Suppose the roller coaster in fig. 6-38 (h1 = 33 m, h2 = 13 m, h3 = 25) passes point a with a speed of 2.10 m/s. if the average force of friction is equal to one fifth of its weight, with what speed will it reach point b? the distance traveled is 35.0 m

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)