Crap GadgetsWe wanted a monkey butler and bought one off eBay. Imagine our surprise when we found it was just an ordinary monkey with rabies. Worse: It had no butler training at all. Tell us about your duff technology purchases.
Thanks to Moonbadger for the suggestion
(
Scaryduck LIKES EGG, Thu 29 Sep 2011, 12:51)
« Go Back | See The Full Thread
Let's do the mathsUSB ports can supply 5v, 0.5A. That's 2.5W.
A typical cup of coffee is 250ml of something with a density of 1kg/l and a specific heat capacity of 4200 J/kgK. Put that together and your cup of coffee has a heat capacity of 1050J/K.
So 2.5W is enough to heat a cup of coffee at around 8.6 degrees C per hour. Since a cup of coffee will cool from around 100 to around 14 in an hour, the best you can hope for is a 10% reduction in temperature drop.
Or as we heat transfer scientists say, "fuck all".
(, Thu 29 Sep 2011, 18:34, 2 replies)
^ this..Is brilliant.
(, Fri 30 Sep 2011, 16:00, closed)
« Go Back | See The Full Thread