Suppose you measure the density (mass per volume) of an object moving by you at very high speed. How will its density compare to the density it would have at rest in your reference frame?
A) Its density would be lower.
B) Its density would be higher.
C) Its density would be the same.
D) There is no way to know, because relativity doesn't tell us anything about density.
B
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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 
what is its new component of velocity after going through the deflection plates?
a. 
b. 
c. 
d. 
e. 
Significant Figures: How many significant figures are in the number 0.010?
A. four B. three C. two D. one
The Hubble Telescope gets much clearer images of astronomical objects than ground-based telescopes because it has a much larger mirror than ground-based telescopes.
Answer the following statement true (T) or false (F)
An objective lens of a telescope has a 1.90 m focal length. When viewed through this telescope, the moon appears 5.25 times larger than normal. How far apart are the objective lens and the eyepiece when this instrument is focused on the moon?
What will be an ideal response?