A)
Angular velocity, w = 4650 x 2 pi/60 = 486.95 rad/sec
Moment of inertia, I = 0.5 x 420 x 1.5^2 = 472.5 kgm^2
Kinetic energy, E = 0.5 I w^2 = 5.60 x 10^7 J
B)
Power, P = 20 x 746 = 14920 W
Time, t = E/P
t = (5.6 x 10^7)/14920 = 3753.35 sec = 1.04 hrs
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