The first solid grains of ______ formed in hot regions near the sun. Much farther from the sun the first grains (or rather flakes) of ________also formed by a similar process as the close-in grains, _______
a. water ice; iron; accretion
b. iron: water ice; accretion
c. water ice; iron; condensation
d. iron; water ice; condensation
D
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A figure skater on ice with arms extended, spins at a rate of 3.5 rev/s. After he draws his arms in, he spins at 6.0 rev/s. By what factor does the skater's kinetic energy change when he draws his arms in?
a. 2.4 c. 0.58 b. 1.7 d. 0.12
Electrical forces inside a nucleus contribute to nuclear
A) stability. B) instability. C) both of these D) neither of these
Which types of galaxies have a clearly defined disk component?
A) spirals only B) ellipticals only C) lenticulars only D) irregulars only E) spirals and lenticulars
What was the evidence that ancient astronomers used to conclude that Earth did not move?
What will be an ideal response?