Question

Express the change in internal energy of

a system when

(i) No heat is absorbed by the system

from the surroundings, but work (w)

is done on the system. What type of

wall does the system have ?

(ii) No work is done on the system, but

q amount of heat is taken out from

the system and given to the

surroundings. What type of wall does

the system have?

(iii) w amount of work is done by the

system and q amount of heat is

supplied to the system. What type of

system would it be?​

Answer 1

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Solution

(i) ∆ U = w ad, wall is adiabatic

(ii) ∆ U = – q, thermally conducting walls

(iii) ∆ U = q – w, closed system.

Answer 2

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