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# How much work can be obtained from 100 calories of heat energy?

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By Expert Faculty of Sri Chaitanya
a
100 J
b
420 J
c
42 J
d
4200 J
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detailed solution

Correct option is B

1 calorie = 4.2J∴Work done = heat obtained in calories × 4.2Jor  W = 100 × 4.2 = 420 J

Similar Questions

A metal block of density 5000 kg/m3 and mass 2 kg is suspended by a spring of force constant 200 N/m. The spring block system is submerged in a water vessel. Total mass of water in it is 300 g and in equilibrium the block is at a height 40 cm above the bottom of vessel. If the support is broken. Find the rise in temperature of water (in oC). Specific heat of the initial of block is 250 J/kg K and that of water is 4200 J/kg K. Neglect the heat capacities of the vessel and the spring.

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