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Unilorin Post-UTME Physics 2022 (Model questions) Question 3

Question 3

Elasticity

A string of length 5m is extended by 0.04m when a load of 0.8kg is suspended at the end. How far will it extend if a force of 16N is applied? [g = 10ms−2]

  1. A.0.04m
  2. B.0.12
  3. C.0.01m
  4. D.0.08m
Show the answer and explanation

Answer: D (0.08m)

Explanation

The load weighs 0.8 × 10 = 8 N. By Hooke's law extension is proportional to force, so 16 N (double) gives 2 × 0.04 = 0.08 m.