(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

http://img187.imageshack.us/img187/9476/dib.th.png [Broken]

m_{A}= 22kg

m_{A}= 10kg

No friction

At t = 0, at rest

a.- Find a_{B}

b.- Find v_{B/A}at t = 0.5s

2. Relevant equations

3. The attempt at a solution

http://img504.imageshack.us/img504/3786/dib3.th.png [Broken] http://img504.imageshack.us/img504/9979/dib2.th.png [Broken]

I got to the following equations:

m_{A}·a_{A}= m_{A}·g·cos(30) + N_{B}·sin(50)

0 = N_{A}- m_{A}·g·sin(30) - N_{B}·cos(50)

m_{B}·a_{A}·sin(30) = N_{B}- m_{B}·g·cos(20)

m_{B}·a_{B/A}- m_{B}·a_{A}·cos(50) = m_{B}·g·sin(20)

There must be something wrong in these because after solving my results are wrong.

I don't know if I chose the wright base for studying each body (maybe the equations would be simpler with some other base?).

Thanks for your help!

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