A 100-W driveway light bulb is on 10 hours per day. If the power company charges 10¢ for each kilowatt-hour of electric energy used, estimate the yearly cost to operate the bulb if it is used every day for a 365-day year
A) $3.65
B) $7.30
C) $37
D) $73
C
Physics & Space Science
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Radiation darkening explains why
A) there are so many dark craters on the jovian moons. B) Uranus' moons are darker than Saturn's. C) Earth's Moon is made of rock, but jovian moons are icy. D) Iapetus has a two-faced appearance.
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The Moon's angular diameter at apogee is larger than at perigee
a. True b. False Indicate whether the statement is true or false
Physics & Space Science
On March 21, the Moon is in its first-quarter phase. An observer who sees this Moon on his or her meridian at this time
a. cannot see the Sun. b. sees the Sun setting. c. sees the Sun rising. d. none of these
Physics & Space Science
An electromagnetic wave with a wave length about the same as the diameter of an apple would be
A. x-ray. B. UV. C. infrared. D. microwave. E. radio wave.
Physics & Space Science