Advertisements
Advertisements
प्रश्न
The kinetic energy of a given body depends on the ______.
विकल्प
position
center of gravity of the body
momentum
displacement
Advertisements
उत्तर
The kinetic energy of a given body depends on the momentum.
Explanation:
Kinetic energy is the energy of motion and is mathematically defined as half the product of an object’s mass and the square of its velocity. Momentum is defined as the product of an object’s mass and velocity; since velocity is a key component of both formulas, kinetic energy directly depends on an object’s momentum.
संबंधित प्रश्न
Kinetic energy = 1/2 × mass × ............
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.
If the speed of a car is halved, how does its kinetic energy change?
Two bodies have masses in the ratio 5 : 1 and their kinetic energies are in the ratio 125 : 9. Calculate the ratio of their velocities.
If the speed of a body is halved, what will be the change in its kinetic energy?
Find the momentum of a body of mass 100 g having a kinetic energy of 20 J.
On a level road, a scooterist applies brakes to slow down from a speed of 10 m/s to 5 m/s. If the mass of the scooterist and the scooter be 150 kg, calculate the work done by the brakes. (Neglect air resistance and friction)
An apple falling from a tree is an example for kinetic energy.
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.
