In a stressed body - anelementary cube of material istaken at a point with its facesperpendicular to X and Yreference axes. Tensilestresses equal to 15 kN/cm2and 9 kN/cm2 are observed ontheses respective faces. Theyare also accompanied byshear equal to 4 kN/cm2. Themagnitude of the principalstresses at the point are

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In a stressed body - anelementary cube of material istaken at a point with its facesperpendicular to X and Yreference axes. Tensilestresses equal to 15 kN/cm2and 9 kN/cm2 are observed ontheses respective faces. Theyare also accompanied byshear equal to 4 kN/cm2. Themagnitude of the principalstresses at the point are