A small mass attached to a string rotates on a frictionless tabletop as shown. If the tension in the string is increased, causing the radius of the circular motion to decrease by a factor of 2 , what effect will this have on the kinetic energy of the mass?
A.
It will decrease by a factor of 2 .
B.
It will remain constant.
C.
It will increase by a factor of 2 .
D.
It will increase by a factor of 4 .
E.
It will increase by a factor of 8 .
Exam No：AP Physics C Practice Test Year：2024 Question No：21
Answer:
D
Knowledge points:
2.2 Circular Motion
3.3 Conservation of Energy
Solution:
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