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प्रश्न
Give an example
Light energy changes to electrical energy.
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उत्तर
Solar cell
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संबंधित प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
A force of 50 N acts on a body and moves it a distance of 4 m on horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
The work done by a force acting obliquely is given by the formula : W = F cos θ ✕ s. What will happen to the work done if angle θ between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant.
Why is the work done on an object moving with uniform circular motion zero?
No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
Fill in the boxe to show the corresponding energy transformation.
A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate: the speed of the body.
In the following case write yes, if the work is being done and no if no work is being done.
A coolie standing with a heavy load on his head
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
