A thermally operated contact mechanism is shown. If heated above the ambient temperature of 20°C (where EB is vertical) to a specified temperature the contacts at E and F will meet. EB is rigid while DC is made of aluminum (E = 68.9 GPa) and BA is bronze (E = 103 GPa). If the specified temperature is 110°C find the required spacing s needed. Use aA = 24x106/°C and aer=17.1x10/°C. 1. %3D Ans: 0.7425 mm 200 mm 400 mm 300 mm

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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.