A galaxy's spectrum has a redshift of 30,000 kilometers per second. If the Hubble constant is 75 kilometers per second per megaparsec, how far away from Earth is the galaxy?
A. 1,000 megaparsecs
B. 106 megaparsecs
C. 400 megaparsecs
D. 20 megaparsecs
E. 50 megaparsecs
Answer: C
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A speeding car traveling at a constant velocity of 24 m/s passes a police care initially at rest beside the roadway. If the police car with constant acceleration of 3.0 m/s2 immediately pursues the speeding car, how far down the road does it draw even with the speeding car?
a. 190 m b. 290 m c. 380 m d. 770 m
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The unit of electric resistance, the ohm, is equivalent to which of the following?
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