4-77. Three bars, each made of different materials, are connected together and placed between two walls when the temperature is T₁ = 12°C. Determine the force exerted on the (rigid) supports when the temperature becomes T₂ = 18°C. The material properties and cross-sectional area of each bar are given in the figure. Steel Est = 200 GPa ast = 12(10-6)/°C Ast Brass Ebr 100 GPa abr = 21(10-6)/°C = 200 mm² Abr = 450 mm² -300 mm- -200 mm Prob. 4-77 Copper Ecu = 120 GPa αcu = 17(10-6)/°C Acu = 515 mm² 100 mm

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Hydrogen Energy

Energy is a quantity that cannot be defined, its existence can only be felt. In simple language, if a system possesses energy, it can do a specific kind of work. There are many forms of energy sources which people can use to obtain work. Solar energy, tidal energy, hydroelectric energy, geothermal energy, wind energy are some of the renewable energy sources which are primarily used for the production of electricity.