To initiate star formation in a cloud, you need a __________
a. slow contraction of a molecular cloud b. rotating molecular cloud
c. magnetic field d. shock
d
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A positive and a negative charge near each other are released. As they move, the force on each particle
A) increases. B) decreases. C) stays the same.
Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from her in opposite directions at 0.70c
At what speed would an observer in Alpha see the galaxy Beta moving? A) 0.82c B) 0.70c C) 0.94c D) 0.35c E) 0.57c
Relative Velocity: The driver of a motorboat that can move at 10 m/s in still water wishes to travel directly across a river in which the current flows at 5.0 m/s.(a) At what angle, measured from the upstream direction, should the driver head the boat?(b) How many minutes will it take to cross the river if it is 1.6 km wide at that point?
Fill in the blank(s) with the appropriate word(s).
A significant step in "unifying" the forces of nature was the discovery that two of the so-called fundamental forces were two parts of a single force. The two forces that were so unified were
A) the electromagnetic force and the weak force. B) the electromagnetic force and the strong nuclear force. C) the electromagnetic force and the gravity force. D) the weak force and the strong nuclear force. E) the weak force and the gravity force.