Advertisements
Advertisements
प्रश्न
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in the burning of a match stick.
Advertisements
उत्तर
Chemical energy changes into heat and light energy.
APPEARS IN
संबंधित प्रश्न
State the energy changes that occur in the following :
An electric generator (or dynamo).
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in a car going uphill.
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in respiration.
State the energy changes in the following case while in use:
loudspeaker
State the energy changes in the following case while in use:
An electromagnet.
A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. What happens to the mechanical energy after the ball hits the ground and comes to rest?
Explain conservation of energy.
A boy is moving on a straight road against a frictional force of 5 N. After travelling a distance of 1.5 km he forgot the correct path at a roundabout (Fig. 11.1) of radius 100 m. However, he moves on the circular path for one and half-cycle and then he moves forward up to 2.0 km. Calculate the work done by him.
Define watt. Express kilowatt in terms of joule per second. A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of 20 ms–1?
State the energy changes in the following case while in use:
An electric cell in a circuit
