Energy cannot be destroyed or created, but energy could be transformed or transferred. For example a skiier skiing from the mouth can have potential energy transferred into kinetic energy.
Solution :
Given :
Initial temperature of the refrigerant is :

= ( 39.37 + 273 ) K
= 312.3 K
Room which is maintained at constant temperature is :

= (22+273) K
= 295 K
The thermal energy transferred to the room is :
Q = 400 kJ
= 
Therefore, the total entropy generation during the thermal energy process is :
![$\Delta S =\left[\frac{-Q}{T_i}+ \frac{+Q}{T_i}\right]$](https://tex.z-dn.net/?f=%24%5CDelta%20S%20%3D%5Cleft%5B%5Cfrac%7B-Q%7D%7BT_i%7D%2B%20%5Cfrac%7B%2BQ%7D%7BT_i%7D%5Cright%5D%24)
Here, -Q = heat is leaving the system maintained at a temperature of
K.
+Q = heat is entering the system maintained at a temperature of
K.
Therefore, substituting the values :
![$\Delta S =\left[\frac{-400\times 10^3}{312.3}+ \frac{400\times 10^3}{295}\right]$](https://tex.z-dn.net/?f=%24%5CDelta%20S%20%3D%5Cleft%5B%5Cfrac%7B-400%5Ctimes%2010%5E3%7D%7B312.3%7D%2B%20%5Cfrac%7B400%5Ctimes%2010%5E3%7D%7B295%7D%5Cright%5D%24)
= [-1280.8197 + 1355.9322]
= 75.1125 J/K
= 0.0751125 kJ/K
= 0.075 kJ/K
Answer:
Final temperature of the gas = -146.63 °C
Explanation:
At constant pressure, volume and temperature of the gases are related as:

Where,
V1 = Initial volume = 1.00 L
V2 = Final volume = 2.40 L
T1 = Initial temperature = 30.5 °C = 30.5 + 273.15 = 303.65 K
Now, substitute the values in the above equation,



T2 = 126.52 K
The conversion of T( °C) to T(K) is shown below:
T(K) = T( °C) + 273.15
T( °C) = T(K) - 273.15
= 126.52 - 273.15 = -146.63 °C
Answer:Serkan teacher regularly buys 75 TL of gasoline in his car every week.
At the end of the 13th week, how much is the total gasoline expenditure made by the serkan teacher?
A)390 B)420 C)900 D)975
Explanation: