Model Energy Transfer Between Objects
Physics · Flashcards · Application
PHYSICS · FLASHCARDS
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QUESTION
Identify the energy transfer: a moving box slows on a rough floor; where does its kinetic energy go?
QUESTION
Find
η
\eta
η
if
E
i
n
=
200
J
E_{in}=200\,\text{J}
E
in
=
200
J
and
E
u
s
e
f
u
l
=
50
J
E_{useful}=50\,\text{J}
E
u
se
f
u
l
=
50
J
for a device.
QUESTION
Find the heat gained:
m
=
2
kg
m=2\,\text{kg}
m
=
2
kg
,
c=500\,\text{J/(kg\cdot ^\circ C)}
,
Δ
T
=
5
∘
C
\Delta T=5\,^\circ\text{C}
Δ
T
=
5
∘
C
; what is
Q
Q
Q
?
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ANSWER
5000
J
5000\,\text{J}
5000
J
. Use
Q
=
m
c
Δ
T
Q=mc\Delta T
Q
=
m
c
Δ
T
:
(
2
)
(
500
)
(
5
)
=
5000
J
(2)(500)(5)=5000\,\text{J}
(
2
)
(
500
)
(
5
)
=
5000
J
.
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