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Four solid steel rods, each of length and cross-sectional area , equally support an object weighing . The weight of the object causes the rods to contract by . The rods obey Hooke’s law. What is the Young modulus of steel?
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and cross-sectional area 
, equally support an object weighing 
. The weight of the object causes the rods to contract by 
. The rods obey Hooke’s law. What is the Young modulus of steel?
