Assume a change at the source of sound reduces the wavelength of a sound wave in air by a factor of 7. (i) What happens to its frequency? It increases by a factor of 49. It increases by a factor of 7. It is unchanged. It decreases by a factor of 7. It changes by an unpredictable factor. (ii) What happens to its speed? It increases by a factor of 49. It increases by a factor of 7. It is unchanged. It decreases by a factor of 7. It changes by an unpredictable factor.

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix. b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds. c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer. d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

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.

An object in mechanical equilibrium is an object