What would be the increase in tractive force (negative lift) by the addition of a spoiler to a vehicle. find this for a vehicle traveling at 200 mph and a coefficient of friction between the tires and the ground of 0.6. the density of the air is 0.00238 slugs/ft, the dimensions of the spoiler is 1.5 ft by 4 ft and the lift coefficient is 1.1

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.