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Pressure

AP Physics 1· difficulty 2/5

Atmospheric pressure is ≈100 kPa\approx 100~\text{kPa}. The downward force of air on a 0.50 m20.50~\text{m}^2 table top is

  • A

    5000 N5000~\text{N}

  • B

    500,000 N500{,}000~\text{N}

  • C

    50,000 N50{,}000~\text{N}

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  • D

    200 N200~\text{N}

Explanation

F=PA=105⋅0.50=50,000 NF = P A = 10^5 \cdot 0.50 = 50{,}000~\text{N}. (Air pushes up underneath equally, so net downward is small.)

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