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A hollow tube (I = MR2) rolls without slipping along the surface. The ratio of its translational kinetic energy to its rotational kinetic energy is

a. 1
b. 2
c. 3
d. 1/2
e. 1/3
I say A becasue both add up to get the total kinetic energy.

  • PHYSICS - ,

    Translational KE is (1/2) M V^2
    Rotational KE is (1/2)I w^2
    = (1/2) M R^2*(V/R)^2 = (1/2) M V^2

    Your answer is correct but your reasoning is faulty. The ratio could be anything and they would still add up to give total KE

  • PHYSICS - ,

    The Answer is "I don't know. Ask I".

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