Short Answer Type Questions
19. Explain why, it is easier to stop a tennis ball than a cricket ball moving with the same speed.
20. Explain the meaning of the following equation :
p = m x v
where symbols have their usual meanings.
21. Explain how, a karate player can break a pile of tiles with a single blow of his hand.
22. Calculate the momentum of a toy car of mass 200 g moving with a speed of 5 m/s.
23. What is the change in momentum of a car weighing 1500 kg when its speed increases from 36 km/h to
72 km/h uniformly?
24. A body of mass 25 kg has a momentum of 125 kg.m/s. Calculate the velocity of the body.
25. Calculate the momentum of the following:
(a) an elephant of mass 2000 kg moving at 5 m/s
(b) a bullet of mass 0.02 kg moving at 400 m/s
An elephant of mass 2000 kg
moving at a speed of 5 m/s
A bullet of mass 0.02 kg moving at a
speed of 400 m/s
Answers
Answer:
Explanation:
19. Since mass of tennis ball < mass of cricket ball,
Momentum of tennis ball will be less than that of cricket ball.
So it will be easier to stop the tennis ball as less force will be applied on our palms
20. p = mv
This equation shows that momentum of an object will depend on the mass and velocity of the object.
21. He strikes the pile with his hand very fast. Thus the entire momentum of the fast moving hand is reduced to zero in a very short time.
22. Here, m = 200g
v = 5m/s
p = mv
p = 200 * 5
p = 1000g m/s
The rest questions can be done in the same way as q. 22 by using the formula p = mv
Hope this helps you
Answer:
Explanation:p=mv meaning is p=momentum m=equal mass of the object v=velocity of the object