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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Which of the following is not a property of an austenitic stainless steel?
(a) Ferromagnetism (b) Resistant to corrosion in saltwater (c) High ductility (d) FCC crystal structure
The force of gravity is the only one of the four forces felt on large size scales. Which of the following best explains why the other forces don't play a major role on large scales?
A) The strong and weak forces act only on small scales, and large objects tend to be electrically neutral and therefore don't feel an electromagnetic force. B) The other three forces are all short in range, and cannot be felt over large distances. C) Gravity is by far the strongest force, so it simply dominates on large size scales. D) Effects of the strong and weak forces tend to cancel out effects of the electromagnetic force on large scales.
A reversible engine operating between 500 K and 300 K has the same efficiency as a reversible engine operating between 400 K and what lower temperature?
A) 200 K B) 220 K C) 240 K D) 260 K E) 280 K
The length of a telescope is 2.00 m and the focal length of the objective lens is 2.0 cm. What is the focal length of the eyepiece?
A) 200 cm B) 202 cm C) 101 cm D) 2.0 cm E) 198 cm