Question

Ten boxes, each 35.0 cm high and weighing 251 N, initially are all side by side on the ﬂoor. The boxes are lifted and placed in a vertical stack 3.50 m high in a time interval of 4.00 s. Compute the power necessary to stack the boxes. (a) How much work is required to lift the 9th box in the stack (in order from the ground upward). (b) Compute the total work done on the boxes by the lifter. (c) Compute the power necessary to stack the boxes.

Answer #1

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