The battery is disconnected from a series RC circuit after the capacitor is fully charged and is replaced by an open switch. When the switch is closed,
a. the current through the resistor is always greater than the current through the capacitor.
b. the current through the resistor is always less than the current through the capacitor.
c. the current through the resistor is always equal to the current through the capacitor.
d. the capacitor does not allow current to pass.
e. the current stops in the resistor.
c
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Fiber optic cable is in the form of a cylinder of fiber with index of refraction 1.67 and cladding around the outside of index of refraction 1.45. Light is shown on the end of the fiber at an angle of 
relative to the fiber’s axis. What is the maximum angle with respect to the axis that light can be incident upon the fiber’s end and be fully transmitted along the fiber thanks to total internal reflection at the fiber/cladding interface?
A. 
B. 
C. 
D. 
E. 
F. 
We now know of polar caps on Mercury, the Moon, Earth, and Mars
Indicate whether the statement is true or false
A simple pendulum and an object oscillating on an ideal spring both have period T in an elevator at rest. If the elevator now moves downward at a uniform 2 m/s, what is true about the periods of these two systems?
A) Both periods would remain the same. B) Both periods would increase. C) Both periods would decrease. D) The period of the pendulum would increase but the period of the spring would stay the same. E) The period of the pendulum would decrease but the period of the spring would stay the same.
The 500-m-long spaceship Springbrake is at rest on the planet Hitest for refueling. Another spaceship, Summerbrake, passes parallel to Springbrake at 0.600c. The crew on Springbrake measure the length of Summerbrake as it passes and find that the length they measure is exactly the same as the known 500-m rest length of Springbrake. If Summerbrake were at rest next to Springbrake, its length would then be measured to be
A. 180 m. B. 320 m. C. 500 m. D. 625 m. E. 781 m.