length of the paper l = 11.5 in = 11.5*0.0254 = 0.292
m
width of the paper b = 8.45 in = 8.45*0.0254 = 0.215 m
area of the paper A = l*b = 0.292*0.215 = 0.0628
m^2
atmospheric pressure P = 1.013*10^5 Pa
force F = P*A
F = 1.013*10^5*0.0628
F = 6361.64 N<<<----------answer
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