Two parallel wires carry currents in the same direction and exert a force on each of magnitude F for each meter of length. One of the currents is now reversed in direction and doubled in magnitude. What are the resulting magnitude for the force per meter of length and its direction relative to the wires?
1.2F, attractive
2.2F, repulsive
3.4F, attractive
4.4F, repulsive
2
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The choices below each describe the appearance of an H-R diagram for a different star cluster. Which cluster is most likely to be located in the halo of our galaxy?
A) The diagram shows main-sequence stars of every spectral type except O, along with a few giants and supergiants. B) The diagram shows main-sequence stars of spectral types G, K, and M, along with numerous giants and white dwarfs. C) The diagram shows main-sequence stars of all the spectral types except O and B, along with a few giants and supergiants. D) The diagram shows no main-sequence stars at all, but it has numerous supergiants and white dwarfs.
One of the first atomic bombs released energy equivalent to that of 20,000 tons of TNT explosive
How much mass was converted to energy by this explosion, given that 1000 tons of TNT produce 4.3 × 1012 J of energy. Incidentally, modern H-bombs have energy yields 1000 times as much! (c = 3.0 × 108 m/s)
The rotation curve of a galaxy is displayed as a plot of
a) gravity vs. distance to galaxy center b) rotation velocity vs. distance from Earth c) period of rotation vs. distance from Earth d) redshift vs. blueshift e) rotation velocity vs. distance to galaxy center
A 120.0 N picture hangs from a nail in the wall. The maximum shear stress the nail can sustain is 
The smallest diameter the nail can be is
A. 10.46 mm. B. 12.36 mm. C. 14.84 mm. D. 16.67 mm. E. 18.35 mm.