Download 7. What is the momentum of an 8 kg bowling ball rolling at 2 m/s

Dec13
Monday, December 13, 2010
12:29 PM
7. What is the momentum of an 8 kg bowling ball rolling at 2 m/s? (16kgm/s)
8. If the bowling ball in the previous question rolled into a pillow and stops in 0.5 s, calculate the average force it
exerts on the pillow. (-32 N)
13. A 2.5 kg ball strikes a wall with a velocity of 8.5 m/s to the left. The ball bounces off with a velocity of 7.5 m/s
to the right. If the ball is in contact with the wall for 0.25 s, what is the constant force exerted on the ball by
the wall? (160 N to the right)
14. A football punter accelerates a 0.55 kg football from rest to a speed of 8.0 m/s in 0.25 s. What force does the
punter exert on the ball? (18 N)
15. A pole-vaulter falls from rest from a height of 5.0 m onto a foam rubber pad. The pole-vaulter comes to rest
in 0.3 s after landing on the pad. Calculate the athlete velocity just before reaching the pad. Calculate the
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in 0.3 s after landing on the pad. Calculate the athlete velocity just before reaching the pad. Calculate the
force exerted on the athlete during the collision with the pad. (-9.9 m/s, 1815N)
16. A 0.150 kg baseball moving 26 m/s is slowed to a stop by a catcher in 0.010s. What force did the catcher exert
on the ball? How far did the ball travel before coming to a stop? (-390N, 0.13 m)
2. A 65.0 kg skater is moving forward with a velocity of 2.5 m/s throws a 0.150 kg snowball
forward with a velocity of 32.0 m/s. What is the velocity of the skater after throwing the
ball? (2.43 m/s)
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4. Two carts with masses 4.0 kg and 3.0 kg respectively, move on a frictionless track with
velocities of 5.0 m/s and 4.0 m/s. The carts stick together after colliding head-on. Find
the final speed of the two carts. (1.14 m/s)
3. A tennis player places of 55 kg ball machine on a frictionless surface. The machine fires a 0.057 kg
tennis ball horizontally with a velocity of 36 m/s. What is the velocity of the machine after firing?
(-0.037 m/s)
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