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Ch. 8 #15 Part d

Posted: Mon Jan 15, 2018 1:43 pm
by Michelle Dong 1F
In an adiabatic process, no energy is transferred as heat. Indicate whether each of the following statements about an adiabatic process in a closed system is always true, always false, or true in certain conditions (specify the conditions):

(d) delta U=q
Why is this true when w=0? I thought it's always false because there is no energy transferred as heat so q must be 0, so the equation must be either delta U=0 or delta U=w?

Re: Ch. 8 #15 Part d

Posted: Mon Jan 15, 2018 2:03 pm
by Yashaswi Dis 1K
The way I understood was that there can be heat present in the system already but no further heat transfer is allowed; only work energy is transferable. Since delta U = q + w, then U = q if w = 0.

Hope that helps!

Sincerely,
Yashwi

Re: Ch. 8 #15 Part d

Posted: Mon Jan 15, 2018 5:10 pm
by snehabhargava
This is true when w=0 because q has to be 0 so it is only true when both q is 0 and w is 0.