# lecture15 - TEST 1) bring a pencil 2) don't use a pen on...

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TEST 1) bring a pencil 2) don't use a pen on the scan sheet , the computer actually won't read it (ie: you get 0!) 3) code in your student number correctly in the little circles 4) answer question 1, which will tell us the correct version 5) don't wait until time is called and expect to get extra time to transfer your answers to the scan sheet 6) 9 MC and 4 long

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Answer to first  question is version  number 0 6 1 2 3 4 5 J .   P S t u d e n Multiple-choice answer sheets: HB pencil only; ink will not work Fill circle completely No extra marks in answer area Erase well to change an answer
Centre of Mass Serway 12.1-12.2; and parts of 9.5 Centre of Mass, Centre of Gravity

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Example: The uniform beam (weight 400 N, length L) is supported by a pin at one end, and a scale that can be placed anywhere along the beam. What will the scale read if it is scale a) at the end of the beam (shown)? b) at the centre of the beam? c) at distance ¼ L from the pin? d) at distance ¾ L from the pin?
Where should we choose the “pivot point” when calculating torques? Answer: In Statics problems , it doesn’t matter. Theorem : If the net force on a body is zero , then the total torque due to all forces will not depend on the choice of “pivot point”. In particular, if F net = 0, then if τ net = 0 for one “pivot point”, τ net is also zero for every other pivot point.

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The centre of mass is an “average position” of the mass. x
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## This note was uploaded on 10/14/2011 for the course ENGINEER CHEM ENG 3 taught by Professor Ghosh during the Spring '11 term at McMaster University.

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lecture15 - TEST 1) bring a pencil 2) don't use a pen on...

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