기 기 W When do comets show tails? They always have tails * Before they lose their last bit of energy When they are approaching the Sun When they are distancing themselves from the Sun it's c when approaching the sun​

The cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false

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.