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UPSC Civil Service Exam Questions - Engineering

Q1:

The kinetic energy in Nm of a circular disc of 20 m diameter and 10 cm thick, of material weighing 100 kg/m3, rotating above an axis through its centre at right angles to its place and making 2000 rpm is

A

B

C 2 x 108 π3

D 4 x 108 π3

ANS:B -

KE = 0.5 m V^2.
V= angular velocity.
V= 2π N/60.