Advertisements
Advertisements
प्रश्न
A cannon ball of mass 500 g is fired with a speed of 15 m s-1. Find:
- its kinetic energy.
- its momentum.
Advertisements
उत्तर
(i) Mass of canon ball = 500g = 0.5 kg
Speed, v = 15m/s
Kinetic energy of ball = `1/2 xx "mass" xx ("velocity")^2`
`= 1/2 ×0.5 ×(15)^2`
`= 1/2 ×0.5 ×225`
`=56.25 "J"`
(ii) Momentum of ball p = mv = `1/2 xx 15`
= 7.5 kg ms-1
APPEARS IN
संबंधित प्रश्न
An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.
Name the unit of physical quantity obtained by the formula `(2K)/v^2` Where K: kinetic energy, v: linear velocity
When a boy doubles his speed, his kinetic energy becomes
Define the term kinetic energy. Give one example of a body which possesses kinetic energy.
How does the kinetic energy of a moving body depend on its (i) speed, and (ii) mass?
A bullet of mass 15 g has a speed of 400 m/s. What is its kinetic energy? If the bullet strikes a thick target and is brought to rest in 2 cm, calculate the average net force acting on the bullet. What happens to the kinetic energy originally in the bullet?
Explain the difference between potential energy and kinetic energy.
Find out the form of energy possessed by the following thing.
A rolling ball
When stored water falls down, potential energy of water is converted into ______.
If the mass as well as the velocity of a body is doubled then the kinetic energy of the body ______ the initial kinetic energy.
