Which of these waves will diffract the most when passing through a 20 cm wide opening in a barrier?
a. a wave with a wavelength of 25 cm
b. a wave with a wavelength of 2 cm
c. a wave with a wavelength of 0.05 cm
d. none of these waves will diffract at all
a
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Consider the cosine of any angle between 35° and 40°. If the angle were doubled, what would happen to the cosine of the angle
a. It would halve. b. It would decrease to less than half its original value. c. It would decrease but be more than half its original value. d. In different cases, it could do any of the above.
A tube open at one end and closed at the other end produces sound having a fundamental frequency of 350 Hz. If you now open the closed end, the fundamental frequency becomes
A) 87.5 Hz. B) 175 Hz. C) 350 Hz. D) 700 Hz. E) 1400 Hz.
Newton's Second Law in 1 Dimension: During a hard stop, a car and its passengers slow down with an acceleration of 8.0 m/s2. What magnitude force does a 50-kg passenger exert on the seat belt in such a stop?
Fill in the blank(s) with the appropriate word(s).
Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in opposite directions,
A) the wires pull toward each other. B) one wire is lifted slightly while the other wire is forced downward against the table's surface. C) both wires are lifted slightly. D) the wires push away from each other.