2highpsi Posted July 11, 2008 Report Share Posted July 11, 2008 It has to do with the vaporization of some of the water at high temps bringing the volume down keep in mind, hotter water will not ALWAYS freeze faster. Just in the right conditions and temperatures Quote Link to comment Share on other sites More sharing options...
Guest Hal Posted July 11, 2008 Report Share Posted July 11, 2008 I was unaware we had so many engineers in here. Go back in your holes people. Quote Link to comment Share on other sites More sharing options...
MrMeanGreen Posted July 11, 2008 Report Share Posted July 11, 2008 I am an engineer, fucker. Electro-Mechanical, but dabble in quantum dynamics. See sig pic. Quote Link to comment Share on other sites More sharing options...
Guest Hal Posted July 12, 2008 Report Share Posted July 12, 2008 I am an engineer, fucker. Electro-Mechanical, but dabble in quantum dynamics. See sig pic. You're different. I'm speaking about the other idiots. Now get back in your hole. Quote Link to comment Share on other sites More sharing options...
Limitedslip7 Posted July 12, 2008 Report Share Posted July 12, 2008 Actually, I dabble in engineering too, mechanical though. How are you going to go about setting up this test? Remember the cooling/heating curves are logrithmic and approach a horizontal asymtote at delta T = 0, so this test could take a long time depending on cup size and temperature difference. Maybe you could track and plot the data points in Excel at like 5 min intervals? +-10 degrees would probably work good for starting points, but what would the variance be for human and measurement error? Might have to make the temps a little higher/lower... Stirring the water or a breeeze can have a big difference too, so try and minimize these variables or make them constant. This is going to be totally sweet... It doesn't say wether or not the cups have lids in the original post... sooo maybe we could go ahead and do that? Quote Link to comment Share on other sites More sharing options...
2highpsi Posted July 12, 2008 Report Share Posted July 12, 2008 I was an engineering major until I went to Athens.... shorty after I switched to programming Quote Link to comment Share on other sites More sharing options...
Guest Hal Posted July 12, 2008 Report Share Posted July 12, 2008 Actually, I dabble in engineering too, mechanical though. Interesting that you dabble in ME. I guess you shouldn't say "ME though". ME has a focus on thermodynamics and all the rest of that fun stuff. Quote Link to comment Share on other sites More sharing options...
Guest Hal Posted July 12, 2008 Report Share Posted July 12, 2008 I was an engineering major until I went to Athens.... shorty after I switched to programming So that makes you ______. A. Not an engineer. B. Not a Cobra. C. All of the above. Quote Link to comment Share on other sites More sharing options...
MrMeanGreen Posted July 12, 2008 Report Share Posted July 12, 2008 I vote "B". Quote Link to comment Share on other sites More sharing options...
El Karacho1647545492 Posted July 12, 2008 Report Share Posted July 12, 2008 the answer is 42. its sad that most people on this board won't understand that reference Quote Link to comment Share on other sites More sharing options...
MrMeanGreen Posted July 12, 2008 Report Share Posted July 12, 2008 You didn't ask the right question. Quote Link to comment Share on other sites More sharing options...
gillbot Posted July 12, 2008 Report Share Posted July 12, 2008 The hotter cup. The room has more mass of average temperature than the liquids. By design, molecules want to move faster within their realm of energy, so they "steal" heat to increase their movement, thus why things cool down. The room has a greater mass than the cup of cooler liquid, so the room's mass will steal the heat from the hot liquid of smaller mass, cooling it down quicker than a small mass cup of liquid trying to steal the heat from a room much bigger than itself. Not to mention the warmer cup's goal is to be "lazy" and shed it's energy. It's easier for an item to release energy as opposed to absorbing it. Quote Link to comment Share on other sites More sharing options...
2highpsi Posted July 12, 2008 Report Share Posted July 12, 2008 So that makes you ______. A. Not an engineer. B. Not a Cobra. C. All of the above. A little dumber than an engineer, and a little faster than a Cobra jk Quote Link to comment Share on other sites More sharing options...
2highpsi Posted July 12, 2008 Report Share Posted July 12, 2008 the answer is 42. its sad that most people on this board won't understand that reference Deep Thought tell you that? Quote Link to comment Share on other sites More sharing options...
customhillbilly Posted July 12, 2008 Report Share Posted July 12, 2008 neither cup will change temp. Your mom will drink them both, thirsty broad. Quote Link to comment Share on other sites More sharing options...
ImUrOBGYN Posted July 12, 2008 Report Share Posted July 12, 2008 Anthony and Rob are dead on. Afterwards, I skipped the rest of the posts as the question was answered. Eat me rest of you. Quote Link to comment Share on other sites More sharing options...
Limitedslip7 Posted July 15, 2008 Report Share Posted July 15, 2008 So, to continue beating the cooling horse. Jeffmeden, what do you think about condensation forming on the colder cup? Seeing how condensation is the opposite of evaporation, it releases the heat it took to evaporate it when it condenses. I would think it would also increase the efficiency of the thermal barrier it condenses on. I hypothesize that if we assume the OP's containers are not sealed, condensation could cancel out any potential gains evaporative cooling gives to the hotter cup. Quote Link to comment Share on other sites More sharing options...
Guest Hal Posted July 15, 2008 Report Share Posted July 15, 2008 Maybe I will do this test. I will try to keep the variables to a minimum. Quote Link to comment Share on other sites More sharing options...
Mowgli1647545497 Posted July 24, 2008 Report Share Posted July 24, 2008 The hot cup will reach room temperature first. and EVERYONE in the thread has gotten the explaination of the answer why wrong. <--- engineer with 2 actual real f**-ing degrees BS Astronautical Engineering BS Aeronautical Engineering Quote Link to comment Share on other sites More sharing options...
MrMeanGreen Posted July 24, 2008 Report Share Posted July 24, 2008 I have a degree in BS too. I'm right Quote Link to comment Share on other sites More sharing options...
2highpsi Posted July 24, 2008 Report Share Posted July 24, 2008 and EVERYONE in the thread has gotten the explaination of the answer why wrong. don't leave us hanging then.... what's the correct explaination Quote Link to comment Share on other sites More sharing options...
matris77 Posted July 24, 2008 Report Share Posted July 24, 2008 the answer is 42. its sad that most people on this board won't understand that reference Of course it is and I do. Quote Link to comment Share on other sites More sharing options...
Limitedslip7 Posted July 25, 2008 Report Share Posted July 25, 2008 The hot cup will reach room temperature first. and EVERYONE in the thread has gotten the explaination of the answer why wrong. <--- engineer with 2 actual real f**-ing degrees BS Astronautical Engineering BS Aeronautical Engineering Considering that the problem does not state if the cup is covered or not, or give any psychrometric data, how could you determine this other than NLoC? Seriously, I am very interested! I'm not taking heat transfer until this fall, so I only know the basics... Quote Link to comment Share on other sites More sharing options...
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