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PH220 Homework Assignment Linear
Momentum and Rotational Motion
Chap. 7, #10.(II) A 3800-kg open railroad car coasts along with a
constant speed of 8.60 m/s on a level track. snow begins to fall
vertically and fills the car at a rate of 3.50 kg/min. Ignoring friction
with the tracks, what is the speed of the car after 90.0 min?
Chap. 7, #16.(II) A 12-kg hammer strikes a nail at a velocity of 8.5 m/s
and comes to rest in a time interval of 8.0 ms. (a) What is the impulse
given to the nail? (b) What is the avereage force acting on the nail?
Chap. 7, #32. (II) A 28-g rifle bullet traveling 230 m/s buries itself in a
3.6-kg pendulum hanging on a 2.8-m-long string, which makes the
pendulum swing upward in an arc. Determine the vertical and
horizontal components of the pendulum's displacement.
Chap. 7, #36. (II) A ball is dropped from a height of 1.50 m and
rebounds to a height of 1.20 m. Approximately how many rebounds will
the ball make before losing 90% of its energy?
Chap. 8, #5. (II) A child rolls a ball on a level floor 3.5 m to another
child. If the ball makes 15.0 revolutions, what is its diameter?
Chap. 8, #8. (II) A rotating merry-go-round makes one complete
revolution in 4.0 s (Fig. 8–38). (a) What is the linear speed of a child
seated 1.2 m from the center? (b) What is her acceleration (give
components)?
Chap. 8, #18.(II) A wheel 33 cm in diameter accelerates uniformly
from 240 rpm to 360 rpm in 6.5 s. How far will a point on the edge of
the wheel have traveled in this time?
Chap. 8, #24.(II) Calculate the net torque about the axle of the wheel

2. shown in Fig. 8–39. Assume that a friction torque of 0.40m-N opposes
the motion.