Two waves are described by y1 = 6cos(180t) and y2 = 6cos(186t) (both in meters). With what angular frequency does the maximum amplitude of the resultant wave vary with time?
a. 366 rad/s
b. 6 rad/s
c. 3 rad/s
d. 92 rad/s
e. 180 rad/s
c
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Most of the planets discovered around other stars using the Doppler technique
A) are more massive than Earth and orbit very close to the star. B) are found around neutron stars. C) are less massive than Earth and orbit very close to the star. D) are more massive than Earth and orbit very far from the star. E) are less massive than Earth and orbit very far from the star.
Suppose you have a 100-watt light bulb that you leave turned on for one minute. How much energy does it use?
A) 6,000 joules B) 6,000 watts C) 100 watts D) 100 joules
Two wires support a post, with dimensions as shown in the figure. If d = 14 m, what is the value of x?
a.
7.5 m
b.
6.5 m
c.
18.3 m
d.
5.2 m
The wavelength of a wave multiplied by the frequency of the wave is the wave's
a. speed b. frequency c. wavelength d. amplitude e. loudness