Current Events > Is anyone on CE smart enough to answer this thermodynamics problem?

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CrocodileCannon
09/24/19 5:44:38 PM
#1:


A refrigerator consumes 400 Watt of electrical power while removing 500 watt heat from the interior to keep it cold.

Calculate net heating rate caused to the room.
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Eevee-Trainer
09/24/19 5:52:25 PM
#2:


0.999... = 1
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CrocodileCannon
09/24/19 5:56:18 PM
#3:


it says wrong
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SapphireClassic
09/24/19 5:57:09 PM
#4:


100
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CrocodileCannon
09/24/19 6:39:15 PM
#5:


SapphireClassic posted...
100


already tried that. It was incorrect
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#6
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CrocodileCannon
09/24/19 6:45:51 PM
#7:


GregShmedley posted...
1,365.2 or 1706.5.


How did you come up with that?
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#8
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divot1338
09/24/19 6:47:35 PM
#9:


CrocodileCannon posted...
A refrigerator consumes 400 Watt of electrical power while removing 500 watt heat from the interior to keep it cold.

Calculate net heating rate caused to the room.

Is the refrigerator door open or closed?
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Tupacrulez
09/24/19 6:49:09 PM
#10:


CrocodileCannon posted...
A refrigerator consumes 400 Watt of electrical power while removing 500 watt heat from the interior to keep it cold.

Calculate net heating rate caused to the room.


That's one helluvan efficient fridge. It's drawing more energy out than its using!
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CrocodileCannon
09/24/19 6:49:15 PM
#11:


GregShmedley posted...
CrocodileCannon posted...
GregShmedley posted...
1,365.2 or 1706.5.


How did you come up with that?


Was either correct?


I haven't tried either yet I only have a few attempts left.

divot1338 posted...
CrocodileCannon posted...
A refrigerator consumes 400 Watt of electrical power while removing 500 watt heat from the interior to keep it cold.

Calculate net heating rate caused to the room.

Is the refrigerator door open or closed?


Closed...
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ToPoPO
09/24/19 6:50:37 PM
#12:


500
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JimCarrysToe
09/24/19 6:51:13 PM
#13:


42.69
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tullock
09/24/19 6:51:45 PM
#14:


Of that 400w draw, wouldn't you have to know how much of that is heat?
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nikko004
09/24/19 6:56:21 PM
#15:


wouldnt it just be 500W?
it just refers to the heating of the room, and the fridge must release 500w of heat from the interior to the room

i assume its not drawing 400w of heat from the room
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#16
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SiO4
09/24/19 7:30:41 PM
#17:


Tupacrulez posted...
CrocodileCannon posted...
A refrigerator consumes 400 Watt of electrical power while removing 500 watt heat from the interior to keep it cold.

Calculate net heating rate caused to the room.


That's one helluvan efficient fridge. It's drawing more energy out than its using!


This plus the other parameters. Such as Watts Per Hour, or what.
Also how clean is the discharge etc.

But ya, 400, in and 500 out is pretty good.

Also, I'm not used to hearing thermodynamics being rated in Watts to often.
I understand it is a measure of energy, but still.
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tullock
09/24/19 7:52:40 PM
#18:


The heat is also being removed from the interior of the fridge which will probably have almost no effect on the rest of the room
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Garioshi
09/25/19 1:48:39 PM
#19:


400, the heat in the fridge doesn't leave the room

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teepan95
09/25/19 1:55:15 PM
#20:


900?

The heat taken out of the interior goes into the room, and I'm assuming the electrical power eventually dissipates into heat too
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Sackgurl
09/25/19 1:56:56 PM
#21:


the answer is 900
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Garioshi
09/25/19 3:38:26 PM
#22:


teepan95 posted...
900?

The heat taken out of the interior goes into the room, and I'm assuming the electrical power eventually dissipates into heat too
The fridge is also in the room.

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teepan95
09/25/19 10:56:49 PM
#23:


Garioshi posted...
teepan95 posted...
900?

The heat taken out of the interior goes into the room, and I'm assuming the electrical power eventually dissipates into heat too
The fridge is also in the room.

The wording implies the control volume is the room without the fridge interior
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BuckVanHammer
09/25/19 11:01:23 PM
#24:


total guess, but net heating rate seems to be a formula you plug these numbers into. what that could be i do not know...
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