Which compound has three hydroxyl groups?
a. Ethylene glycol
b. Ethanol
c. Cholesterol
d. Glycerol
d
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The diagram shows a plot of the temperature of the sun as a function of distance above the bottom of the photosphere. What is the temperature of the sun at a distance of 2,000 km?
a. 500 K
b. 900 K
c. 5,000 K
d. 9,000 K
e. 100,000 K
A future space traveler, Skip Parsec, lands on the planet MSU3, which has the same mass as Earth but twice the radius. If Skip weighs 800 N on Earth's surface, how much does he weigh on MSU3's surface?
A. 50 N B. 100 N C. 200 N D. 400 N
A 5000-kg freight car moving at 2 m/s collides with a 10,000-kg freight car at rest. They couple upon collision and move away at
A) 2 m/s. B) 1 m/s. C) 2/3 m/s. D) 1/3 m/s.
The thermal conductivity of copper is 397 J/s/m/°C and of silver is 427 J/s/m/°C. A rod of each material is used as a heat conductor. If the rods have the same geometry and are used between the same temperature differences for the same time interval, what is the ratio of the heat transferred by copper to the heat transferred by the silver?
a. 0.930 b. 1.395 c. 2.093 d. 0.465 e. 0.791