Elbow joint Biceps muscle 38.0 cm 40.0° 7.50 kg weight

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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A 75.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her hand. Her arm pivots around the elbow joint, starting 40.0 ∘ below the horizontal. (See (Figure 1).) Biometric measurements have shown that both forearms and the hands together account for 6.30 % of a person's weight. Since the upper arm is held vertically, the biceps muscle always acts vertically and is attached to the bones of the forearm 5.50 cm from the elbow joint. The center of mass of this person's forearm-hand combination is 18.5 cm from the elbow joint, along the bones of the forearm, and the weight is held 38.0 cm from the elbow joint.

What force does the biceps muscle exert on the forearm?

Find the magnitude of the force that the elbow joint exerts on the forearm.

 

Elbow
joint
Biceps
muscle
38.0 cm
40.0°
7.50 kg
weight
Transcribed Image Text:Elbow joint Biceps muscle 38.0 cm 40.0° 7.50 kg weight
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