A low-mass board of length 2d-8 m rests on a cylinder (the \"pivot\"). A ball of

Question

A low-mass board of length 2d-8 m rests on a cylinder (the "pivot"). A ball of mass 9 kg is placed on the end of the board. Which of the diagrams below correctly shows the forces acting on the system of ball board? ? C. (b) Take the point at which the board touches the pivot as location A. What is the magnitude of the torque on the system of (ball board) about location A? N -m (c) Which of the following statements are correct? The forces balance, so the angular momentum of the system about location A will not change. Because there is a torque, the angular momentum of the system will change in the next tenth of a second The force by the pivot on the board contributes nothing to the torque about the pivot.

Explanation / Answer

r = d =8/2 = 4 m, m = 9 kg , g = 98.8 m/s^2
Torque = rxF = r*mg

TA = 4*9*9.8 = 352.8 N.m
(c) Because there is a torque, the angular momentum of the system will change in the next tenth of a second

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