If the temperature of the Earth cools, how does the carbon dioxide cycle respond?
A) it increases the rate of volcanic eruptions, thus increasing the rate of carbon dioxide production
B) it slows the formation of carbonate minerals in the oceans, thus pulling less carbon dioxide out of the atmosphere
C) it speeds up the formation of carbonate minerals in the oceans, thus pulling more carbon dioxide out of the atmosphere
D) it reduces the rate of volcanic eruptions, thus reducing the rate of carbon dioxide production
B
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When electromagnetic radiation is destroyed it is said to be
A) refracted B) absorbed C) reflected D) emitted
Radioactive isotopes are useful for
A) dating the ages of objects. B) tracing the path of certain chemicals. C) cancer therapy. D) All of the above. E) None of the above.
Force on a Wire: A rigid rectangular loop, measuring 0.30 m by 0.40 m, carries a current of 9.9 A, as shown in the figure. A uniform external magnetic field of magnitude 1.8 T in the -x direction is present. Segment CD is in the xz-plane and forms a 19° angle with the z-axis, as shown. What is the y component of the magnetic force on segment AB of the loop?
A. +5.1 N B. -5.1 N C. +1.7 N D. -1.7 N E. 0.0 N
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