A traffic engineer is checking to make sure the light at an intersection is safe for drivers. The speed limit on the road is 30m/s and the width of the intersection is 8m. For an average person reaction time of 1 s and an acceleration of -5m/s^2 he sets the yellow light time at 3 s. Compare the GO zone and the STOP zone and decide if the intersection is safe for drivers

Hydrogen and helium are both members of?

Suppose you increase your walking speed from 7 m/s to 13 m/s in a period of 2 s. what is your acceleration?

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.