An AC circuit consists of a 60-Hz source, a 200-? resistor, and a 1.06-H inductor, all in series. What is the impedance of this circuit?
a. 400 ? b. 280 ?
c. 600 ? d. 450 ?
d
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If R = 2.0 k?, C = 4.0 mF, ? = 8.0 V, Q = 20 mC, and I = 3.0 mA, what is the potential difference Vb ? Va?
a.
+7.0 V
b.
+19 V
c.
+9.0 V
d.
?3.0 V
e.
?14 V
The force due to gravity between two objects can be described using the equation Fg = G M1 M2 / d2. In this equation, what does G represent?
A) the distance between the two objects B) the universal gravitational constant C) the density of the smaller object
A train has a rest length of 100 m. Traveling at a very high velocity, it goes through a tunnel of length 80 m. Observers located at both ends of the tunnel note that at one instant the train appears to exactly fit within the tunnel. What is the velocity of the train expressed in units of c?
A. 0.333c B. 0.60c C. 0.80c D. 0.50c E. 0.866c
____________________ is a description of the Ptolemaic model of the solar system
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