a boat travel due East with at 40metre per second across a river flowing due South 30metre per Second. what is the resultant speed of the boat

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat

Sunidhi made a study chart about changes in states of matter. which headings best complete the chart?

Am i correct on these two physics questions?