If Q = 350 ?C and I = 4.0 mA in the circuit segment shown below, determine the potential difference, VA ? VB
a.
?30 V
b.
+80 V
c.
+40 V
d.
?40 V
e.
+10 V
d
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Uranus and Neptune do not contain liquid metallic hydrogen because they
a. are not massive enough. b. do not contain enough hydrogen. c. rotate too slowly. d. are too far from the sun. e. have magnetic fields that are much too weak.
Why is there a radioactive source in a smoke detector?
a. It makes the smoke particles radioactive. b. It ionizes the air. c. It powers the alarm when the battery wears out. d. none of the above
Dimensional Analysis: Using dimensional analysis, which one of the following equations is dimensionally correct? In these equations, x has units of meters, t has units of seconds, v has units of meters per second, and a has units of meters per second2.
A. x = v/t B. v = 2ax C. t2 = x/a D. x2 = 2av E. x = at
The percentage volume of unoccupied space in a material is called the material's ______________
Fill in the blank(s) with correct word