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

It is the review problem on p.131 of Physics for scientists and engineers ( Serway, 4th edition).

It is the classical problem of 2 blocks in an incline(with angle [itex]\theta[/itex]) with masses 2m and m (in order from bottom to the top of the incline) and 1 block suspended trough a pulley with mass M.

He asks to find M and give the answer as function of m, g, [itex]\theta[/itex].

2. Relevant equations

I got to 2 equations, they are:

[itex]Mg =4ma+3mg\cos\theta[/itex]

and

[itex]a=\frac{g(M-3m\cos\theta)}{M+3m}[/itex]

I couldn't get to something that wasn't a form of M^{2}+... and it get very strange.

Some tip?

3. The attempt at a solution

It is above.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Simple newtonian mechanics problem

**Physics Forums | Science Articles, Homework Help, Discussion**