500 π न्यूटन का वजन एक केबल से लटका हुआ है जिसकी लंबाई 10 m, व्यास 2 cm और E = 200 GPa है, तो केबल का दीर्घीकरण ____ है। 

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HPPSC AE Civil 2015 (MPP-PPCL) Official Paper
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  1. 0.05 cm
  2. 0.025 cm
  3. 1/π 
  4. 1 cm

Answer (Detailed Solution Below)

Option 2 : 0.025 cm

Detailed Solution

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अवधारणा:

केबल का दीर्घीकरण निम्न द्वारा दिया जाता है,

L = \(\frac{PL}{AE}\)

E = प्रत्यास्थ मापांक, P = लागू भार, L = केबल की लंबाई

A = अनुप्रस्थ काट का क्षेत्रफल, δL = दीर्घीकरण

स्पष्टीकरण:

दिया हुआ है कि:

E = 200 GPa = 200 × 109 Pa

P = 500π N, L = 10 m

A = \(\frac{\pi}{4}\times (\frac{2}{100})^2\) m2 

∴ δL = \(\frac{PL}{AE}\)

= \(\frac{500\pi \;\times\; 10}{\frac{\pi}{4\;}\times \;(\frac{2}{100})^2 \;\times\; 200\;\times\; 10^9}\)

= \(\frac{1}{4000}\) m = 0.025 cm

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