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प्रश्न
State the energy changes which take place when:
In a heat engine.
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उत्तर
The heat energy changes to mechanical energy.
संबंधित प्रश्न
State two advantages of geothermal energy.
State two disadvantages of using wind energy for generating electricity.
A ball of mass 0.5 kg slows down from a speed of 5m/s-1 to that of 3m/s-1. Calculate the change in kinetic energy of the ball.
What is the main energy transformation that occur in:
Charging of a battery.
Give two examples each of renewable and non-renewable sources of energy?
Draw a diagram to show the energy changes in an oscillating simple pendulum. Indicate in your diagram how the total mechanical energy in it remains constant during the oscillation.
A body of mass 0.2 kg falls from a height of 10 m to a height of 6 m above the ground. Find the loss in potential energy taking place in the body. [g = 10ms−2]
A body of mass m is taken from a height h to 2h. What is the increase in its potential energy?
A ball of mass 50 g falls from a height of 2m and rebounds from the ground to 1.6 m. Find:
(i) The potential energy possessed by the ball when initially at rest.
(ii) The kinetic energy of the ball before it hits the ground.
(iii) The final potential energy of the ball.
(iv) The loss in kinetic energy of the ball on collision. (Take: g = 10N kg−1)
What are the small particles that can be seen in a beam of light that enters a dark room?
