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March 26, 2017

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The highest that George can suck water up a very long straw is 2.0 m. (This is a typical value.)
What is the lowest pressure that he can maintain in his mouth?

  • Physics - ,

    The weight of the water must equal the difference in pressure.

    atmospheric pressure-his pressure=weight 2M water.

    101.3kPa*area-hispressure*area=area*2m*densitywater*g
    101.3kpa-hispressure=
    2m*10^3kg/m^3*9.8N/kg
    his pressure=101.3kpa-18.6kPa
    check my figuring.

  • Physics - ,

    you's the best

  • Physics - ,

    Sorry, I meant you are the BEST

  • Physics - ,

    There is an error. 2*9.8=19.6, not 18.6
    change that.

  • Physics - ,

    oh i figured that...thanks again

  • Physics - ,

    82kPa

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