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The moment of inertia of a wheel of radi...

The moment of inertia of a wheel of radiu 20 cm is 40 kg `m^(2)`. If a tangential force of 80 N applied on the wheel, its Rotational K.E. after 4s is

A

16.2J

B

51.2J

C

25.6J

D

24.8J

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • The moment of inertia of a wheel of radius 20cm is 40kgm^(2) . If a tangential force of 80N applied on the wheel , its Rotational K.E. after 4s is

    A
    `16.2J`
    B
    `51.2J`
    C
    `25.6J`
    D
    `24.8`J

  • Three forces act on a wheel of radius 20cm as shown in fig.

    A
    The torque produced by the force of 8N is `0.8`Nm clockwise
    B
    The torque produced by the force of 4N is `0.8` Nm anticlockwise
    C
    The torque produced by the force of 9N is zero
    D
    The net torque produced by the forces is `1.8` Nm clockwise

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    A
    40
    B
    640
    C
    2560
    D
    3200

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