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प्रश्न
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
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उत्तर
For work to be performed, energy must be transferred from one place to another/transformed from one type to another.
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संबंधित प्रश्न
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
The energy of a body is its capacity to do .........
State the energy transformation on the following:
Electricity is obtained from solar energy.
A person of mass 50 kg climbs a tower of height 72 metres. Calculate the work done. (g = 9.8 m s−2).
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.
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
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°?
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
Is the motion of moon around the earth in circular path an accelerated motion?
Define 'joule'.
Name the physical quantity associated with the 'rate of doing work'.
In what way does an ‘Ideal machine’ differ from a ‘Practical machine’?
Explain, why submarines are able to dive underwater as well as a sail on the surface of the water?
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.
What is power? How do you differentiate kilowatt from kilowatt-hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of waterfalls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g = 10 m s–2)
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
