How many megabytes are there in a gigabyte?
a. 10 b. 1000
c. 1000000 d. none of the above
b
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The intensity of radiation reaching the earth from the sun is 1 350 W/m2 . The earth's radius is 6.4 × 10^6 m. How big a force does this radiation exert on the earth? (Assume it is all absorbed.)
a. 5.8 × 10^8 N b. 1.2 × 10^9 N c. 2.3 × 10^9 N d. 4.6 × 10^9 N e. 1.7 × 10^17 N
The number of electrons delivered daily to an average American home by an average power utility in the early 21st century was
A) zero. B) 110. C) 220. D) billions of billions. E) none of the above
The superposition of two waves
?
and
?
at the location x = 0 in space results in
A. beats at a beat frequency of 3 Hz. B. a pure tone at a frequency of 153 Hz. C. a pure tone at a frequency of 156 Hz. D. beats at a beat frequency of 6 Hz. E. beats at a frequency of 156 Hz.
When a boxer moves into an oncoming punch, the force experienced is
A) decreased. B) increased. C) no different, but the timing is different. D) all of the above