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A disc of radius R and mass M is rotating about its axis with an angular velocity ω. What is its rotational kinetic energy? (2020)

Practice Questions

1 question
Q1
A disc of radius R and mass M is rotating about its axis with an angular velocity ω. What is its rotational kinetic energy? (2020)
  1. (1/2)Iω²
  2. (1/2)Mω²
  3. Iω
  4. Mω²

Questions & Step-by-step Solutions

1 item
Q
Q: A disc of radius R and mass M is rotating about its axis with an angular velocity ω. What is its rotational kinetic energy? (2020)
Solution: Rotational kinetic energy K.E. = (1/2)Iω². For a disc, I = (1/2)MR², thus K.E. = (1/4)MR²ω².
Steps: 0

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