A resistor and a capacitor are connected in series to an ideal battery of constant terminal voltage. When this system reaches its steady-state, the voltage across the resistor is
A)
greater than the battery's terminal voltage.
B)
less than the battery's terminal voltage, but greater than zero.
C)
equal to the battery's terminal voltage.
D)
zero.
D
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Using a longer-handled wrench to loosen a tight nut allows you to
A. apply more torque to the nut. B. exert more force on the nut. C. increase the moment of inertia of the nut. D. pull harder on the wrench.
During operation of a nuclear reactor, the 238U nuclei
A) absorb neutrons, which causes them to turn into plutonium. B) slow down the neutrons, thus improving the efficiency of the reactor. C) absorb neutrons, which causes them to turn into fissionable 235U. D) absorb neutrons, which slows down the chain reaction and thus controls the reaction. E) are fissioned by the neutrons, thus releasing nuclear energy.
A majorette takes two batons and fastens them together in the middle at right angles to make an "x" shape. Each baton was 0.90 m long and each ball on the end is 0.20 kg. (Ignore the mass of the rods.) What is the moment of inertia if the arrangement is spun around an axis formed by one of the batons?
a. 0.081 kg•m2 c. 0.19 kg•m2 b. 0.064 kg•m2 d. 0.32 kg•m2
An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead