北京市西城区2013年中考物理二模试题(扫描版).doc

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北京市西城区2013年中考物理二模试题（扫描版）24题详解由杠杆平衡条件(L-a)/L*mgcos*(L-a)/2=0g2ascos*（L-a)+a/L*mgcos*a/2m=40as=m/v=40as/Ls=40a/L 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