Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Question
Chapter 5, Problem 55P
(a)
To determine
To Calculate: The way force F depends on angle
(b)
To determine
To Compute: The force for different angles.
To Plot: F versus
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Problem 12: A box slides down a plank of length d that makes an angle of 0 with the
horizontal, as shown. The kinetic and static coefficients of friction are µk and us, respectively.
Omin = 1
Part (a) Enter an expression for the minimum angle at which the box, if initially at rest, will begin to slide.
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acotan(us) atan(us) cos(a) ( ) 7 8 9
cos(p) cos(0) sin(a)
5 6
sin(o) sin(0)
0
α
1
2 3
Mk
d
t
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Part (b) Enter an expression for the nonconservative work done by kinetic friction as the block slides down the plank. Assume the box starts from rest, and
is large enough that it will slide down the plank.
the angle
Part (c) For a plank of any length, at what angle, in degrees, will the final speed of the box at the bottom of the plank be 0.51 times the final speed of the
box when there is no friction present? Assume μ = 0.39.
Chapter 5 Solutions
Physics for Scientists and Engineers
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