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A torque of 160 N cdot m is applid to a ...

A torque of `160 N cdot m` is applid to a flywheel initially at rest. If the flywheel acquires kinetic energy of 8 kJ in 5 s, its angular momentum at the end of 5 s is

A

10 SI units

B

32 SI units

C

50 SI units

D

800 SI units

Text Solution

Verified by Experts

The correct Answer is:
D
`tau=(DeltaL)/(Delta t)=(L_(f)-L_(i))/(Delta t)`
Since `L_(i)=0, L_(f)= tau Delta t=(160) (5) = 800 kg cdot m^(2)//s`
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