A satellite encircles Mars at a distance above its surface equal to 3 times the radius of Mars. The acceleration of gravity at the satellite, as compared to the acceleration of gravity on the surface of Mars, is
A) one-ninth as much.
B) zero.
C) the same.
D) one-third as much.
E) one-sixteenth as much.
E
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Photon Momentum: What is the wavelength of a photon having the same momentum as an electron that is traveling at 7.5 km/s? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg)
Fill in the blank(s) with the appropriate word(s).
Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart. Half way between the two plates the electric field has magnitude E
If the separation of the plates is reduced to d/2 what is the magnitude of the electric field half way between the plates? A) 4E B) 2E C) E D) 0 E) E/2
Spectra of the Martian surface taken from orbiting spacecraft have detected the presence of which of the following minerals that form in water?
A) hydrated clays, sulfates and silicates B) limestones C) zircons D) sea and rock salts
In the greenhouse effect, what is the direct cause of extra heating of the Earth's surface?
A) Additional carbon dioxide makes the atmosphere more opaque to infrared light, trapping part of the blackbody radiation that would normally escape into space. B) Additional carbon dioxide makes the atmosphere more transparent to infrared light, allowing the sun to more directly heat the surface. C) Additional carbon dioxide makes the atmosphere denser, and thus heat passes through it more slowly.