A harmonic longitudinal wave propagating down a tube filled with a compressible gas has the form s(x, t) = sm cos (kx ? ?t). Its velocity can be obtained from
a. ?/k
b. k/?
c. k
d. ?
e. ?k
a
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The velocity of an object as a function of time is given by v(t) = 2.00 m/s + (3.00 m/s) t - (1.0 m/s2 ) t2. Determine the instantaneous acceleration at time t = 4.00 s
A) -2.00 m/s2 B) -5.00 m/s2 C) 1.00 m/s2 D) 0.00 m/s2 E) -1.00 m/s2
Complete the following decay. 
a. 
b. 
c. 
d. 
e. 
An ac generator contains 80 flat rectangular loops of wire, each of which is 12 cm long and 8 cm wide. The loops rotate at 1200 rpm about an axis through the center and parallel to the long side
If the magnetic field in which the loop rotates is uniform, has magnitude 0.30 T, and is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator? A) 20 V B) 27 V C) 35 V D) 29 V
A pencil partially submerged in a glass of water appears broken or offset because of
a. polarization. b. diffraction. c. interference. d. refraction.