Pdas with two stacks are strictly more powerful than pdas with one stack. prove that 2-stack pdas are not a valid model for cfls by giving an example of a language that is not context-free and yet accepted by a 2-stack pda. describe (no math necessary) how a 2-stack pda would accept that language.

What difference(s) did you notice using a pneumatic circuit over hydraulic circuit.explain why the pneumatic piston stumbles when it hits an obstacle.

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet

Calculate the bore of a cylinder that has a stroke of 18 inches and an extension time of 6 seconds at a flow rate of 4 gal/min.