A child is sitting in a chair that hangs from a massless rope.The rope hangs over a frictionless tree branch and runs back into the child's hands.The combined mass of the child and the chair is 32.1 kg.The child's older sister offers to help pull the

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A child is sitting in a chair that hangs from a massless rope.The rope hangs over a frictionless tree branch and runs back into the child's hands.The combined mass of the child and the chair is 32.1 kg.The child's older sister offers to help pull the

A child is sitting in a chair that hangs from a massless rope.The rope hangs over a frictionless tree branch and runs back into the child's hands.The combined mass of the child and the chair is 32.1 kg.The child's older sister offers to help pull the
A child is sitting in a chair that hangs from a massless rope.The rope hangs over a frictionless tree branch and runs back into the child's hands.The combined mass of the child and the chair is 32.1 kg.The child's older sister offers to help pull the chair up the tree.What force must she exert on the rope - from the ground - in order to pull the chair upward with a constant speed?
Answer:

A child is sitting in a chair that hangs from a massless rope.The rope hangs over a frictionless tree branch and runs back into the child's hands.The combined mass of the child and the chair is 32.1 kg.The child's older sister offers to help pull the
一个儿童坐在一个椅子上,这个椅子上系一根轻质绳,这根绳子绕过树叉,另一端在儿童手里.儿童和椅子总质量为32.1Kg.这个儿童的姐姐至少需要提供一个多大的支持力才能使儿童和椅子不断上升
321N

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