Alien astronomers are using the radial-velocity method to look for planets around our Sun. Which planet are they most likely to detect first?
A. Jupiter
B. Neptune
C. Mercury
D. Earth
Answer: A
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A certain 20-A circuit breaker trips when the current in it equals 20 A. What is the maximum number of 100-W light bulbs you can connect in parallel in an ideal 120-V dc circuit without tripping this circuit breaker?
A) 27 B) 11 C) 17 D) 23
A highly ionized atom with Z = 5 has only one electron left around it, in its ground state. How much more energy is required to finish the job and have a bare nucleus?
A) 13.1 eV B) 10.9 eV C) 340.0 eV D) 68.0 eV
Headward erosion of a group of cirques around a mountain may produce
A) glacial lakes. B) an arete. C) a horn. D) a hanging valley.
If an aluminum alloy’s numerical designation is followed by “H18”, it is strainhardened to _________hardness.
Fill in the blank(s) with the appropriate word(s).