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प्रश्न
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
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उत्तर
The work done on a body moving in a circular path is zero.
संबंधित प्रश्न
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.
A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:
- energy spent by machine,
- power at which the machine works.
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
State the SI unit of work.
What are the units of (a) work, and (b) energy?
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
A boy throws a rubber ball vertically upwards. What type of work, positive or negative, is done : by the force applied by the boy?
(a) by the force applied by the boy?
(b) by the gravitational force of earth?
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.
Is the motion of moon around the earth in circular path an accelerated motion?
What is the ratio of SI units to CGS units of 'work'?
Can work done be zero even if force acts on the body?
Name the physical quantity associated with the 'rate of doing work'.
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
Is power a scalar or a vector quantity?
What are the advantages and disadvantages of using solar cells for producing electricity?
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]
