COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 8, Problem 21QAP
To determine
To explain:
Why a person on top of seesaw leans backward and person at the bottom leans forward and the relative masses of the persons.
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A tightrope walks across a 30-m long wire tied between two poles. The center of the wire is displaced vertically downward by 1.0 m when he is halfway across. If the tension in both halves of the wire at this point is 6294 N is the mass of the tightrope walker? Neglect the mass of the wire
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70
0• One end of a uniform
meter stick is placed against a
vertical wall (Fig. P70). The
other end is held by a light-
weight cord that makes an
angle 0 with the stick. The
Figure P70
coefficient of static friction
between the end of the meter
- x -
stick and the wall is 0.40.
(a) What is the maximum value
the angle 0 can have if the stick
is to remain in equilibrium? (b) Let the angle 0 be 15°. A block of
the same weight as the meter stick is suspended from the stick, as
shown, at a distance x from the wall. What is the minimum value of
x for which the stick will remain in equilibrium? (c) When
15°, how large must the coefficient of static friction be so that
the block can be attached 10 cm from the left end of the stick with-
out causing it to slip?
Chapter 8 Solutions
COLLEGE PHYSICS
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