Homework Answers
Moment of inertia = 1/2mr^2= 1/2× 2× 0.15×0.15= 0.0225m^2
Torque = torsional constant X angle of twist
Torsional constant = a
Angle of twist = 15degree= 0.2617radians
1= a X 0.2617
a= 1/0.2617= 3.82Nm/radian
T = 2×pi ( I/ a)^1/2
T = 2×3.14 (0.0225/3.82)^1/2
T= 0.0482s
f=20.7Hz
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