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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.
उत्तर
Chemical energy changes into heat and light energy.
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संबंधित प्रश्न
State the energy changes in the following case while in use:
An electric iron
State the energy changes in the following case while in use:
A ceiling fan
State the energy changes in the following while in use A loudspeaker .
State the energy changes that occur in the following :
An electric generator (or dynamo).
State the energy changes in the following case while in use:
A solar cell
State the law of conservation of energy.
What is law of 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.
The velocity of a body moving in a straight line is increased by applying a constant force F, for some distance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equal to the work done by the force on the body.
If an electric iron of 1200 W is used for 30 minutes every day, find electric energy consumed in the month of April.
