What's the Big Bang?
a. the creation of the universe
b. microwave radiation from all directions in the sky
c. the Hubble relation
d. a punk rock band
A
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Where does a 1 solar-mass protostar appear on an H-R diagram?
A) It is to the right of the main sequence and higher up than the Sun. B) It is to the right of the main sequence and lower down than the Sun. C) It is to the left of the main sequence and higher up than the Sun. D) Nowhere; only stars that have fusion in their cores can be shown on H-R diagrams.
A convex spherical mirror with a focal length of magnitude 25 cm has a 4.0-cm tall flower placed 100 cm in front of it. What is the height of the image of the flower?
A) 0.80 cm B) 20 cm C) 4.0 cm D) 1.6 cm E) 8.0 cm
How would you classify the following material?
swimming pool water A) homogeneous mixture B) heterogeneous mixture C) a pure element D) a pure compound E) depends on how many children have been in it
Underground rivers can exist in
A) limestone aquifers. B) science fiction. C) all aquifers. D) any of the above.