According to the table above, what happens to the acceleration as the mass decreases when the force on the object is constant? Apply this observation to our example of the empty vs. full shopping cart to explain why.

Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.