College Physics
OER 2016 Edition
ISBN: 9781947172173
Author: OpenStax
Publisher: OpenStax College
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Chapter 5, Problem 19PE
Repeat Exercise 5.18 with the contestant pulling the block of ice with a rope over his shoulder at the same angle above the horizontal as shown in Figure 5.23(b).
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An aluminum block of mass m, = 4.20 kg and a copper block of mass m, = 8.30 kg are connected by a light string over a frictionless pulley. They sit on a steel surface as shown in the figure below, where e = 32.5°. (See this table for the appropriate coefficients of
friction).
Aluminum
Copper
Steel
(a) When they are released from rest, will they start to move?
O Yes
O No
(b) If the blocks move, determine the magnitude of their acceleration. (If the blocks do not move, enter 0.)
|m/s²
(c) If the blocks move, determine the magnitude of the tension in the string. (If the blocks do not move, enter 0.)
In the very Dutch sport of Fierljeppen, athletes run up to a long pole and then use it to vault across a canal as shown in (Figure 1). At the very top of his arc, a 70 kg vaulter is moving at 2.9 m/s and is 5.5 m from the bottom end of the pole.
What is the magnitude of the vertical force that the pole exerts on the vaulter?
Express your answer with the appropriate units.
A small block with mass m is set on the top of an upside-down hemispherical bowl. If the coefficient of static friction between the block and the bowl is μs and the block is slowly repositioned at different points down the surface of the bowl, at what angle measured from the vertical will the block begin to slide? Write your answer in terms of the mass, m; the gravitational acceleration on Earth, g; and the coefficient of static friction, μs. (Assume the +y axis is vertically upward.)
Chapter 5 Solutions
College Physics
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