Advertisements
Advertisements
प्रश्न
A body of mass m falls down through a height h. Obtain an expression for the work done by the force of gravity.
Advertisements
उत्तर
Assume that a body A with mass'm' is elevated 'h' above the ground, and B falls.
Force acting on 'm' at A is mg force of gravity.
Displacement = height = h
Work done in falling W = force × displacement
W = mg × h
The formula for the amount of work that gravity has done is W = mgh.
APPEARS IN
संबंधित प्रश्न
State different forms of potential energy and give one example of each.
Select the renewable and non-renewable sources of energy from the following:
Oil
What is tidal? Explain in brief.
State two disadvantages of producing electricity from solar energy.
MULTIPLE CHOICE TYPE:
The ultimate source of energy is:
(a) wood
(b) wind
(c) water
(d) sun
State two advantages and two disadvantages of using hydro-energy for producing electricity.
Give one example when:
Electrical energy to heat energy.
What is meant by energy?
What are the small particles that can be seen in a beam of light that enters a dark room?
