What do we think happened to the solar nebula after the planets formed?
a. The gas was all used up in planet formation.
b. The rest of the gas gradually drifted away.
c. The solar wind helped blow the gas away.
d. The gas is still here; we just can’t see it.
Answer: c. The solar wind helped blow the gas away
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What is an emission nebula?
A. a region of ionized gas around hot O or B type stars B. a region of gas around cool K or M type stars C. a gas cloud in globular clusters D. a region of gas around black holes
While surface conditions differ greatly, name three ways that Venus and Earth are indeed "sister planets."
What will be an ideal response?
A baseball pitcher, loosening up his arm before a game, tosses a 0.15-kg ball using only the rotation of his forearm, 0.32 m in length, to accelerate the ball. If the ball starts at rest and is released with a speed of 24 m/s in a time of 0.40 s, what is the average angular acceleration of the arm and ball?
a. 0.067 rad/s2 c. 15 rad/s2 b. 94 rad/s2 d. 190 rad/s2
What is the difference between a supernova and a nova?
What will be an ideal response?