Q4: The mechanism shown in Figure is in equilibrium for an applied load of P-20 KN. Specifications for the mechanism limit the shear stress in the steel [G=80 GPa) shaft BC to70 MPa, the shear stress in bolt A to 100 MPa. and the vertical deflection of joint D to a maximum value of 25 mm. Assume that the bearings allow the shaft to rotate freely. Using L=1,200 mm, a=110 mm, and b= 210 mm, calculate (a) the minimum diameter required for shaft BC. (b) the minimum diameter required for bolt A. Bearings

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Fire safety

Fire safety is a new domain emerged in the early 90s to enable the design of buildings, structures, and infrastructure against destruction through fire. It also includes the provisions of building codes. This field is mostly associated with the design and efficient planning of a building, to reduce the destruction caused by fire. The branch of engineering that deals with it for the safety of the buildings from destruction of fire, is known as fire safety engineering.