The drag coefficient for a newly designed hybrid car is predicted to be 0.21. the cross-sectional area of the car is 30 ft2. determine the aerodynamic drag on the car when it is driven through still air at 55 mph.

Nitrogen (n2) undergoes an internally reversible process from 6 bar, 247°c during which pν1.2 = constant. the initial volume is 0.1 m3 and the work for the process is 121.14 kj. assuming ideal gas behavior, and neglecting kinetic and potential energy effects, determine heat transfer, in kj, and the entropy change, in kj/s. show the process on a t-s diagram.