what is the efficiency of a gasoline-electric hybrid that combines 184 KJ of mechanical energy and 356 KJ of sound and heat energy the energy input was 540KJ​

What is a possible result of higher air temperature caused by global warming

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?

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.