The First Law of Thermodynamics
AP Physics 2 · Flashcards · Application
AP PHYSICS 2 · FLASHCARDS
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QUESTION
What is the internal energy change if a closed system releases 50 J of heat and absorbs 50 J of heat?
QUESTION
Calculate
△
U
\triangle U
△
U
if
Q
=
−
20
J
Q = -20 \text{ J}
Q
=
−
20
J
and
W
=
10
J
W = 10 \text{ J}
W
=
10
J
.
QUESTION
Calculate work done by a system with
△
U
=
30
J
\triangle U = 30 \text{ J}
△
U
=
30
J
and
Q
=
40
J
Q = 40 \text{ J}
Q
=
40
J
.
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ANSWER
W
=
Q
−
△
U
=
40
J
−
30
J
=
10
J
W = Q - \triangle U = 40 \text{ J} - 30 \text{ J} = 10 \text{ J}
W
=
Q
−
△
U
=
40
J
−
30
J
=
10
J
. Rearranging the first law to solve for work done by system.
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