A solar eclipse can only happen during a
A) new Moon.
B) solstice.
C) first quarter Moon.
D) full Moon.
E) perihelion passage of the Sun.
A
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Two dogs, Rover and Fido, run on a level frictionless surface. Rover runs eastward with a momentum of 24 kg . m/s, and Fido runs northward with momentum 10 kg . m/s. They make a sudden perfectly inelastic collision
What is the magnitude of their combined momentum after the collision? A) 14 kg . m/s B) 34 kg . m/s C) 26 kg . m/s D) It cannot be determined without knowing the masses and velocities of the dogs.
Whether or not a planet like Mercury can hold a particular gas in its atmosphere depends on that planet's
a. ice cap. b. craters. c. escape velocity. d. its distance from the Sun as manifested in the temperature of the atmosphere. e. escape velocity and its distance from the Sun as manifested in the temperature of the atmosphere.
Stage 4 of star formation is when the object can exhibit violent surface activity producing extremely strong protostellar winds. This phase is also called the:
A) protostar phase. B) Herbig-Haro phase. C) brown dwarf phase. D) T Tauri phase. E) protoplanetary nebula phase.
Where does most star formation occur in the Milky Way today?
A) in the halo B) in the bulge C) in the spiral arms D) in the Galactic center E) uniformly throughout the Galaxy