A spring obeying Hook's law has an unstretched length of 50mm and a spring constant of 400 Nm -1. What is the tension in the spring when its overall length is 70mm?
Correct answer: A. 8.0N
- A. 8.0N
- B. 28N
- C. 160N
- D. 400N
Explanation
In order to find the displacement x we subtract the untstrected length from the overall length. The stretched length is equal to displacement x.70-50=20F = kxF = 20*10-3*400F = 8 N
This question appeared on the ETEA MDCAT 2014 paper, which you can sit online with every answer explained.
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Deformation and elasticity describe how solids change shape or volume under an applied force and return to their original form when the force is removed. Work includes stress, strain, Hooke’s law, elastic limit, Young’s modulus and elastic potential energy, while elastic deformation must be distinguished from permanent plastic deformation.
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