College Physics
OER 2016 Edition
ISBN: 9781947172173
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
Chapter 9, Problem 18CQ
Suppose the biceps muscle was attached through tendons to the upper arm dose to the elbow and the forearm near the wrist. What would be the advantages and of this of construction for the motion of the arm?
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If you are holding a 25lb weight in your hand 30cm from your elbow joint and your biceps brachii is generating a 30lb upward force at its attachment 5cm from the axis at 30° of elbow flexion, what will happen to the weight?
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If 25 kg is the maximum mass m that a person can
hold in a hand when the arm is
positioned with a 105° angle at the elbow as shown
in the figure below, what is the
maximum force, FM, that the biceps muscle exerts
on the forearm? Assume the forearm
and hand have a total mass of 2.0 kg with a CG that
is 15 cm from the elbow, and that the
biceps muscle attaches 5.0 cm from the elbow.
(please include given and explain step by step)
E
105°
max
5.0 cm
15 cm
25 kg
(2.0 kg)g
-35 cm
Chapter 9 Solutions
College Physics
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