A composite beam is fabricated by bolting two 2.1-in-wide by 10-in-deep timber planks to the sides of a 0.3-in. by 10-in. steel plate. The moduli of elasticity of the timber and the steel are 1630 ksi and 30000 ksi, respectively. The simply supported beam spans a distance of 12 ft and carries two concentrated loads P, which are applied as shown. Assume LAB = LcD = 3 ft, LBc= 6 ft, b = 2.1 in., d = 10 in. and t- 0.3 in. (a) Determine the maximum bending stresses o;, o, produced in the timber planks and the steel plate if P = 2.2 kips. (b) Assume that the allowable bending stresses of the timber and the steel are 1340 psi and 24200 psi, respectively. Determine the largest acceptable magnitude for concentrated loads P. (You may neglect the weight of the beam in your calculations.) P |P B C D LAB LBC LCD Cross section

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.