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18 October, 08:36

What is the power output of an electric motor

that lifts a 2.0-kilogram block 15 meters

vertically in 6.0 seconds?

(1) 5.0 J (3) 49 J

(2) 5.0 W (4) 49 W

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Answers (1)
  1. 18 October, 11:35
    0
    Mass of the block = 2.0 kg

    Value of gravity = 9.81 m/s^2

    Distance upto which the mass is lifted = 15 meters

    Time taken to lift the mass of the block = 6.0 seconds

    Now we already know

    Work Done = Mass * Gravity * Distance

    = 2 * 9.81 * 15

    = 294 Joules

    Then

    Power Output = Work Done/Time

    = 294/6

    = 49 Watts

    So the power output of the electric motor is 49 watts. The correct option among all the options given in the question is option "4".
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