The grains of wood in the board make an angle of $20$ with the horizontal as shown. Using Mohr's circle, determine the normal and

shear stresses that act perpendicular and parallel to the grains if the board is subjected to an axial load of $P=270N.($Figure $1)$

Figure

Part A

Determine the normal stress.

Express your answer to three significant figures and include the appropriate units.

Part B

Determine the shear stress.

Express your answer to three significant figures and include the appropriate units.

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