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प्रश्न
Define 1 J of work.
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उत्तर
1 J is the amount of work done by a force of 1 N on an object that displaces it through a distance of 1 m in the direction of the applied force.
संबंधित प्रश्न
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
When is work said to be done by a force?
Express joule in terms of erg.
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B does the same in 15 s. Compare the work done.
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.
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
How long should an electric motor, of power 2 H.P. operate, so as to pump 5 m3 of water from a depth of 15m. [Take g = 10 N kg−1]
