Two blocks are connected by a string over a pulley. The hanging block has a mass of 8-kg and the one on the plane has a mass of 2-kg. The coefficient of kinetic friction is ɱk = .23. (A) What is the acceleration of the blocks? (B) What is the tension in the string connecting the blocks?

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.

How much energy will be transferred to your eardrum while listening to this sound for 1.0 min?

What is part of a line has one endpoint and continues in one direction?