
(a)
To find: The
(a)

Answer to Problem 39P
The angular acceleration of the arm is
Explanation of Solution
Given information:
Assume that a
Formula used:
Here
Calculation:
Use kinematic equations in rotational dynamics to final the angular acceleration and then apply torque condition to find the required force of the triceps muscle.
The angular acceleration of the atom is given as follows
Substituting the values as shown below,
Therefore, the angular acceleration of the arm is
Conclusion:
The angular acceleration of the arm is
(b)
To find: The value of the force.
(b)

Answer to Problem 39P
The required force of the triceps muscle is
Explanation of Solution
Given information:
Assume that a ball is thrown solely by the action of the forearm, which rotates about the elbow joint under the action of the triceps muscle. The ball is accelerated uniformly from rest to
Formula used:
Here,
Calculation:
The moment of inertia of the ball-arm system to find the required force. The moment of inertia of the ball-arm system is given as follows:
Substituting the values as shown below,
Thus, the moment of inertia of the ball-arm system is
The torque acting on the system is given as follows:
Rearrange the equation
Rearrange the equation for
Substituting the values as shown below,
Therefore, the required force of the triceps muscle is
Conclusion:
The required force of the triceps muscle is
Chapter 8 Solutions
Physics: Principles with Applications
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