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16 November, 16:56

8. If you ran up stairs that were 6 m high in 6.5 seconds and you weigh 600N how much power

was used? (in watts and in Horsepower)

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Answers (1)
  1. 16 November, 17:01
    0
    553.8 Watts

    0.74 Hp

    Explanation:

    Power is work done per unit time, expressed as

    P=W/t

    Where P is power, t is time taken and W is work done.

    Work is the product of force and perpendicular distance moved hence W=Fd where F is force and d is perpendicular distance.

    Substituting W with Fd into the first formula then power is expressed as

    P=Fd/t

    Substituting F with 600 N, d with 6 m and t with 6.5 seconds then

    P=600*6/6.5=553.84615384615 Watts

    Rounded off as 553.8W

    1 W=0.00134 british horsepower

    553.8 W=0.00134*553.8=0.742719926544903597 Hp

    Alternatively, we divide the watts by 746 hence 553.8/746=0.7424211177562

    Rounding off, power is equal to 0.74 Hp
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