Water flows through a horizontal pipe. The pipe consists of two sections of diameters 0.5 m and 0.25 m with a smooth reducing section. The velocity at the upstream section is 2 m/s and velocity at the downstream section is 8 m/s. The pressure difference between the two pipe sections is measured by a mercury manometer. Determine the differential height of mercury between the two pipe sections. Neglect frictional effects.

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature