Question

A mass of 2kg is tied to the end of a string of length 1m. It is, then, whirled in a vertical circle with a constant speed of  5 ms^-1. Given that g = 10 ms^-2. At which of the following locations of tension in the string will be 70 N 

(a) At the top 

(b) At the bottom 

(c) When the string is horizontal 

(d) At none of the above locations 

Answer 1

Correct Option (b) At the bottom 

Explanation:

Tension = 70 N (sum of above two forces) 

i.e. the mass is at the bottom of the vertical circular path