An air-traffic controller observes two aircraft on his radar screen. the first is at altitude 850 m, horizontal distance 19.1 km, and 25.5° south of west. the second aircraft is at altitude 1300 m, horizontal distance 17.6 km, and 15.0° south of west. what is the distance between the two aircraft? (place the x axis west, the y axis south, and the z axis vertical.)

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)