If we could combine all the planets together, their total mass would be about ________ the Sun's mass.
A) 1/1000 of
B) 1/10 of
C) the same as
D) double
E) half of
A) 1/1000 of
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One hundred meters of a certain type of wire has a resistance of 7.2 
What is the resistance of 2.5 m of this wire?
A. 18
B. 1.8
C. 0.18
D. 3.0
E. 0.30
What does not characterize a scientific explanation?
a. It is based on the ideas of the smartest people. b. It is based on a model of nature. c. It is based on observations. d. It is tested through prediction and experiments.
Suppose that we suddenly discovered that all these years we'd been wrong about the distance from Earth to the Sun, and it is actually 10% greater than we'd thought. How would that affect our estimate of the distance to the Andromeda Galaxy?
A) It would not have any effect on our estimate of the distance to the Andromeda Galaxy. B) It would mean the distance to the Andromeda Galaxy is also 10% greater than we thought. C) It would mean the distance to the Andromeda Galaxy is 10% less than we thought. D) It would mean that all the objects we've assumed are standard candles really are not good standard candles, and therefore that we have no idea of the true distance to the Andromeda Galaxy.
How did Copernicus's model of the Universe describe retrograde motion?
What will be an ideal response?