Download AP1 Ch. 8 Review w/answers

Name ________________________________________________ Period _____________ Date __________
Review _____________________________________________Chapter 8
1. In a spin cycle of a clothes washer, the drum turns at 635 rev/min. If the lid of the washer is opened, the
motor is turned off. It takes 8.0 s for the drum to slow to a stop.
a.) What is the initial angular velocity of the drum?
b.) What is the angular acceleration of the drum?
c.) What is the angular displacement of the drum?
2. A lug nut requires a torque of 56.5 N.m when tightened. The largest force that can be exerted is 175 N.
How long must the wrench handle be, to tighten the lug nut?
3. You have a wrench that is 0.235 m long. You use it on a job that requires of torque of 32.4 N.m and you
can exert a force of 232 N. What is the smallest angle at which you can exert the force to get the job done?
5. A basketball player spins the ball on his finger. The ball has a radius of 15 cm and a mass of 0.75 kg.
What is the moment of inertia of the basketball?
6. A ventilation fan with a moment of inertia of 0.034 kgm2 has a net torque of 0.11 Nm applied to it. What angular
acceleration does it experience?
7. A solid wheel has a mass of 15 kg and a diameter of 0.88 m. The wheel starts from rest and accelerates
uniformly for 15 s. The final velocity of the wheel is 8.0 rev/s.
a.) What is the moment of inertia for the wheel?
b.) What is the angular acceleration of the wheel?
c.) What torque was applied to the wheel to cause the acceleration?
d.) What force must you apply to the wheel to cause the acceleration?
8. A 400.0 N child and a 300.0 N child sit on either end of a 2.00 m long see-saw. Where must the pivot be
located for the see-saw to be in equilibrium (balanced perfectly horizontal)?
9. A 850. N painter stands 1.20 m from one end of a 3.00 m scaffold supported at each end by a stepladder.
The scaffold weighs 250. N. There is a 25 N can of paint located 0.50 m from the end opposite the painter.
What force must be applied to each stepladder to keep the system in equilibrium?