Kinematics Question 563
Question: A body of mass 0.4 kg it’s whirled in a vertical circle making 2 rev/sec.If the radius of the circle it’s 2 m, then tension in the string when the body is at the top of the circle, it’s [CBSE PMT 1999]
Options:
A) 41.56 N
B)89.86 N
C) 109.86 N
D)115.86 N
Show Answer
Answer:
Correct Answer: D
Solution:
Tension at the top of the circle,$ T=m{{\omega }^{2}}r-mg $
$ T=0.4\times 4{{\pi }^{2}}n^{2}\times 2-0.4\times 9.8=115.86N $
