Ipe ( pronounced ee-pay ) is a brazilian hardwood that can be used as a durable (and expensive! ) construction material for decks, docks and other outdoor projects. every cubic foot of ipe weighs 69 pounds. use dimensional analysis to convert the density of ipe to g/cm^3. how does the density compare to other woods and material on the list above?

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)