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प्रश्न
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.
उत्तर
- A wind-mill works against the gravitational force to lift water.
- Hence, work is done by the wind-mill in lifting water from the well.
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संबंधित प्रश्न
A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?
Power spent by a body depends on the time for which it does work.
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?
No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
Is power a scalar quantity?
Can work done be zero even if force acts on the body?
If an electric bulb of 100 watt is lighted for 2 hours, how much electric energy would be consumed?
Define energy and state the unit of energy and the law of conservation of energy.
Give an example
Electrical energy changes to heat energy.
Why is less effort needed to lift a load over an inclined plane as compared to lifting the load directly?
An electric motor pump is 60% efficient and is rated 2.5 H.P. Calculate the maximum load it can lift through a height of 10m in 8 sec. (1 H.P. = 750 W).
A bucketful of water is to be drawn from a well ______ will be done when a ______ is applied to do this because there will be a ______ of water.
(displacement, work, force)
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
