Energy Transformation

How sound is produced in a radio or television?

During rocket lift off the chemical energy is converted to gravitational potential energy and kinetic energy.

During Rocket's lift off the energy in the fuel is of 

In a simple Pendulum the displacement is equal to amplitude. Then kinetic energy will be

What is the meaning of law of conservation of energy?

The diagram shows an object released from point $X$ and travelling on a frictionless track. If a heavier object is taken in consideration then:

(i) It will move with a greater speed at $Y$.
(ii) The speed of the object at $M$ is $10 {\mathrm{ms}}^{-1}$.

Identify the device that works by carrying out the opposite energy transformation.

Identify the energy transfers that occur in the following device.

Identify the energy transfers that occur in the following device. Identify the device that works by carrying out the opposite energy transformation.

Identify the energy transfers that occur in the following device.

A car travels along a flat road. It has $50 \mathrm{billion} \mathrm{J}$ of kinetic energy. Every second, air resistance and other frictional forces cause it to lose$1 \mathrm{billion} \mathrm{J}$  of energy. If the car is to travel at a constant speed, how much energy will the engine have to convert to kinetic energy every second?

A toy car has a kinetic energy of $10 \mathrm{J}$. It rolls up a slope and at the top it has $3 \mathrm{J}$ of gravitational potential energy and $5 \mathrm{J}$ of kinetic energy. How much energy has the car lost through friction?

When a driver wants to stop a car, he presses the brake pedal. The brakes applied, which use friction to slow the car to a stop. Which of the following energy transformations occurs as a car brakes?

A driver parks his car on a hill but forgets to put brakes on. The car starts to roll down the hill. Which of the following energy transformation occurs as the car rolls down the hill?

There is a slight temperature difference between the waterfall at the top and at the bottom because

The system is released from rest with both the spring in unstretched positions. Mass of each block is 1 kg and force constant of each spring is 10 N/m.

In the equilibrium position, speed of the block placed horizontally is

A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?

State and prove law of conservation of energy.

State the energy conversion taking place in an electric cell.

Give one example of the following transformation:

Mechanical energy into electrical energy