Which statement is not true? A A south pole repels a north pole.

B A south pole repels a south pole.

C A north pole attracts a south pole.

D A north pole repels a north pole.

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.