What approach for estimating the distance to a galaxy requires the measurement of a galaxy's rotation speed?
A. Type Ia supernova as standard candles
B. the Tully-Fisher method
C. Hubble's law
D. Cepheid variables as standard candles
Answer: B
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Consider a situation where you carry a 20 N box up a flight of stairs, raising its elevation by 5 m. After the dropped box hits the floor, its kinetic energy is
a. 0 b. equal to its potential energy c. is converted to internal energy d. none of the above
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A. True B. False C. It depends on whether the collision is a head-on collision or a rear-end collision.
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a. True b. False Indicate whether the statement is true or false