What is the magnitude of the acceleration of an electron when in an electric field of 
A. 
B. 
C. 
D. 
E. 
B.
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The solar nebula theory supposes that:
A) the moons of all the planets were not formed from a nebula. B) asteroids formed about half a billion years before the formation of the planets' moons. C) the Sun formed about a billion years before the planets. D) planets form in rotating disks of gas and dust around young stars.
What physical characteristics change in the Sun over the 11-year solar cycle? To what is this cycle apparently related?
What will be an ideal response?
A beam of light in air is incident on the surface of a rectangular block of clear plastic (n = 1.49). If the velocity of the beam before it enters the plastic is 3.00 × 10^8 m/s, what is its velocity inside the block?
a. 3.00E+8 m/s b. 1.35E+8 m/s c. 2.01E+8 m/s d. 2.46E+8 m/s e. 1.53E+8 m/s
What led Kepler to abandon circular orbits and his discovery that planetary orbits are ellipses?
A) a deviation between observed and model values that was much larger than the observation uncertainties B) a desire to gain prestige by using a more complicated model C) the observation of a comet moving on a highly eccentric orbit