The gravitational acceleration on a planet's surface is 16.0 m/s2. What is the gravitational acceleration at an altitude of one planet diameter above the SURFACE of the planet?
A) 5.33 m/s2
B) 1.78 m/s2
C) 1.60 m/s2
D) 4.00 m/s2
E) 8.00 m/s2
Answer: B
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Where would very large craters have formed?
a. on the Moon. b. on Mercury. c. on Earth. d. all of the above.
Analyze these generalizations about the eight planets in our solar system. Determine if they most likely apply to planets closer or farther away from the sun.
Where does a 1 solar-mass protostar appear on an H-R diagram?
A) It is to the right of the main sequence and higher up than the Sun. B) It is to the right of the main sequence and lower down than the Sun. C) It is to the left of the main sequence and higher up than the Sun. D) Nowhere; only stars that have fusion in their cores can be shown on H-R diagrams.
Mars has a sufficient mass and a low enough temperature that water molecules could exist in its atmosphere as vapor. One reason Mars' atmosphere does not contain a significant amount of water vapor is that
a. Mars formed in a part of the solar nebula that lacked oxygen. b. Mars formed in a part of the solar nebula that lacked hydrogen. c. All of the water vapor was released in the impact that formed Deimos. d. Ultraviolet radiation breaks the water molecule into less massive particles that can escape. e. The water molecule combines readily with chlorine to form hydrochloric acid.