Your recovery/recycling machine has r-22 refrigerant in it. you now have to recover refrigerant from a unit with r-410a. what must be done before your recovery unit can be used to recovery r-410a?
a) the recovery unit must be epa certified for use with r-410a. b) the recovery tank must be designed for the pressure of r-410a. c) the filter and lubricant in the recovery unit must be changed, and the recovery unit evacuatedd) all of the above

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.