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

Physics & Space Science

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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.

Physics & Space Science

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.

Physics & Space Science

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

Physics & Space Science

Any naturally occurring, inorganic, crystalline substance with a fairly definite chemical composition is called a(n)

a. element. b. compound. c. rock. d. mineral.

Physics & Space Science