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प्रश्न
What is the SI unit of work?
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उत्तर
Joule
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संबंधित प्रश्न
Find the kinetic energy of a body of mass 1 kg moving with a uniform velocity of 10 m s-1.
Is work a scalar or a vector quantity?
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
A man lifts a mass of 10 kg from the floor to a shelf 4 meter high. If g = 10 ms-2, what is the work done?
What is the ratio of SI units to CGS units of 'work'?
An electric motor drives a machine which lifts a mass of 4 kg through a height of 10 m in 5 s at a constant speed. Assuming g = 10 ms-2, calculate
(i) the amount of work done, (ii) the power of the machine.
A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m long on to a platform, 2.5 m above the ground.
(i) Calculate the mechanical advantage of the inclined plane. (ii) Calculate the effort applied by the coolie.
(iii) In actual practice, the coolie needs to apply more effort than what is calculated. Give one reason why you think the coolie needs to apply more effort.
