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8. mechanical properties of solids — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics8. mechanical properties of solids1 Mark
MCQ
When a $4\, kg$ mass is hung vertically on a light spring that obeys Hooke's law, the spring stretches by $2\, cms$. The work required to be done by an external agent in stretching this spring by $5\, cms$ will be ......... $joule$       $(g = 9.8\,metres/se{c^2})$
  • A
    $4.90$
  • ✓
    $2.45$
  • C
    $0.495$
  • D
    $0.245$
✓

Answer

Correct option: B.
$2.45$
b
(b) $K = \frac{F}{x}$$ = \frac{{40}}{{2 \times {{10}^{ - 2}}}} = 0.2\;N/m$

Work done$ = \frac{1}{2}K{x^2} = \frac{1}{2} \times (0.2) \times {(0.05)^2} = 2.5\;J$

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