midterm - University Number (please write very clearly) _...

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University Number ( please write very clearly ) ______________________ Surname________________ Answers for ENGG1010 Quiz, Part B- Dynamics , 20 October 2009 Answer both questions. Write your answers on this question sheet and submit this sheet only . QB1 . Bar AB is hinged to the edge of a circular disk which rolls clockwise at constant angular speed ω . The disk radius is R and the length of the bar is 2 R . Point B of the bar slides along the plane ground. Determine the speed of B at the moment shown, when point A is level with the disk centre C. Answer ( you may continue on the back of this page but it’s highly unlikely that you would need such space ) Ans: () ( ) ,, , , 0, hence , and 2 AB A A B BY AB BX VR R V V R R VV R ωω ω == + = Common mistakes: (1) Velocity treated as a combination of scalar and vector, like V=2+(3,4)=(5,6). (2) Confusion over cross product, // / BA Vr G G G written as r (3) Assuming / = without proving it (4) Assuming 0 C V = while actually it should be
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This note was uploaded on 09/24/2011 for the course ENGG engg1010 taught by Professor Wong during the Spring '11 term at HKU.

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midterm - University Number (please write very clearly) _...

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