
Concept explainers
(a)
To Calculate: The moment of inertia of combination of platform-drum.
(a)

Answer to Problem 82P
The moment of inertia of combination of platform-drum is
Explanation of Solution
Given data:
Radius of the concentric drum,
Mass of the hanging object,
Distance through which the object falls,
Time,
Formula used:
Torque,
Where, I is the moment of inertia and
From Newton’s second law of motion:
Where, F represents force, m represents mass and a represents acceleration.
Second equation of motion is:
Where, s is the displacement, t is the time, a is the acceleration and
Calculation:
Apply the Newton’s second law of motion to the platform
Apply the Newton’s second law of motion to the weight:
Relation between angular acceleration and acceleration is
Substituting for
Now, substituting for the tension in equation
The relation among the distance, acceleration and time is given by
The intial velocity
Substitute for the initial velocity
The moment of inertia of combinaiton of platform-drum is:
Conclusion:
The moment of inertia of combination of platform-drum is
(b)
To Calculate: The total moment of inertia.
(b)

Answer to Problem 82P
The total moment of inertia is
Explanation of Solution
Given data:
Radius of the concentric drum,
Mass of the hanging object,
Distance fall by the object,
Time,
Formula used:
From the previous part:
Calculation:
Substitute the values and solve for total moment of inertia:
Conclusion:
Total moment of inertia is
(c)
To Calculate: The moment of inertia of the object.
(c)

Answer to Problem 82P
The moment of inertia of the object is
Explanation of Solution
Given data:
The total moment of inertia is
The moment of inertia of combination of platform-drum is
Formula used:
The moment of inertia of the object can be calculated by using the formula:
Calculation:
Moment of inertia of the object,
Conclusion:
Moment of inertia of the object is
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Chapter 9 Solutions
PHYSICS F/SCI.+ENGRS.,STAND.-W/ACCESS
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