Physics for Scientists and Engineers with Modern Physics, Technology Update
9th Edition
ISBN: 9781305401969
Author: SERWAY, Raymond A.; Jewett, John W.
Publisher: Cengage Learning
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Chapter 9, Problem 80AP
A small block of mass m1 = 0.500 kg is released from rest at the top of a frictionless, curve-shaped wedge of mass m2 = 3.00 kg, which sits on a frictionless, horizontal surface as shown in Figure P9.80a. When the block leaves the wedge, its velocity is measured to be 4.00 m/s to the right as shown in Figure P9.80b. (a) What is the velocity of the wedge after the block reaches the horizontal surface? (b) What is the height h of the wedge?
Figure P9.80
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Problem B2. A small box of mass m = 1.50 kg starts from rest and glides down a
smooth, frictionless hill fromn a height h = 2.00 m to the base, where it meets a
rough plank of mass M = 5.00 kg that is resting on the frictionless horizontal
ground surface. Due to the friction between the box and the plank, its speed is
reduced until, at a certain moment, it begins to move together with the plank as if
they were a single object.
Figure B2. Problem diagram B2
b) Find the speed with which the box and the plank move together.
Problem B2. A small box of mass m = 1.50 kg starts from rest and glides down a
smooth, frictionless hill from a height h = 2.00 m to the base, where it meets a
rough plank of mass M = 5.00 kg that is resting on the frictionless horizontal
ground surface. Due to the friction between the box and the plank, its speed is
reduced until, at a certain moment, it begins to move together with the plank as if
they were a single object.
M
Figure B2. Problem diagram B2
d) Can it be ensured that the work done by the friction forces does not depend on
the choice of the reference frame? Justify your reasoning.
Problem B2. A small box of mass m = 1.50 kg starts from rest and glides down a
smooth, frictionless hill from a height h = 2.00 m to the base, where it meets a
rough plank of mass M = 5.00 kg that is resting on the frictionless horizontal
ground surface. Due to the friction between the box and the plank, its speed is
reduced until, at a certain moment, it begins to move together with the plank as if
they were a single object.
M
Figure B2. Problem diagram B2
c) Calculate the work done by the friction forces present in the problem.
Chapter 9 Solutions
Physics for Scientists and Engineers with Modern Physics, Technology Update
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Impulse Derivation and Demonstration; Author: Flipping Physics;https://www.youtube.com/watch?v=9rwkTnTOB0s;License: Standard YouTube License, CC-BY