Conductors: A solid aluminum cube rests on a wooden table in a region where a uniform external electric field is directed straight upward. What can we say concerning the charge on the top surface of the cube?
A. The top surface is charged positively.
B. The top surface is charged negatively.
C. The top surface is neutral.
D. The top surface's charge cannot be determined without further information.
Answer: A
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A) 8 km/s. B) 9.8 km/s. C) 11.2 km/s. D) 42.2 km/s.
Star #1 is approaching the Earth with speed v. Star #2 is receding from the Earth with the same speed v. Measurements of the same spectral line from each of the stars show Doppler shifts in frequency. The light from which star will have the larger magnitude shift in frequency?
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A sidereal day is ______________ than a solar day
Fill in the blank(s) with correct word
Which of these are SI units?
a. centimeters b. newtons c. pounds d. seconds e. none of the above