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11 September, 18:01

A 30 kg girl sits on a seesaw 4.0 m from the fulcrum. what distance from the fulcrum should a 40kg boy sit in order to balance the seesaw

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  1. 11 September, 20:50
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    Answer: 3.0 m

    Explanation:

    Moment of force about the fulcrum is equal to balance the see saw:

    mg d = m'g d'

    It is given that

    mass of the girl, m = 30 kg

    distance from the fulcrum, d = 4.0 m

    mass of the boy, m' = 40 kg

    Distance from the fulcrum, d' = ?

    ⇒30 kg*4.0 m = 40 kg * d'

    ⇒d' = 120 kg. m / 40 kg = 3.0 m

    Thus, in order to balance the see saw, a 40 kg boy must sit at a distance of 3.0 m from the see saw.
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