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Mechanical Properties of Solids question bank (Physics)

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Q1.

One end of a wire of length $L$ and weight $W$ is attached to a ceiling,and the other end is attached to a weight $W_1$. If the cross-sectional area of the wire is $S$,what is the stress at a distance $3L/4$ from the lower end of the wire?

(A)

$\frac{W_1}{S}$

(B)

$\frac{W_1 + (W/4)}{S}$

(C)

$\frac{W_1 + (3W/4)}{S}$

(D)

$\frac{W_1 + W}{S}$

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Q2.

$A$ wire of length $l$ and cross-sectional area $A$ is stretched by a weight $Mg$ such that its length becomes double. What is the stress in the wire?

(A)

$Mg/A$

(B)

$Mg/2A$

(C)

$2Mg/A$

(D)

$4Mg/A$

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