The light bulb used in a lamp has a resistance of 240 ohms when operating on 120 volts. What is the bulb's power consumption?
60 W
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The pupil of the human eye is approximately 0.8 cm in diameter when adapted to the dark. The ratio of the light-gathering power of a 1.6-m telescope to that of the human eye is ____
a. 2 b. 4 c. 20 d. 400 e. 40,000
Which stars always have large positive absolute magnitude?
a. stars of high luminosity b. stars of low luminosity c. nearby stars d. distant stars e. not enough information given
Tarzan swings back and forth on a long vine. His friend Jane notices in amazement that he makes 30 complete swings in 2.4 minutes
(a) What is the frequency (in hertz) of Tarzan's swing? (b) How long is the vine he is using? What will be an ideal response?
The ionic charge of the nitrite ion in Al(NO2)3, aluminum nitrite, must be
a. 3+. b. 1–. c. 3–. d. 1+.