A loop or sheet of gas hanging above an active region of the Sun is a(n) ________, often striking along the limb during total eclipses
A) sunspot B) flare C) aurora D) prominence E) granule
D
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Imagine that, at a certain point in empty space, the curl of the magnetic field has a positive x component. What can we conclude from this information?
A. Ex must be positive at that point. B. Ex must be negative at that point. C. Ex must be zero at that point. D. Ex must be increasing with time at that point. E. Ex must be decreasing with time at that point. F. The magnetic field described is not physically possible. T. None of the above.
Which of the following applies to Titan?
A) It is the most volcanically active body in the solar system. B) It is thought to have a deep, subsurface ocean of liquid water. C) It is the only moon in our solar system with an atmosphere thicker than Earth's atmosphere. D) It is the largest moon in the solar system. E) It is probably a captured Kuiper belt object.
When astronomers study the light emitted from the Sun they notice that the light emitted from the east limb (edge) is blueshifted while the light emitted from the west limb is redshifted. The reason for this is that
A. the Sun is rotating. B. the Sun contains different chemicals that emit different colors. C. the two opposing limbs have different surface temperatures. D. the distance between Earth and the Sun is constantly changing.
If a = 60 cm, b = 80 cm, Q = ?4.0 nC, and q = 1.5 nC, what is the magnitude of the electric field at point P?
A. 68 N/C B. 72 N/C C. 77 N/C D. 82 N/C E. 120 N/C