight of the ladder = 20 kg x 9.8 m/s² = 196 Nθ is the inclination of the ladderL is the length of the ladder = 10 m784 cos(60)( 10/2) + 196 cos(60)(10 - x) - 0.2(196 + 784) x 10 x sin(60) = 0
1960 + 980 - 98x - 1,697.36 = 0
1,242.64 - 98x = 0
98x = 1,242.64
x = 1,242.64/98
x = 12.68
12.68 m - 10 m = 2.68 m
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Express the magnitude of the electric force using the electric field E and the elementary charge e. FE = _____
E=Fqtest=k|Q|r2. The size of the electric field produced by a point charge Q is determined by this equation. The distance r in the denominator is the separation between the point of interest and the point charge, Q, or the center of a spherical charge.
What determines how much electric force a charged particle experiences in an electric field?
It is obvious from the equation above that the strength of the electric force a charged particle experiences in an electric field depends on the size of the charge on the particle.
What are the electric field's strength and direction?
A positive point charge is pointed straight away by the electric field, and a negative point charge is pointed directly in. Going away from the point charge, the electric field's strength diminishes as 1 / r 2 1/r21, slash, r, squared.
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If the vector below is multiplied by 2, what will be its end point?
A. (-2,2)
B. (-2,1)
C. (-1,2)
D. (2,2)
The endpoint of the vector after the multiplication of 2 will be (2,2). The correct option is D.
What is a vector?In physics, a vector is a quantity that has both magnitude and direction. It is typically represented by an arrow with the same direction as the quantity and a length proportional to the magnitude of the quantity.
Given that the vector is multiplied by the 2. The endpoint of the vector after the multiplication of 2 will be calculated as:-
The endpoint of the vector in the image is ( 1, 1 ).
Endpoint = ( 1, 1 ) x 2
Endpoint = ( 2, 2 )
Therefore, the vector's endpoint after multiplication by two will be (2,2). The correct answer is D.
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A boat travels 12km in 10mins, and 15km in the next 10mins. Is the boat traveling at a constant speed?
The boat is not traveling at a constant speed. The boat is either accelerating or decelerating during the two intervals.
How to determine if the boat is traveling at a constant speed?First we need to compare the distance traveled with the time taken.
For the first 10 minutes, the boat travels 12 km. Therefore, its speed can be calculated as:
Speed = Distance / Time = 12 km / 10 min = 1.2 km/min
For the next 10 minutes, the boat travels 15 km. Therefore, its speed can be calculated as:
Speed = Distance / Time = 15 km / 10 min = 1.5 km/min
Therefore, Since the speeds calculated for the two intervals are different, the boat is not traveling at a constant speed. The boat is either accelerating or decelerating during the two intervals.
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A frictional force f provides the centripetal force as a car goes around an unbanked curve of radius R at speed V . Later, the car encounters a similar curve, except of radius 0.5 R , and the driver continues around this curve at the same speed V . In order to make this second curve, the frictional force on the car must be equal to In order to make this second curve, the frictional force on the car must be equal to . a. 1/4 f b. 2 f c. 0.5 f d. f
To produce the second curve, two times as much frictional force is needed as to make the first curve. It is best to choose option B.
The centripetal force required to keep a car moving in a circle of radius R at speed V is given by:
F = mv²/R
where m is the mass of the car.
In the first case, the frictional force f provides this centripetal force, so we have:
f = mv²/R
In the second case, the radius of the curve is 0.5 R, so the centripetal force required to keep the car moving at the same speed V is:
F' = mv²/(0.5R) = 2mv²/R
In order to make the second curve, the frictional force on the car must be equal to:
f' = F' = 2mv²/R
So the frictional force required is two times of force required to make the first curve.
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A 14.9 kg mass attached to a spring scale rests on a smooth, horizontal surface. The spring scale, attached to the front end of a boxcar, reads T = 50 N when the car is in motion. If the spring scale reads zero when the car is at rest, determine the acceleration of the car, when it is in motion as indicated above. Answer in units of m/s 2 .
What would be the reading on the scale if the boxcar were moving at a constant velocity?
1. T
2. There is not enough information given to tell which is correct.
3. less than T, but greater than 0 N
4. 0 N
5. greater than T
Constant velocity refers to the motion of an object that moves in a straight line with a constant speed, i.e., it covers equal distances in equal intervals of time.
Velocity is a vector quantity that has both magnitude (speed) and direction. So, an object moving with a constant velocity must maintain a constant speed and move in a straight line without changing its direction.
An example of an object moving with a constant velocity is a car driving on a long straight road without accelerating or changing its direction. Another example is a ball thrown horizontally with a constant speed, assuming air resistance is negligible.
An object with changing velocity is said to be accelerating, either by changing speed or direction. This means that an object moving with constant velocity has no net force acting upon it, as according to Newton's First Law of Motion, an object in motion will remain in motion with a constant velocity unless acted upon by a net force.
The reading on the spring scale when the boxcar is in motion indicates the tension force in the spring scale, which is equal to the net force acting on the attached mass. In this case, the only force acting on the mass is the tension force in the spring scale, since the mass rests on a smooth, horizontal surface and there is no other external force acting on it. Therefore,
[tex]T = m*a[/tex]
where T is the tension force, m is the mass, and a is the acceleration of the boxcar.
Substituting the given values,
[tex]50 N = (14.9 kg)*a[/tex]
Solving for a
[tex]a = 3.36 m/s^2[/tex]
Therefore, the acceleration of the boxcar when it is in motion is [tex]3.36 m/s^2[/tex].
When the boxcar is moving at a constant velocity, the acceleration is zero, which means the net force on the attached mass is also zero. Therefore, the reading on the spring scale would be zero in this case. So, the correct answer is 0 N.
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Match each type of energy with the correct definition.
Instructions
Chemical energy
Electrostatic energy
Thermal energy
Kinetic energy
Potential energy
- Energy associated with the random motion of atoms and molecules
- Energy stored in the structure of a compound
- Energy resulting from the interaction of charged particles
Chemical energy - Energy stored in the structure of a compound.
Electrostatic energy - Energy resulting from the interaction of charged particles.
Thermal energy - Energy associated with the random motion of atoms and molecules
Kinetic energy - Energy associated with the movement of an object.
Potential energy - Energy stored in an object due to its position are the definitions for various types of energy.
What is Thermal energy?Thermal energy (also known as heat energy) is the energy generated by the movement of molecules in a substance. This energy is released when the molecules of a substance vibrate, move, and interact.
Examples of thermal energy include the heat generated from a campfire, the warmth of the sun, and the heat produced by an electric heater.
Types of thermal energy include:
1. Radiant energy: This type of thermal energy is created by the sun and other heat sources that emit electromagnetic radiation and is transferred through space.
2. Conduction energy: This type of thermal energy is created when two objects that have different temperatures come into contact, and heat is transferred from the hotter object to the cooler object.
3. Convection energy: This type of thermal energy is created when hot air rises and cold air falls, causing movement of the air and heat transfer.
4. Adiabatic energy: This type of thermal energy is created when a gas or liquid is compressed or expanded, and heat is transferred as a result of the change in pressure.
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calculate the work wbc done by the electrostatic force on the charged particle as it moves from b to c.
The work done by the electrostatic force on a particle of charge q is calculated by the equation W = qE·(b-a)
The work performed by the electrostatic force on a particle with charge q can be calculated using the formula W = qE(b-a), where q is the particle's charge, E is the electric field, and a and b are the particle's starting and stopping positions.
This equation states that the work done by the electrostatic force is equal to the product of the particle charge, the electric field, and the separation between the beginning and finishing sites. This equation can be used to calculate the amount of work an electrostatic force performs on a particle, which is a fundamental concept in electrostatics.
For the equation to be valid, the electric field must be constant along the distance between points a and b. If the electric field changes, the work is calculated by integrating the equation across the entire period of the particle's motion.
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What is the wavelength of light in which a photon has energy 600 eV?
Answer:
The energy of a photon (E) is related to its wavelength (λ) through the equation E = hc/λ, where h is Planck's constant and c is the speed of light.
To find the wavelength of light with a photon energy of 600 eV, we can rearrange the equation to solve for λ:
λ = hc/E
Plugging in the values of h, c, and E in electron volts (1 eV = 1.602 x 10^-19 J), we get:
λ = (6.626 x 10^-34 J s) x (2.998 x 10^8 m/s) / (600 x 1.602 x 10^-19 J)
Simplifying, we get:
λ ≈ 2.06 x 10^-9 m or 2.06 nm
Therefore, the wavelength of light in which a photon has energy 600 eV is approximately 2.06 nm.
Answer:20.6 nm!!
Explanation:
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Two charged soap bubbles, bubble 1 and bubble 2, are deprecated by some distance r. Bubble 2 has 8 times the charge of bubble 1. Bubble 2 exerts a force of F1-2 on bubble 2, and bubble 2 exerts a force of F2-1 on bubble 2. How does the magnitude of F1-2 compare to F2-1?
A - It’s magnitude is 8 times as large
B - The two forces have the same magnitude
C - it’s magnitude is 64 times as large
D - it’s magnitude is 1/8 as large
Considering the information from bubble 1 and bubble 2, the magnitude of F1-2 compares to F2-1 because the two forces have the same magnitude. Option B is correct.
Why do the two forces have the same magnitude?This concept can be explained by physics through Coulomb's Law, which states that the electrostatic interaction between two particles occurs the greater the magnitude of the charges and the smaller the distance between the particles, the greater the force of attraction or repulsion between the charges.
Therefore, through Coulomb's Law we can understand the interaction between charged particles and the forces exerted by them that will be equal in magnitude and opposite in direction, making the magnitude of F1-2 equal to the force F2-1.
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fill in the blank. the phenomenon of perceptual set underscores the contribution of___processes to perception. please choose the correct answer from the following choices, and then select the submit answer button. answer choices bottom-up top-down sensory innate
The phenomenon of perceptual set underscores the contribution of top-down processes to perception.
Phenomenon of perceptual set highlights the important role of top-down processing in perception, as it shows how our past experiences, expectations, and preconceptions can shape and bias our interpretation of incoming sensory information. Perceptual set is a classic example of top-down processing, as our prior knowledge and expectations about the world can shape how we perceive incoming sensory information. For instance, if we see a group of objects arranged in a particular way, we may perceive them as a familiar shape or pattern even if they are actually different objects.
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A cylinder of linearly elastic material is fixed at its base to a rigid support and connected to a roller mechanism on its top surface as shown. Determine the horizontal deflection at the top of the cylinder from the applied load: d = 18.0 in h = 20.0 in F = 8,000 lb G = 1.00 ksi
At the top of the cylinder, there is a 0.5513-inch horizontal deflection.
To solve for the horizontal deflection at the top of the cylinder,
d = (FL^3)/(3E*I)
where, d = deflection at the end of the beam
F = concentrated load
L = length of the beam
E = modulus of elasticity
I = moment of inertia
D = diameter of the cylinder (D = 2*h = 40 in)
Moment of inertia is,
I = (pi/4)*D^4
I = (pi/4)*D^4 = 62,831.8537 in^4
Length of beam is,
[tex]L = \sqrt{d^2 + h^2}\\\\ = \sqrt{(18)^2 + (20)^2}\\\\ = 27.3861 in[/tex]
Horizontal deflection,
[tex]d = \dfrac{FL^3}{3EI}\\ = \dfrac{8000 \times 27.3861^3}{3\times (1.00)\times 62,831.8537}\\\\ = 0.5513[/tex]
Therefore, the horizontal deflection at the top of the cylinder is approximately 0.5513 inches.
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A truck with a mass of 2725 kg is being towed by a rope held at a 23degree angle from the horizontal. A fiction force of 375N opposes the cars motion. If the truck accelerates fro 2.2m/s to 10. 2 m/s in 11 s. What is the tension in the tow rope?
The tension in the tow rope is 2524 N.
Tension calculation explained.To solve this problem, we need to use Newton's second law: F = ma, where F is the net force acting on the truck, m is the mass of the truck, and a is the acceleration of the truck.
We can break down the forces acting on the truck into horizontal and vertical components. The tension in the tow rope provides the horizontal force, while the weight of the truck provides the vertical force.
The weight of the truck can be calculated as:
w = mg = (2725 kg)(9.8 m/s^2) = 26735 N
The vertical component of the tension force is equal in magnitude to the weight of the truck:
T sin 23 = w
T = w / sin 23 = 26735 N / sin 23 = 111208 N
The friction force acting against the motion of the truck is:
Ff = 375 N
The horizontal component of the tension force is responsible for accelerating the truck:
T cos 23 - Ff = ma
where a = (vf - vi) / t = (10.2 m/s - 2.2 m/s) / 11 s = 0.727 m/s^2
Substituting the known values, we get:
T cos 23 - 375 N = (2725 kg)(0.727 m/s^2)
T cos 23 = 1981 N + 375 N
T cos 23 = 2356 N
T = 2356 N / cos 23 = 2524 N
Therefore, the tension in the tow rope is approximately 2524 N using newton second law of motion.
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A simple pendulum, consists of an object suspended by a string. The object is assumed to be a particle. The string, with its top end fixed, has negligible mass and does not stretch. In the absence of air friction, the system oscillates by swinging back and forth in a vertical plane. If the string is 2.45
m
long and makes an initial angle of 26.0
∘
with the vertical, calculate the speed of the particle at the following positions.
(a) at the lowest point in its trajectory.
(b) when the angle is 15.0
∘
.
The angular speed of the pendulum is √7 rad/s.
We need to know about pendulum experiments to solve this problem. The pendulum is a simple experiment to calculate gravitational acceleration. The gravitational acceleration can be calculated by
g = 4π² . L / T²
where g is gravitational acceleration, L is the length of the string and T is the period.
From the question above, we know that:
L = 1.40 m
g = 9.8 m/s²
θmax = 31°
m = m
Find the period of pendulum
g = 4π² . L / T²
9.8 = 4π² . 1.4 / T²
T² = 4π²/7
T = 2π√7 / 7 s
Find the angular speed
ώ = 2π / T
ώ = 2π / (2π√7 / 7)
ώ = √7 rad/s.
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2. A photon with an energy of 1.64x10-13 J has just enough energy to create an electron-positron pair. What is the rest mass of the electron?
The rest mass of the electron would be 1.82x10^-30 kg.
Rest mass calculationThe rest mass of the electron can be calculated using the formula:
E = mc^2
where E is the energy of the photon, m is the rest mass of the electron, and c is the speed of light.
Rearranging the formula, we get:
m = E/c^2
Substituting the given values, we get:
m = (1.64x10^-13 J) / (3x10^8 m/s)^2
m = 1.82x10^-30 kg
Therefore, the rest mass of the electron is 1.82x10^-30 kg.
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A free electron is suspended in an electric field near the surface of the Earth.a. Give an expression for the magnitude of this electric field assuming the electron is stationary, in terms of the mass me� and charge e of the electron, and the gravitational acceleration g.b. What is the magnitude of this electric field, in N/C, assuming the electron is stationary?c. What does the small value for this field imply regarding the relative strength of the gravitational and electrostatic interaction?
a. The expression for magnitude of this electric field assuming the electron is stationary, in terms of the mass me, charge e of the electron, and the gravitational acceleration g is E = m g/q.
b. Magnitude of electric field is calculated to be 5.59 × 10⁻¹¹ N/C.
c. The small value for this field implies that the gravitational and electrostatic interaction are relatively weak.
a. We know that, Fe = Fg
where,
Fe is electrostatic force
Fg is gravitational force
Fe = Fg
q E = m g
where,
q is charge
m is mass
E is electric field
g is gravity
So, the expression of electric field is E = m g/q
b. E = m g/q = (9.11× 10⁻³¹)(9.81)/(1.6 × 10⁻¹⁹) = 55.86 × 10⁻¹² N/C
c. The small value of electric field indicates that the force is relatively very weak between the gravitational and electrostatic interactions.
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the current in bass lake has a speed of 2km/h. charle can paddle their canoe 24 km upstream and 24 km back in the same number of hrs as they can paddle 50 km what is charlie's eped in the stil water
According to the solving Charlie's speed in still water is 5 km/h.
What is relative velocity ?
Relative velocity is the velocity of an object or an observer in relation to another object or observer. It is the difference between the velocities of the two objects, as measured from a common frame of reference.
The concept of relative velocity is important in many areas of physics, including mechanics, astrophysics, and relativity theory. It allows us to understand how objects are moving relative to each other and to analyze their motion from different reference frames.
According to the given information:Let's assume that the speed of Charlie's canoe in still water is "v" km/h. Then, if Charlie paddles upstream against the current, the effective speed of the canoe will be:
v - 2 km/h
Likewise, if Charlie paddles downstream with the current, the effective speed of the canoe will be:
v + 2 km/h
We can use the formula:
time = distance / speed
to set up an equation that relates the time it takes for Charlie to paddle 24 km upstream and 24 km back with the time it takes to paddle 50 km. Since the times are the same, we can write:
24 / (v - 2) + 24 / (v + 2) = 50 / v
Multiplying both sides by the LCD (v - 2)(v + 2) yields:
24(v + 2) + 24(v - 2) = 50(v - 2)(v + 2) / v
Simplifying and rearranging, we get:
48v = 200v - 200
Solving for v, we find:
v = 5 km/h
Hence, Charlie's speed in still water is 5 km/h.
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Was Pons and Fleischmann’s work an example of “good” science? Using the evidence from above, explain your answer, citing the text.
Pons and Fleischmann's work on cold fusion was controversial, and there is no clear consensus on whether it can be considered "good" science.
On one hand, their findings were not replicable, and the scientific community was skeptical of their claims. Additionally, they announced their discovery before it had been peer-reviewed or subjected to further testing, which violated established scientific protocols.However, some argue that their work was an important step in exploring the possibility of cold fusion and should not be dismissed outright. They did conduct experiments and make observations, and their work sparked further research into the phenomenon. Ultimately, whether their work was "good" science may depend on one's perspective and criteria for evaluating scientific research.To know more about science visit:
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Every star is part of a constellation and is assigned a Greek letter within the constellation. Many stars still bear ancient Arabic names. Based on how astronomers refer to stars, select all of the correct statements from the following list.
-The star in a constellation is usually brighter than the B star.
-All stars are part of some constellation.
-A star with an ancient Arabic name is probably relatively bright.
Based on the astronomers definition of stars, All stars are part of some constellation. Only the statement II is correct.
All stars visible from Earth are part of a constellation, which is a region of the sky defined by the International Astronomical Union (IAU). The IAU has divided the sky into 88 official constellations, each with its own boundaries and set of stars. Astronomers use the constellations as a way to locate and identify stars and other celestial objects in the night sky.
The brightness of a star is not necessarily related to its position or designation within a constellation, so the first statement is not correct. Also, the presence or absence of an Arabic name is not an indication of a star's brightness, so the third statement is not correct.
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--The complete question is, Every star is part of a constellation and is assigned a Greek letter within the constellation. Many stars still bear ancient Arabic names. Based on how astronomers refer to stars, select all of the correct statements from the following list.
I The star in a constellation is usually brighter than the B star.
II All stars are part of some constellation.
III A star with an ancient Arabic name is probably relatively bright.--
looking at error instrumental error the actual value of the mass of the object, called a calibration mass, is 250.0 g. below, calculate the difference of each measurement from the actual value. use negative symbols if the measured mass is less than the actual mass. is there any pattern to the difference? yes no difference from actual value balance 2 253.135 g 253.131 g 253.133 g 253.130 g 253.132 g 253.130 g 253.131 g 253.136 g 253.133 g 253.134 g
To calculate the difference between each measurement and the actual value of 250.0 g, we subtract 250.0 g from each measured value. The results are:
How to calculate actual value ?Balance 2:
253.135 g - 250.0 g = +3.135 g
253.131 g - 250.0 g = +3.131 g
253.133 g - 250.0 g = +3.133 g
253.130 g - 250.0 g = +3.130 g
253.132 g - 250.0 g = +3.132 g
253.130 g - 250.0 g = +3.130 g
253.131 g - 250.0 g = +3.131 g
253.136 g - 250.0 g = +3.136 g
253.133 g - 250.0 g = +3.133 g
253.134 g - 250.0 g = +3.134 g
As we can see, all the differences are positive, which means that all the measured values are greater than the actual value. There does not seem to be a clear pattern to the differences, but they are all relatively small, with a maximum difference of 3.136 g. This suggests that the balance is fairly accurate, but it may be possible to improve the precision by taking more measurements and averaging the results.To know more about actual value , check out :
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If the vector below is multiplied by 2, what will be its end point?
A. (-2,2)
B. (-2,1)
C. (-1,2)
D. (2,2)
If the vector below is multiplied by 2, option D will be its end point
How did we get the value?If a vector is multiplied by 2, its end point will be scaled up by a factor of 2. So, if the original vector has end point (x,y), its end point after being multiplied by 2 will be (2x, 2y).
Given the vector below, its end point is (1,1):
^
|
|
|
|
---+--->
After being multiplied by 2, the end point of the vector will be (2 * 1, 2 * 1) = (2, 2), which corresponds to answer choice (D).
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A cube of mass 1=8.1 kg is sitting on top of a second cube of the same size and mass 2=0.5 kg while both are in free fall. Ignoring any air resistance, what is the magnitude of the normal force with which the bottom cube is acting on the top cube?
The magnitude of the normal force is 8.1 kg + 0.5 kg = 8.6 kg.
What is force ?Force is an action that is capable of changing an object's state of motion or causing a physical change. It is a vector quantity, meaning it has both magnitude and direction. Force is measured in units of mass multiplied by acceleration, or newtons (N). Force can cause an object to accelerate, decelerate, change direction, or stay in the same state. In Newtonian mechanics, force is simply the product of mass and acceleration. Force can also be generated through the transfer of energy, such as when a motor transfers energy to a wheel. In addition to causing physical changes, force can also cause changes in the environment, such as when wind causes the leaves of a tree to move. Force is an essential part of any physical interaction, and its effects can often be seen in everyday life.
The normal force with which the bottom cube is acting on the top cube is equal to the sum of the two individual masses, since they are in free fall and there is no force of gravity acting on either of them. Thus, the magnitude of the normal force is 8.1 kg + 0.5 kg = 8.6 kg.
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the lowest note on a grand piano has a frequency of 27.5 hzhz. the entire string is 2.00 mm long and has a mass of 400 gg. the vibrating section of the string is 1.90 mm long.part awhat tension is needed to tune this string properly?express your answer with the appropriate units.activate to select the appropriates template from the following choices. operate up and down arrow for selection and press enter to choose the input value typeactivate to select the appropriates symbol from the following choices. operate up and down arrow for selection and press enter to choose the input value typetsts
We can use the wave equation for a vibrating string to relate the tension in the string to its frequency and other properties:
How to use the wave equation?f = (1/2L) * sqrt(T/μ)
where f is the frequency, L is the length of the vibrating section of the string, T is the tension, and μ is the linear mass density (mass per unit length) of the string.We can rearrange this equation to solve for T:T = (4L^2 * μ * f^2)
Plugging in the given values, we get:
L = 1.90 mm = 0.00190 m
μ = (mass/length) = 400 g / 2.00 mm = 200 g/m = 0.200 kg/m
f = 27.5 Hz
T = (4 * 0.00190^2 * 0.200 * 27.5^2) = 24.4 N
Therefore, a tension of 24.4 N is needed to tune this string properly.
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Given the displacement vector D = (5î − 8ĵ) m, find the displacement vector (in m) R so that D + R = −5Dĵ. (Express your answer in vector form.)
It is possible to write d = (x2 - x1)i + (y2 - y1)j to represent the displacement vector d from P1 to P2. (x2 - x1) units in the x-direction plus (y2 - y1) units in the y-direction make up the displacement d.
How do you determine the displacement that results?S = x2+y2 is the formula for the displacement that results. S stands for displacement. The item is moving in two directions, with the first being X and the second being Y. Y = 0 if the motion of your item is restricted to one direction.
The vector's magnitude is thus a| r|. A vector's magnitude only changes when it is multiplied by a scalar; its direction remains unchanged unless the scalar is negative.
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Analog Measurement: You use the following ruler to measure the length of your shoelace and find the length to be 17.6 cm or 7.0 in. Using the pkinciple of "least count," what is the uncertainty on each of your measurements (in both cm and in)?
Using the principle of 'least count', the uncertainty on the each of your measurements (in both cm and in) 0.1 cm.
According to the concept of significant figures, the last digit is considered to be the uncertain digit in a measurement. Significant figures are generally used for establishment of a number which is presented in the form of digits. These digits give a lot of meaningful representation to the numbers.
The significant figures are the most significant digits that convey the meaning according to the accuracy. These provide provides a proper precision to the numbers and hence are called as significant numbers. There are numerous rules for counting significant figures which are as follows:
1)All non-zero digits are significant.
2)All zeroes which essentially occur between non-zero digits are significant.
3)All zeroes to the left and right of any non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant.
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The uncertainty on the length of the shoelace is 0.05 cm or 0.03125 in, depending on which unit is used.
The principle of least count states that the uncertainty in a measurement is equal to half the smallest division on the measuring tool. The ruler has two scales, one in centimeters and the other in inches.
The smallest division on the centimeter scale is 1 mm, which means the uncertainty is half of that, or 0.5 mm. Converting to centimeters, the uncertainty is 0.05 cm.
The smallest division on the inch scale is 1/16 inch, which means the uncertainty is half of that, or 1/32 inch. Converting to inches, the uncertainty is 0.03125 in.
Therefore, the uncertainty on the length of the shoelace is 0.05 cm or 0.03125 in, depending on which unit is used.
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Explain the location, function, and main components of the continental shelf, continental shelf break,
continental slope, abyssal plains, oceanic trenches, and submarine canyons.
Answer:34
Explanation: you need to use a calulatoe