* PROVIDE EXPLANATION 1) Some liquid water is heated so that it becomes superhea

ID: 1859342 • Letter: #

Question

* PROVIDE EXPLANATION

1) Some liquid water is heated so that it becomes superheated vapor. Do I need "u" or "h" in the energy equation?

2) An ideal gas in a piston/cylinder is heated with 2 kJ during an isobaric process, is the work

positive, negative, or zero?

3) A 500-W electric space heater with a small fan inside heats air by blowing it over a hot

electrical wire. For each system: (a) wire only, (b) all the room air, and (c) total room plus the

heater, specify the storage, work, and heat transfer terms as +500 W, -500 W, or 0 (neglect any

heat transfer through the room walls or windows).

a ) h is used for constant pressure..so u will be used

b ) when heat is added, the volume will increase..work = PdV= positive

c) for the wire- heat transfer= -500 J

the room air= heat added= 500 J

total room = no exchange heat from surroundings= 0

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