A styrofoam container used as a picnic cooler contains a block of ice at 0°C. If 225 grams of ice melts in 1 hour, how much heat energy per second is passing through the walls of the container? (The heat of fusion of ice is 3.33 × 10^5 J/kg)
20.8 J (per second)
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120 J of heat flows by thermal conduction from
to 
What is the change in entropy for this process?
A. 0.034 J/K B. 0.118 J/K C. 0.201 J/K D. 0.338 J/K
What observational evidence supports the idea that a collision between two spiral galaxies might lead to the formation of a single elliptical galaxy?
A) Some elliptical galaxies surrounded by shells of stars that probably formed from stars stripped out of smaller galaxies. B) Elliptical galaxies dominate the galaxy populations at the cores of dense clusters of galaxies. C) Elliptical galaxies with stars and gas clouds that orbit differently from the other stars in the galaxy. D) There are giant elliptical galaxies at the center of dense clusters that may have grown by consuming other galaxies. E) All of the above are correct.
Yellow paint always subtracts or absorbs
a. Red light b. Blue light c. Yellow light d. Cyan light
Two identical fish, both at sea level, float in two identical aquariums with identical quantities of water. Fish A is in Alaska, so it weighs more than fish B at the equator, since g is larger at sea level in Alaska. Which statement is correct?
a. A comparison is impossible unless they are both floating at the same level. b. Fish A displaces a greater quantity of water than fish B. c. Fish B displaces a greater quantity of water than fish A. d. They both displace the same quantity of water. e. Fish A has a smaller acceleration than Fish B when equal horizontal forces are applied to each, because Fish A weighs more.