Laws Of Motion Question 345

Question: A particle tied to a string describes a vertical circular motion of radius r continually. If it has a velocity 3gr at the highest point, then the ratio of the respective tensions in the string holding it at the highest and lowest points is

Options:

A) 4:3

B) 5:4

C) 1:4

D) 3:2

Show Answer

Answer:

Correct Answer: C

Solution:

[c] Tension at the highest point

Ttop=mv2rmg=2mg(vtop=3gr)

Tension at the lowest point

Tbottom=2mg+6mg=8mg

TtopTbottom=2mg8mg=14.



NCERT Chapter Video Solution

Dual Pane