1. The problem statement, all variables and given/known data A 60 mL syringe filled with air is connected to a pressure sensor. The latter reads 100kPa. You then push on the piston until it stops moving. You now have 30 mL and the pressure sensor reads 200kPa. What force is used to keep the syringe rubber at the 30 mL mark? 2. Relevant equations P=F/A 3. The attempt at a solution I'm lost. I need the surface of the rubber ( not given) or at least the length of the syringe ( A= V/L) to find the force. A hint please?