Define newton's second law.

a. when an object puts a force on another object, the second object puts a force back on the first, equal in magnitude but opposite in direction.
b. the total energy through any process is conserved.
c. objects tend to keep their motion unless acted upon by an unbalanced outside force.
d. fnet = ma

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.