C$2.$ As shown, water flows steadily

through two systems. In system A$,$

thermal energy is transferred to

the water through the pipe wall. In

system B$,$ a pump is installed

which increases the pressure of

the water. Which of the following

statements correctly describes

howhe pipe and pump change the

enthalpy and internal energy of

Svelelus:

tetipetature isxerems

Systeimi:

presture iilcresss

the flowing water?

$($A$.)$ systems A and B both increase enthalpy and internal energy

$($B$.)$ system A increases internal energy but not enthalpy; system B increases enthalpy but not

internal energy

$($C$.)$ system A increases both enthalpy and internal energy; system B increases enthalpy but

not internal energy

$($D$.)$ system A increases both enthalpy and internal energy; system B doesn't increase either

internal energy or enthalpy

C$3.($refering to C $2)$ this is because:

$($A$).)$ internal energy and enthalpy are closely related so that if one increases, so does the other

$($B$.)$ internal energy is a function of both temperature and pressure for liquids

$($C$.)$ enthalpy can increase with an increase in either temperature or pressure

$($D$.)$ no energy change occurs if the temperature remains constant