An object moves in a direction parallel to its length with a velocity that approaches the velocity of light. The length of this object, as measured by a stationary observer,
A)
approaches infinity.
B)
approaches zero.
C)
increases slightly.
D)
decreases slightly.
E)
does not change.
B
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The first observation of electron diffraction was done by
A. J. J. Thompson. B. Louis de Broglie. C. Neils Bohr. D. Einstein and Planck. E. Davisson and Germer.
Several resistors are connected in parallel. Which of the following statements are correct? Choose all that are correct
1.The equivalent resistance is greater than any of the resistances in the group. 2.The equivalent resistance is less than any of the resistances in the group. 3.The equivalent resistance depends on the voltage applied across the group. 4.The equivalent resistance is equal to the sum of the resistances in the group. 5.None of those statements is correct.
Hooke's law relates
A. The spring force to the force used to compress the spring B. Change of the length of the spring to gravity C. Change of the length of the spring to the metal the spring is made of D. The spring force to the change in the length of the spring
Gino says that the analog of Gauss's law for the flow of an incompressible fluid of density ? at constant velocity 
is 
for an imaginary surface within the fluid. Lorenzo says that it is true only if the area where the fluid enters the surface and the area where it leaves the surface are both perpendicular to the velocity of the fluid. Which one, if either, is correct?
a.
Gino, because as much fluid leaves as enters.
b.
Lorenzo, because is not equal to zero if the fluid enters or exits at angles other than 90°.
c.
Lorenzo, because this is true only when the fluid executes rotational motion.
d.
Gino, because it is true only when the fluid is enclosed on all sides, not when it is flowing.
e.
Lorenzo, because it is true only when the fluid is enclosed on all sides, not when it is flowing.