The speed of sound in air is greatest for
A) high frequencies
B) low frequencies
C) same for all frequencies
Ans: C) same for all frequencies
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What behavior do galactic rotation curves exhibit to suggest the existence of dark matter in an extended halo?
a. Small velocities are seen at large distances from the galactic center. b. Small velocities are seen at distances close to the galactic center. c. Large velocities are seen at large distances from the galactic center. d. Large velocities are seen at distances close to the galactic center.
Velocity: A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, and then 1.0 km north to return to its starting point. This trip takes 45 min. What was the bear's average speed?
A. 0.00 km/h B. 0.067 km/h C. 4.0 km/h D. 5.3 km/h
Passengers in a high-flying jumbo jet feel their normal weight in flight, while passengers in an orbiting space vehicle do not, because passengers in the space vehicle are
A) beyond the main pull of Earth's gravity. B) above Earth's atmosphere. C) without support forces. D) all of the above E) none of the above
A scale from which a rock is suspended reads 5 N when the rock is out of water and 3 N when the rock is submerged. Buoyant force on the rock is
A) 2 N. B) 3 N. C) 4 N. D) 5 N.