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A body of mass 10 kg falls from a height of 20 m to 8 m. Calculate:
- the loss in potential energy of the body, and
- the total energy possessed by the body at any instant? (Take g = 10 m s-2)
Concept: undefined >> undefined
An electric iron is rated 220 V, 2 kW. If the iron is used for 3h daily find the cost of running it for one week if it costs ₹ 4.25 per kWh.
Concept: undefined >> undefined
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State the energy changes in the following case while in use:
An electric iron
Concept: undefined >> undefined
State the energy changes in the following case while in use:
A ceiling fan
Concept: undefined >> undefined
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.
Concept: undefined >> undefined
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.
Concept: undefined >> undefined
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.
Concept: undefined >> undefined
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.
Concept: undefined >> undefined
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.
Concept: undefined >> undefined
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in respiration.
Concept: undefined >> undefined
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.
Concept: undefined >> undefined
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in the Explosion of crackers.
Concept: undefined >> undefined
State the energy changes in the following case while in use:
loudspeaker
Concept: undefined >> undefined
State the energy changes in the following case while in use:
a steam engine
Concept: undefined >> undefined
State the energy changes in the following case while in use:
Microphone
Concept: undefined >> undefined
State the energy changes in the following case while in use:
Washing machine
Concept: undefined >> undefined
State the energy changes in the following case while in use:
Burning coal
Concept: undefined >> undefined
State the energy changes in the following case while in use:
A solar cell
Concept: undefined >> undefined
State the energy changes in the following case while in use:
Bio-gas burner
Concept: undefined >> undefined
State the energy changes in the following case while in use:
A petrol engine of a running car
Concept: undefined >> undefined
