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Achild of mass m is swinging on a swing set. the ropes attaching the swing to the top bar have length l. find the gravitational potential energy of the child relative to her lowest position when the ropes are (a) hanging straight down; (b) exactly horizontal; (c) at an angle θ from the vertical; and (d) at an angle phi from the horizontal.
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Achild of mass m is swinging on a swing set. the ropes attaching the swing to the top bar have lengt...
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