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(5673) Question Category: Mathematical Calculation

The element of an electric fire with an output of 1000​Watts is a cylinder of 250mm long and 15​mm ​ in diameter. If it behaves as a black body, estimate its temperature.

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(5674) Question Category: Short answers

Give two ways in which the internal energy of the system can be changed.

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(5675) Question Category: Short answers

List down two simple applications of the First law of thermodynamics in our daily life.

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(5676) Question Category: Mathematical Calculation

One mole of a gas expands from volume, V​1 to a volume V​2​ . If the gas obeys the
Van-der-Waal`s equation; (p+frac{a}{v^{2}})(v-b)=RT, derive the formula for work done in this process.

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(5677) Question Category: Mathematical Calculation

A heat engine works at two temperatures of 27°C and 227°C. Calculate the:
(i) Efficiency of the engine.
(ii) Temperature which will increase the efficiency by 10% if the room temperature is kept at 27°C.

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