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प्रश्न
The S.I. unit of work is
पर्याय
second
metre
joule
newton
उत्तर
joule
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संबंधित प्रश्न
Power spent by a body depends on the time for which it does work.
Work is said to be done by a forte only when ................
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
What is the condition for a force to do work on a body?
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
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 ratio of SI units to CGS units of 'work'?
A boy of mass m climbs up a staircase of vertical height h.
- What is the work done by the boy against the force of gravity?
- What would have been the work done if he uses a lift in climbing the same vertical height?
A 100 W electric lamp emits energy in the form of light at the rate 10 J per second. What percentage of electric energy does the lamp transform into light energy?
If an electric bulb of 100 watt is lighted for 2 hours, how much electric energy would be consumed?
Fill in the boxe to show the corresponding energy transformation.
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.
Can two agents, doing the same work, have different power?
In what way does an ‘Ideal machine’ differ from a ‘Practical machine’?
Mention whether work is done or not in the following activity.
| S. No | Activity | Work done or not done |
| 1. | Pushing the door | |
| 2. | Holding a doll | |
| 3. | Sitting in a bus | |
| 4. | Pushing a wall | |
| 5. | Digging soil |
A force can cause an object to change its ______.
