Advertisements
Advertisements
प्रश्न
If an object has 0 momentum, does it have kinetic energy? Explain your answer.
Advertisements
उत्तर
Momentum of an object, P = mv
If P = 0
⇒ `"v" = 0`
This is because the mass of the object can never be 0.
Now, the kinetic energy of the object, `"K" = 1/2 xx "m" xx "v"^2`
Since, v = 0
⇒ K = 0
Hence, when the object has zero momentum, its kinetic energy is also zero.
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
The energy of a flying kite is kinetic energy.
Kinetic energy = 1/2 × mass × ............
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?
Give reasons for the following A horse and a dog are running with the same speed. Which one of them has more kinetic energy than the other.
A car is moving with a speed of 15 km h-1 and another identical car is moving with a speed of 30 km h-1. Compare their kinetic energy.
When an arrow is shot from a bow, it has kinetic energy in it. Explain briefly from where does it get its kinetic energy?
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?
If the speed of a body is halved, what will be the change in its kinetic energy?
A ball of mass 200 g falls from a height of 5 metres. What is its kinetic energy when it just reaches the ground? (g = 9.8 m/s2)
What do you understand by the kinetic energy of a body?
When a ball is thrown inside a moving bus, does its kinetic energy depend on the speed of the bus? Explain.
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?
Find out the form of energy possessed by the following thing.
A rolling ball
Explain the types of mechanical energy.
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.
Find the kinetic energy of a body of mass 5 kg moving with a uniform velocity of 10 m s-1.
