Chapter 5
- (p.129 prob.65) A 2.0-kg silverware drawer does not slide readily. the
owner gradually pulls with more and more force, and when the applied force
reaches 8.0N, the drawer suddenly opens, throwing all the utensils to the
floor. What is the coefficient of static friction between the drawer and the
cabinet?
Answer.
- (p.130 prob.72) A roller coaster reaches the top of the steepest hill with
a speed of 6.0km/h. It then descends the hill, which is at an average angle
of 45° and is 45.0 m long. What will its speed be when it reaches the
bottom? Assume mk = 0.12.
Answer.
-
(p.130 prob.75) A device for training astronauts and jet fighter pilots is
designed to rotate the trainee in a horizontal circle of radius 10.0m. If the
force felt by the trainee is 7.75 times her own weight, how fast is she rotating?
express your answer in both m/s and rev/s.
Answer.
- (p.131 prob.86) A 28.0-kg block is connected to an empty 1.00-kg bucket by a
cord running over a frictionless pulley (Fig. 5-43). the coefficient of static
friction between the table and the block is 0.450 and the coefficient of
kinetic friction between the table and block is 0.320. Sand is gradually added
to the bucket until the system just begins to move. (a) Calculate the
mass of sand added to the bucket. (b) Calculate the acceleration of the
system.
Answer.
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