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11 September, 08:49

A bulldozer does 4,500 J of work to push a mound of soil to the top of a ramp that is 15 m high. The ramp is at an

angle of 35° to the ground. How much force did the bulldozer apply to the mound of soil? Round your answer to two

significant figures.

Its 520 N

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Answers (1)
  1. 11 September, 10:31
    0
    520 N

    Explanation:

    Work is the dot product of the force vector and displacement vector.

    W = F · x

    This means it is the product of the magnitudes of the vectors and the cosine of the angle between them.

    W = F x cos θ

    The displacement of the soil is 15 m up. The force is parallel to the ramp. So the angle between the vectors is 90° - 35° = 55°.

    Plugging in the values and solving for F:

    4500 J = F (15 m) (cos 55°)

    F = 523 N

    Rounded to two significant figures, the force is 520 N.
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