sweetnsimple786 Posted September 18, 2009 Report Share Posted September 18, 2009 (edited) So I've been trying to solve the same problem for over 90 minutes, and I'm pretty frustrated. The set up is you have a ramp and a pulley coming off from each end. The attached document has the image. m1 = m2 = .20kgThe angle is 7o = xAcceleration, a, is 2.0m/s2 in the direction of the first mass falling downT1 is found to be 1.56N and T2 is found to be 2.36N. Use 9.8m/s2 as g. To find m3, I set up this equation:m3a = m3gsinx + T1 -T2But when I went to solve for m3, I got a negative number... grr. I've asked so many people but they either haven't done it or can't find anything wrong with my equation. Any help? Edited September 18, 2009 by sweetnsimple786 Link to post Share on other sites More sharing options...
Nabih Posted October 24, 2009 Report Share Posted October 24, 2009 I think you are right but there is a mistake in the question. The acceleration couldn't be 2 m/s squaredIf you take the system as a whole and frictionless incline then the acceleration of motion shoud be a = gsinx which is usual irrespective of the mass. and this value is 1.19 then there is a mistake in either the acceleration or in the angle. the angle is 12 and not 7. 1 Link to post Share on other sites More sharing options...
sweetnsimple786 Posted October 25, 2009 Author Report Share Posted October 25, 2009 (edited) Okay. I don't remember what I did for this lab... I think we redid it and got different numbers or something. Thanks for trying to help. Edited October 25, 2009 by sweetnsimple786 Link to post Share on other sites More sharing options...
Survival Robot Posted February 3, 2010 Report Share Posted February 3, 2010 <div class="message info">This topic has been <strong class='bbc'>closed</strong> by a moderator.</div><strong class='bbc'>Reason:</strong> <em class='bbc'>The question no longer needs solving. </em>If you disagree with this action, please report this post, and a moderator or administrator will reconsider it.Kind regards,IB Survival Staff Link to post Share on other sites More sharing options...
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