Europa has few craters because
a. it is protected from impacts by Jupiter's gravity.
b. it does not have a solid surface.
c. it has erased craters nearly as fast as they have formed.
d. its surface is not strong enough to support craters.
e. it keeps one face always pointed toward Jupiter which screens it from incoming meteorites.
C
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Double-Slit Interference: Two radio antennas are 10 km apart on a north-south axis on high mountain tops at the seacoast. The antennas broadcast identical AM radio signals, in phase, at a frequency of 4.70 MHz. A steamship, 200 km offshore, travels toward the north at 15 km/h and passes east of the antennas. A radio on board the ship is tuned to the broadcast frequency. The reception of the radio signal on the ship is a maximum at a given instant. How much later until the next occurrence of maximum reception? (c = 3.00 × 108 m/s)
A. 5.1 min B. 3.8 min C. 6.4 min D. 7.7 min E. 8.9 min
By how much will a slab of concrete 18. m long contract when the temperature drops from 24.°C to -16.°C? (The coefficient of linear thermal expansion for concrete is 12 × 10-6 per degree C.)
A) 1.5 cm B) 0.86 cm C) 70. mm D) 15. cm E) 0.5 cm
Two pipes are smoothly connected together without leaks. One has a diameter of 3 cm and the other has a diameter of 5 cm. Water flows through the pipes. In which pipe is the flow speed the greatest?
1.in the pipe that the water flows through first (the "upstream" pipe) 2.in the 3 cm pipe 3.in the 5 cm pipe 4.in neither, the flow rate is the same in both pipes
Metamorphism caused by the close proximity of a magma source is called
A) contact metamorphism. B) dynamic metamorphism. C) regional metamorphism. D) none of these