A given individual is unable to see objects clearly when they are beyond 75 cm. What focal length contact lens should be used to correct this problem?
a. 75 cm
c. -100 cm
b. -75 cm
d. -33.3 cm
B
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The planet Venus requires 225 days to orbit the sun, which has a mass M = 1.99 × 10^30 kg, in an almost circular trajectory. Calculate the radius of the orbit and the orbital speed of Venus as it circles the sun
How small an object can a scanning tunneling microscope "see?"
a. about the size of a mushroom spore b. about the size of a living cell c. as small as a single atom d. as small as the nucleus of an atom
Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. Sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. Which one, if either is correct?
a. Beryl, because low thermal conductivity results in low heat transfer. b. Beryl, because low thermal conductivity results in high heat transfer. c. Sapphire, because low thermal conductivity results in low heat transfer. d. Sapphire, because low thermal conductivity results in high heat transfer. e. Neither, because low heat transfer is desirable both in summer and in winter.
Light reflected off a plate-glass window (n = 1.5) is found to be completely polarized at angle-of-incidence ?. Find ?
a. 56.3° b. 5.7° c. 21.2° d. 18.6° e. 33.7°