A magnetic field exerts a force on an electric charge if the charge is
a. positive
b. negative
c. moving
d. stationary
e. any of the above
C
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Intensity of Sound: A barking dog delivers about 1.0 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level in decibels at a distance 5.00 m from the dog? The threshold of human hearing is 1.0 × 10-12 W/m2.
A. 61 dB B. 63 dB C. 65 dB D. 68 dB
Refracting Telescope: To maximize the magnification of a refracting telescope, what lenses should you choose?
A. The objective lens and eyepiece should both have small focal lengths. B. The objective lens and eyepiece should both have large focal lengths. C. The objective lens should have a small focal length and the eyepiece should have a large focal length. D. The objective lens should have a large focal length and the eyepiece should have a small focal length. E. The objective lens should have a large focal length, but it doesn't matter what the focal length of the eyepiece is.
If a positively charged object is brought near a suspended, positively charged object, the suspended object will be
a. repelled. b. charged more. c. discharged. d. attracted.
In a composite material the _____________phase is continuous and is responsible for holding the composite material together.
Fill in the blank(s) with the appropriate word(s).