Advertisements
Advertisements
प्रश्न
What is the work done by the gravitational force on the moon that revolves around the earth?
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.
APPEARS IN
संबंधित प्रश्न
A body, when acted upon by a force of 10 kgf, gets displaced by 0.5 m. Calculate the work done by the force, when the displacement is (i) in the direction of force, (ii) at an angle of 60° with the force, and (iii) normal to the force. (g = 10 N kg-1)
A boy weighing 350 N climbs up 30 steps, each 20 cm high in 1 minute, Calculate:
- the work done and
- power spent.
What is meant by a rotatory motion? Give one example.
A man spends 7.4 kJ energy in displacing a body by 74 m in the direction in which he applies force, in 2.5 s. Calculate the power spent (in H.P) by the man.
Define 1 kgf., How is it related to the S.I. unit of force?
Give the units of couple.
What is the S.I. unit of work? Define it.
Calculate the work done when:
A car is moved on a rough road through 30 m against a frictional resistance of 75 N.
For the following scenarios, state whether the work done by gravity is positive, negative, or zero.
A person climbs a ladder.
