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Question Description
Homework problems: Chapters 7 and 8
An average force of 300 N acts on a golf ball for a time interval of 0.04 s. Whatâs the impulse acting on the ball?
Whatâs the momentum of a 1200 kg car traveling with a speed of 25 m/s?
A force of 45 N acts on a ball for 0.2 s. If the ball has a mass of 0.3 kg and is initially at rest:
a) Whatâs the impulse on the ball?
b) Whatâs the final momentum of the ball?
c) Whatâs the final velocity of the ball?
An ice skater with a mass of 80 kg pushes off against a second skater with a mass of 32 kg. Both skaters are initially at rest.
a) Whatâs the total momentum of the system after they pushed off?
b) If the larger skater moves off with a speed of 3 m/s, whatâs the speed of the smaller skater?
A basketball with mass of 0.8 kg is moving to the right with velocity 6 m/s and hits a volleyball with mass of 0.6 kg that stays at rest. If the volleyball moves to the right with velocity 4 m/s after collision, whatâs the final velocity of the basketball?
A force F1= 20 N is applied to open a door at a distance 50 cm from the spindle. Another force F2is trying to stop opening the door at a distance of 30 cm from the spindle. Find the force F1to balance the door.
What are the differences between elastic and inelastic collisions?
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