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Give one example when:
Chemical energy changes to light energy.
Concept: undefined >> undefined
Give one example when:
Electric energy changes to mechanical energy.
Concept: undefined >> undefined
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Give one example when:
Mechanical energy changes to electric energy.
Concept: undefined >> undefined
Give one example when:
Potential energy changes to electric energy.
Concept: undefined >> undefined
Give one example when:
Electric energy changes to potential energy.
Concept: undefined >> undefined
Give one example when:
Mechanical energy to heat energy.
Concept: undefined >> undefined
Give one example when:
Kinetic energy to potential energy.
Concept: undefined >> undefined
Give one example when:
Electrical energy to heat energy.
Concept: undefined >> undefined
Give one example when:
Chemical energy to electrical energy.
Concept: undefined >> undefined
A boy sits and stands repeatedly. Draw a graph showing the variation of potential energy with time.
Concept: undefined >> undefined
Draw a diagram to show the energy changes in an oscillating simple pendulum. Indicate in your diagram how the total mechanical energy in it remains constant during the oscillation.
Concept: undefined >> undefined
What is the form of that graph between
(i) K.E. and velocity for a constant mass?
(ii) K.E. and mass for a constant velocity?
Concept: undefined >> undefined
Show that in case of a body falling freely under gravity, total mechanical energy remains conserved (neglect air resistance).
Concept: undefined >> undefined
What is nuclear energy? Explain the principle of producing electricity using nuclear energy is a nuclear reactor.
Concept: undefined >> undefined
Calculate the change in the Kinetic energy of a moving body if its velocity is reduced to 1/3rd of the initial velocity.
Concept: undefined >> undefined
A girl of mass 35 kg climbs up from the first floor of a building at a height 4 m above the ground to the third floor at a height 12 m above the ground. What will be the increase in her gravitational potential energy? [g = 10 ms-2]
Concept: undefined >> undefined
A body of mass 0.2 kg falls from a height of 10 m to a height of 6 m above the ground. Find the loss in potential energy taking place in the body. [g = 10ms−2]
Concept: undefined >> undefined
A ball of mass 200 g falls from a height of 5 m. What will be its kinetic energy when it just reaches the ground? (g = 9.8 m s−2)
Concept: undefined >> undefined
Two bodies, A and B of equal mass are kept at heights 20 m and 30 m respectively. Calculate the ratio of their potential energies.
Concept: undefined >> undefined
A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?
Concept: undefined >> undefined
