A metal block has a density of 5000 kg per cubic meter and a mass of 15,000 kg. What is its volume?
A) 0.33 cubic meters
B) 3 cubic meters
C) 5 cubic meters
D) 15 cubic meters
E) none of the above
Answer: B
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A neon light (thin hot neon gas in a sealed tube) gives us
A) a continuous spectrum, since the neon is hot enough to glow. B) a few bright emission lines, telling us the gas is neon. C) a continuum, with dark lines identifying the neon atoms that are present. D) a lot of random bright red lines due to the motion of the hot atoms. E) nothing visible to us, but a lot of infrared lines as heat.
A drawback to mining sulfides is the risk of _______________.
a. underground fires c. “rock bursts” b. tunnel collapse d. acid mine runoff
An engineer wants to use a river (minimum temperature of 
to cool his electrical plant which heats water with a boiler operating at 
If he wishes to produce 185 kW of power using this plant, what is the minimum energy he must supply to his boiler if it is maximally efficient?
A. 233 kW B. 187 kW C. 332 kW D. 418 kW
What do the structures of Stonehenge, the Templo Mayor, and the Sun Dagger all have in common?
A) They were all places used for religious sacrifice. B) They were all built on the orders of ancient Mediterranean kings. C) They all can be used as lunar calendars. D) They were all used by ancient peoples for astronomical observations. E) all of the above