Graph B represents the velocity of the sphere changes over time when falling with constant acceleration.
- Acceleration is the measure of how quickly a body's velocity varies with regard to time, and constant acceleration occurs when a body's velocity changes proportionately over a period of time, or at a constant rate. It measures in m/s2.
- It is claimed that a body has continual positive acceleration when it begins to move with an initial velocity of zero and gradually increases to a positive value over time.
- Constant positive acceleration is demonstrated by a ball falling freely in a vertical direction.
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<span>A) cools down, slows down. When you put water in the freezer, it cools down and then the particles reduce their speed until they eventually form a solid by freezing.</span>
Work = force x distance
Work= 500kg x 12 m
Work= 6000 kg-m
Answer:
0.1
Explanation:
mass, m = 5 kg
θ = 60°
Force, F = 10 N
velocity is constant , it means the net force is zero.
So, the component of force along the surface is equal to the friction force
FCosθ = friction force
10 x cos 60 = μ x m x g
where, μ is the coefficient of friction
5 = μ x 5 x 9.8
μ = 0.1
Thus, the coefficient of friction is 0.1
Answer:
Explanation:
The net work of the cycle is the sum of works in each process.
<u>For the first process 1-2: </u> Let's apply the work definition.
(1)
Now, we need the pressure. We know that pV=C, where C is a constant. Then ![p_{1}V_{1}=10^{5}2=2*10^{5} [J]](https://tex.z-dn.net/?f=p_%7B1%7DV_%7B1%7D%3D10%5E%7B5%7D2%3D2%2A10%5E%7B5%7D%20%5BJ%5D)
So 
Let's put p in (1):
Using the first law of thermodynamics we can find Q.
<u>Second process 2-3</u>
In this case, we have a constant volume, so the work done here is 0.
<u>Third process 3-1</u>
Finally, the net work is:
By the conservation of energy:
Because there is no change in total energy.
So:
It is a refrigerator because the net work is negative, it means it consumes energy.
I hope it helps you!
