2019/4/25,1,作 业,P218 综合题 6. 7. 13. 16.,复习: P198218 预习: P220235,2019/4/25,2,第二十讲 定积分的应用（二）,一、几何应用(续),二、物理应用,2019/4/25,3,（五）旋转体的侧面积,用切线MT绕x轴 旋转所得圆台的 侧面积近似,2019/4/25,4,2019/4/25,5,解,2019/4/25,6,2019/4/25,7,二、物理应用,（一）引力问题,解,2019/4/25,8,2019/4/25,9,向量加法,解,13,b,2019/4/25,10,2019/4/25,11,2019/4/25,12,（二）变力做功问题,功的微元,2019/4/25,13,解,9,2019/4/25,14,（三）静力矩和质心,1. 质点系的质心,2019/4/25,15,2019/4/25,16,质量微元,2. 平面曲线的质心,2019/4/25,17,2019/4/25,18,3. 平面薄板的质心,2019/4/25,19,2019/4/25,20,解,2019/4/25,21,2019/4/25,22,2019/4/25,23,解,2019/4/25,24,2019/4/25,25,
