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JAMB Physics 2003 Question 9

Question 9

Pressure

The stylus of a phonograph record exerts a force of 7.7 × 10−2N on a groove of radius 10−5m. Compute the pressure exerted by the stylus on the groove.

  1. A.2.45 × 108 Nm−2
  2. B.3.45 × 108 Nm−2
  3. C.4.90 × 108 Nm−2
  4. D.2.42 × 109 Nm−2
Show the answer and explanation

Answer: A (2.45 × 108 Nm−2)

Explanation

Area = πr2 = 3.14 × 10−10 m2; P = 7.7 × 10−2 ÷ 3.14 × 10−10 ≈ 2.45 × 108 N m−2.