Two steel guitar strings, P and Q, are made of the same alloy.
String P has an original length LLL, diameter ddd, and is subject to a tension force TTT. Under this tension, string P extends by a distance xxx.
String Q has an original length 3L, diameter 2d2d2d, and is subject to a tension force 2T2T2T.
Which statement is correct?
The stress in Q is double the stress in P.
The strain of Q is half the strain of P.
The extension of Q is 3x3x3x.
The value of stressstrain\frac{\text{stress}}{\text{strain}}strainstress for Q is 1.51.51.5 times that of P.
20 exam-style questions on AQA A Level Physics Materials, covering Bulk properties of solids and The Young modulus. Each one has a worked solution and a mark scheme showing where the marks go.