Two boys hang by their hands from the same tree branch. The branch is straight, and grows out from the tree trunk at an angle of 30 degree above the horizontal. One boy, with a mass of 55.00 kg, is hanging 1.70 m along the branch from the tree trunk. The other boy, with a mass of 31.00 kg, is hanging 2.10 m from the tree trunk. What is the magnitude of the net torque exerted on the branch by the children? Assume that the axis is located where the branch joins the tree trunk and is perpendicular to the plane formed by the branch and the trunk.

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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.