A speed of 65 miles per hour is the same as which of the following? (1.00 ft = 30.48 cm)
A) 24 m/s
B) 29 m/s
C) 32 m/s
D) 37 m/s
E) 42 m/s
B
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Power: The power factor of an ac RL circuit with a 100-? resistor and a certain inductor is 0.60. What is the impedance of the circuit?
A. 170 ? B. 85 ? C. 340 ? D. 100 ? E. 60 ?
Earth continually moves about 30 km/s through space, which means the wall you stand next to also is moving at 30 km/s. When you jump vertically the wall doesn't slam into you because
A) the speeds of you and Earth cancel out. B) you're moving horizontally just as fast as the wall. C) your upward motion is small compared with Earth's speed. D) motion of the Sun counteracts your motion.
What does Hubble's law imply about the history of the universe?
A) The universe must be infinitely old and huge. B) The universe had a beginning and has expanded since, giving it a finite age. C) The Milky Way lies exactly at the center of this expansion. D) The redshifts will lengthen with time due to dark energy. E) The redshifts will turn to blue shifts as universe contraction follows the expansion.
Which will cool faster when removed from a furnace?
A) iron B) silver C) the same