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24 September, 20:38

If a steel, thin-shelled wheel of radius r and mass M is moving along the road at 2 m/s, what is the total kinetic energy?

1) 2M

2) 3M

3) 1M

4) 5M

5) 4M

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Answers (1)
  1. 25 September, 00:18
    0
    The moment of inertia for rolling motion is

    I = Mr²

    The linear velocity is v = 2 m/s. The rotational velocity is

    ω = 2/r

    The total KE (kinetic energy) is

    KE = (1/2) Mv² + (1/2) I ω²

    = (1/2) (M) (4) + (1/2) (Mr²) (4/r²)

    = 2M + 2M

    = 4M

    Answer: 4M
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