Write out the number 8.42 × 10-5 in full with a decimal point and correct number of zeros
A) 0.00000842
B) 0.0000842
C) 0.000842
D) 0.00842
B
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A comet’s plasma tail always points directly away from the Sun because __________.
a. of pressure exerted by the fast-moving charged particles in the solar wind b. centrifugal forces throw the tail outward as the comet travels around the Sun c. the comet’s nucleus overheats on the Sun-facing side, forcing energetic jets of gas to shoot out from the dark side d. the tail is left behind as the comet moves through its orbit
A high f-number:
a. allows using a slower shutter speed. b. causes more spherical aberration. c. allows a larger depth of focus. d. is not related to any of the above options.
Name two ways the magnetic fields of Uranus and Neptune defy the normal behavior of planetary magnetic fields
What will be an ideal response?
A planet with its rotation axis tilted by 40 degrees relative to its orbital plane aroundits star would:
a) have dark all the time on the South pole during its winter b) have shorter days and nights than those of Earth c) have longer years than those of Earth d) have longer days and nights than those of Earth e) have dark all the time on the North pole during its summer