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Moment of inertia of a disc is 100 g.cm^...

Moment of inertia of a disc is 100 g.`cm^(2)`. If the disc rotates with an angular velocity of 2 rad `.s^(-1)` the rotational kinetic energy of the disc is

A

100 erg

B

200 erg

C

400 erg

D

50 erg

Text Solution

Verified by Experts

The correct Answer is:
B
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Knowledge Check

  • The moment of inertia of a disc is 100 g . cm^(2) . The disc rotates with an angular velocity 2 rad/s. The rotational kinetic energy of the disc is

    A
    100 erg
    B
    200 erg
    C
    400 erg
    D
    50 erg

  • When a disc rotates with uniform angular velocity, which of the following is not true?

    A
    The sense of rotation remains same.
    B
    The orientation of the axis of rotation remains same.
    C
    The speed of rotation is non zero and remains same.
    D
    The angular acceleration is non-zero and remains same

  • The moment of inertia of a disc of radius 5 cm is 0.02 "kg.m"^(2) . A tangential force of 20 N is applied along the circumference of the disc. The angular acceleration of the disc will be ( in unit rad .s^(-2) )

    A
    2.5
    B
    10
    C
    20
    D
    50

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    What is the moment of inertia of a disc about one of its diameters?

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