A50-kg toboggan is coasting on level snow. as it passes beneath a bridge, a 20-kg parcel is dropped straight down and lands in the toboggan. if ke1 is the original kinetic energy of the toboggan and ke2 is the kinetic energy after the parcel has been added, what is the ratio ke2/ke1

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)