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प्रश्न
When do we say that work is done?
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उत्तर
- When a force operates on an object and causes it to be displaced from its original location, it produces work.
- A force acts on the body.
- There is a displacement of the body caused by the applied force along the direction of the applied force.
संबंधित प्रश्न
In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
A coolie does no work against the force of gravity while carrying a luggage on a road.
What are the two kinds of mechanical energy?
What happens to the work done when the dispacement of body is at right angles to the direction of force acting on it? Explain your answer.
How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
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What are the advantages and disadvantages of using solar cells for producing electricity?
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).
