Concept explainers
Part (a)
The magnitude of the force
Part (a)
Answer to Problem 34P
Solution:
Explanation of Solution
Given:
Total mass of the arm,
Formula used:
Equilibrium condition: the net force and torque would be zero.
Calculation:
Take torque about the joint:
Conclusion:
Thus, the force exerted by the deltoid muscle=249.9N.
Part (b)
The magnitude of the force Fj exerted by the shoulder joint on the upper arm and the angle (to the horizontal) at which it acts.
Part (b)
Answer to Problem 34P
Solution:
Explanation of Solution
Given:
Total mass of the arm,
Formula used:
Equilibrium condition: the net force and torque would be zero.
Calculation:
Conclusion:
Thus, the magnitude of the force exerted by the shoulder joint on the upper arm is 243.5 N at an angle of 7.62o.
Chapter 9 Solutions
Physics: Principles with Applications
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