Physics

# Problems

PhysicsProblems

## 8.1Linear Momentum, Force, and Impulse

16 .
(credit: modification of work from Pinterest)

A 145-g baseball is incoming at a velocity of 35 m/s. The batter hits the ball as shown in the image. The outgoing baseball has a velocity of 40 m/s at the angle shown.

What is the magnitude of the x-component of the impulse?

1. 0.26 kg⋅m/s.
2. 4.09 kg⋅m/s.
3. 4.35 kg⋅m/s.
4. 8.44 kg⋅m/s.
17.

For how long should a force of 130 N be applied to an object of mass 50 kg to change its speed from 20 m/s to 60 m/s?

1. 0.031 s
2. 0.065 s
3. 15.4 s
4. 40 s

## 8.3Elastic and Inelastic Collisions

18.

In an elastic collision, an object with momentum 25 kg⋅m/s (moving to the left) collides with another that has a momentum 35 kg⋅m/s, moving toward it to the right. The first object’s momentum changes to 15 kg⋅m/s, and it is now moving to the right. What is the magnitude of the momentum of the second object after the collision?

1. 5 kg⋅m/s
2. 10 kg⋅m/s
3. 25 kg⋅m/s
4. 75 kg⋅m/s
19 .
Find the recoil velocity of a $65\,\text{kg}$ ice hockey goalie who catches a $0.15\,\text{kg}$ hockey puck slapped at him at a velocity of $50\,\text{m/s}$. Assume that the goalie is at rest before catching the puck, and friction between the ice and the puck-goalie system is negligible.
1. $-0.12\,\text{m/s}$
2. $0\,\text{m/s}$
3. $0.12\,\text{m/s}$
4. $7.5\,\text{m/s}$
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