If the distance between us and a star is doubled, its apparent brightness will decrease by a factor of four
Indicate whether the statement is true or false
TRUE
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A long nonconducting cylinder (radius = 6.0 mm) has a nonuniform volume charge density given by ?r2, where ? = 6.2 mC/m5 and r is the distance from the axis of the cylinder. What is the magnitude of the electric field at a point 2.0 mm from the axis?
A. 1.4 N/C B. 1.6 N/C C. 1.8 N/C D. 2.0 N/C E. 5.4 N/C
The source of all wave motion is
A) a wave pattern. B) a harmonic object. C) something vibrating. D) a region of variable high and low pressure. E) none of the above
DNA molecules cannot be altered by chance errors in reproduction
Indicate whether the statement is true or false
Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. Sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. Which one, if either is correct?
a. Beryl, because low thermal conductivity results in low heat transfer. b. Beryl, because low thermal conductivity results in high heat transfer. c. Sapphire, because low thermal conductivity results in low heat transfer. d. Sapphire, because low thermal conductivity results in high heat transfer. e. Neither, because low heat transfer is desirable both in summer and in winter.