Question

a long Steel bar under a tensile stress due to a force f as shown for what angle theta the tensile and shearing stress are maximum

Answer 1

Answer:

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Explanation:

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Answer 2

Explanation:

According Problem F is applied along horizontal so resolving into two component one is parallel to inclined one and other is perpendicular to inclined me 

F parallel =F11=Fcosθ

F perpendicular =F⊥=Fsinθ

F⊥ Producer tensile stren , F11 producer shear stren

Area of focus aa1 then sinθ=A1A⇒A1=A/sinθ

Tensile stren on the plane aa1

aa1=A1F⊥⇒A/sinθFsinθ=AFsin2θ

Shearing stren on the plane aa1

Shearing stren =areaParallel force

=A1f11=A/sinθFcosθ=AFsinθcosθ