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JAMB Physics 1998 Question 15

Question 15

Pressure

The atmospheric pressure due to water is 1.3 × 106 N m−2. What is the total pressure at the bottom of an ocean 10 m deep? [Density of water = 1000 kg m−3, g = 10 m s−2]

  1. A.1.3 × 107 N m−2
  2. B.1.4 × 106 N m−2
  3. C.1.4 × 105 N m−2
  4. D.1.0 × 105 N m−2
Show the answer and explanation

Answer: B (1.4 × 106 N m−2)

Explanation

Water pressure at 10 m = hρg = 10 × 1000 × 10 = 1.0 × 105 N m−2. Adding the given surface pressure: 1.3 × 106 + 0.1 × 106 = 1.4 × 106 N m−2.