Kinematics Question 746
Question: A sphere of mass $ m $ it’s tied to end of a string of length $ l $ and rotated through the other end along a horizontal circular path with speed $ v $ . The work done in full horizontal circle it’s[CPMT 1993; JIPMER 2000]
Options:
A) 0
B) $ ( \frac{mv^{2}}{l} ).2\pi l $
C) $ mg.2\pi l $
D)$ ( \frac{mv^{2}}{l} ).(l) $
Show Answer
Answer:
Correct Answer: A
Solution:
Work done by centripetal force in uniform circular motion is always equal to zero.
