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प्रश्न
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संबंधित प्रश्न
An electron emitter must have _____________ work function and ___________ melting point.
Define the term energy.
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
The power of a motor is 40 kW. At what speed can the motor raise a load of 20,000 N?
State the energy transformation on the following:
Electricity is obtained from solar energy.
What do you mean by degradation of energy?
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?
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 SI unit of work?
A man carrying a suitcase in his hand is walking horizontally. What is the work done against gravity?
What do you mean by a kilo joule?
Write an expression for the work done against gravity.
________ is said to be done when a force is acting on it.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A wind-mill is lifting water from a well.
