An electron follows a circular path (radius = 15 cm) in a uniform magnetic field (magnitude = 3.0 G). What is the period of this motion?
a. 0.12 ?s
b. 1.2 ms
c. 0.18 ?s
d. 1.8 ms
e. 1.8 ?s
a
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Which one of the arrows below most closely indicates the direction of the bob’s acceleration when it is at point 1?
A. A B. B C. C D. D E. E F. F
In an RLC series circuit, which of the following statements is true?
A. The current is in phase with the voltage across the inductor. B. The current is in phase with the voltage across the resistor. C. The current is in phase with the voltage across the capacitor. D. None of the choices are true.
Center of Mass: In the figure, four point masses are placed as shown. Assume that all the numbers in the figure are accurate to two significant figures. What are the x and y coordinates of the center of mass (or center of gravity) of this arrangement?
A. (2.2 m, 2.6 m) B. (2.2 m, 2.7 m) C. (2.3 m, 2.6 m) D. (2.3 m, 2.7 m) E. (2.3 m, 2.8 m)
Cell phone signals passing through walls is an example of
A) emission. B) reflection or scattering. C) absorption. D) transmission.