E) Thermal energy is released during
some energy conversions.
True or false ?
F) If enough heat energy is absorbed by a liquid, the liquid solidifies.
True or false ?
Solved
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Ответ:
e) True, f) False
Explanation:
e) Let consider a close system, that is, a system with no mass interactions with surroundings. Then, we get the following expression by the First Law of Thermodynamics:
Where:
Please notice that work comprises all kind of work (i.e. mechanical, electric, magnetic), whereas heat comprises all heat interactions including chemical and radioactive phenomena.
If thermal energy is released, then
, which is caused by three scenarios:
(i)
,
, ![|Q_{net,in}||W_{net,out}|](/tpl/images/1031/9375/4be18.png)
(ii)
,
, ![|Q_{net,in}|](/tpl/images/1031/9375/fc48b.png)
(iii)
, ![W_{net, out}0](/tpl/images/1031/9375/db9d4.png)
In the case
,
, the thermal energy of the system is increased. Therefore, thermal energy is released during some energy conversions. True
f) A liquid solidifies when temperature goes below point of fusion, meaning a realease of heat with no work interactions. That is:
If
, then
. Then, if a liquid absorbs heat energy, then thermal energy is increase and the liquid does not solidifies. False.
Ответ:
1) 5.83
2) 1.38
3) 4.22