In the figure, a 11 kg block is held in place via a pulley system. The person's upper arm is vertical; the forearm makes angle 0 = 30° with the horizontal. Forearm and hand together have a mass of 1.8 kg, with a center of mass at distance d1 = 14 cm from the contact point of the forearm bone and the upper- arm bone (humerus). The triceps muscle pulls vertically upward on the forearm at distance d2 = 2.5 cm behind that contact point. Distance d3 is 40 cm. Take the upward direction to be positive. What are the forces on the forearm from (a) the triceps muscle and (b) the humerus? %3D
In the figure, a 11 kg block is held in place via a pulley system. The person's upper arm is vertical; the forearm makes angle 0 = 30° with the horizontal. Forearm and hand together have a mass of 1.8 kg, with a center of mass at distance d1 = 14 cm from the contact point of the forearm bone and the upper- arm bone (humerus). The triceps muscle pulls vertically upward on the forearm at distance d2 = 2.5 cm behind that contact point. Distance d3 is 40 cm. Take the upward direction to be positive. What are the forces on the forearm from (a) the triceps muscle and (b) the humerus? %3D
Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter8: Rotational Motion
Section: Chapter Questions
Problem 69A
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