Advertisements
Advertisements
प्रश्न
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)
Advertisements
उत्तर
Here, power of the motor pump, P = 2 kW
= 2000 W
Height to which water is raised, h = 10 m
As `("mgh")/"t"` or `"pt"/"gh"`
∴ Water raised per minute (= 60 s)
`(2000 xx 60)/(10 xx 10)`
= 200
APPEARS IN
संबंधित प्रश्न
State the energy changes in the following case while in use:
A ceiling fan
State the energy changes in the following while using a microphone.
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 the unwinding of a watch spring.
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in a loaded truck when started and set in motion.
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.
State the energy changes in the following case while in use:
Washing machine
A rocket is moving up with a velocity v. If the velocity of this rocket is suddenly tripled, what will be the ratio of two kinetic energies?
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)
For burning of coal in a thermoelectric station, the energy conversion taking place is:
