Home
Class 12
PHYSICS
A block of mass m at the end of a string...

A block of mass m at the end of a string is whirled round in a vertical circle of radius R. The critical speed of the block at the top of its swing below which the string would slacken before the block reaches the top is

A

`Rg`

B

`(Rg)^(2)`

C

`(R)/(g)`

D

`sqrt(Rg)`

Text Solution

Verified by Experts

At highest point `(mv^(2))/(R)=mgimpliesv=sqrt(gR)`
Promotional Banner

Similar Questions

Explore conceptually related problems

A block of mass m at the end of a string is whirled round in a vertical circle of radius R. The critical speed of the block at top of its swing below which the string would slacken before the block reaches the bottom is?

A body is mass m is rotating in a vertical circle of radius 'r' with critical speed. The difference in its K.E at the top and at the bottom is

A stone of of mass 0 .25 kg tied to the end of a string is whirled round in a circle of radius 1.5 m with a speed of 40 rev//min in a horizontal plane What is the tension in the string ? What is the maximum speed with which the stone can be whirled around If the string can withstand a maximum tension of 200 N ?

An object of mass 10kg is attached to roof by string whirled round a horizontal circle of radius 4 and and and 30^@ to the vertical. The tension in the string (approximately) is

A stone of mass of 1 kg is tied to the end of a string 1 m long. It is whirled in a vertical circle. The velocity of the stone at the bottom of the circle is just sufficient to take it to the top of circle without slackening of the string. What is the tension in the string at the top of the circle? (Take, g =10 ms^(-2) )

The block of mass m is at rest. Find the tension in the string A .

A block of mass m is attached to one end of a light string which is wrapped on a disc of mass 2m and radius R. The total length of the slack portion of the string is 1. The block is released from rest. The angular velocity of the disc just after the string becomes taut is

A particle of mass m is rotating by means of a string in a vertical circle. The difference in the tension at the bottom and top would be-