机械原理第二版课后答案朱理

(mb?rb?)x??m1r1sin30??m2?r2?cos60??m3?r3?sin30???10?300?sin30??10?150?cos60??6.67?100?sin30???1916.5 (mb?rb?)y?m1r1cos30??m2?r2?sin60??m3?r3?cos30??10?300?cos30??10?150?sin60??6.67?100?cos30??721.4

222mb?rb??(mb?rb?)2x?(mb?rb?)y?(?1916.5)?(721.4)?2047.8kgmmmb?rb?2047.8??5.12kgrb?400则 (mb?rb?)y721.4?1??tg?tg?1?20.6?(mb?rb?)x1916.5

2. 在Ⅱ平面内

(mb?rb?)x?m4r4cos30??m2?r2?cos60??m3?r3?sin30?mb???10?150?cos30??5?150?cos60??13.33?100?sin30??1590.5 (mb?rb?)y?m4r4sin30??m2?r2?sin60??m3?r3?cos30?

?10?150?sin30??5?150?sin60??13.33?100?cos30???1053.9

222mb?rb??(mb?rb?)2x?(mb?rb?)y?(1590.5)?(?1053.9)?1908.0kgmmmb?rb?1908??4.8kgrb?400则 (mb?rb?)y1053.9?1??tg?tg?1?33.5?(mb?rb?)x1590.5

mb??

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