When 100 g of a metal at 94° C is placed in 100 g of water at 10° C, the final temperature of the water is 17° C. Calculate the specific heat capacity of the metal?

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.