A 4 kg mass moves on a circular track ra...

A 4 kg mass moves on a circular track radius 2 m with 120 rev/min its KE will be

A

2 J

B

32 J

C

80 J

D

1262 J

Text Solution

Verified by Experts

The correct Answer is:

D

Kinetic energy of the moving mass,
`KE=(1)/(2)mr^(2)omega^(2)`
`omega=2pi(120)/(60)=4pi`
`thereforeKE=(1)/(2)xx4xx(2xx4pi)^(2)`
=1262 J.

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