Physics

The stylus of a phonograph record exerts a force of 7.7 x 10-2N on a…

The stylus of a phonograph record exerts a force of 7.7 x 10-2N on a groove of radius 10-5m. Compute the pressure exerted by the stylus on the groove
  • A.
    2.45 x 108 Nm-2
  • B.
    3.45 x 108 Nm-2
  • C.
    4.90 x 108 Nm-2
  • D.
    2.42 x 108 Nm-2
Correct Answer: Option A
Explanation

Pressure P = F/A
= F/πr2

= 7.7 x 10-2
    π x (10-5)2

= 7.7 x 10-2
    π x 10-10

= 2.45 x 108 Nm-2