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प्रश्न
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
उत्तर
The work done on a body moving in a circular path is zero.
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संबंधित प्रश्न
Power spent by a body depends on the time for which it does work.
A body, when acted upon by a force of 10 kgf, moves to a distance 0.5 m in the direction of force. Find the work done by the force. Take 1 kgf = 10 N.
A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
A force of 50 N acts on a body and moves it a distance of 4 m on horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
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?
Choose one or more correct alternatives.
For work to be performed, energy must be ______.
- transferred from one place to another
- concentrated
- transformed from one type to another
- destroyed
Is work done a scalar or a vector physical quantity?
Complete the following sentences:
Joule is the unit of .......
How fast should a boy weighting 30 kg run so that his kinetic energy is 375 joule?
A girl of mass 50 kg runs up a flight of 40 steps in 20 seconds. If each step in 20 cm high, calculate the power developed by the girl. (g= 10 ms-2).
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
Explain, why submarines are able to dive underwater as well as a sail on the surface of the water?
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 is a push or a pull ______.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Food grains are getting dried in the sun.
