Two loudspeakers are placed facing each other and driven by the same source at 680 Hz. A listener is positioned between the two speakers on the line separating them, thus creating a constructive interference at the listener's ear. What minimum distance would one of the speakers be moved back away from the listener to produce destructive interference at the listener's ear? (The speed of sound =
340 m/s.)
a. 0.13 m
c. 0.50 m
b. 0.25 m
d. 1.00 m
B
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A child takes a small plastic bucket full of water and swings the bucket over her head in a circular arc, just barely fast enough for the water to stay in the bucket. Unbeknownst to the child, a fish is in the middle of the water. At the top of the arc, the fish
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Because the changes in energy levels happen in discrete steps, we refer to these as ________ leaps
Fill in the blank(s) with correct word
Blocks A and B of masses 14 kg and 15 kg, respectively, are connected by a rope, which passes over a light frictionless pulley, as shown
The horizontal surface is rough. The coefficients of static and kinetic friction are 0.40 and 0.20, respectively. External forces P and Q act on block B, as shown. In Figure 5.20, force Q equals zero. The force P, for which block B is on the verge of moving, is closest to: A) 200 N B) 540 N C) 310 N D) 1,200 N E) 400 N
A bridge is made with segments of concrete 50 m long. If the linear expansion coefficient is 12 × 10^?6 (°C)?1, how much spacing (in cm) is needed to allow for expansion during an extreme temperature change of 150° F?
a. 10 b. 2.5 c. 7.5 d. 5.0 e. 9.5