Supernovae are one of the most extreme events in the known universe. They are caused by
A) the implosion of a white dwarf, which has run out of all its fuel.
B) a supermassive supergiant star undergoing a massive nuclear chain reaction.
C) the collapse of a supermassive supergiant star.
D) Any of the above.
Answer: C
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High-temperature superconductors are made of
A. ceramics with copper, yttrium, barium, and oxygen. B. noble gases like helium layered with highly reactive gases like hydrogen. C. 99.999% pure copper. D. metallic hydrogen.
A dog has three puppies. Spot weighs 12 ounces. Rascal weighs 9.5 ounces. Socks weighs 10.2 ounces. What is the total weight of the litter?
A) 31.7 ounces B) 31 ounces C) 32 ounces D) 30 ounces E) 31.70 ounces
The lifetime of uranium 238 is 6.0 × 109 y, and that of uranium 235 is 1.0 × 109 y. The present abundance of uranium 238 is 140 times the abundance of uranium 235. What was the ratio of abundances 1 billion years ago?
A) 140:1 B) 6:1 C) 61:1 D) 161:1 E) 322:1
You blow on food to cool it. Blowing increases
A) conduction. B) convection. C) radiation. D) the specific heat. E) the latent heat.