Practice Problems 11
1
A car tire is 57.1 cm in diameter. The car is travelling at a speed of 23.2 m/s. What is
the tire's rotation frequency, in rpm? (Do not enter a unit with your answer.)
Answer:
7.76e+02
2
. What is the speed of a point at the top edge of the tire?
Answer:
4.64e+01 m/s
3
. What is the speed of a point at the bottom edge of the tire?
Answer:
0.0 m/s
4
. A 6.28 cm diameter, 340.0 g sphere is released from rest at the top of a 2.10 m long,
24.5° incline. It rolls, without slipping, to the bottom. What is the sphere's angular
velocity at the bottom of the incline?
Answer:
1.11e+02 rad/s
5
. What fraction of its kinetic energy is rotational? (Enter your answer in decimal form,
do not include a unit.)
Answer:
2.86e01
6
. Far out in space, a mass
1
=125500.0 kg rocket and a mass
2
= 236000.0 kg rocket are
docked at opposite ends of a motionless 96.0 m long connecting tunnel. The tunnel is
rigid and has a mass of 13000.0 kg. How far from the 125500.0 kg rocket is the center of
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 Spring '08
 N. MCKAY
 mechanics, Angular Momentum, Kinetic Energy, Mass, Moment Of Inertia, Rigid Body

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