This photo from the Curiosity rover shows what appears to be layered sedimentary rock on Mars. What does this photo seem to be telling us?
A) This region of Mars once held a body of water such as a lake.
B) Mars still has active volcanoes.
C) It still rains on Mars at least once every few million years.
D) There must not be any wind on Mars, or these features would have been erased.
A) This region of Mars once held a body of water such as a lake.
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The photons having greatest energy are those of
A) infrared. B) red light. C) green light. D) blue light. E) ultraviolet.
How is a planet different than a star?
a. Planets are larger than stars. b. Planets reflect light while stars produce their own light. c. Stars move faster in the sky than planets. d. Planets are brighter than stars.
When people get into a small boat it settles lower in the water and
a. the buoyant force increases as a result of more water being displaced b. the net force on the boat again becomes zero c. the pressure on the bottom of the boat becomes greater because it is deeper in the water d. all of the above
A car travels along eastward with a constant velocity. The magnitude of the acceleration of the car is
A) decreasing. B) increasing. C) non-zero constant. D) zero. E) None of the other choices is correct.