You are driving a car behind another car. both cars are moving at speed 80 km/h. take the reaction time of the driver in car 2 is 0.60 s. assume car 2 brakes are just a bit harder than car 1 brakes. what minimum distance behind the car in front should you drive so that you do not crash into the car's rear end if the driver of that car slams on the brakes?

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)