
(a)
The force in the patellar tendon.

Explanation of Solution
Given information:
Cylinder weight with hole = 16 lb
Cylinder weight without hole = 15 lb
Angular velocity = 5 rad/s
Schematic of cylinder 1
Figure A
Unit
Angular acceleration of cylinder be
Let mass centre of the cylinder be G at a distance b from centre A.
Let point P coordinates with point C be
Let point G coordinates with point C be
Let point A coordinates with point C be
Point C acceleration,
Here,
Here,
Hence,
At any location on the cylinder, acceleration is
Point G acceleration,
Point A acceleration,
Substitute
Point A acceleration,
Substitute the above in equation B,
Point A velocity,
Point A acceleration vertical component,
Substitute the above in equation C,
Effective force,
Cylinder free body diagram
Figure B
Moment at point C from above figure,
From equation D, angular acceleration is zero.
Conclusion:
The cylinder angular acceleration is zero.
(b)
Components of the reaction force between the cylinder and the ground.

Explanation of Solution
Given information:
Cylinder weight with hole = 16 lb
Cylinder weight without hole = 15 lb
Angular velocity = 5 rad/s
Forces horizontal component from figure B,
Here,
Hence,
Forces vertical component from figure B,
Cylinder as combination of hole and solid is shown below
Solid cylinder area,
Solid centre of gravity in vertical direction,
Hole area,
Hole centre of gravity in vertical direction,
Equilibrium equation,
Substituting in equation E we get,
Conclusion:
The horizontal component reaction is zero and vertical reaction is
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Chapter 16 Solutions
Vector Mechanics For Engineers
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