求以下列曲线为界的均匀薄板的质心坐标:[tex=8.571x1.357]TYZO38wVeR16nX/f46E4nFuxVX9f8BSsKgmK7r8M9lQ=[/tex]
质量和对Oy轴、Ox轴的一次矩分别为[tex=27.071x2.857]GVmh6R2hmE4rOKQOAVUIfrGc8Nt3LOQAM3kooyTZ4T0Hfa3vrYarMpn7/Uehfbx26xKF7a+e2QqI8q6HSiSFNxFrQfO99qMJoS/0RmNKiqNncbBU/qZ+9tWa2bXpZpTJgBx4Qi+NuexHRQNsK68reHFjm9rK/TQPa4XB4VzX2FNPNLKBrDzjormRyaVaifWk5slT2/3Ju2/P3RWx8aiw7UDmzYk3rptsr8F2YKiMdx6WZxY/8q7HuoZYKdWvFKye[/tex][tex=48.714x2.929]5mIOaF7oCVEs2FaUY1QT6Oe2v7CSF+JpIgXJdjcLL8R/8vgVIcs6lj4nT9MoZp3U6Sad87XYwAk6ueJwOUK3PXo9/LfhOlMsRF6PfEWL6gh4IVHu7tHnp+ry1gSn1zbjSWIlqOQDHyEGsvSANkfocNPjrTgQd7cVzYh1mkfxn4fiYLI2c/wNODPxY4Lbi54Us9DLp37z3cJIwKwvFaqjCtCZnOET9W9OX8A1fqD/oNGXS8sDmkBMTLmLTLXIrx90A6b4wdsA+hq3rL2F0WdUs+wJ6c/R3lack2aQtjyLmoVwcuJtNOxNNnlJjytrRh64Y74+G7jco+6TDNTLoR3011MsiaHjeicJytOIj2jQ4eFqvTFWjgWDKF2cvuL1fu1xyqRGiiziPdR2+ckjwMiJA3vzbIG/9PPLOIbmA0lJ4icX39d8wR5Huowz1fapnoshCKh5lyYm37+W9NPkdBo1vQ==[/tex][tex=33.571x5.786]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[/tex][tex=42.286x3.0]upL1W8Gq/2fHQu3IMRVmkR6Pps0xqNhA8Av52LlL3PUA0+SkBSfYa8swSMa9mcy24ExXDp3xgLotGOK4psCt1CowcuLxSOzu1MQW4C/6r6wq8OS/T1sqyrRtVBNGWqDRxnOQ0IPHCySfj9SB6JlAder7UhNJV3y+gpQzmoYvV19emBs8KcEFyhRqwGAv/Jx6CBbIrZ1Diy0hQ3V8mWuCeOK64A9TnL/8ws+W1QK2bt3yTTtonfWPTtverB5feiroRZWYg0zU0Eaj/eHbItL99NO8fpC093hgn5mZeq5n1ngCfRu2BOab/jrjA/srReYjkYJiwxjD8TNkfTstuklUQ8yz7eq+LWE91AEqlwpnQ30XFihmxw/qLmyzEoVhvYyr2XdpQ/9I4+LGgIvCb+TkU86N6+zmYMK9cl9ugTtL8Zc=[/tex]于是,质心的纵坐标为[tex=6.0x2.429]uvRJX34KTURA90IR2dk5XkevqrS/LYlb6kOmU9Ndibt3rHdPbdAW+1QrdbEw+JGz[/tex].由对称性知,[tex=3.143x1.0]uDxMOA1/JSIzZX7P4jv25g==[/tex]
举一反三
- 求以下列曲线为界的均匀薄板的质心坐标:[tex=14.357x1.714]1BBD6hHqOM5KMBcPcZuCAblXpTLqR0zirLCcxcegRP5kqSg+hy8Os9FXThyVoFPB+RlFQNtYREOTH4rnCvoSmw==[/tex]
- 求以下列曲线为界的均匀薄板的质心坐标:[tex=10.0x1.5]YrYonaDGUnAtNuaGUsfGJ9kCEC5eKb7Tln4hdH8iwTc=[/tex]
- 求以下列曲线为界的均匀薄板的质心坐标:[tex=10.357x1.5]DvX+IzsPWOqsCQGm3dPZkKi0Ape8GUB5lowYvQA3JLkcxEkhgt0qbhqr5R5a1rQu[/tex]
- 求下列曲线所围成的均匀薄板的质心坐标 :[tex=11.0x1.5]/IvfOGB9YQ1VoCtTiQ7GboUAI7pdrCHcjwCHHXZdO4A=[/tex]
- 求下列曲线所围成的均匀薄板的质心坐标 :[tex=10.357x1.357]hzlHzEjAGwE5NT8LxECxjh8wOHxEb2qbqok9Nhj+3GPkVQGwAsNlthh/skiybxXU[/tex]
内容
- 0
求下面曲线所界薄板的质心坐标:[tex=2.786x1.429]/1M/qWk56WIOhhKuRNPImQ==[/tex],[tex=6.786x1.357]2RUj78oQttwvG17Pdu0FPg==[/tex];
- 1
求以下曲面为界的均匀物体的质心坐标:[tex=7.929x1.429]63HeFUgOTq9EmIMDqFz26VfZB6Zo+wPnnYZt+oUaqhQ=[/tex]
- 2
求以下曲面为界的均匀物体的质心坐标:[tex=20.286x2.357]oQoW/JqsRkjOZEn7/fo7XPRVxOeMCWJZd2dnc2+bt9mhPxW2QMHb6F4Q3weFELNlU9vJtTKPoQMbFhdKlVZ8UrFQz3mAKeOd2ZBzzlPk6uI=[/tex]
- 3
求一下曲面为界的均匀物体的质心坐标:[tex=15.071x1.429]pMkYC8xld7o0yHmN2fQr7x6kQHTqD7WLsrTSq5pCraxYaodPDNXEF96Jz89vOwBA[/tex]
- 4
圣代的斟出温度应符合标准() A: 8℉~10℉ B: 10℉~16℉ C: 16℉~18℉ D: -8℃~-6℃ E: -9℃~-8℃ F: -9℃~-7℃