Ahockey puck, mass 0.115, moving at 35.0 m/s, strikes an octopus thrown on the ice by a fan. the octopus has a mass of 0.265. the puck and octopus slide off together. find their velocity.

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.