First slide

Pure rotational motion and its kinetic energy

Question

A pot-maker rotates pot-making wheel of radius 3 m by applying a force of 200 N tangentially; because of this if wheel completes exactly 1½ revolution, the work done by him is

Moderate

A

5657.86 J
B

4321.32 J
C

4197.5 J
D

5000 J

Solution

$w o r k d o n e i n r o t a t i o n a l m o t i o n i s τ θ h e r e τ = 200 x 3 θ = 1, 5 x 2 π$

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