(4 pts) A bicycle pump has a barrel 65 cm long. On the upstroke, air is drawn into the pump at a pressure of 1 atm. On the downstroke, the air in the barrel is compressed. How long must the downstroke be to increase the pressure of the air in the barrel to 4 atm

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

True or false graphs must include scales that increase by the same amount

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