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The force on a phonograph needle is 1.2 ...

The force on a phonograph needle is 1.2 N. The point has a circular cross-section whose radius is 0.1 mm. Find the pressure (in atm) it exerts on the records.
Given: 1 atm `=1.013xx10^(5)Pa`

Text Solution

Verified by Experts

`P=(F)/(A)=(F)/(pir^2)`
`=(1.2)/(3.14xx(10^(-4))^(2))Pa`
`=(1.2)/(3.14xx10^(-8)xx1.013xx10^(5))atm`
`=377atm`
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