For finding the distance to M31, Hubble relied upon
A) planetary nebulae near its core.
B) Cepheid variables in its spiral arms.
C) Type I supernova in its core.
D) Type II supernova in its spiral arms.
E) RR Lyrae stars in its globular clusters.
B
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On a cold winter's morning you awake and step out of bed. One foot is on the tile floor and the other is on a rug on the floor. Which statement is true?
A. The tile feels colder because it is connected to the cold ground outside B. The tile feels colder because it conducts heat more rapidly away from your foot C. The tile feels colder because it cannot absorb water like the rug can D. The tile feels colder because it is smoother than the rug
A transformer has an input of 6 V and an output of 42 V. If the input is changed to 12 V, the output would be
A) 12 V. B) 48 V. C) 84 V. D) more than 84 V. E) none of the above
Differences in absolute magnitude correspond to ratios of ________.
A. distance B. luminosity C. mass D. temperature E. brightness
Models of the Big Bang that include inflation predict that the overall geometry of the universe should be "flat" (in spacetime). This prediction
A) agrees with data found by studying the cosmic microwave background. B) has been verified by observing the paths of light coming from distant galaxies. C) has been shown to be incorrect by study of the expansion pattern of the universe. D) cannot be tested at this time.