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संबंधित प्रश्न
A boy of mass m climbs up a staircase of vertical height h.
(a) What is the work done by the boy against the force of gravity?
(b) What would have been the work done if he uses a lift in climbing the same vertical height?
Write an expression for the potential energy of a body of mass m placed at a height h above the earth's surface. State the assumptions made, if any.
What is wind energy?
State the energy transformation on the following:
Electricity is obtained from hydro energy.
Show that the quantity 2K/v2 has the unit of mass, where K is the kinetic energy of the body.
Write the type of energy possessed in the following case:
A wound-up spring
Give one example when:
Mechanical energy changes to electric energy.
A boy sits and stands repeatedly. Draw a graph showing the variation of potential energy with time.
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.
Unit of calorific value of a substance is ____________.
