1.

4. A uniform rod of mass m, length L, area ofcross-section A and Young's modulus Yhangs from the ceiling. Its elongation under its* own weight will beVmgLmgL2mg(1) Zero2AYAYs. The diagram shows a force-extensionAy(4)

Answer»

3) is correct answer

Hook’s Law: Stress = Young’s Modulus × strain

⇒F/A=Yδ/L⇒δ=FLAY

dδ=dFxAY

dF= centrifugal force due to mass of the element of length dx

=dMxω2=MLxdxω2

dδ=MLdxω2x.xAY

δ=∫L0Mω2LAYx2dx=Mω2L23AY

3) is the right answer of the following

2) is the correct answer

4) is the correct answer



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