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 Charging of a battery.
Advertisements
Solution
Electrical energy changes into chemical energy.
APPEARS IN
RELATED QUESTIONS
State the energy changes in the following case while in use:
A ceiling fan
State the energy changes in the following while in use An electric bulb.
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
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.
A light and a heavy object have the same momentum. Find out the ratio of their kinetic energies. Which one has larger kinetic energy?
Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it.
(a) How much work is done by the men in lifting the box?
(b) How much work do they do in just holding it?
(c) Why do they get tired while holding it? (g = 10 m s–2)
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
