Rozprawka każdy człowiek dostanie "zapłatę" za swoje czyny plis na dzis Na polski [musiałam dać jakiś temat, chodzi o polski]

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

Which is an example of an exothermic process?

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.