Worksheet
Practice: Momentum and Energy #1
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Refer to the following information for the next four questions.
A varying, one-dimensional force acts on a 50 kg mass as shown in the following graph.
Find the magnitude of the impulse delivered to the object.
Determine the change in the object's momentum.
If the object's original velocity was -10 m/sec, calculate its final velocity.
What was the magnitude of the "average force" acting on the object during the time graphed?
Refer to the following information for the next three questions.
A 10-gram bullet moving at 250 m/sec bores through a piece of lucite 2.0 cm thick and emerges out the other side at 200 m/sec.
How much did the bullet's momentum change as it moved through the lucite?
If the bullet takes 0.00025 seconds to travel through the lucite, what is the average force exerted on the bullet by the lucite?
What acceleration did the bullet experience while traveling through the lucite?
Refer to the following information for the next five questions.
During target practice, a man shoots a 7-gram bullet with a horizontal velocity of 150 m/sec directly at a 3-kg pumpkin sitting on a post.
If the bullet embeds in the pumpkin, how fast will the pumpkin be knocked off the post?
If the post is 1 meter tall, how much time will it take the pumpkin to strike the ground?
How far from the base of the post will the pumpkin strike the ground?
What will be the pumpkin's resultant impact velocity just as it strikes the ground?
If the dirt where the pumpkin strikes the ground offers an average resisting force of 750 N, how deep of a "dent" will the pumpkin make upon impact as it is being brought to a rest?
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