Explanation The stop sign is in the form of regular hexagon shape, and the stop sign is represented in Figure 1. Different raw materials are used to make the stop sign, they are: 1. Plywood. 2. Aluminum. 3. Steel. Among these materials, steel material is highly preferred to make the sign. Steel material is highly economical by comparing with plywood and aluminum. Steel material is sturdy and it doesn’t need reinforcement process. Rusting on steel can also be avoided and prevented coating the steel blank using zinc. Consider the following typical dimensions of the stop sign: The length of one side of the hexagon ( L ) is 30 cm , The height of the hexagon ( h ) is 50 cm , The thickness of the stop sign ( t ) is 0.3 cm . Refer to the Figure 2, which shows the dimensions of the hexagon and its angle difference. Formula to calculate the area of hexagon is, A = 3 3 2 L 2 (1) Here, L is the length of one side of hexagon. Substitute 30 cm for L in equation (1) to find A . A = 3 3 2 ( 30 cm ) 2 = 3 3 2 ( 900 cm 2 ) = 2338.27 cm 2 Formula to calculate the volume of hexagon is, V = A × t (2) Here, A is the area of hexagon, t is the thickness of the stop sign. Substitute 2338.27 cm 2 for A , and 0.3 cm for t in equation (2) to find V . V = ( 2338.27 cm 2 ) ( 0.3 cm ) = 701.5 cm 3 Formula to calculate the density of the steel material is, D = m V (3) Here, m is the mass of the steel material used to make 1 stop sign, V is the volume of the hexagon

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ISBN: 9780357126592

Author: MOAVENI

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Highway Safety

Proper highway safety refers to the methods or rules that prevent highway travelers from being killed or severely injured. Proper highway safety measures help to protect motorists, cyclists, pedestrians, passengers on public transport, and so on.

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Chapter 7, Problem 19P

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Estimate how much material is needed to make 100000 stop signs.

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PROBLEM 1 Find the reaction at A and F. Compute for the force in members AB, BD, and DF. Use Method of Joints OR Method of Sections OR both. 3m B D C E 3m 100KN 3m 4m

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