Because we grew up in a pressurized system, our bodies have developed so that al

Question

Because we grew up in a pressurized system, our bodies have developed so that all pressures interior to our body are relatively close to atmospheric pressure. With small pressure differentials, we have a difficult time gauging the magnitude of atmospheric pressure. Consider a person lying on his stomach, with sheets of paper stacked on his back. If each sheet of paper has a mass of 0.00280 kg and is the standard letter size 8.5" Times 11" (0.216 m Times 0.279 m), how many sheets would stack to produce a pressure on his back equal to atmospheric pressure (roughly 101325 Pa)?

Explanation / Answer

Le N is the no of sheets required

P = Force/Area

= N*m*g/A

N = P*A/(m*g)

= 101325*0.216*0.279/(0.0028*9.8)

= 222531 <<<<<<<------------Answer

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