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28 November, 10:24

A 1500 kg wrecking ball hangs from a 16-m-long cable. The ball is pulled back until the cable makes an angle of 24.0 ∘ with the vertical. By how much has the gravitational potential energy of the ball changed?

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  1. 28 November, 10:52
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    55.03 kJ

    Explanation:

    m = 1500 kg

    L = 16 m

    θ = 24 degree

    the height level is changed by ΔL = L - L Cosθ

    So, the change in potential energy, ΔU = m x g x ΔL

    ΔU = 1500 x 9.8 x 16 x (1 - Cos 40)

    ΔU = 55026.35 J = 55.03 kJ
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