Sally sits on a see-saw 1 m from the axis of rotation. Her dad pulls downward on the other side 2.5 m from the axis, but this see-saw is rusty and only 80% efficient. How much force must he apply if Sally has a mass of 15 kg. Neglect the mass of the see-saw.

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In order to determine the force required to balance Sally on the opposite side of th... View the full answer