Which galaxy rotation curve, based on hydrogen gas speeds and locations, would indicate an unusually large amount of dark matter?
A) Orbital speeds remain constant, beyond where the stars are.
B) Orbital speeds rise, beyond where the stars are.
C) Orbital speeds decline, beyond where the stars are.
B
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In general, sound is conducted fastest through
A) gases. B) liquids. C) solids. D) a vacuum.
A change of 100o on the Celsius scale is
equal to a change of how many degrees on the Fahrenheit scale? a)212 b)120 c)100 d)180
What does the polarization of starlight tell us about the dust grains and the Galaxy?
What will be an ideal response?
A bar magnet is attached solidly to a frictionless surface and its length is aligned with the x axis. To the right of the first magnet a short distance away is a second bar magnet with its center placed on the x axis and its length perpendicular to the x axis. The second magnet is free to move. Once placed in position at rest, which best describes the initial motion of the second magnet?
a. The magnet will move away from the fixed magnet. b. The magnet will not move. c. The magnet will move toward the fixed magnet. d. The magnet will start to rotate.