Advertisements
Advertisements
प्रश्न
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?
Advertisements
उत्तर
Kinetic energy of a moving body is directly proportional to its mass. Hence, if the mass of the horse is 10 times the mass of the dog, then,
`"(Kinetic energy)"_"Horse"/"(Kinetic energy)"_"Dog" = 10/1`
APPEARS IN
संबंधित प्रश्न
A ball of mass M is moving with a speed v. What is its kinetic energy?
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.
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.
On what factors does the kinetic energy of a body depend?
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)
A body of 2 kg falls from rest. What will be its kinetic energy during the fall at the end of 2 s? (Assume g = 10 m/s2)
Find out the form of energy possessed by the following thing.
Water falls
A car of mass 120 kg is moving at a speed 18 km/h and it accelerates to attain a speed of 54 km/h in 5 seconds. Calculate:
- the work done by the engine.
- the power of the engine.
When a bell fixed on a cycle rings, then the energy conversion that takes place is ______.
The kinetic energy of a given body depends on the ______.
