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27 January, 22:04

What is the maximum height to which a motor

having a power rating of 20.4 watts can lift a

5.00-kilogram stone vertically in 10.0 seconds?

(1) 0.0416 m (3) 4.16 m

(2) 0.408 m (4) 40.8 m

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Answers (1)
  1. 27 January, 22:37
    0
    Energy delivered by the motor = 20.4 x 10 = 204 J. Maximum height the stone can be lifted: mgh = 204 J, 5 x 9.81 x h = 204 J, h = 204 / (9.81 x 5) = 4.16 m. Hence the answer is (3)
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