A spherical interplanetary grain of dust of radius 0.2 mm is at a distance r1 from the Sun. The gravitational force exerted by the Sun on the grain just balances the force due to radiation pressure from the Sun’s light. Assume the grain is moved to a distance 2r1 from the Sun and released. At this location, what is the net force exerted on the grain?
1.toward the Sun
2.away from the Sun
3.zero
4.impossible to determine without knowing the mass of the grain
3
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How is it that Earth has less CO2 in its atmosphere than Venus, even though both planets likely outgassed the about the same amount of CO2 during their development? a. Earth absorbed most of the CO2 into its oceans
b. Venus absorbed most of the CO2 into its oceans. c. Earth lost most of its CO2 because of weak gravity. d. Venus rotates too slowly to lose any of its CO2. e. Venus retained much of its CO2 in polar ice.
If life exists on Mars today, it will most likely be found
A) on the surface B) at the center of the planet C) beneath the surface where liquid water may still exist D) floating high in the atmosphere
The "guest star" observed by the Chinese in 1054 is now known to have been a(n) ________
Fill in the blank(s) with correct word
A 50.0-kg crate is being pulled along a horizontal smooth surface. The pulling force is 10.0 N and is directed 20.0° above the horizontal. What is the magnitude of the acceleration of the crate?
A) 0.0684 m/s2 B) 0.188 m/s2 C) 0.200 m/s2 D) 0.376 m/s2 E) 0.0728 m/s2