In the Kelvin scale, absolute zero lies at
A) 273 degrees C.
B) zero K.
C) -373 degrees C.
D) Both A and B are correct.
E) Both A and C are correct.
B
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A spherical flask, 4 m diameter with a 5 mm thick wall, is used to heat grape juice. During the heating process the outside surface of the flask is 100ºC and the inside surface is 80ºC. Estimate the thermal resistance of the flask, the heat transfer through the flask, if it is assumed that only the bottom half is heated, and the temperature distribution through the flask wall.
What will be an ideal response?
One star is emitting mostly visible light, and another star is emitting mostly infrared light. Which star is hotter?
A) The temperature also depends on the radius of the star, so one can't decide based on the information provided. B) Both stars are the same temperature. C) The star emitting visible light. D) The star emitting infrared light.
A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg?m2 is rotating freely with an angular speed of 1.0 rad/s
Two people, each having a mass of 60 kg are standing right outside the edge of the merry-go-round and step on it with negligible speed. What is the angular speed of the merry-go-round right after the two people have stepped on? A) 0.20 rad/s B) 0.40 rad/s C) 0.60 rad/s D) 0.80 rad/s E) 0.67 rad/s
How would you describe the distribution of galaxies in your Local Group?
A.) They just look randomly distributed. B.) There are the two big galaxies, and then the dwarfs seem to be clustered around them. C.) The big galaxies are together at the center and the dwarfs are in a big circle around them. D.) The dwarfs are in the center clustered together and the two big galaxies are off to the side. E.) The two larger galaxies are on one side of the group and all the dwarfs are on the other side.