Advertisements
Advertisements
प्रश्न
Find the momentum of a body of mass 100 g having a kinetic energy of 20 J.
Advertisements
उत्तर
We have,
Kinetic energy of the moving body, (K.E) = 20 J
Mass of the moving body, (m) = 0.1 kg
We have a relation between momentum and kinetic energy as, `P = sqrt(2(K.E)(m))`
So ,
`(P) = sqrt(2(20)(0.1))`
= 2 kg.m/s
So , the momentum of the moving body is 2 kg.m/s .
APPEARS IN
संबंधित प्रश्न
State two factors on which the kinetic energy of a moving body depends.
Two toy-cars A and Bof masses 200 g and 500 g respectively are moving with the same speed. Which of the two has greater kinetic energy?
A bullet of mass 50 g is moving with a velocity of 500 m s−1. It penetrated 10 cm into a still target and comes to rest. Calculate:
- the kinetic energy possessed by the bullet, and
- the average retarding force offered by the target.
A body of mass 10 kg is moving with a velocity 20 m s-1. If the mass of the body is doubled and its velocity is halved, find:
- the initial kinetic energy, and
- the final kinetic energy.
Write an expression for the kinetic energy of a body of mass m moving with a velocity v.
If the speed of a body is halved, what will be the change in its kinetic energy?
What is the kinetic energy of a body of mass 1 kg moving with a speed of 2 m/s?
Derive the formula for the kinetic energy of an object of mass m, moving with velocity v.
When a bell fixed on a cycle rings, then the energy conversion that takes place is ______.
If the mass as well as the velocity of a body is doubled then the kinetic energy of the body ______ the initial kinetic energy.
