Adriver complains that the brake pedal slowly moves toward the floor when the vehicle is stopped at traffic lights. pumping the pedal temporarily returns the pedal to the proper height. also, the brake fluid has been checked and is at a normal height in the reservoir. technician a says that a bad master cylinder could be the cause of the problem. fluid could be leaking internally in the cylinder. technician b says that a leaking wheel cylinder could be allowing pressure to drop. who is correct? a. a only. b. b only. c. both a and b. d. neither a nor b.

What are chlorofluorocarbons and what impact do they have on the atmosphere?

What is created when solids,liquids,an gases mix with one another

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)