1.

UIUuo0=tan 1Q. 14. A small body of mass m is tied to a string and revolved in avertical circle of radius r. If the tension in the string at the highestpoint is mg, what is its speed there?​

Answer»

Answer:

8 mg

Explanation:

LET lowest point val. = v

work energy principle

wall=0K

w

G

+w

Y

=K

f

−K

i

[∵w

p

= work done by tension = 0]

mg(2r)=

2

1

m(

3rg

)

2

−

2

1

mv

2

2mgr=

2

3

mgr−

2

1

mv

2

mv

2

=3mgr+4mgr

∴v=

7gr

∴F

=T−mg

r

m(

7gr

)

2

=T−mg

⇒T=7mg+mg=8mg

Hope it helps you

PLS mark me as Brainliest



Discussion

No Comment Found

Related InterviewSolutions