Evidence gathered from observations of exoplanets indicates approximately what percentage of stars have planets?
A) 0
B) 1
C) 10
D) 100
E) It is not yet possible to make an estimate.
D
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If, from the point of view of Earth-bound observers, the Moon is in new Moon phase on a particular day, what phase is Earth as seen from the Moon?
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An electron has a relativistic momentum of 1.1 × 10-21 kg-m/s. What fraction of its total energy is its kinetic energy?
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On which temperature scale is 212 degrees the boiling point of water?
A) Celsius B) Caloric C) Kelvin D) Fahrenheit E) none of the above
A satellite in a circular orbit of radius R around planet X has an orbital period T. If Planet X had one-fourth as much mass, the orbital period of this satellite in an orbit of the same radius would be
A) T B) 2T. C) T/2. D) 4T. E) T/4.