Advertisements
Advertisements
प्रश्न
When a ball is thrown inside a moving bus, does its kinetic energy depend on the speed of the bus? Explain.
When a ball is thrown inside a moving bus, does its kinetic energy depend on the speed of the bus?
Advertisements
उत्तर
The kinetic energy of a ball thrown inside a moving bus depends on the speed of the bus because the kinetic energy is directly proportional to the square of the speed of the moving ball. The speed of the bus adds up to the speed with which the ball is thrown inside the bus. Hence, more the speed of bus, higher will be the ball’s kinetic energy.
संबंधित प्रश्न
What is the kinetic energy of an object?
Write an expression for the kinetic energy of an object.
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?
A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?
Kinetic energy = 1/2 × mass × ............
Define the term kinetic energy. Give one example of a body which possesses kinetic energy.
State two factors on which the kinetic energy of a moving body depends.
A ball of mass M is moving with a speed v. What is its kinetic energy?
If the speed of a car is halved, how does its kinetic energy change?
A cannon ball of mass 500 g is fired with a speed of 15 m s-1. Find:
- its kinetic energy.
- its momentum.
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.
A body falls freely under gravity from rest. Name the kind of energy it will possess on reaching the ground.
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.
A man drops a 10 kg rock from the top of a 5 m ladder. What is its speed just before it hits the ground? What is its kinetic energy when it reaches the ground? (g = 10 m/s2)
What do you understand by the kinetic energy of a body?
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 :
The kinetic energy of a given body depends on the ______.
