Seatwork: Show your complete solution. Use 4 decimal places.  Thermal Stress:  In the LRT II project, steel railroad rails of 20 meters long are to be installed. If lowest temperature considered is 22 ℃ and a maximum temperature of 36 ℃ is designed for, and the modulus of elasticity of steel to be 207000 MPa, determine the clearance between rails such that adjoining rail will just touch at maximum design temperature.

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Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.