Advertisements
Advertisements
प्रश्न
How much work is needed to be done on a ball of mass 50 g to give it a momentum of 5 kg cm s-1?
Advertisements
उत्तर
Kinetic energy is related to momentum as
K.E. where K = `p^2/(2 m)` and p is the momentum of the body
K.E. is nothing but work done
∴ K.E. = Work done = `("momentum")^2/(2 xx "mass of body")`
= `(5)^2/(2 xx (50/1000))`
= `(5 xx 5)/(2 xx (1/20))`
Work done = `25/(1/10)`
= 25 × 10
= 250 J
APPEARS IN
संबंधित प्रश्न
Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?
A freely falling object eventually stops on reaching the ground. What happens to its 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.
If the speed of a body is halved, what will be the change in its kinetic energy?
On what factors does the kinetic energy of a body depend?
Two objects having equal masses are moving with uniform velocities of 2 m/s and 6 m/s respectively. Calculate the ratio of their kinetic energies.
What do you understand by the kinetic energy of a body?
When the speed of a moving object is doubled, then its kenetic energy ______.
The kinetic energy of a given body depends on the ______.
