According to Lenz's law the direction of an induced current in a conductor will be that which tends to produce which of the following effects?
a. oppose the effect which produces it
c. produce the greatest voltage
b. enhance the effect which produces it
d. produce a greater heating effect
A
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The SI units of velocity are
a. mi/h b. km/h c. m/s2 d. m/s e. none of the above
Which of the following statements is not true about the sky at Earth's equator?
A) The Sun will pass directly overhead around noon each day. B) Over the course of the year, all 88 constellations will at some point be visible in the evening sky. C) There are no circumpolar stars in the equatorial sky. D) The north celestial pole is directly on your horizon, due north (with Polaris quite nearby).
The aberration of starlight gives proof that Earth is
a. rotating. b. revolving. c. precessing. d. none of these.
The first living organisms probably resembled
A) single-celled eukaryotes B) multicellular eukaryotes C) single-celled prokaryotes D) multicellular prokaryotes