How does the escape speed from Mars compare with that of the Earth? [ MEarth=9.31? MMars; REarth=1.88 ? RMars]
A) 222.%
B) 22.5%
C) 44.9%
D) 66.2%
E) 20.2%
C
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Force on a Wire: A straight wire carries a current of 10 A at an angle of 30° with respect to the direction of a uniform 0.30-T magnetic field. Find the magnitude of the magnetic force on a 0.50-m length of the wire.
A. 0.75 N B. 1.5 N C. 3.0 N D. 6.0 N
Which one of the following is TRUE?
A) Most elliptical galaxies contain only young stars. B) Barred spiral galaxies have similar properties to normal spirals, except for the "bar" feature. C) Galaxy collisions destroy most of the stars in the galaxies involved. D) Irregular galaxies rarely have star formation taking place in them. E) Most galaxies appear to be approaching the Milky Way Galaxy.
Neon has 10 electrons. What is the value of Z of the next higher element that has chemical properties very similar to those of neon?
A) 11 B) 17 C) 18 D) 19 E) 36
When should we know if any extra-solar planetary systems are like ours?
A) in just a few years B) any day now, thanks to new, large, ground-based telescopes C) in a decade or two, through our current space missions D) We have already discovered several systems just like ours, through the Kepler mission.