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Question
Assume that a climber having mass M, and who are L tall, rappels down a vertical cliff with her body rose at a 43 degree angle above the horizontal. The climber has a center of gravity at R_g from her feet; she holds the rope at R_r from her feet, and makes at a 23 degree angle with the cliff face. Also, hanging straight down from her shoulders (a distance R_b from her feet) is a backpack having mass m. assume that R_g < R_r < R_b < L. Call horizontal and vertical forces between her feet and the wall H and V. write down the expression for net torque acting on her with respect to the top of her head.
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A dockworker applies a constant horizontal force of 84.0\({\rm N}\) to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 12.5\({\rm m}\) in a time 4.80\({\rm s}\)
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A sphere of radius R is uniformly charged to a total charge of Q. It is made to spin about an axis that passes through its center with an angular speed ω. Find the magnitude of the resulting magnetic field at the center of the sphere.
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