A car engine injects gasoline (assume octane C8H18), which is evaporated and then mixed with air in a ratio of 1:15 by mass. In the cylinder the mixture is at a pressure of 750 kPa, 650 K when the spark fires. At that moment, find the partial pressure of the octane and the specific volume of the mixture.

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?