If the frequency of the waves produced by a vibrating object increases, how does the wavelength of the waves produced change?
a) it stays the same
b) it decreases
c) it vibrates
d) it increases

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.