中学生网络课堂
初二物理 (苏教版下册)
物体的浮与沉
本课配套习题挑战模式1/5
单选题
难度系数：
1.如图所示，三个相同的容器内水面高度相同，甲容器内只有水，乙容器内有木块漂浮在水面上，丙容器中悬浮着一个小球，则下列四种说法正确的是（ ）
| A: 三个容器对水平桌面的压力相等 |
| B: 三个容器中，丙容器对水平桌面的压力最大 |
| C: 如果向乙容器中加人盐水，木块受到的浮力变大 |
| D: 如果向丙容器中加人酒精，小球受到的浮力不变 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOacgOmHjeimgeadoeS7tizkuInkuKrnm7jlkIzlrrnlmajlhoXmsLTpnaLpq5jluqbnm7jlkIwu
- 提示2：IOmrmOW6puebuOWQjCzljovlvLrnm7jlkIws5ray5L2T5a+55a655Zmo5bqV6YOo5Y6L5Yqb55u45ZCM
- 提示3：IOa1ruWKm+WPmOWMluaDheWGtemAmui/h+S4iuWNh+i/mOaYr+S4i+ayieWIpOaWrS4=
- 答案：QQ==
PGRpdj7lpoLmnpzlkJHkuZnlrrnlmajlhoXliqDlhaXnm5DmsLQs5ray5L2T5a+G5bqm5Y+Y5aSnLOacqOWdl+S4iua1rizmta7lipvov5jnrYnkuo7ph43lipss5rWu5Yqb5LiN5Y+YLuWmguaenOWQkeS4meWuueWZqOWGheWutumFkueyvizmtrLkvZPlr4bluqblj5jlsI8s5bCP55CD5LiL5rKJLOa1ruWKm+WHj+Wwjy7ku6XkuLrmtrLpnaLmt7Hluqbnm7jlkIws5a+55a655Zmo5bqV6YOo5Y6L5Yqb55u45ZCMLOaJgOS7peaVtOS9k+S4ieS4quWuueWZqOWvueahjOmdouWOi+WKm+ebuOetiS48L2Rpdj4=
本课配套习题挑战模式2/5
多选题
难度系数：
2.如图所示，物体M是一个边长为L的正方体，其受到的重力为G，放入水中处于漂浮状态，M的下表面距液面的高度为h，露出水面的体积为物体体积的1/5,若用一个竖直向下的力F1压物体M，使其浸没在水中静止后，物体M受到的水竖直向上的力为F2，则下列说法中正确的是（ ）
| A: 物体M漂浮时，受到的浮力为ρ水ghL2 |
| B: F1与F2是一对平衡力 |
| C: 物体M浸没后，水对它的作用力的合力小于G |
| D: 竖直向下的压力F1和物体M的重力GM之比为1：4 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOa1ruWKm+etieS6js+BPHN1Yj7msLQ8L3N1Yj5nVjxzdWI+5o6SPC9zdWI+
- 提示2：IEY8c3ViPjE8L3N1Yj4rRz1GPHN1Yj4yPC9zdWI+LOawtOeahOWQiOWKm0Y8c3ViPjI8L3N1Yj7lpKfkuo5H
- 提示3：IEY8c3ViPjE8L3N1Yj7nmoTlipvkvb/niankvZPmtbjmsqExLzUs5omA5Lul5rW45rKhNC8155qE5pe25YCZ6ZyA6KaBNEY8c3ViPjE8L3N1Yj7nmoTlipss5q2j5aW95piv6YeN5Yqb55qE5aSn5bCPLg==
- 答案：QSxE
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
本课配套习题挑战模式3/5
多选题
难度系数：
3.
如图所示，有两个小球M和N，密度分别为ρM和ρN. 图甲中，细线的一端固定在杯底，另一端拴住小球M使其浸没在水中静止；图乙中，细线的一端固定在杯底，另一端拴住小球N使其浸没在油中静止. 小球M所受重力为GM，体积为VM；小球N所受重力为GN，体积为VN. 小球M和N所受细线的拉力大小相等，所受浮力分别为FM和FN. 已知水的密度为ρ水，油的密度为ρ油，且ρ水＞ρ油＞ρN＞ρM，则下列判断中正确的是（ ）
| A: GM＜GN |
| B: VM＞VN |
| C: FN＜FM |
| D: FN＞FM |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5Lik5Zu+5Lit5ZSv5LiA55qE562J6YeP5YWz57O75piv57uz5a2Q5Y+X5Yiw5ouJ5Yqb55u4562JLDwvcD4=
- 提示2：PHA+57uz5a2Q55qE5ouJ5Yqb562J5LqO54mp5L2T5omA5Y+X5rWu5Yqb5YeP5Y6754mp5L2T6YeN5YqbPC9wPg==
- 提示3：PHA+6YCa6L+H5a+G5bqm5YWz57O75YWI5Yik5pat5Lik54mp5L2T5L2T56ev5YWz57O7LjwvcD4=
- 答案：QSxE
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
本课配套习题挑战模式4/5
单选题
难度系数：
4.木块A漂浮在容器中的水面上，它的上面放有一块石块B，如图所示，此时木块A排开水的体积为V1. 若将石块B从木块A上取下，放入水中，静止时，木块A和石块B排开水的总体积为V2. 已知V1-V2=2分米3，木块A的体积为4分米3，石块B的密度为3×103千克/米3，g=10牛/千克. 则容器底对石块B的支持力为（ ）
| A: 10牛 |
| B: 20牛 |
| C: 30牛 |
| D: 40牛 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNruS4pOenjeeKtuaAgeWIl+a1ruWKm+etieS6jumHjeWKm+eahOetieW8jy4=
- 提示2：IOmAmui/h+S4pOS4quetieW8j+ebuOWHj+axguWHuueJqeS9k0LnmoTkvZPnp68u
- 提示3：IOefpemBk+S9k+enr+WPr+S7peaxgkLnmoTmta7lipvlkozph43lipsu
- 答案：Qg==
PGRpdj48aW1nIHdpZHRoPTU1NCBoZWlnaHQ9Mjk1IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvOEIvckJBQ0ZGTU1aZkR6WWFrU0FBQlhpRjZwbGZRMDIuanBlZyI+PC9kaXY+PGRpdj4=
本课配套习题挑战模式5/5
单选题
难度系数：
5.
如图所示，在盛有某液体的圆柱形容器内放有一木块A，在木块的下方用轻质细线悬挂一体积与之相同的金属块B，金属块B浸没在液体内，而木块漂浮在液面上，液面正好与容器口相齐. 某瞬间细线突然断开，待稳定后液面下降了h1；然后取出金属块B，液面又下降了h2；最后取出木块A，液面又下降了h3. 由此可判断A与B的密度比为（ ）
| A: h3：（h1+h2） |
| B: h1：（h2+h3） |
| C: (h2-h1）：h3 |
| D: (h2-h3）：h1 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6aaW5YWI6KaB5piO56Gu5Li65LuA5LmI5LiL6ZmNLOaYr+S7gOS5iOW8lei1t+S6hua2sumdouS4i+mZjS48L3A+
- 提示2：PHA+6YCa6L+H5ray6Z2i5LiL6ZmN5Y+v5Lul5rGC5ray5L2T5a+55a655Zmo5bqV55qE5Y6L5YqbLjwvcD4=
- 提示3：PHA+5Y6L5Yqb5Y+Y5YyW562J5LqO5rWu5Yqb5Y+Y5YyWLueUqOa1ruWKm+WPmOWMlumHj+axgueJqeS9k+mHjeWKmy48L3A+
- 答案：QQ==
PGRpdj7orr7lrrnlmajnmoTlupXpnaLnp6/kuLpT77yM57uG57q/5pat5byA5ZCO77yM5pyo5Z2X5YeP5bCP55qE5rWu5YqbRjxzdWI+5rWuPC9zdWI+PHN1Yj4xPC9zdWI+Pc+BPHN1Yj7mtrI8L3N1Yj5nVjxzdWI+5o6SPC9zdWI+PHN1Yj4xPC9zdWI+Pc+BPHN1Yj7mtrI8L3N1Yj5nU2g8c3ViPjE8L3N1Yj49RzxzdWI+Qjwvc3ViPi3PgTxzdWI+5rayPC9zdWI+Z1NoPHN1Yj4yPC9zdWI+Pc+BPHN1Yj5CPC9zdWI+Vmctz4E8c3ViPua2sjwvc3ViPmdTaDxzdWI+Mjwvc3ViPu+8mzxicj7miYDku6XPgTxzdWI+Qjwvc3ViPlZnPc+BPHN1Yj7mtrI8L3N1Yj5nU2g8c3ViPjE8L3N1Yj4rz4E8c3ViPua2sjwvc3ViPmdTaDxzdWI+Mjwvc3ViPu+8mzxicj7lvZPmnKjlnZfmvILmta7lnKjmtrLpnaLkuIrml7bvvIzlj5fliLDnmoTmta7lipvnrYnkuo7oh6rouqvnmoTph43lipvvvIxGPHN1Yj7mta48L3N1Yj48c3ViPjI8L3N1Yj49RzxzdWI+QTwvc3ViPj3PgTxzdWI+5rC05rayPC9zdWI+Z1NoPHN1Yj4zPC9zdWI+Pc+BPHN1Yj5BPC9zdWI+VmfvvJs8YnI+5omA5LulPGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzAwLzhCL3JCQUNGRk1NWmZXeTY1S0NBQUFIZG1ad0FObzIwOS5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvOEIvckJBQ0ZGTU1aZld5NjVLQ0FBQUhkbVp3QU5vMjA5LnBuZyIgaGVpZ2h0PSI1MCIgd2lkdGg9IjE3NiI+77yb5YiZQeS4jkLnmoTlr4bluqbmr5TkuLpoPHN1Yj4zPC9zdWI+77ya77yIaDxzdWI+MTwvc3ViPitoPHN1Yj4yPC9zdWI+77yJLjxicj7mlYXpgIlBLjwvZGl2Pg==
