For Problems 9 16, select 7 of the 8 problems to be graded. Indicate the problem

Question

For Problems 9 16, select 7 of the 8 problems to be graded. Indicate the problem which is not to be graded by choosing "F". If you do not indicate which problem is to be skipped, then problem 16 will automatically be omitted when graded. (10 pts) Problem f19: A 15 in round solid steel rod with an outer diameter of 0.75 in is stretched between two rigid walls. The coefficient of thermal expansion is 6.5x10 joF and E is 29x10 psi. If the tensile load is 2.0 kips at 80°F; the tensile load at 0°F is most near: A) 6860 lbs B) 7800 lbs C) 8660 lbs D) 2865 lbs E) None of the above F) Skip (10 pts) Problem #10: compressive stress is 110 For the beam shown blow, the maximum permissible MPa and the maximum permissible tensile stress is 75 MPa. The maximum safe distributed load w that can be plied is: 600 mm A) 170 kN/m

Explanation / Answer

Diameter = 0.75 in

Length =15 in

K=thermal expansion coefficient =6.5*10^-6

E=29*10^6

Tensile load=2.0 at 80F

area=0.4416

(stress/strain)=E

tensile load at 0F =2.0/[1-(6.5*10-6)] =2.000013

cheers :)

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