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प्रश्न
Give an example
Electrical energy changes to heat energy.
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उत्तर
Electric iron
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संबंधित प्रश्न
Define 1 J of work.
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.
A box of weight 150 kgf has gravitational potential energy stored in it equal to 14700 J. Find the height of the box above the ground. (Take g = 9.8 N kg-1)
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
Define 'joule'.
Give two examples of work done.
A boy of mass m climbs up a staircase of vertical height h.
- What is the work done by the boy against the force of gravity?
- What would have been the work done if he uses a lift in climbing the same vertical height?
Can work done be zero even if force acts on the body?
A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.
