Achild gets on a shallow playground slide. after pushing himself to get started down the slide he slides at a constant speed all the way to the bottom. compare the change in gravitational potential energy of the child to the work done on the child by friction.

Iwill give 30 points to whoever answers ! what is the formula for actual mechanical advantage and ideal mechanical advantage?

Of is j/kg·k. if a 2.6 kg of isk to k, is ?

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.