Process of Science: The theory of thermal radiation says that hot objects are bluer than cool objects. Does it depend on what the object is made of? How can you test this?
What will be an ideal response?
The color of thermal radiation from an object does not depend on its composition. You can test this by heating two pokers, one made of iron, another of, say, copper. They would each have the same "white hot" glow, turning to red hot as they cooled down (although the rate at which they cooled down and therefore their color at the same time after they are out of the fire would be different).
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An aluminum fin is attached at both ends in a compact heat exchanger as shown. For the situation shown, determine the temperature distribution and the heat transfer through the fin.
What will be an ideal response?
We are unlikely to find fossil evidence of life from more than 3.5 billion years ago because there is no way life existed before then
Indicate whether the statement is true or false
Compared with the other jovian planets, Neptune is:
A) much larger and featureless. B) small with features similar to Jupiter. C) small and featureless. D) much larger with features similar to Saturn. E) average, but featureless.
A gold brick measuring 0.25 ft by 0.33 ft by 1 ft is submerged in water. The weight density of gold is 1,200 pounds per cubic foot and the weight density of water is 62.4 pounds per cubic foot. (a) What is the weight of the gold brick? (b) What is the buoyant force on the gold brick? (c) What is the net force on the gold brick?