{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

midterm

# midterm - University Number(please write very clearly...

This preview shows pages 1–7. Sign up to view the full content.

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 A B A AB BY AB BX V R R V V R R V V R ω ω ω ω 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, / / / B A B A B A V r ω = × G G G written as r ω (3) Assuming / B A ω ω = without proving it (4)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}