Question

A small bob of mass m is
tied to a string & revolved in
vertical circle of radius r
If its speed at the highest
point is√3rg , the tension in the
string at the lowest point is.​

Answer 1

Answer:

Tension at highest point

T  

H

​  

=  

r

mv  

2

 

​  

−mg=3mg−mg=2mg

and tension at lowest point

T  

L

​  

=  

r

mv  

2

 

​  

+mg

Here, V  

L

2

​  

=3gr+2g.2r=7gr

So, T  

L

​  

=7mg+mg=8mg

Hence,  

T  

L

​  

 

T  

H

​  

 

​  

=  

8mg

2mg

​  

=  

4

1

​

Explanation:

Answer 2

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