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JAMB Physics 1989 Question 10

Question 10

Elasticity

In the figure above W1 = 200 g and W2 = 450 g. Calculate the extension of the spring per unit load. [g = 10 m s−2]

Diagram for this question
  1. A.6.0 × 10−5 m N−1
  2. B.2.5 × 10−4 m N−1
  3. C.6.0 × 10−3 m N−1
  4. D.2.5 × 10−2 m N−1
Show the answer and explanation

Answer: C (6.0 × 10−3 m N−1)

Explanation

Extension per unit load = (6.5 − 5.0) cm ÷ (4.5 − 2.0) N = 0.015 m ÷ 2.5 N = 6.0 × 10−3 m N−1. (The pointer moves down 1.5 scale divisions when the load goes from 200 g to 450 g.)