A rigid block (neglect its weight) is to be supported by three equally spaced rods (spaced by a distance a), each of which has Young's modulus E, cross section area A and length L. The rods are to be pinned to the block, but during assembly it is found that one of the bars is slightly too long; before it is attached its pin-hole extends a small distance s beneath the corresponding hole in the block. To finish the assembly, the ʻover-sized bar' is compressed and attached to the block, and then the assembly is released. (1) Find the force that is induced in each of the three bars in terms of parameters E, A, L, s and a (note that you may not need all of them). (2) After the assembly, we increase the temperature of the first and the third rod (temperature of the second rod is kept the same). The thermal expansion coefficient is a. Is it possible to achieve zero forces in the first and third rod (F1 = F3 = 0) during the heating process? If yes, find the required temperature increase AT, in terms of E, A, L, s, a and a (note that you may not need all of them). If no, explain the reason.

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General safety guidelines

Safety guidelines are the set of rules and codes that must be followed in the workplace for the occupational safety of workers, the machines, and the equipment that are present inside the workshop premise. There are many unsafe conditions and hazardous materials inside the workshop that makes prey for certain risk factors associated with health conditions. Extreme safety precautions must be taken inside the work area just like the precautions and practices that are been followed for Corona Virus Disease 2019 (COVID-19). People can also educate themselves by joining various health programs and camps. These will provide them with the necessary skills and knowledge about safety awareness. Occupational Safety and Health Administration (OSHA) thrives to create a safe and healthy environment for the workers working in the industries and provides them with proper education and training.