Aperson riding a unicycle is biking along a sidewalk. the person rides over a slight drop in the sidewalk that has a vertical displacement of 1 cm. if the combined mass of the bicycle and person is 50 kg, what are the values for the parallel spring-damper system in the bicycle for the person to experience motion that is critically damped?

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0