a 15 kg block is held in place via a pulley system. The person’s upper arm is vertical; the forearm is at angle u = 30° with the horizontal. Forearm and hand together have a mass of 2.0 kg, with a center of mass at distance d1 = 15 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 35 cm.What are the (a) magnitude and (b) direction (up or down) of the force on the forearm from the triceps muscle and the (c) magnitude and (d) direction (up or down) of the force on the forearm from the humerus?

a 15 kg block is held in place via a pulley system. The person’s upper arm is vertical; the forearm is at angle u = 30° with the horizontal. Forearm and hand together have a mass of 2.0 kg, with a center of mass at distance d1 = 15 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 35 cm.What are the (a) magnitude and (b) direction (up or down) of the force on the forearm from the triceps muscle and the (c) magnitude and (d) direction (up or down) of the force on the forearm from the humerus?

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter10: Rotational Motion

Section: Chapter Questions

Problem 30P

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Question

a 15 kg block is
held in place via a pulley system. The
person’s upper arm is vertical; the forearm
is at angle u = 30° with the horizontal.
Forearm and hand together have a
mass of 2.0 kg, with a center of mass at distance
d1 = 15 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 35 cm.What are the (a) magnitude and
(b) direction (up or down) of the force on the forearm from the triceps
muscle and the (c) magnitude and (d) direction (up or down) of
the force on the forearm from the humerus?

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