In a uniformly expanding universe, which statement best describes the situation as viewed from an observer in Galaxy C (not the Milky Way Galaxy)?
A) Galaxy C observer sees some galaxies moving away, some moving towards itself.
B) Galaxy C observer sees all galaxies moving away from the Milky Way Galaxy.
C) Galaxy C observer sees all other galaxies moving away from itself.
C
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Consider a scale on which our entire Milky Way Galaxy is about the size (diameter) of a grapefruit. Which of the following best describes the size and distance of the Andromeda Galaxy on the same scale?
A) a grapefruit about 3 meters away B) a grapefruit about 3 centimeters away C) a beach ball about the length of a football field away D) a peanut about 3 centimeters away E) a grapefruit about 3 kilometers away
A charge per unit length given by ?(x) = bx, where b = 12 nC/m2, is distributed along the x axis from x = +9.0 cm to x = +16 cm. If the electric potential at infinity is taken to be zero, what is the electric potential at the point P on the y axis at y = 12 cm?
A. 5.4 V B. 7.2 V C. 9.0 V D. 9.9 V E. 16 V
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