A research balloon of total mass 'M' is descending vertically with a downward acceleration 'a'. How much mass 'm' must be thrown from the balloon to give it an upward acceleration 'a', assuming that the upward lift of the air does not change?

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.