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
The kinetic energy of an object of mass m moving with a velocity of 5 m s−1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?
The energy of a flying kite is kinetic energy.
A cyclist doubles his speed. How will his kinetic energy change: increase, decrease or remain same?
When an arrow is shot from a bow, it has kinetic energy in it. Explain briefly from where does it get its kinetic energy?
What is the kinetic energy of a body of mass 1 kg moving with a speed of 2 m/s?
How does the kinetic energy of a moving body depend on its (i) speed, and (ii) mass?
A horse and a dog are running with the same speed. If the weight of the horse is ten times that of the dog, What is the ration of their kinetic energies?
The momentum of a bullet of mass 20 g fired from a gun is 10 kg.m/s. The kinetic energy of this bullet in kJ will be :
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 ______.
