Multiple choice

A weighing machine consists of a 2 kg pan resting on a spring. In this condition, the pan resting on the spring, the length of the spring is 200 mm. When a mass of 20 kg is placed on the pan, the length of the spring becomes 100 mm. For the spring, the un-deformed length lo and the spring constant k (stiffness) are

  1. lo = 220mm, k = 1862N / m

  2. lo = 210mm, k = 1960N / m

  3. lo = 200mm, k = 1960 - N / m

  4. lo = 200mm, k = 2156N / m
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B Correct answer
Explanation

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