At a point on the surface of an elliptical exercise machine the material is in bioxiol stress with og= 3,300 psi, and oy = -1,400 psi, as shown in the figure part a. The figure part b shows an inclined plane aa cut through the same polint in the material but oriented at an angle 0. (a) (b) Determine the value of the angle 0 between zero and 90" such that no normal stress acts on plane aa. Round your answer to two decimal places. 0 = O• Round your answers to nearest whole number. psi psi

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