It is a 2 meters long vacuum cannon.P = Atmospherics pressure = 101325 Pascalr = 0.02 meters A = (pi)(r)^2F = PAF = (101325)(3.14 X 0.04) = 12732.8750W = Fd = (12732.8750)(2) = 25465.75W = (1/2)(m)(V)^2V = square root((2 X 25465.75)/0.04) = 1128V = 1128 m/s
F = PAF = (101325)(3.14 X 0.04) = 12732.8750
www.phys.csuchico.edu/~lbuchholtz/Papers/VC_AJP.pdfThe above paper says it could be max 287m/s and 4700g (measured with ping-pong balls and photo gates 125-250m/s typically for 0.5 -2m cannon lengths).
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