PHYSICS F/SCI.+ENGR.,CHAPTERS 1-37
5th Edition
ISBN: 9780134378060
Author: GIANCOLI
Publisher: RENT PEARS
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Chapter 4, Problem 37P
(II) A train locomotive is pulling two cars of the same mass behind it, Fig. 4-39. Determine the ratio of the tension in the coupling (think of it as a cord) between the locomotive and the first car (FT1), to that between the first car and the second car (FT2), for any nonzero acceleration of the train.
FIGURE 4-39 Problem 36.
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Students have asked these similar questions
Three mountain climbers who are roped together in a line
are ascending an icefield inclined at 31.0° to the horizontal
(Fig. 4-69). The last climber slips, pulling the second
climber off his feet. The first climber is able to hold them
both. If each climber has a mass of 75 kg, calculate the ten-
sion in each of the two sections of rope between the three
climbers. Ignore friction between the ice and the fallen
climbers.
31.0°
FIGURE 4-69 Problem 83.
(III) (a) Suppose the coefficient of kinetic friction between
ma and the plane in Fig. 4-62 is µk = 0.15, and that
mA = mB = 2.7 kg. As mB moves down, determine the
magnitude of the acceleration of ma and mg, given 0 = 34°.
(b) What smallest value of pk will keep the system from
accelerating? [Ignore masses of the (frictionless) pulley and
the cord.]
mB
FIGURE 4-62
Problem 67.
The 70.0-kg climber in Fig. 4-72 is supported in the
“chimney" by the friction forces exerted on his shoes and
back. The static coefficients of friction between his shoes
and the wall, and between his
back and the wall, are 0.80 and
0.60, respectively. What is the
minimum normal force he must
exert? Assume the walls are ver-
tical and that the static friction
forces are both at their maximum.
Ignore his grip on the rope.
FIGURE 4–72
Problem 89.
Chapter 4 Solutions
PHYSICS F/SCI.+ENGR.,CHAPTERS 1-37
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