Advertisements
Advertisements
प्रश्न
What is the SI unit of work?
उत्तर
Joule
APPEARS IN
संबंधित प्रश्न
A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s. Calculate:
- the work done, and
- the power developed by him. Take g = 10 N kg-1
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
In which of the following case the work done by a force will be maximum : when the angle between the direction of force and direction of motion is 0° or 90°?
In case of negative work, the angle between the force and displacement is :
What is the relationship between Nm and dyne cm?
On what factors does the work done by a force depend?
Complete the following sentences:
The SI unit of work is ....... and of power is .......
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
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?
State the energy changes which take place when Water stored in the dam is used to turn turbine in dynamo.
A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate: the speed of the body.
What should be the characteristic of a source of energy?
________ is said to be done when a force is acting on it.
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 of F = (5y + 20) `hat"j"` N acts on a particle. The work done by this force when the particle is moved from y = 0 m to y = 10 m is ______ J.
