Problem 9.43 A sign (mass 2300 kg) hangs from the end of a vertical steel grder

Question

Problem 9.43 A sign (mass 2300 kg) hangs from the end of a vertical steel grder with a oss-sectional area of 0.018 m? Ignore the mass of the gider itself The clastic modulus for steel is 20 x 1011 N/m Search windows e Part A What is the stress withln the girder? Express your answer to two significant figures and include the appropriate units. stress Value Units My Answers Submit Part B what is the strain on the girder? Express your answer to two significant figures. Submit My Answers Gbs up Part C the girder is 980 m long how much is itlengthened? Express your answer to two significant figures and include the appeopriate units. At Value Units Submit My Answers Give

Explanation / Answer

9.43

a)

stress=Force/Area=2300*9.81/0.018=1.2535*106 N/m2

b)

since young's modulus is

Y=stress/strain

strain =(1.2535*106)/(2*1011)=6.2675*10-6

c)

since

strain =dL/L

dL=(6.2675*10-6)*9.8

dL=6.14*10-5 m or 0.0614 mm

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