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Unformatted text preview: ENGRD 2020 – MECHANICS OF SOLIDS Prelim I Examination Tuesday, February 24, 2009 Academic integrity is expected of all students at all times whether in the presence or absence of members of the teaching staff. If you understand this and agree that you will neither give, nor use, nor receive unauthorized aid in this examination, please sign the Academic Integrity space on the examination booklet. Thank you. • Please turn off your cell phone. No calls are to be made or received. • 1. Please sketch - as carefully as you can - the free body diagrams for the following structures. 20 Points (a) - 5 (b) - 5 (c) - 10 For the first two, you should NOT solve for any reactions, etc. We only want the FBD ’s . (a) The figure at right shows a mechanism in the form of a frame ABCDE made of rigid elements with dimensions shown and which is supporting a weight W at end D and is acted on by a spring at E . The weights of the elements compared to the applied loads are negligble. The joint at C is a pin sliding in a frictionless groove. The horizontal spring of spring constant k connects the frame at point E to the wall at F . Draw the free body diagram for this frame. A mechanism supporting a load. 1.22*L A B C D k W 0.6L 1.1*L L/2 L/4 F E L (b) The figure at right shows a crane-like structure comprised of beam ABC of linear...
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