AIPMT MAINS2011Physics-Circular Motion
AIPMT MAINS 2011 Physics Kinetic Energy MCQ Question
Type: MCQ-conceptual-Medium-Class 11
A small mass attached to a string rotates on a frictionless table top as shown. If the tension in the string is increased by pulling the string causing the radius of the circular motion to decrease by a factor of 2, the kinetic energy of the mass will
A
Increase by a factor of 4
B
Decrease by a factor of 2
C
Remain constant
D
Increase by a factor of 2
Correct Answer
Option A
Detailed Explanation
The kinetic energy is proportional to the square of the velocity. As the radius decreases by a factor of 2, the velocity doubles, leading to an increase in kinetic energy by a factor of 4.
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