A gas cylinder has a volume of 0.4 m? It contains butane at a pressure of 100 kPa and a temperature of 20°C. What pressure is needed to compress the gas to a volume of 0.05 m² at the same temperature?

In what direction does the medium move relative to the direction of the wave? explain.

First answer marked as brainiest which is the correct equation describing the first law of thermodynamics? a) when the internal energy of a system changes, it equals the amount of heat added plus the work done. b) when work is done by the piston, it is equal to the heat added plus the change in internal energy of the system. c) when heat is added to the system, it is equal to the amount of work done by the piston plus the change in internal energy of the system.

Which statements did both aristotle and ptolemy assume? check all that apply.