The finite disk shown below has a uniformly distributed positive charge. Which of the arrows in figure E2.12 best indicates the direction of the electric field vector that the plate produces at the points specified? 
At point P1 a small distance above the disk’s center?
A. A
B. B
C. C
D. D
E. AA
F. BB
G. CC
H. DD
A. A
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According to our basic scenario of solar system formation, why do the jovian planets have numerous large moons?
A) As the growing jovian planets captured gas from the solar nebula, the gas formed swirling disks around them, and moons formed from condensation accretion within these disks. B) Because of their strong gravity, the jovian planets were able to capture numerous asteroids that happened to be passing nearby, and these became the major moons of the jovian planets. C) The large moons of the jovian planets originally formed in the inner solar system and these moons then migrated out to join up with the jovian planets. D) The many moons of the jovian planets remains one of the unexplained mysteries of the formation of our solar system.
The universe has been expanding at the same rate since its formation
Indicate whether the statement is true or false
The most well-known impact crater in North America is
A) Crater Lake in Oregon B) Meteor Crater in Arizona C) Great Crater in Iowa D) Odessa Crater in Texas
How do you measure the speed of a galaxy relative to you?
A.) Radar. B.) Doppler shifts. C.) Light echoes. D.) Lorentz transformations. E.) All of the above.