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DE: Unit Cancellations Not Making sense 
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#1
Jan3011, 08:02 PM

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1. The problem statement, all variables and given/known data
Consider a tank used in certain hydrodynamic experiments. After one experiment the tank contains 200 liters of a dye solution with a concentration of 1 g/liter. To prepare for the next experiment, the tank is to be rinsed with fresh water flowing in at a rate of 2 liters/min, the wellstirred solution flowing out at the same rate. Find the time that will elapse before the concentration of dye in the tank reaches 1% of its original value. 2. Relevant equations [tex]\frac{dQ}{dt}[/tex]=rate in  rate out 3. The attempt at a solution Why the heck do they cancel units incorrectly? 


#2
Jan3011, 08:28 PM

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Hard to say until you tell us what the heck Q is.



#3
Jan3011, 08:30 PM

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Q is the amount of dye in the tank.
dQ is the rate of change of the amount of dye in the tank. 


#4
Jan3011, 08:37 PM

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DE: Unit Cancellations Not Making sense



#5
Jan3011, 08:39 PM

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Ok that's what I was hoping  thank you.



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