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प्रश्न
In the following case write yes, if the work is being done and no if no work is being done.
A man trying to push a wall.
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उत्तर
No.
संबंधित प्रश्न
Name the quality which is measured in kWh.
A body is provided at a point. A force of 20 N is applied at a distance of 40 cm from the pivot. Find the moment of force about the pivot.
How much force is applied on a body when 150 J of work is done in displacing the body through a distance of 10 m in the direction of the force?
A boy takes 3 minutes to lift a 20 litre water bucket from a 20 m deep well, while his father does it in 2 minutes. Compare:
- the work, and
- power developed by them.
In the following case write yes, if the work is being done and no if no work is being done.
A man moving on the rough ground.
State two conditions for work to be done.
State the S.I. and C.G.S. units of energy. How are they related?
Calculate the work done when:
A car is moved on a rough road through 30 m against a frictional resistance of 75 N.
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 )
A boy weighing 50 kgf climbs up from the first floor at a height of 3 m above the ground to the third floor at a height of 9 m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg-1).
