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A flywheel of mass 4 kg has a radius of ...

A flywheel of mass 4 kg has a radius of gyration of 0.1 m . If it makes 4 revolutions/sec , then its rotational K.E. is
`("use "pi^(2)=10)`

A

8 J

B

6.4 J

C

12.8 J

D

16 J

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Knowledge Check

  • A whell of mass 4 kg and radius of gyration 0.4 m is making 300 r.p.m. Its moment of inertia is

    A
    `"6.4 kg m"^(2)`
    B
    `"0.64 kg m"^(2)`
    C
    `"0.32 kg m"^(2)`
    D
    `"64 kg m"^(2)`

  • A wheel of mass 10 kg and radius of gyration 50 cm is rotating at 300 rpm. Then, the rotational kinetic energy of the wheel is

    A
    8 kJ
    B
    6.4 kJ
    C
    1.2 kJ
    D
    2.2 kJ

  • A fly wheel of mass 60 kg and radius 40 cm is revolving at 300 rpm, then its rotational K.E. is

    A
    `(48)/(pi^(2))J`
    B
    `480 pi J`
    C
    `(48)/(pi)J`
    D
    `240 pi^(2)J`

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    A flywheel of mass 25 kg has a radius of 0.2 m . It is making 240 rpm. What is the torque necessary to bring it to rest in 20 s ? If the torque is due to a force applies tangentially on the rim of the wheel, what is the magnitude of the force ? Assume that mass of flywheel is concentrated at its rim.

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