Physics: Principles with Applications
7th Edition
ISBN: 9780321625922
Author: Douglas C. Giancoli
Publisher: Addison-Wesley
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Textbook Question
Chapter 9, Problem 37P
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 Fig. 9-74, what is the maximum force Fmax 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.
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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
When picking up an object from the ground, it is generally recommended that you "lift with your legs" - that is, raise and lower yourself
by bending your knees but keeping your upper body upright. If instead, you "lift with your back" by bending at the hip so that your upper
body is angled, then you put a great deal more stress on your spine and back muscles. Consider a person who is "lifting with their
back" such that they are bent at the hip with their upper body is parallel to the ground (i.e., their spine is oriented horizontally). Let us
calculate the tension in the back muscles and the compression on the spine in this situation. We will model the spine and upper body
as a horizontal rigid rod or uniform density with a length of 50.0 cm and a mass of 40.0 kg. Assume that the person attempts to lift an
object with their arms, which we will model as attached at the far end of the rod. Support of the back in this position is provided
primarily by the erector spinalis muscle which we…
The arm shown in the figure supports a 4kg sphere. The mass of the hand and forearm together is 3kg and its weight acts at a point 15 cm from the elbow. Determine the force exerted by the biceps muscle.
Chapter 9 Solutions
Physics: Principles with Applications
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