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प्रश्न
What do you mean by uniform circular motion?
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उत्तर
When a particle moves with a constant speed in a circular path, its motion is said to be the uniform circular motion.
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संबंधित प्रश्न
When does a force do work?
State the condition when a force produces
(i) linear motion.
(ii) rotational motion, in a body.
A man raises a box of mass 50 kg to a height of 2 m in 20s, while another man raises the same box to the same height in 50s. Calculated:
- the work done, and
- the power developed by each man. Take g = 10 N kg-1.
What is the S.I. unit of work? Define it.
What happens to the power if the time for doing work is reduced from t second to t/10 second?
A coolie carrying a load on his head and moving on a frictionless horizontal platform does no work. Explain the reason why.
A machine raises a load of 750 N through a height of 16 m in 5 seconds. Calculate the power at which the machine works.
A man weighing 700 N runs up a flight of 15 steps, each 20 cm high, in 5 seconds. Calculate the power of the man.
A force of 1 kgf displaces a body by a distance of 10 cm
(i) in direction of force,
(ii) normal to the force
(iii) at an angle of 60° to the direction of the force.
Calculate the amount of work done in each case. (Take: g = 9.8 ms−2 )
