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Chapter 3: Q37P (page 642)
A blacksmith cools a 1.20 kg chunk of iron, initially at ,by trickling water over it. All of the water boils away, and the iron ends up at . How much water did the blacksmith trickle over the iron?
The 0.114 kg water did the blacksmith trickle over the iron.
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Many automobile engines have cast-iron cylinders and aluminium pistons. What kinds of problems could occur if the engine gets too hot? (The coefficient of volume expansion of cast iron is approximately the same as that of steel.)
When you blow on the back of your hand with your mouth wide open, your breath feels warm. But if you partially close your mouth to form an 鈥渙鈥� and then blow on your hand, your breath feels cool. Why?
During a test dive in 1939, prior to being accepted by the U.S. Navy, the submarine Squalus sank at a point where the depth of water was 73.0 m. The temperature was at the surface and at the bottom. The density of seawater is 1030 kg/m. (a) A diving bell was used to rescue 33 trapped crewmen from the Squalus. The diving bell was in the form of a circular cylinder high, open at the bottom and closed at the top. When the diving bell was lowered to the bottom of the sea, to what height did water rise within the diving bell? (Hint: Ignore the relatively small variation in water pressure between the bottom of the bell and the surface of the water within the bell.) (b) At what gauge pressure must compressed air have been supplied to the bell while on the bottom to expel all the water from it?
When ice melts at 0掳C, its volume decreases. Is the internal energy change greater than, less than, or equal to the heat added? How can you tell?
Why is a hot, humid day in the tropics generally more uncomfortable for human beings than a hot, dry day in the desert?
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