6.2b Ex2 FM20 P12 Q19 Composite Rod Greatest Tensile Stress | A Level 9702 Physics (MJ14 P12 Q21)

Example 2 - 9702/12/F/M/20: A composite rod is made by attaching a glass-reinforced plastic rod and a nylon rod end to end, as shown. The rods have the same cross-sectional area and each rod is 1.00m in length. The Young modulus Ep of the plastic is 40GPa and the Young modulus En of the nylon is 2.0GPa.
The composite rod will break when its total extension reaches 3.0mm. What is the greatest tensile stress that can be applied to the composite rod before it breaks? #9702m20p12 #9702s14p12 #ASdeformationP1 #Lv3
(also in 9702/12/M/J/14 question 21)
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[@vinceoldenhof7117]

You explain it so much better than some other KZbinrs who pretty much just read the mark scheme... Thank you

[@youngmile6033]

Well I think I got it

[@humaira6265]

but why dont we directly just put ultimate tensile stress as the subject and not the extension and then calculate ? can u reply fast i have exam ina few days

[@Anonymous_4202]

Can you please solve question 7 of this paper

[@fozanjavaid252]

How did you know that same force is being applied it didn't mention in question

[@ETphysics]

By newton's third law, that is nature of tension kinda forces! Force on one end is same on the other

[@fabricejfd2855]

I still didn't get it why sigma is same for both

[@dumdumdeedee697]

Because they are in series

[@ummehabibasalahuddin4090]

Stress will be same as same force is applied on same area

[@fabricejfd2855]

@@ummehabibasalahuddin4090 thanks it now make sense