A disc of mass 2 kg and radius 10 cm is rotating about an axis tangent to it and parallel to its diameter with an angular velocity of 10 rad /s. The kinetic energy of the disc is
Text Solution
Verified by ExpertsThe correct answer is:
C
Moment of inertial of the disc about the axis of rotation is
I = 
+mR 2 = 
mR 2
∴ ∴ Kinetic energy of the disc = 
= 
mR 2 ω ω 2 = 
× × 2 × × (0.1) 2 × × (10) 2 = 1.25 J
is correct.
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