given
time t = 7 sec
number of molecules N = 5*10^23
area A = 5.6*10^-4 m^2
speed v = 380 m/s
mass m = 4.65*10^-26 kg
change in in speed V = 380-(-380) = 760 m/s
force f = ma = 5*10^23*4.65*10^-26*760/7 = 2.52 N
pressure p = f/A = 2.52/5.6*10^-4 = 4.5 kPa
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