How much energy does a 100-watt light bulb use in 1 hour? Express your answer in (a) joules and in (b) kilowatt-hours. (c) Also find how much money it costs if electricity sells for 10 cents per kW-h
(a) 360,000 J, (b) 0.1 kW-h, (c)1 cent
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The sidereal period of the Moon is
a. about 27.32 days long. b. the period of time for the Moon to orbit Earth once with respect to the stars. c. the period of time between successive eclipses at a given location on Earth. d. the period of time from when the Moon rises until the Moon rises again the next night. e. about 27.32 days long and the period of time for the Moon to orbit Earth once with respect to the stars.
Two point charges of +1.0 ?C and -2.0 ?C are located 0.50 m apart
What is the minimum amount of work needed to move the charges apart to double the distance between them? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) -36 mJ B) +18 mJ C) 0 mJ D) +36 mJ E) -18 mJ
Any naturally occurring, inorganic, crystalline substance with a fairly definite chemical composition is called a(n)
a. element. b. compound. c. rock. d. mineral.
Increasing the aperture on a camera
A. reduces the depth of field and requires a longer exposure time. B. reduces the depth of field and requires a shorter exposure time. C. increases the depth of field and requires a longer exposure time. D. increases the depth of field and requires a shorter exposure time.