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प्रश्न
Name the device or machine which convert :
light energy into heat energy.
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उत्तर
A solar water heater converts light energy into heat energy.
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संबंधित प्रश्न
A body falls freely under gravity from rest. Name the kind of energy it will possess while falling.
A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. Taking g = 10 m s−2, calculate:
- the potential energy possessed by the ball when it is initially at rest.
- the kinetic energy of the ball just before it hits the ground?
What are the various forms of energy?
Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.
Name the device which converts electrical energy into mechanical energy.
Name the device or machine which convert :
Chemical energy into electrical energy.
How much electrical energy in joules does a 100 watt lamp consume : in 1 minute?
Five electric fans of 120 watts each are used for 4 hours. Calculate the electrical energy consumed in kilowatt-hours.
How much energy does a 100 W electric bulb transfer in 1 minute?
A girl with having a mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of 4 m s–1 by applying a force. The trolley comes to rest after traversing a distance of 16 m. (a) How much work is done on the trolley? (b) How much work is done by the girl?
