A hydrogen atom consists of an electron (with negative charge) orbiting a proton (with positive charge). With the conventional definition of the reference position for electrostatic potential energy, the electrostatic potential energy for this system
A. is positive.
B. is zero.
C. is negative.
D. depends on how fast the electron is moving.
C. is negative.
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The planet(s) of our solar system that are usually or never visible to the naked eye are
a. Mars. b. Mercury and Neptune. c. Saturn, Uranus, and Neptune. d. Uranus and Neptune. e. Mercury and Venus.
The temperature is observed to decrease from
to 
during the evening of a very hot day. What is the relative change in the speed of sound over this time interval?
A. -15% B. -28% C. -1.5% D. -3%
How many elements have been identified?
a. 92 b. 104 c. 114 d. over 200 e. none of the above
A 25-kg piece of equipment can be hung by steel wires of length 1.00 m, 2.00 m, or 3.00 m. If all the wires have the same diameter, which one will stretch the greatest percent?
A) the 3.00-m wire B) the 1.00-m wire C) the 2.00-m wire D) They will all stretch by the same percent.