# Joint Entrance Examination/AIEEE 2009/Q083 YOUNGS MODULUS

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| Original Question by 164.100.170.4 Here's the question... 83. Two wires are made of the same material and have the same volume. However wire 1 has cross-sectional area A and wire 2 has cross-sectional area 3A. If the length of wire 1 increases by Δx on applying force F, how much force is needed to stretch wire 2 by the same amount ? (1) 4F (2) 6F (3) 9F (4) F Posted by 164.100.170.4 04:07, 25 September 2009 (UTC) Post a reply! | What's Up? Latest discussions on the forum Mechanics-Help Joint Entrance Examination/AIEEE 2009/Q083 youngs modulus User:Thewinster/HHF/Mechanics-Preload Joint Entrance Examination/AIEEE 2009/Q083 YOUNGS MODULUS Joint Entrance Examination/AIEEE 2009/Q087 ENERGY CONSERVATION Joint Entrance Examination/2000 Screening/Q028 Ball dropped from a height, graphs Physics-Help User:Thewinster/Sandbox/Forum-Watch User:Thewinster/Sandbox Joint Entrance Examination/2000 Screening/Q013 Dimensional analysis Joint Entrance Examination/AIEEE 2009/Q084 work done by electrostatic field Joint Entrance Examination/2000 Screening/Q007 Monoatomic Ideal Gas and a frictionless piston |
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Reply to the thread, posted by 164.100.170.4
Thread post
Additional notes
SOLUTION:[3]
F/A= YΔl/l
⇒ F =YΔlA$^2$/Al
YΔlA$^2$/V
⇒ F ∝ A$^2$
F/F′ =1/9
⇒ F′ = 9F
These comments, along with the notes on the left, were contributed by 164.100.170.4 04:12, 25 September 2009 (UTC) :
Category AIEEE 2009