A rectangular beam has a cross section of b = 14 in., h = 28…

A rectangular beam has a cross section of b = 14 in., h = 28 in., and d = 25.5 in. It is reinforced with two No. 7 Grade 60 bars. The concrete strength is 8,200 psi (normal weight). The beam has Grade 60 No. 3 stirrups. Determine the assumed modulus of elasticity of the concrete, Ec.

The spherical face shield of an astronaut’s helmet is made f…

The spherical face shield of an astronaut’s helmet is made from polycarbonate with a yield strength of 110 MPa. The shield has an outside diameter of 352 mm and a thickness of 5.1 mm. If the shield is successfully pressure tested to 805 kPa on Earth, determine the factor of safety with respect to yielding.