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प्रश्न
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
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उत्तर
Work is measured as a product of force and distance.
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संबंधित प्रश्न
Power spent by a body depends on the time for which it does work.
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1 H.P. = ........ W.
Fill in the boxe to show the corresponding energy transformation.

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A truck driver can load oil drums into the back of the truck by pushing them up a sloping plank, or by lifting them directly. Each drum has a mass of 80 kg, the plank is 3 m long, and the back of the truck is 0.8 m above the ground.

(i) How much force would be needed to lift a drum into the truck directly/without using the plank? (Take g = 10 m/s2)
(ii) How much energy would be required in lifting the drum into the truck without the plank?
(iii) If the force needed to push the drum up the plank is 300 N, why is this less than the answer to part (i)?
(iv) When the truck is loaded, the driver drives off. List the major energy changes that take place in moving the truck.
(v) The driver has to stop at the factory gates. What happens to the kinetic energy of the truck?
Write the two main conditions are needed for work to be done?
