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प्रश्न
Name the device or machine which convert :
Light energy into electrical energy.
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उत्तर
A solar cell converts light energy into electrical energy.
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संबंधित प्रश्न
State the condition under which the mechanical energy is conserved.
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
- the potential energy at the greatest height,
- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
Is energy a vector quantity?
What kind of energy is possessed by the following?
A running car ____________
Name the device or machine which convert :
Mechanical energy into electrical energy.
Name the device or machine which convert :
Electrical energy into light energy.
Write the energy transformations which take place in an electric bulb (or electric lamp).
Name the energy transfers which occur when :
an electric ball rings
A ball falls to the ground as shown below :
Which law you have made use of in answering this question?
An automobile engine propels a 1000 kg car (A) along a levelled road at a speed of 36 km h–1. Find the power if the opposing frictional force is 100 N. Now, suppose after travelling a distance of 200 m, this car collides with another stationary car (B) of the same mass and comes to rest. Let its engine also stop at the same time. Now the car (B) starts moving on the same level road without getting its engine started. Find the speed of the car (B) just after the collision.
