Fluid Mechanics  The three-arm lawn sprinkler shown in the figure receives water through the center. if the torque due to collar friction is 0.9 N-m, determine the minimun flow rate of the water (in m^3/h) required to overcome this torque and spin the sprinkler.

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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.