To measure how Mercury spins, astronomers sent ________ to Mercury and used the Doppler shift to determine how fast it was rotating
A) probes
B) laser beams
C) radar beams
D) a satellite
E) a single frequency radio signal
C
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Neptune has a highly tilted rotation axis, much like Uranus, and very unlike Saturn's
Indicate whether the statement is true or false
How did the lunar maria form?
A) Large impacts fractured the Moon's lithosphere, allowing lava to fill the impact basins. B) The early bombardment created heat that melted the lunar surface in the regions of the maria. C) Volatiles escaping from the Moon's interior heated and eroded the surface in the regions of the maria. D) The giant impact that created the Moon left smooth areas that we call the maria. E) The maria are the result of gradual erosion by micrometeorites striking the Moon.
As I pull a rope connected to a box at constant speed up a frictionless slope, pulling parallel to the slope, the tension in the rope will be:
a. greater than the tension would be if the box were stationary. b. greater than the weight of the box. c. equal to the weight of the box. d. less than the weight of the box.
The most common extrusive rocks are generated from
A) andesitic magma. B) granitic magma. C) basaltic magma. D) none of the above