10.53:
a)
(
29
(
29
(
29
.
m
kg
955
.
0
rev/min
rad/s
30
rev/min
100
s
0
.
2
m
N
0
.
5
2
⋅
=
⋅
=
∆
∆
=
=
π
ω
t
τ
α
τ
I
b) Rather than use the result of part (a), the magnitude of the torque is proportional to
α
and hence inversely proportional to


t
∆
; equivalently, the magnitude of the change in
angular momentum is the same and so the magnitude of the torque is again proportional
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