Outside a spherically symmetric charge distribution of net charge Q, Gauss's law can be used to show that the electric field at a given distance
A)
must be zero.
B)
must be directed outward.
C)
acts like it originated in a point charge Q at the center of the distribution.
D)
must be directed inward.
E)
must be greater than zero.
C
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What is meant by a scientific paradigm?
A) a radical change in scientific thought B) a pseudoscientific idea C) a generally well-established scientific theory or set of theories D) a conundrum, or unexplained set of facts E) a historical theory that has been proved inaccurate
In a LRC circuit, a second capacitor is connected in parallel with the capacitor previously in the circuit. What is the effect of this change on the impedance of the circuit?
A) It increases. B) It decreases. C) It does not change. D) It increases for frequencies below resonance and decreases for frequencies above resonance. E) It decreases for frequencies below resonance and increases for frequencies above resonance.
Two masses are connected by a cord that passes over a pulley as shown in the figure. The pulley and cord have negligible mass and 
(2.0 kg) moves on a horizontal surface without friction, 
(2.0 kg) is suspended vertically. What is the acceleration of 
?
A. 3.9 
B. 12
C. 6.0
D. 4.9
Could we see a galaxy that is 20 billion light-years away? (Assume that we mean a "lookback time" of 20 billion years.)
A) no, because it would be beyond the bounds of our observable universe B) yes, if we had a big enough telescope C) no, because a galaxy could not possibly be that far away D) Yes, we have already detected galaxies at that distance.