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12 July, 13:29

A boy flies a kite with the string at a 30 degree angle to the horizontal. The tension in the string is 4.5N.

How much work in J does the string do on the boy if the boy stands still?

How much work does the string do on the boy if the boy walks a horizontal distance of 11m away from the kite?

How much work does the string do on the boy if the boy walks a horizontal distance of 11m toward the kite

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  1. 12 July, 13:36
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    From our physics class, we know that Work is a product of Force and Displacement. The force must be the force in the same direction with the displacement. So force and displacement must be parallel.

    A. How much work in J does the string do on the boy if the boy stands still?

    Since we know that: Work = Force * Displacement

    and in this case displacement is equal to zero, therefore Work must also be equal to zero.

    Work = 0

    B. How much work does the string do on the boy if the boy walks a horizontal distance of 11m away from the kite?

    Now are given a displacement of 11 m which is a horizontal distance. Therefore we must first calculate the horizontal component of force:

    Fx = 4.5 N * cos 30

    Fx = 3.897 N

    So work is:

    Work = 3.897 N * 11 m

    Work = 42.87 J ~ 43 J
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