3 ms·
When a weight is at rest, the tension in the rope must be less then or equal to half the weight. The problem asks which weight will be first to not be at rest.
by cynicalkane 16y ago
When a weight is at rest, the tension in the rope must be less then or equal to half the weight. The problem asks which weight will be first to not be at rest. The answer should now be obvious.
- lazyant 16y agoWhen a weight is at rest the tension in the rope is exactly half its weight. Problem asks which weight would be first to raise (not "not be at rest" that could be going down) so that's why I'm supposing the guy can pull the whole thing. I'm also saying the first one is C (closer to guy).
- cynicalkane 16y agoThe tension in the rope is greater than 30lbs, yet only one weight moves? I give up.
- lazyant 16y agosorry; I made an edit with a clarification. Basically if the weights are at rest on the floor then mkn's answer is the correct one. If they are at rest on the air, then my answer is the correct one.
- loup-vaillant 16y agoNo: http://news.ycombinator.com/item?id=1659676 http://news.ycombinator.com/item?id=1659676 (this comment assumes that the weights are unsupported).
- lazyant 16y agoI supposed the system was at equilibrium without making the numbers. If it's not (as it seems) then sure, my reasoning is invalid and he's right, no problem.