Which of the following is true of the spiral density wave theory?
A) It explains the formation of stars in self-sustaining star formation regions.
B) It establishes that spiral arms are wound up by differential rotation.
C) It does not account for the branches and spurs in spiral arms.
D) It does not explain the spiral structure of spiral galaxies.
C
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What physical property of Venus is vastly dissimilar compared to Earth?
a. Radius b. Mass c. Density d. Surface temperature
The moon ________ may have erupted to create the E rings around Saturn
Fill in the blank(s) with correct word
A +5.0-µC point charge is 12 cm from a -5.0-µC point charge. What is the magnitude of the field they produce at the point on the line connecting them where their electric potential (relative to infinity) is zero?
(k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) 0 N/C B) 12.5 MN/C C) 0.75 MN/C D) 25 MN/C E) 1.5 MN/C
Four identical point charges (+6.0 nC) are placed at the corners of a rectangle which measures 6.0 m × 8.0 m. If the electric potential is taken to be zero at infinity, what is the potential at the geometric center of this rectangle?
a. 58 V b. 63 V c. 43 V d. 84 V e. 11 V