The coefficient of linear expansion of iron is 1.0 × 10−5 per C◦ . The surface area of an iron
cube, with an edge length of 5.0 cm, will increase by what amount if it is heated from 10◦ C to
60◦ C

Question

19-05-2017
Physics

contestada

The coefficient of linear expansion of iron is 1.0 × 10−5 per C◦ . The surface area of an iron
cube, with an edge length of 5.0 cm, will increase by what amount if it is heated from 10◦ C to
60◦ C

Respuesta :

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kgoodwin kgoodwin · Answer 1 · 2017-05-19T20:38:02+02:00

The maximum possible efficiency, i.e the efficiency of a Carnot engine , is give by the ratio of the absolute temperatures of hot and cold reservoir.
η_max = 1 - (T_c/T_h)

For this engine:
η_max = 1 - [ (20 +273)K/(600 + 273)K ] = 0.66 = 66%

The actual efficiency of the engine is 30%, i.e.
η = 0.3 ∙ 0.664 = 0.20 = 20 %

On the other hand thermal efficiency is defined as the ratio of work done to the amount of heat absorbed from hot reservoir:
η = W/Q_h

So the heat required from hot reservoir is:
Q_h = W/η = 1000J / 0.20 = 5000J

The coefficient of linear expansion of iron is 1.0 × 10−5 per C◦ . The surface area of an iron cube, with an edge length of 5.0 cm, will increase by what amount if it is heated from 10◦ C to 60◦ C

Respuesta :

Otras preguntas

The coefficient of linear expansion of iron is 1.0 × 10−5 per C◦ . The surface area of an iron
cube, with an edge length of 5.0 cm, will increase by what amount if it is heated from 10◦ C to
60◦ C