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What is the kinetic energy of a rotating...

What is the kinetic energy of a rotating body about its axis of rotation ?

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The correct Answer is:
`(1)/(2) Iomega^(2)`
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Knowledge Check

  • A pulley of radius 2 m is rotated about its axis by a force F=(20t-5t^2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 Kg-m^2 the number of rotations made by the pulley before its direction of motion is reversed, is

    A
    more than 3 but less than 6
    B
    more than 6 but less than 9
    C
    more than 9
    D
    less than 3

  • A body of mass 10 kg and radius 0.5 m is moving in a circular path. The rotational kinetic energy of the body is 32.8 J. Radius of gyration of the body is

    A
    0.25 m
    B
    0.2 m
    C
    0.5 m
    D
    0.4 m

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    A solid cylinder of mass 20 kg rotates about its axis with angular speed 100 rad s^(-1) . The radius of the cylinder is 0.25 m. What is the kinetic energy associated with the rotation of the cylinder? What is the magnitude of angular momentum of the cylinder about its axis?

    A solid sphere of mass m and radius r is rolling on a horizontal surface. What ratio of total energy of the sphere is: Kinetic energy of rotation ? Kinetic energy of translation ?

    What is the ratio of kinetic energy of electrons rotating in the ground state to that in the first excited state of an atom ?

    The momentum of a body is numerically equal to the kinetic energy of the body. What is the velocity of the body ?

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