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The pressure exerted by a phonograph needle on a record is surprisingly large. If the equivalent of 1.00 g is supported by a needle, the tip of which is a circle 0.200 mm in radius, what pressure is exerted on the record in N/m2?

  • Physics - ,

    p=F/A= mg/πr²=
    =0.001/3.14•0.0002²=7958 Pa

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