What is the kinetic energy of an automobile with a mass of 1252 kg traveling at a speed of 12 m/s?

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.

If you let go of the notebook after lifting it, will it move? how?

How is an electron dot structure used to represent a covalent bond?