A charged particle moves in a region of uniform magnetic field along a helical path (radius = 5.0 cm, pitch = 12 cm, period = 5.0 ms). What is the speed of this particle as it moves along this path?
a. 67 m/s
b. 26 m/s
c. 63 m/s
d. 24 m/s
e. 87 m/s
a
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A 10-?F capacitor in an LC circuit made entirely of superconducting materials (R = 0 ?) is charged to 100 ?C. Then a superconducting switch is closed. At t = 0 s, plate 1 is positively charged and plate 2 is negatively charged. At a later time, Vab = +10 V. At that time, Vdc is
a.
0 V.
b.
3.54 V.
c.
5.0 V.
d.
7.07 V.
e.
10 V.
One common way to polarize a beam of light is to
A. slow it down using a piece of glass. B. filter out the longest wavelengths of the spectrum. C. use a sheet of Polaroid material. D. filter out the shortest wavelengths of the spectrum.
What is true of Mars?
A) Its atmosphere is mostly water vapor. B) Definite microfossils have been found. C) Its magnetic field is stronger than Earth's. D) Iron oxide on the surface is responsible for its reddish color. E) A pool of water was discovered by the Mars Rover.
Which of the following quantities has units of a velocity? (There could be more than one correct choice.)
A) 40 km southwest B) -120 m/s C) 9.8 m/s2 downward D) 186,000 mi E) 9.8 m/s downward