A force of 15.0 N is applied to a wire with a diameter of 2.00 mm. If the wire changed length by 1.20 mm, then the stress in the wire is
A. 
B. 
C. 
D. 
E. 
A.
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What type of spectrum is emitted by a hot, tenuous gas?
A. emission-line B. continuous C. absorption-line D. None of these choices are correct.
Kirchhoff's Rules: A multiloop circuit is shown in the figure, but some quantities are not labeled. Find the current I1 if the batteries are ideal. (It is not necessary to solve the entire circuit.)
A. 0 A B. +0.2 A C. +0.4 A D. -0.2 A E. -0.4 A
Suppose we have a quantum system of an unknown type. We find that a certain amount of energy ?E moves this system from its lowest possible energy to its second-lowest energy, but 
?E is required to get it to its next higher energy. Is this quantum system a quanton in a box, a hydrogen atom, or a simple harmonic oscillator?
A. A quanton in a box. B. A hydrogen atom. C. A simple harmonic oscillator. D. The stated facts are inconsistent with all of these models.
While the gondola is rising at a speed of 2.0 m/s, a passenger in a balloon-supported gondola throws a small ball down at a speed of 5.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
a. 2.0 m/s, up. b. 3.0 m/s, down. c. 3.0 m/s, up. d. 5.0 m/s, down. e. 12.8 m/s, down.