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Work, Energy, and Power — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsWork, Energy, and Power1 Mark
MCQ
In which case, work done will be zero:
  • A
    A weight-lifter while holding a weight of 100kg on his shoulders for 1min.
  • B
    A locomotive against gravity when it is running on a level plane with a speed of 60kmh-1.
  • C
    A person holding a suitcase on his head and standing at a bus terminalAll of the above.
  • D
    All of the above.
✓

Answer

  1. All of the above.

Explanation:

Work done by weight-lifter is zero because there is no displacement. In a locomotive, work done is zero because force and displacement are mutually perpendicular to each other.

While a person holding a suitcase, work done is zero because there is no displacement.

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