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60. (a) If
L
(= 1500 cm) is the unstretched length of the rope and
Δ
L
=
28
.cm
i
s
t
h
e
amount it stretches then the strain is
Δ
LL
/.
/
.
==
×
−
2 8
1500
19 10
3
cm
cm
bg
b
g
.
(b) The stress is given by
F
/
A
where
F
is the stretching force applied to one end of the
rope and
A
is the cross–sectional area of the rope. Here
F
is the force of gravity on the
rock climber. If
m
is the mass of the rock climber then
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 Spring '08
 Any
 Physics, Force

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