Advertisements
Advertisements
प्रश्न
State the energy changes in the following case while in use:
Microphone
Advertisements
उत्तर
Sound energy into electrical energy.
APPEARS IN
संबंधित प्रश्न
State the energy changes in the following case while in use:
An electric iron
State the energy changes that occur in a watch spring while it unwinds.
State the energy changes in the following while using a microphone.
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.
State the energy changes in the following case while in use:
loudspeaker
State the energy changes in the following case while in use:
a steam engine
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.

The power of a motor pump is 2 kW. How much water per. the minute the pump can raise to a height of 10 m? (Given g = 10m s−2)
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)
