Advertisements
Advertisements
प्रश्न
What is the work done by the gravitational force on the moon that revolves around the earth?
Advertisements
उत्तर
The moon is revolving around the earth. In this process, the work done by the gravitational force is zero because the displacement of the moon is at the right angle to the gravitational force.
संबंधित प्रश्न
A coolie X Carrying a load on his head climbs up a slope and another coolie Y carrying the identical load on his head move the same distance on a frictionless horizontal platform. Who does more work? Explain the reason.
The work done by a fielder when he takes a catch in a cricket match, is negative. Explain.
What physical quantity does the electron volt (eV) measure? How is it related to the S.I. unit of that quality?
A body of mass m is moving with a uniform velocity u. A force is applied on the body due to which its velocity changes from u to v. How much work is being done by the force?
A man raises a box of mass 50 kg to a height of 2 m in 20s, while another man raises the same box to the same height in 50s. Calculated:
- the work done, and
- the power developed by each man. Take g = 10 N kg-1.
What happens to the power if the time for doing work is reduced from t second to t/10 second?
State the S.I. and C.G.S. units of energy. How are they related?
A force of 1 kgf displaces a body by a distance of 10 cm
(i) in direction of force,
(ii) normal to the force
(iii) at an angle of 60° to the direction of the force.
Calculate the amount of work done in each case. (Take: g = 9.8 ms−2 )
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person climbs a ladder.
