# Hibbeler dynamics help

1. Aug 2, 2010

### aero10

1. The problem statement, all variables and given/known data

20-7
If the top gear B rotates at a constant rate of $$\omega$$, determine the angular velocity of gear A, which is free to rotate about the shaft and rolls on the bottom fixed gear C.

2. Relevant equations
V=$$\omega$$ x r
Va=Vb + $$\omega$$ x r

3. The attempt at a solution
I'm really having trouble figuring out how to start...I keep getting answers with i (and I know I am doing my cross products right, and I should be getting answers with j and k.

2. Aug 2, 2010

### Staff: Mentor

I think we need a drawing or sketch, before we'll be of much help on this one.

Welcome to the PF, BTW.

3. Aug 2, 2010

### aero10

Last edited by a moderator: May 4, 2017
4. Aug 2, 2010

### aero10

I got the answer in the back of the book, but I am not confident on the methods by which I got it. So if anyone needs help on this question, I will be able to give concrete reasoning after tomorrow.

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