At a point in an elastic material, there are two mutually perpendicular planes, one of which carries a direct tensile stress of 50N/mm^2 and a shear stress of 40N/mm^2, while the other plane is subjected to a direct compressive stress of 35N/mm^2 and a complementary shear stress of 40N/mm^2. Required:
Determine the principal stresses at the point, the position of the planes on which they act, and the position of the planes on which there is no normal stress.

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myelin is the substance of the central nervous system (cns) that insulates nerve cell axons to increase the speed at which nerve impulse travels. myelination is a process of myelin formation. this process occurs postnatally, begins in the embryo during the midst of early development and finishes after birth.

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