Advertisements
Advertisements
Question
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in the unwinding of a watch spring.
Advertisements
Solution
The hands of a watch use the elastic potential energy saved during the unwinding of a clock. The potential energy of a wound-up spring converts into kinetic energy.
APPEARS IN
RELATED QUESTIONS
State the energy changes in the following while in use An electric oven.
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in photosynthesis in green leaves.
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in the Charging of a battery.
State the energy changes in the following case while in use:
loudspeaker
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?
Avinash can run with a speed of 8 m s–1 against the frictional force of 10 N, and Kapil can move with a speed of 3 m s–1 against the frictional force of 25 N. Who is more powerful and why?
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.
Can any object have mechanical energy even if its momentum is zero? Explain.
A light and a heavy object have the same momentum. Find out the ratio of their kinetic energies. Which one has larger kinetic energy?
State the energy changes in the following case while in use:
An electric cell in a circuit
