Which of the following planets can be in opposition?
a. Mercury
b. Venus
c. Earth
d. Saturn
d
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Electrons with n = 3 are in the
A) M shell. B) N or M shells. C) K shell. D) N shell. E) L shell.
In Ptolemy's view of the universe, a planet moves on an epicycle whose center moves around the Earth on the deferent circle
a. Correct b. FALSE; Ptolemy put the Sun at the center. c. FALSE; The planet stays on the deferent circle. d. FALSE; Earth is at the center of the epicycle. e. FALSE; Both c and d are correct.
Venus and Earth started out with roughly the same amount of water. While Earth still has water in abundance, all of Venus' was lost. Where did it go?
A) It chemically combined with CO2 to form H2CO3.
B) Ultraviolet rays split the hydrogen from the oxygen components, and the hydrogen escaped into space.
C) It all evaporated into space due to the intense daytime heat of 470°C.
D) Scientists are still trying to determine this.
Two charges are separated by a certain distance. If the magnitude of each charge is doubled the force on each charge is
a. halved. b. doubled. c. tripled. d. quadrupled.