A star that is twice the mass of our Sun would have a habitable zone that:
a) includes Mars but not the Earth
b) includes Venus but not the Earth
c) includes Neptune only
d) includes both Venus and the Earth
e) includes Mercury only
Answer: a) includes Mars but not the Earth
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The Sun is rising in the east and will reach its highest point (on your meridian) in 2 hours. What is your local apparent solar time?
A) 2 a.m. B) 2 p.m. C) 10 a.m. D) 10 p.m. E) Noon
Which of the following solutions is the most acidic?
A) a solution with a pH = 14 B) a solution with a pH = 12 C) a solution with a pH = 7 D) a solution with a pH = 13 E) All of the solutions are basic.
If a 1 kg mass is completely converted into energy, the amount of energy released would be
a. 0.333 J b. 1 J c. 3 × 10^8 J d. 9 × 10^16 J e. none of the above
A resistor of unknown resistance and a 15-? resistor are connected across a 20-V emf in such a way that a 2.0 A current is observed in the emf. What is the value of the unknown resistance?
A. 75 ? B. 12 ? C. 7.5 ? D. 30 ? E. 5.0 ?