蘭大《工程力學(xué)》2020年9月考試在線考核試題答案

1、工程力學(xué)19秋學(xué)期在線考試試題-0001試卷總分:100 得分:20一、單選題 (共 5 道試題,共 20 分)1.如圖所示，邊長(zhǎng)a=20cm的正方形勻質(zhì)薄板挖去邊長(zhǎng)b=10cm的正方形，y軸是薄板對(duì)稱軸，則其重心的y坐標(biāo)等于( )圖A.圖B.yC=10cmC.圖D.yC=5cm答案:A2.圖示結(jié)構(gòu)，用積分法計(jì)算AB梁的位移時(shí)，梁的邊界條件為（ ）圖A.yA0 yB=0B.yA0 yB0C.yA=0 yB0D.yA=0 yB=0答案:D3.圖示結(jié)構(gòu)，用積分法計(jì)算AB梁的位移時(shí)，梁的邊界條件為( )圖A.yA0 yB=0B.yA0 yB0C.yA=0 yB0D.yA=0 yB=0答案:D4.關(guān)于

2、平面力系的主矢和主矩，以下表述中正確的是( )A.主矢的大小、方向與簡(jiǎn)化中心無(wú)關(guān)B.主矩的大小、轉(zhuǎn)向一定與簡(jiǎn)化中心的選擇有關(guān)C.當(dāng)平面力系對(duì)某點(diǎn)的主矩為零時(shí)，該力系向任何一點(diǎn)簡(jiǎn)化結(jié)果為一合力D.當(dāng)平面力系對(duì)某點(diǎn)的主矩不為零時(shí)，該力系向任一點(diǎn)簡(jiǎn)化的結(jié)果均不可能為一合力答案:D5.圖示長(zhǎng)度為l的等截面圓桿在外力偶矩m作用下的彈性變形能為U，當(dāng)桿長(zhǎng)為2l其它條件不變時(shí)，桿內(nèi)的彈性變形能為( )圖A.16UB.8UC.4UD.2U答案:D二、主觀填空題 (共 10 道試題,共 20 分)6.物體相對(duì)于地球處于靜止或勻速直線運(yùn)動(dòng)狀態(tài)，稱為#。答案:平衡7.構(gòu)件保持#的能力稱為穩(wěn)定性。答案:原有平衡狀態(tài)8

3、.力偶對(duì)任意點(diǎn)之矩都#。答案:相等9.平面一般力系可以向平面內(nèi)任意一點(diǎn)簡(jiǎn)化為一個(gè)力和一個(gè)力偶，其中#與簡(jiǎn)化中心的具體位置無(wú)關(guān)。答案:力10.受力后幾何形狀和尺寸均保持不變的物體稱為#。答案:剛體11.合力在任一軸上的投影等于各分力在同一軸上投影的#。答案:代數(shù)和12.#答案:<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGUAAAAgCAYAAAAL6bYQAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAO/SURBVG

4、hD7Zq/cuIwEMY/7lmAgskTmCe4S5OKNp1dhibdFclMujR2Gbq0VGmwn+DyBAxF5Hfx7cqyke0VhibobvSbUTDWH6/2k1ZSzKQiEPCKH+Yz4BFBFA8JonhIEMVDgige4okoJbIko78B5ihKkWAymYgpKUwZokjkMt2UwKoyTrnDYXGLaf2FBFoe21pSW4Ja59hh2y1CfR4tcw34nMLkMfi8IqS4yk2ZBpXGdD+qUmVuWKg0qhD3a5yG26vbUlUa0/OadlVexQ4bNLnDDl1Ptq9FpVU0VuZKGFFyckZKLunBnR

5、YcrB0fCeUZ6mx6kSYshGkrp7r9RrXzUEWC97QdDsFUmspCauiZEYvttShKdDDPnqEmpkOdDMuxl0JOj096pp4tkih6dtt28IA4w8t5HFUxJecMvDJmTZmaeG5T4GMT4+6n+dqicPik7lgZZXaPbbsmdCmLDMmyjvHLjK7153GRKHcHLG6lmjYRVoMybJ9tR4nidQuMtUXryAt+43FB19ECs/quk+fnZ3P1jRhxBjjXBh3Heep3k1S0Di9NiFD1yO6EjDNmmCOEynaMjHwOhSbsaltcIdji6enJXH0fji1xiR

6、0NuvRxME1Q8PCMUlBnWFBKCmkUYdEfcjQiZ2tqQ/3Bgx68U8wWtDrgBvNmMHd2XRK0E3sB8rehHeXXnv7GIBFqO1SKKL7DsGQDtXW/xer9gZ5XQle/mQ+efZWZ0UMWhZxF5guRQOrMFPNVv2yB5NeGtHs3gtQojntWyBgLXUXyCry/CY7mQaNj6DFvOsdqMDKOFMkM689PrGccSvnaZFj4IIhGz5ceHHakhVVPf6oiRZMOOrT0Q0l/wT4dunib7H6Oe/EXIXuiTmPD+hympHQNBFF4d+XYKmpnj28jpXhdry

7、+WoCd2XbUgndq0W27OMsSIHcdzj/7SriMtjsF1TSFshqJIndDQWYa3wmcsjvWCTjNFF2SH0pmBHFXfo2u633GcRSPeILXPNVtywQ5Fh8aUt7omT/EMERZ/fja3KQ0KL0WRQtfQUSOzhWeBPpxRiKDhqB2k26DzgVZKDl1OQShpm/QMkfPtFNMg4JnQ3msFrMOWXfacQfbdhNfBHuLJf4kDNkEUDwmieEgQxUOCKB4SRPGQIIqHBFE8JIjiIUEUD3GIwj/zSZBJv+1p4Ne8lH/Rb7W4TlZcVodKF1KdktpKMv

8、HnR/86sij8kmuzx+HEO0FQ7uZDnSzRp/zaYnPg12J9Tomr8LF+wU4osN8DM2qszBIs/xuBgL/sZ7h2qfI16AAAAABJRU5ErkJggg="/>13.圖所示點(diǎn)的應(yīng)力狀態(tài)，其最大切應(yīng)力是 。圖#答案:<span style="font-size:14px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">100MPa</span>14.物體相對(duì)于地球處于靜止或勻速直線運(yùn)動(dòng)狀態(tài)，稱為#

9、。答案:平衡15.#答案:<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAALoAAAAzCAYAAAAgsRLhAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAARQSURBVHhe7Z29cuIwFIWv91kgBZMnwE8AaVxtS2eX0KTLTJIZum3sEjrarWjWfgLyBJkUsd/Fe2WLn4AgxhbEQueb0eAfIl/LR0dXwjNxcoYAuHF+yU8AbhoIHVgBhA6sAEI

10、HVgChAyuA0IEVQOjACiB0YAUQOrACbb+MOo4jtwB+bG4fcHRgBVodHU4G2gocHViBFqHDzUHbaYWjJ4FTdBbHcSnK5MGWY2LMNvPzQk8CWnp5MSKkIdFkFFHrdWNizJajZTKqL3VJKHCW5OUzGsgj7cfEmO2jsaNrz899zzzBmBizZbRq1SWLPsmbmSWZS8ecRa6cC8gSJPJMDTjl0laXYbRH6PwQRvRwNWcsJpNNH7TGmDOuyz0aj08xj5pi5MybdKrBrKwjj7lGu2iH0IXTLD1ajTvCwii6tNHw9YZzuV0

11、XTTFnSUSB69CI61oYNpqZxI8LvRiahermw3I47X7Q3UWfN08ep+/Ul3t10BHzVuB39LjIacUi5y4DLkQjoYuHrJ6IZuVQzA9ykw/uFzlMd8YrOZyuyxmrF+IaZy5iJ8GUeosnupf7KpJgLy8uyna9vFHMGXe0QuBE3lrgjRVevb1t5QKOnlHkdqnLjvf2Jg8p8L0fGKZZDNPegkS2cQzh1sO5IvD+b3poIshC4C65rPBS4GMaaLHw67T36+ur3DKTk0LfdYRqlI0+eeuTH8aUbhyPJz/9cGc/p+unoxzbtEe

12、LUyrndOLP3aKILw05ufHjTbz5aqwltTihxRq0ub1bBjeCEnFqt6g4OB77xTE/lvs7xD7XozrRBL5eP+THWQEW7k5cce6L+zoaT5qzzpX30ZQ05Wtz3X0/zOMKoYu4ucdxxApqt/d395/nLy8vcqtkf980jjo6n9sUQRVXT5Y8QWMneVS4R7fHDvn+yR5Un+37JbKI4XrS/XrMCXi6uUcW0ejjqbqrZf/oL6nvoymdzoBmq5wWHtFy5JAbRJTUbJRLtbfpaYoSofbvEF/b/+rhn5YuoXbY0iF/ytFLVyzv4bD

13、08/0qhBtWHSmakop7KBw+5lY65LijN2nv444unFtVTKeS0AVrYazZ3S450bgnhthGnJG6fOXU0F2eK06JNCPUHbSaQvCKeI4LvUl7n7r/rdhvCY2rLh16+M3D5XxIwWYsznh+F5DLKQYL0owJUfZJ7/wxH3Ia1F2SN75O0J3BrFhqrM7l2vv5+Vlu3Q6Vhc6dovgUefAxxPpyGvr0PlznzSOafvToKc3LXxBNoHNXrrH3fQpTfW8kHryzoipnrnVfsr1vTexnvaYrGnPNGX8GGiA6SHdyT7HW14DFq8VDmov

14、lU0vWHc9KXSBuYCpn5+gQOzCRWpNRiP3azGlYM4/gnjjsqiH0xZ5yBbwP4yAFWhcXgSgvUDowAogdGAFEDqwAggdWAGEDqwAQgdWAKEDK4DQgRVA6MAKIHRgBRA6sAIIHVgBhA4sgOg/SoefsRdbvtQAAAAASUVORK5CYII="/>三、計(jì)算題 (共 3 道試題,共 45 分)16.圖答案:<img src=" title="1582251665163033337.png" alt="image.png"/>17.圖答案:<img src=" title="1582251830233094613.png" alt="image.png"/>18.試用截面法求ACB梁A處的剪力和彎矩