Momentum 2

A 75 kg hockey player is skating across the ice at a speed of 6.0 m/s. What is the magnitude of the average force required to stop the player in 0.65 s?

• 120 N

• 290 N

• 690 N

• 920 N

A 0.040 kg golf ball leaves the head of a golf club with a speed of 50.0 m/s. How fast would a 0.150 kg baseball have to be thrown to have the same momentum?

• 25.0 m/sec

• 13.3 m/sec

• 50.0 m/sec

• 2.00 m/sec

Two baseball players accidentally run into each other when trying to catch a fly ball. Player #1 is 75 kg and is moving east at 30. m/s. Player #2 is 70. kg and is moving west at 2.0 m/s. How fast are they moving together after the collision?

• 3.0 m/s

• 0.59 m/s

• 1.0 m/s

• 5.0 m/s

A motorcycle being driven on a dirt path hits a rock. Its 60. kg cyclist is projected over the handlebars at 20. m/s into a haystack. If the cyclist is brought to rest in 0.50 s, the magnitude of the average force exerted on the cyclist by the haystack is:

• 5.9 × 10² N

• 2.4 × 10³ N

• 6.0 × 10¹ N

• 1.2× 10³ N

An average force of 20.0 N is exerted on an object for 2.00 s. What is the impulse?

• 40.0 kg*m/s

• 10.0 kg*m/s

• 80.0 kg*m/s

• 50.0 kg*m/s

What impulse must be applied to a 25.0 kg cart to cause a velocity change of 12.0 m/s?

• 0.480 Ns

• 2.10 Ns

• 13.0 Ns

• 300. Ns

A force of 6.0 N changes the momentum of a moving object by 3.0 kg*m/s. How long did the force act on the mass?

• 1.0 s

• 2.0 s

• 0.25 s

• 0.50 s

What is the momentum of an asteroid that has a mass of 1.35 x 10¹² kg and a velocity of 2.55 x 10⁴ m/s?

• 1.89 x 10^-8 kg*m/s

• 5.29 x 10⁷ kg*m/s

• 3.44 x 10¹⁶ kg*m/s

• 8.78 x 10²⁰ kg*m/s

A temporary force acting on a 2 kg object traveling at a velocity of 5 m/s causes the object to slow to a velocity of 2 m/s.What was the decrease in momentum of the object?

• 4 kg*m/s

• 5 kg*m/s

• 6 kg*m/s

• 7 kg*m/s

Two cars are on a horizontal frictionless surface being pushed apart by a compressed spring. Cart A has a mass of 3.0 kg and a velocity of 0.33 m/s after the spring is released. Cart B has a mass of 5.0 kg. The spring applies a force for 0.025 s. What is the total momentum of the system before and after the spring is released?

• 0.99 kg*m/s before and 0.99 kg*m/s after

• zero before and after

• zero before and 1.98 kg*m/s after

• zero before and 0.99 kg*m/s after