Two planets have the same surface gravity, but planet B has twice the radius of planet A. If planet A has mass m, what is the mass of planet B?
A) 4m B) m C) m/4 D) m E) m/
A
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Within a given system, the internal forces
A. are always balanced by the external forces. B. all add to zero. C. are only determined by subtracting the external forces from the net force on the system. D. determine the motion of the system. E. are measured with a gravimeter.
Which of the following alternatives to water has a wider temperature range over which it is a liquid?
A) ammonia B) methanol C) methane D) ethane
About how many stars has the Hipparcos mission given us accurate distance data on?
A) about 3,000, about half of what you can see with the naked eye alone B) over 6000, the visible naked eye stars and some seen in binoculars C) 60,000, those within about 100 light years of us D) a million, those with parallaxes of .005" or larger E) over 100 billion, almost every star in the galaxy
Why does the temperature of the corona rise with latitude? a. Atoms undergo fission when repelled by the corona
b. Atoms become neutralized as they dissipate in higher altitudes. c. Atoms within the corona become more ionized at higher altitudes. d. Atoms are forced upward from the chromosphere to the corona. e. Atoms are less excited as they move from the photosphere to the corona.