The potential energy of an electron in the ground state of the hydrogen atom is _________.
A. 0.000
B. -13.6 eV
C. -27.2 eV
D. 13.6 eV
E. 27.2 eV
C. -27.2 eV
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According to the nebular theory, how did the asteroid belt form?
A) It is made of planetesimals that formed beyond Neptune's orbit and never accreted to form a planet. B) It is made of planetesimals between the orbits of Mars and Jupiter that never formed into a planet. C) It consists of objects that fragmented from the protosun during a catastrophic collision early in the formation of the solar system. D) It is made of planetesimals formed in the outer solar system that were flung into distant orbits by encounters with the jovian planets. E) It is material left over from the interstellar cloud that never contracted with the rest of the gases to form the solar nebula.
An electron is fired through a pair of deflection plates, which produce a 2.00 cm long region with an electric field of 4000 N/C perpendicular to the electron's initial velocity. If the initial speed of the electron is 
how long does it take to traverse the plates?
A. 2.00 ?s B. 2.00 ns C. 1.70 ns D. 1.80 ns E. 1.50 ?s
Why does Earth have the strongest magnetic field among the terrestrial worlds?
A) It is the only one that has a metallic core. B) It rotates much faster than any other terrestrial world. C) It is the only one that has both a convecting core region and reasonably rapid rotation. D) It is by far the largest terrestrial world. E) It is the most volcanically active world.
A melon is tossed straight upward with 100 J of kinetic energy. If air resistance is negligible the melon will return to its initial level with a kinetic energy of
A) less than 100 J. B) more than 100 J. C) 100 J. D) need more information