Midterm+1+sol+spring+2011

# Midterm+1+sol+spring+2011 - cables. If the forces of these...

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Engineering Mechanics 440:221 Department of Mechanical and Aerospace Engineering Rutgers – The State University of New Jersey Instructor: Alberto Cuitino, Kimberly Cook-Chennault, Kathryn Higgins TA: Gulsad Kucuk,Stephen Indyk, Tushar Saraf Midterm Exam 1 Wednesday, February 23, 2011 PLEASE NOTE: Time allowed 60 minutes. The exam is CLOSED TEXTBOOK and CLOSED NOTES. You are allowed to use a scientific calculator; you cannot share your calculator. You need to show your work. Numerical answers without the supporting work will not be considered, so SHOW ALL WORK! You must draw ALL relevant free body diagrams, SEPARATELY from the given figures (i.e. Do NOT draw your FBDs on top of the figures) Please write: Name:___________________________________ Section:____ Please do not write anything below this line SCORES: 1. (30 points) 2. (30 points) 3. (40 points) Total (100 points)

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1. The antenna tower is supported by three

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Unformatted text preview: cables. If the forces of these cables acting on the antenna are F B = 520 N, F C = 680 N, and F D = 560 N a) Determine the magnitude of the resultant force. b) Determine the coordinate direction angles of the resultant force. 2. The lamp has a mass of 15 kg and is supported by a pole AO and cables AB and AC . If the force in the pole acts along its axis, a) Determine the unit vectors along AO , AB , and AC b) Determine the forces along the cables AO , AB , and AC for equilibrium. 3. Two men exert forces of F=80lb and P=50lb on the ropes. a) Determine the moment of each force about A . b) Which way will the pole rotate, clockwise or counterclockwise? c) If the man at B exerts a force P=30lb of on his rope, determine the magnitude of the force F the man at C must exert to prevent the pole from rotating, i.e., so the resultant moment about A of both forces is zero....
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## This note was uploaded on 01/04/2012 for the course STATICS 440:221 taught by Professor Albertocuitino during the Spring '11 term at Rutgers.

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Midterm+1+sol+spring+2011 - cables. If the forces of these...

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