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8.Mechanical Properties of Solids
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$Y$ યંગ મોડયુલસ ધરાવતા તારમાં પ્રતિબળ $S$ છે,તો એકમ કદ દીઠ ઊર્જા કેટલી થાય?
A
$\frac{{2Y}}{{{S^2}}}$
B
$\frac{{{S^2}}}{{2Y}}$
C
$\frac{S}{{2Y}}$
D
$\frac{{{S^2}}}{Y}$
(IIT-1992) (AIIMS-1997) (AIEEE-2005)
Solution
(b) Given,
Young's modulus $=Y$
Streaching stress $=S$ Energy stored per unit volume is, $=\frac{1}{2} \times$ stress $\times$ strian
We know that, stress $=$ strain $\times Y$
Therefore energy per unit volume will be
$E=\frac{1}{2} \times S \times \frac{S}{Y}=\frac{S^{2}}{2 Y}$
Standard 11
Physics
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