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प्रश्न
Name the physical quantity whose MKS units are kgm2s-3.
उत्तर
Power
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संबंधित प्रश्न
A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.
(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
The power of a motor is 40 kW. At what speed can the motor raise a load of 20,000 N?
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
Define the term 'work'. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.
A max X goes to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?
What is the work done when the object acted upon by a force remains at rest?
A man carrying a suitcase in his hand is walking horizontally. What is the work done against gravity?
Give an example
Electrical energy changes of sound energy.
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
Name the material commonly used for the manufacturing of solar cells.
What should be the characteristic of a source of energy?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A wind-mill is lifting water from a well.
