Resistance and Resistivity: The length of a certain wire is kept same while its radius is doubled. What is the new resistivity of this wire?
A. It is increased by a factor of 2.
B. It is increased by a factor of 4.
C. It is reduced by a factor of 2.
D. It is reduced by a factor of 4.
E. It does not change.
Answer: E
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A gas is allowed to expand at constant pressure as heat is added to it. This process is
A) isothermal. B) adiabatic. C) isobaric. D) isometric. E) isentropic.
Ptolemy's model of the universe
a. was heliocentric. b. included elliptical orbits. c. contained epicycles. d. all of the above e. none of the above
Tycho's universe was the same as the Copernican universe except that
a. Earth did not move. b. the sun did not move. c. the moon orbited the sun. d. the orbits were elliptical with the sun at one focus. e. the orbits followed uniform circular motion.
The last page of a book is numbered 764. The book is 3.0 cm thick, not including its covers. What is the average thickness (in centimeters) of a page in the book, rounded to the proper number of significant figures?
A) 0.0039 cm B) 0.072 cm C) 0.0079 cm D) 0.00393 cm E) 0.00785 cm