Answer:
A single fixed pulley is used to lift load by changing the direction of the lifting force. Even though a single fixed pulley has no mechanical gain in that, the effort applied is greater than the load, it is preferred in use since you do not have to pull or push the pulley up and down.
Explanation:
The answer itself speaks
Please answer this question sqdancefan
Answer:
(D) 4
Explanation:
The percentage error in each of the contributors to the calculation is 1%. The maximum error in the calculation is approximately the sum of the errors of each contributor, multiplied by the number of times it is a factor in the calculation.
density = mass/volume
density = mass/(π(radius^2)(length))
So, mass and length are each a factor once, and radius is a factor twice. Then the total percentage error is approximately 1% +1% +2×1% = 4%.
_____
If you look at the maximum and minimum density, you find they are ...
{0.0611718, 0.0662668} g/(mm²·cm)
The ratio of the maximum value to the mean of these values is about 1.03998. So, the maximum is 3.998% higher than the "nominal" density.
The error is about 4%.
_____
Additional comment
If you work through the details of the math, you will see that the above-described sum of error percentages is just an approximation. If you need a more exact error estimate, it is best to work with the ranges of the numbers involved, and/or their distributions.
Using numbers with uniformly distributed errors will give different results than with normally distributed errors. When such distributions are involved, you need to carefully define what you mean by a maximum error. (By definition, normal distributions extend to infinity in both directions.) While the central limit theorem tends to apply, the actual shape of the error distribution may not be precisely normal.
Answer:
D. 4Explanation:
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justoko2
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How much force (in Newtons) does a baseball pitcher have to exert on a 250g baseball to make it accelerate to 50 m/s the
Instant that it leaves his hand?
Answer:
Force = 12.5 Newton
Explanation:
Given the following data;
Mass = 250 g to kilograms = 250/1000 = 0.25 kg
Acceleration = 50 m/s²
To find the force;
Newton's Second Law of Motion states that the acceleration of a physical object is directly proportional to the net force acting on the physical object and inversely proportional to its mass.
Mathematically, it is given by the formula;
[tex] Acceleration = \frac {Net \; force}{mass} [/tex]
Making force the subject of formula, we have;
[tex] Force = mass * acceleration [/tex]
Substituting into the formula, we have
[tex] Force = 0.25 * 50 [/tex]
Force = 12.5 Newton
hey what is magnetic field
Answer:
a region around a magnetic material or a moving electric charge within which the force of magnetism acts.
Explanation:
The definition of a magnetic field is a place in space near a magnet or an electric current where a physical field is created from a moving electric charge that creates a force on another moving electric charge. An example of a magnetic field is the Earth's magnetic field.
Warda is driving her car down the street. She has a teddy bear sitting on the back seat. A dog runs in front of Warda's car, so she quickly applies the brakes. The force of the brakes causes the car to stop, but the teddy bear continues to move forward until it hits the car's dashboard.
The teddy bear did not stop at the same time as the car because
Answer:
The teddy bear did not stop at the same time as the car because of inertia.
Explanation:
The teddy bear did not stop at the same time as the car because of inertia.
Inertia is a resistance of an object to change its state of motion so if an object is moving it will continue the movement until a force act on it, and vice-versa if an object is at rest it will continue in that state until a force act on it.
Hence, when the teddy bear was in the back seat and the car suddenly stops, the teddy kept moving forward because that was the direction of motion of the car (the teddy bear was moving forward with the car). The force of the brakes acts on the car but not on the teddy bear (not directly), that is why this force does not change the state of motion of the teddy bear.
Therefore, the teddy bear did not stop at the same time as the car because of inertia.
I hope it helps you!
What is the volume occupied by 15.0 moles of the gas at 280 K at a pressure of 100 Pa?
Consider. R=831 Pa m (mol-K)
Answer:
34902
Explanation:
Pv=nRt
v=nrt/p
subsitute
v=15*831*280/100
v=34902
Select the correct answer. Based on the law of conservation of energy, which statement is correct? A. Energy is always being added to all parts of the Universe. B. Energy is often destroyed in some parts of the Universe. C. Energy in a closed system cannot change forms. D. Energy in an isolated system remains constant.
Answer:
D. Energy in an isolated system remains constant.
Explanation:
Energy can be defined as the ability (capacity) to do work. The two (2) main types of energy are;
a. Gravitational potential energy (GPE): it is an energy possessed by an object or body due to its position above the earth.
b. Kinetic energy (KE): it is an energy possessed by an object or body due to its motion.
Furthermore, the various forms of energy are solar energy, electrical energy, chemical energy, thermal energy, wind energy, nuclear energy etc.
The Law of Conservation of Energy states that energy cannot be destroyed but can only be transformed or converted from one form to another.
According to the law of conservation of energy, we can infer or deduce that the total energy of the system must stay the same because it cannot be destroyed, but kinetic energy (KE) can be transformed to potential energy (PE) and potential energy (PE) can be transformed to kinetic energy (KE) within the system.
Describe how the moment acts in each one of them.
1. Applying a force on the pedal of a bicycle
Answer:
Moment is an expression involving the product of a distance and physical quantityA moment is due to a force not having an equal and opposite force directly along it's line of action. ... It is defined as the product of the force (F) and the moment arm (d). The moment arm or lever arm is the perpendicular distance between the line of action of the force and the center of moments.Moments act about a point in a clockwise or anticlockwise direction.
Answer: A ( how to pedal and balance )
Explanation:
A 59 kg block is positioned 2.0 meters away from another 59 kg block. What is the gravitational force exerted on each object?
A)
5.8 × 10-8 N
B)
2.0 × 10-9 N
C)
9.8 × 10-10 N
D)
1.2 × 10-7 N
Answer:
Explanation:
The gravitational force equation is
[tex]F_g=\frac{Gm_1m_2}{r^2}[/tex] where G is the gravitational constant. Filling in with what we are given and what we know to be true:
[tex]F_g=\frac{6.67*10^{-11}(59)(59)}{(2.0)^2}[/tex] which, when you do the math, comes out to be
[tex]F_g=5.8*10^{-8}N[/tex], choice A.
A truck travelling at 30m/s decelerates at 1.5m/s². How far does it travel during the 10th second after the brakes are applied?
Answer
225 meters.
Explanation:
x=x0+30t-(1/2)(1.5)t^2
x=0+30(10)-(1/2)(1.5)(10)^2
x=300-75
x=225
What is energy and what is the formula of energy
Answer:
Energy is: the ability to do work
The formula for energy is: power x time = energy
Explanation:
Hope this helps (there isn't really an explanation)
2. What is the water pressure at a depth of 24 m in a lake? [Density of water, p = 1 000 kg m- and gravitational acceleration, g = 9.81 ms-²]
Answer:
Pressure = ρgh
pressure (p) is measured in pascals (Pa)
density (ρ) is measured in kilograms per metre cubed (kg/m3)
The fore of gravitational field strength (g) is measured in N/kg or m/s 2
height of column (h) is measured in metres (m)
Answer = 235,200 Pa
Explanation:
Pressure = ρgh
Pressure = 1,000 x 9.8 x 24
Pressure = 235,200 Pa
Please help asap
Which choice best explains how you could use the information about the falling pine cones to answer Question 1.
A. If both pine cones are falling at the same speed, the pine cone that weighs less will have more kinetic energy.
B. If both pine cones are falling at the same speed, the pine cone that weighs more will have more kinetic energy.
C. If both pine cones weigh the same, the pine cone that falls faster will have more kinetic energy.
D. If both pine cones weigh the same, the pine cone that falls slower will have more kinetic energy.
Answer:
A
Explanation:
the object's mass determines the speed of the object and its kinetic energy
What is amu?? How is 1amu=1.606*10*-27?
Answer:
amu is atomic mass unit
All of elements hydrogen is the lightest.
Hydrogen is taken as a basic unit so it happened 1amu
So 1 amu must be hydrogen mass
If I am wrong,Pls tell me the true answer....
The switch is released and the door locks. Explain in detail how this happens.
Answer:
The iron bolt is attracted to the electromagnet. The force of attraction between the electromagnet's core and the iron bolt is greater than the force of the spring, so the iron bolt is pulled out of its housing in the door
Explanation:
Use the universal law of gravitation to solve the following problem.
Hint: mass of the Earth is = 5.97 x 1024 kg
A scientific satellite of mass 1300 kg orbits Earth 200 km above its surface. If Earth has a radius of 6378 km, what is the force of gravity acting on the scientific satellite?
a. Write out the formula for this problem.
b. Plug in the values from this problem into the formula.
c. Solve the problem, writing out each step.
d. Correct answer
Answer:
a.
[tex]F=G\cdot\dfrac{M \cdot m}{r^{2}}[/tex]
b.
[tex]F=6.67430 \times 10^{-11} \dfrac{N \cdot m^2}{kg^2} \times \dfrac{5.97 \times 10^{24} \ kg \times 1,300 \ kg}{(6,578 \ m)^{2}}[/tex]
c.
[tex]F=6.67430 \times 10^{-11} \dfrac{N \cdot m^2}{kg^2} \times \dfrac{5.97 \times 10^{24} \ kg \times 1,300 \ kg}{(6,578 \ m)^{2}} \approx 1.144 \times 10^{13} \ N[/tex]
d. The force of gravity acting on the satellite is approximately 1.144 × 10¹³ N
Explanation:
a. The formula for finding the force of gravity, F, acting object on an object is given as follows;
[tex]F=G\cdot\dfrac{M \cdot m}{r^{2}}[/tex]
Where;
F = The force acting between the Earth and the object
G = The gravitational constant = 6.67430 × 10⁻¹¹ N·m²/kg²
M = The mass of the Earth = 5.97 × 10²⁴ kg
m = The mass of the object
r = The distance between the center of the Earth and the object
b. Finding the gravitational force, 'F', between the Earth and the scientific satellite, we have;
The given mass of the satellite, m = 1,300 kg
The distance between the center of the Earth and the center of the satellite, r = The length of the radius of the Earth + The height of orbit of the satellite
The given height of orbit of the satellite, h = 200 km
∴ r = R + h = 6,378 km + 200 km = 6,578 m
Therefore, by plugging in the values, we get;
[tex]F=6.67430 \times 10^{-11} \dfrac{N \cdot m^2}{kg^2} \times \dfrac{5.97 \times 10^{24} \ kg \times 1,300 \ kg}{(6,578 \ m)^{2}}[/tex]
c. Solving the above equation gives;
[tex]F=6.67430 \times 10^{-11} \dfrac{N \cdot m^2}{kg^2} \times \dfrac{5.97 \times 10^{24} \ kg \times 1,300 \ kg}{(6,578 \ m)^{2}} \approx 1.144 \times 10^{13} \ N[/tex]
d. The force of gravity acting on the satellite, F ≈ 1.144 × 10¹³ Newton
The relative density ofbrass is 8.4. Which of
the following is the BEST statement that can
be made?
(A)
(B)
(C)
Brass is heavier than water.
Water is heavier than brass.
100 cm' of brass is heavier than 100
cm' of water.
100 cm'ofwateris heavier than 100
cm of brass.
(D)
A.brass is heavier than water.
Which two forms of electromagnetic energy are used to produce the
most spectacular fluorescence when placed in darkness?
1. microwaves and x rays
2. microwaves and infrared
3. ultraviolet and x rays
4. ultraviolet and infrared
Answer:
3. ultraviolet and x rays
The two forms of electromagnetic energy are used to produce the most spectacular fluorescence when placed in darkness are ultraviolet and x rays.
What is electromagnetic energy?Electromagnetic radiation is waves of the electromagnetic field, propagating through space, carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays.
What is fluorescence?
Fluorescence is the process in which a substance absorbs light at a high energy, short wavelength and emits light at a lower energy, usually visible wavelength.
What is ultraviolet rays?Ultraviolet rays is a type of electromagnetic waves in which the wavelength is shorter than visible rays. It is responsible for 10% of sunlight and causes sun tan. It is used to purify water in water purifiers. It kill germs.
What is x rays?X rays lies beyond ultraviolet rays. It is used to diagnose in medical field. It can destroy living tissues so excessive exposure should be limited to reduce harmful effect.
The color change of fluorescent minerals is most spectacular when the minerals are placed in darkness and exposed to electromagnetic energy shorter than visible light.
Ultraviolet and x rays are shorter than visible light so they exhibit fluorescent property.
To learn more about Electromagnetic radiation here
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The realese of magma from the crater is called earthquake
True or False
Answer:
False
Explanation:
I'm not the most sure but it seems reasonable that it's false
Good Luck Bestie :3
Answer:
The answer is false. If you want why. I will desxribe you.
A sudden loud sound such as an explosion can damage the ear, as can long-term exposure to high levels of sound. *
Complete question is;
A sudden loud sound such as an explosion can damage the ear, as can long-term exposure to high levels of sound.
A) True
B) False
Answer:
True
Explanation:
This sudden sound described in the question is usually referred to as an impulse sound which can cause damage to hearing. Furthermore, it can lead to a type of hearing loss where one experiences buzzing, roaring or ringing sounds in one's ears.
Thus the statement in the question is true.
Which subatomic particle has the least mass?
O electron
O proton
O neutron
O the atom
Answer:
electron
Explanation:
The electron is the subatomic particle with the least mass. Therefore option A is correct.
Both protons and neutrons have significantly larger masses compared to electrons.
The mass of an electron is approximately 9.1 x 10^-31 kilograms, while the mass of a proton is about 1.67 x 10^-27 kilograms, and the mass of a neutron is also around 1.67 x 10^-27 kilograms.
It's important to note that the "atom" is not a subatomic particle but a structure composed of subatomic particles. An atom consists of a nucleus (composed of protons and neutrons) and electrons orbiting around the nucleus.
The mass of an atom depends on the number of protons, neutrons, and electrons it contains, so it can vary widely depending on the specific atom.
In summary, when comparing individual subatomic particles, the electron has the least mass.
Know more about electrons:
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True or false please help I’ll give brainliest
Answer:
All of them are false
Explanation:
4. electrons flow from earth to the object
5. electrons move freely
6. protons can't move
Answer:
They all false
what is meant by fundamental unit? write any two difference between mass and weight.
Answer:
Fundamental unit is any unit that is not dependent on other units and other units can be derived from them
Explanation:
Units such as Kilogram, Mass and Time are said to be fundamental units because they are independent.
Differences between Mass and weight;
1. Mass is the measure of the amount of matter in a body while weight is a measure of how the force of gravity acts upon that mass.
2. Mass is a scalar quantity while weight is a vector quantity
The isotope used to remove cancer malignancy cell the given options are a. Strontium 89 b. Uranium 238 c. Carbon 14 d. Chlorine 37.......... can anyone tell me the ans plzz
Answer:
B. Uranium 238.
Explanation:
It is radioactive and can be used to treat cancer in the form of radiotherapy
Please help ASAP!!
The velocity-time graph of a particle moving in a straight line is shown in a figure. Find the distance travelled by the particle in the time interval t = 0 and t= 10 s.
Answer:
40 m
Explanation:
The area under v-t graph gives the distance travelled by the particle.
Distance = area of ΔOBC + area of ΔCDE + area of ΔEFG
[tex]=\dfrac{1}{2}\times 4\times 10+\dfrac{1}{2}\times 2\times 10+\dfrac{1}{2}\times 4\times 5\\\\=40\ m[/tex]
So, the distance travelled by the particle in the time interval t = 0 and t= 10 s is equal to 40 m.
An effort of 20N is applied to lift a load.If the load arm and effort arm are 15cm and 60cm respectively,calculate the load.
Answer:
Load = 80 Newton
Explanation:
Given the following data:
Effort = 20 N
Load arm = 15 cm
Effort arm = 60 cm
Conversion:
100 cm = 1 meters
15 cm = 15/100 = 0.15 meters
60 cm = 60/100 = 0.6 meters
To calculate the load, we would use the expression;
Effort * effort arm = load * load arm
Substituting into the expression, we have;
20 * 0.6 = load * 0.15
12 = load * 0.15
Load = 12/0.15
Load = 80 Newton
A brick is lying on a table in a state of static equilibrium. If the mass of the brick is 7.52 kilograms, what is the normal force exerted by the table on the brick?
Answer:
-mg = -7.52*9.8 = - 73.696N
Answer:
See image
Explanation:
Plato
If each metal is hit with light at the minimum wavelength, can I vary the intensity of the light to start emitting electrons? Yes or no? Explain
Answer:
Consequently the statement is FALSE
Explanation:
The process of emission of electrons or photoelectric effect, was explained by Einstein, assuming that light behaves as formed by how many so-called photons and each one of them collides with an electron, therefore to start an electron the incident photon energy must be greater than the work function of the material.
E =K + Ф
By mentioning the intensity we increase the number of photons but we do not increase their energy.
Consequently the statement is FALSE
Which of the following is an example of the electrical force?
A. A rollercoaster car remains on the track despite being upside
down.
B. A crate rests on a loading ramp, despite the force of gravity pulling
it down the ramp.
C. A sock sticks to a pair of pants after both are removed from the
clothes dryer.
D. A bar magnet held above metal shavings causes them to move
and clump together.
Answer:
C. A sock sticks to a pair of pants after both are removed from the
clothes dryer.
Explanation:
there is influence of charges
how does a dragline excavator work
Suggest one reason why the experiment might not have given a correct value for
the specific heat capacity of the metal.
Answer:
It is because some of the heat is lost in the surroundings.
Explanation:
To calculate the specific heat of the metal, the following steps are performed.
Take a piece of metal whose mass and the initial temperature is known.
Now take a beaker filled with some measured amount of water and the temperature of water is known.
Drop the heated metal piece in the water so that the equilibrium is reached.
According to the principle of calorimetery,
Heat lost by the metal = heat gained by the water
here, some of the heat is lost in the surroundings so we don't get the correct value of the specific heta of the metal.