In a daring lecture demonstration, an instructor dips his wetted fingers into molten lead (327°C) and withdraws them quickly, without getting burned. How is this possible? (This is a dangerous experiment, which you should NOT attempt.)
Answer to relevant QuestionsWhat is wrong with the following statement? “Given any two objects, the one with the higher temperature contains more heat.”When a sealed Thermos bottle full of hot coffee is shaken, what are the changes, if any, in (a) the temperature of the coffee (b) the internal energy of the coffee?Why do heavy draperies over the windows help keep a home cool in the summer, as well as warm in the winter?Why is it more comfortable to hold a cup of hot tea by the handle rather than by wrapping your hands around the cup itself?The rotating solid steel shaft is simply supported by bearings at points B and C and is driven by a gear (not shown) which meshes with the spur gear at D, which has a 6-in pitch diameter. The force F from the drive gear acts ...
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