Home
Class 12
PHYSICS
A body of mass m is moving in a circle o...

A body of mass m is moving in a circle of radius r with a constant speed v, The force on the body is `(mv^(2))/(r )` and is directed towards the centre what is the work done by the from in moving the body over half the circumference of the circle?

A

`(mv^2)/(pir^2)`

B

zero

C

`(mv^2)/(r^2)`

D

`(pir^2)/(mv^2)`

Text Solution

Verified by Experts

The correct Answer is:
B
Work done by ventripetal force is always zero because force and instantaneous displacement are always perpendicular.
`W=vecFvecs=Fscostheta=Fscos(90^@)=0`
Promotional Banner

Similar Questions

Explore conceptually related problems

A body of mass m is moving in a circle of radius r with a constant speed v, The force on the body is (mv^(2))/(r ) and is directed towards the centre. What is the work done by the force in moving the body over half the circumference of the circle?

A body of mass m is moving in a circle of radius 'r' with a constant speed v. The force on the body is (mv^(2))/(r) and is r directed towards the center. If work done by this force in moving the body over half the circumference and complete circumference is W and W', then:

If the body is moving in a circle of radius r with a constant speed v , its angular velocity is

What is the work done by centripetal force in moving a body through half of the cycle ?

A body of mass 5kg is moving along a circle of radius 1m with a uniform speed of 5m//s . The external force acting on the body is

A body of mass m is movinng in a circlee off radius r with a constant speed v. the work done by the centripetal force in moving the body over half the circumference of the circle is

A body moves along a circle of radius 1 m with a constant kinetic energy 25 j . Then force acting on it is