2. The horizontal rigid beam ABCD is supported by vertical bars BE and CF and is loaded by vertical forces P, = 400 kN and P2= 360 kN acting at points A and D, respectively (see figure). Bars BE and CF are made of steel (E = 200 GPa) and have cross-sectional areas ABE = 11,100 mm? and ACF = 9,280 mm? . The distances between various points on the bars are shown in the figure. Determine the vertical displacements 8, and 8, of points A and D, respectively. A D. E1.5 m 1.5 m 2.1 m P = 400 kN 2.4 m P2 = 360 kN 0.6 m

Q: TA 70% G 1 m 70% B +1.40m- 0.8 m I m -1.40 m--- 0.8 m (a) (b) (c) Figure 2

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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.