To "spear" a blue fish with a red laser beam and compensate for refraction, aim your laser
A) directly at the sighted fish.
B) above the sighted fish.
C) below the sighted fish.
Answer: C
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Reactance: What rms current flows in a 60-mH inductor when 120-V rms ac at a frequency of 20 kHz is applied to it?
A. 8.0 mA B. 16 mA C. 24 mA D. 32 mA
Two moons orbit a planet in nearly circular orbits. Moon A has orbital radius r, and moon B has orbital radius 4r. Moon A takes 20 days to complete one orbit. How long does it take moon B to complete an orbit?
A) 20 d B) 40 d C) 80 d D) 160 d E) 320 d
Which of the following gases absorbs ultraviolet light best?
A) carbon dioxide B) nitrogen C) oxygen D) hydrogen E) ozone
A clerk can lift containers a vertical distance of 1 m, or roll them up a 2-m-long ramp to the same elevation. With the ramp, the applied force needed is
A) half as much. B) twice as much. C) the same.