A metal bar is elongated by 2mm when put under a certain amount of tension. How much will it be elongated if the tension is doubled?

Question

Jessie Chase

Physics

5 January, 03:38

A metal bar is elongated by 2mm when put under a certain amount of tension. How much will it be elongated if the tension is doubled?

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Answers (1)

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Jamir Ward · Answer 1

Answer: 4mm

Explanation: From Hooke's law.

Tensile force is directly proportional to the elongation

That's

F = k e ， where k is constant

F/e = k

F1/e1 = F2/e2

Where e1 = 2mm

F2 = 2F1 (doubled)

F1/2 = 2F1/e2

1/2 = 2/e2

e2 = 4mm

Therefore when tension is doubled, the metal bar will be elongated by 4mm