中学生网络课堂
初二物理 (苏科版下册)
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，容器中装有一定质量的水，先后按甲、乙两种方式将物体a和小玻璃杯漂浮在水面上. 设甲、乙两图中物体a和小玻璃杯共同受到的浮力分别为F甲和F乙，水对容器底的压强分别为P甲和P乙，则（ ）
| A: F甲＜F乙，P甲=Pz |
| B: F甲=F乙，P甲＜p乙 |
| C: F甲=F乙，P甲=P乙 |
| D: F甲＞F乙，P甲＞p乙 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+54mp5L2TQeWSjOWwj+eOu+eSg+adr+mDveaYr+a8gua1ri7mta7lipvnrYnkuo7kuozogIXph43lipvkuYvlkozjgII8L3A+
- 提示2：PHA+55Sy5LmZ5Lik5Zu+77yM5rWu5Yqb55u4562J5o6S5rC06YeP55u4562J77yM5ray6Z2i5LiK5Y2H6auY5bqm55u4562J44CCPC9wPg==
- 提示3：PHA+5rC05rex5bqm5LiA5qC377yM5a+G5bqm5LiA5qC377yM5omA5Lul5rC05a+55a655Zmo5bqV6YOo5Y6L5by65Lmf55u4562J44CBPC9wPg==
- 答案：Qw==
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
本课配套习题挑战模式2/5
多选题
难度系数：
2.将一个实心铁球A和一个密度小于水的木球B放在一个小盒中，再将小盒放在水槽中，漂浮在水面上. 那么下列说法中正确的是（ ）
| A: 只将A从盒中拿出放到水槽的水中，水槽中水面高度不变 |
| B: 只将A从盒中拿出放到水槽的水中，水槽中水面高度下降 |
| C: 只将B从盒中拿出放到水槽的水中，水槽中水面高度下降 |
| D: 将两个小球都从盒中拿出放到水槽的水中，水槽中水面高度下降 |
一次做对，真牛！
+5奖励规则>
- 提示1：IEHmi7/lh7rmnaXmlL7lnKjmsLTkuK3kvJrmsonlupXvvIxC5ou/5Ye65p2l5pS+5Zyo5rC05Lit5LuN54S25ryC5rWu44CC
- 提示2：IOaVtOS9k+a1ruWKm+WPmOWwj++8jOW6lemDqOWOi+WKm+WwseWPmOWwj++8jOa2sumdouWwseS4i+mZjeOAgg==
- 提示3：IOaVtOS9k+a1ruWKm+WPmOWkp++8jOW6lemDqOWOi+WKm+WwseWPmOWkp++8jOa2sumdouWwseS4iuWNh+OAgg==
- 答案：QixE
PGRpdj7lvZMy5Liq55CD5pS+5Zyo55uS5a2Q6YeM5ryC5rWu5rC06Z2i77yM6YKj5LmI5LuW5Lus55qE5rWu5Yqb562J5LqO6YeN5Yqb77yM5o6S5byA55qE5L2T56ev5Li6di4gPGJyPuW9k+aKikHnkIPmi7/lh7rmlL7msLTph4zvvIzmraTml7bvvIxB55CD5b+F54S25LiL5rKJ77yM5omA5Y+X5rWu5Yqb5bCP5LqO6YeN5Yqb77yM5qC55o2u6Zi/5Z+657Gz5b635Y6f55CG77yM5o6S5byA55qE5L2T56ev5Y+Y5bCR77yM5omA5Lul5rC05L2N5LiL6ZmNLiA8YnI+6Iul5oqKQuaLv+WHuuaUvuawtOmHjO+8jOeUseS6jkLnmoTlr4bluqblsI/kuo7msLTvvIzmnIDlkI7lsIbmvILmta7msLTpnaLvvIzmiYDku6Xmta7lipvku43nhLbnrYnkuo7ph43lipvvvIzmjpLlvIDnmoTkvZPnp6/kuI3lj5guIDxicj7mlYXpgIlCRC4gPC9kaXY+
本课配套习题挑战模式3/5
单选题
难度系数：
3.两个完全相同的容器分别盛有质量相等的水，将木块A和金属块B按不同的方式放入水中. A、B静止时的情况如图所示，（设细绳的重量和体积不计）则下列判断正确的是（ ）
| A: 甲图容器底部受到水的压强较大 |
| B: 甲图木块下表面受到水的压强较小 |
| C: 甲、乙图容器底部受到水的压强大小相等 |
| D: 甲图木块受到的重力大于乙图木块受到的重力 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOW6lemDqOWPl+WIsOawtOeahOWOi+WKm++8jOetieS6jua2suS9k+mHjeWKm+WKoOS4iuaJgOaciemXrumimOWPl+WIsOa1ruWKm+OAgg==
- 提示2：IOa2suS9k+mHjeWKm+ebuOetie+8jOeJqeS9k+WPl+WIsOa1ruWKm+ebuOetie+8jOaJgOS7peawtOWvueadr+W6leWOi+WKm+S5n+ebuOetieOAgg==
- 提示3：IOWOi+WKm+ebuOetie+8jOWOi+W8uuebuOetie+8jOa2sumdoua3seW6puS5n+ebuOetieOAgg==
- 答案：Qw==
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
本课配套习题挑战模式4/5
多选题
难度系数：
4.
如图所示，木块A漂在水面上时，量筒内水面对应刻度为V1；当木块上放一金属块B时，A刚好浸没，水面对应刻度为V2. 若将小金属块取下，使其慢慢地沉入量筒底时，水面对应的刻度为V3，下列说法中正确的是（ ）
| A: 木块的重为ρ水gV1 |
| B: 金属块重为ρ水g（V2-V1） |
| C: 木块的密度为 |
| D: 金属块的密度为 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+VjxzdWI+Mzwvc3ViPi1WPHN1Yj4xPC9zdWI+5pivQueahOS9k+enr+OAglY8c3ViPjI8L3N1Yj4tVjxzdWI+MTwvc3ViPuaYr0LmlL7lnKhB5LiK5aSa5o6S5byA5ray5L2T5L2T56ev44CCPGJyPjwvcD4=
- 提示2：PHA+55+l6YGTQueahOS9k+enr++8jOefpemBk0LnmoTmta7lipvvvIjnrYnkuo7ph43lipvvvInjgII8L3A+
- 提示3：PHA+6L+Y5Y+v5Lul6K6h566X5Ye6QueahOWvhuW6puOAgjwvcD4=
- 答案：QixE
PGRpdj7vvJrvvIgx77yJ55Sx56ys5LiA5bmF5Zu+5Y+v55+l5pyo5Z2X5ryC5rWu77yM5LiUVjxzdWI+5o6SPC9zdWI+77ycVjxzdWI+MTwvc3ViPu+8jDxicj7miYDku6VHPHN1Yj7mnKg8L3N1Yj49RjxzdWI+5rWu5pyoPC9zdWI+Pc+BPHN1Yj7msLQ8L3N1Yj5nVjxzdWI+5o6SPC9zdWI+77ycz4E8c3ViPuawtDwvc3ViPmdWPHN1Yj4xPC9zdWI+77yM5pWFQemAiemhueS4jeato+ehru+8mzxicj7iiLXPgTxzdWI+5pyoPC9zdWI+Z1Y8c3ViPuacqDwvc3ViPj3PgTxzdWI+5rC0PC9zdWI+Z1Y8c3ViPuaOkjwvc3ViPu+8jDxicj7iiLTmnKjlnZfnmoTlr4bluqY8aW1nIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMjMvN0UvckJBQ0UxTU1adWVnMS1EeEFBQURSQjdOUmpRMzQwLnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8yMy83RS9yQkFDRTFNTVp1ZWcxLUR4QUFBRFJCN05SalEzNDAucG5nIiBoZWlnaHQ9IjQ4IiB3aWR0aD0iNjciPu+8jOaVhUPpgInpobnkuI3mraPnoa7vvJs8YnI+77yIMu+8ieeUseesrOS4gOOAgeesrOS6jOW5heWbvuWPr+efpe+8jOW9k+acqOWdl+S4iuaUvuS4gOmHkeWxnuWdl0Lml7bvvIzlpJrmjpLlvIDmsLTnmoTkvZPnp6/kuLrvvIhWPHN1Yj4yPC9zdWI+LVY8c3ViPjE8L3N1Yj7vvInvvIw8YnI+5q2k5pe25LuN5ryC5rWu77yM5omA5LulRzxzdWI+6YeRPC9zdWI+PUY8c3ViPua1rumHkTwvc3ViPj3PgTxzdWI+5rC0PC9zdWI+Z++8iFY8c3ViPjI8L3N1Yj4tVjxzdWI+MTwvc3ViPu+8ie+8jOaVhULpgInpobnmraPnoa7vvJs8L2Rpdj48ZGl2Pjxicj7vvIgz77yJ6YeR5bGe5Z2X55qE6LSo6YeP5Li6PGltZyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzAwLzhGL3JCQUNGRk1NWnVmeVMyTDlBQUFFaldOVjN6bzAyMC5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvOEYvckJBQ0ZGTU1adWZ5UzJMOUFBQUVqV05WM3pvMDIwLnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjEzMyI+PC9kaXY+PGRpdj7nlLHnrKzkuIDjgIHnrKzkuInluYXlm77lj6/nn6XvvIzph5HlsZ7lnZfnmoTkvZPnp6/kuLrvvIhWPHN1Yj4zPC9zdWI+LVY8c3ViPjE8L3N1Yj7vvInvvIw8YnI+5omA5Lul6YeR5bGe5Z2X55qE5a+G5bqm5Li6PGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzIzLzdFL3JCQUNFMU1NWnVmal9PUmxBQUFGdEY0RGp6bzE5Ny5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjMvN0UvckJBQ0UxTU1adWZqX09SbEFBQUZ0RjREanpvMTk3LnBuZyIgaGVpZ2h0PSI1NiIgd2lkdGg9IjEyMyI+77yM5pWFROmAiemhueato+ehri48YnI+5pWF6YCJQkQuPC9kaXY+
本课配套习题挑战模式5/5
多选题
难度系数：
5.
装有一定量水（水的密度为ρ0）的烧杯放在水平桌面上，现将一边长为l的正方体木块放入水中如图甲所示，静止时木块上表面到水面的距离为h1；将一小石块放在木块上，如图乙所示，静止时木块上表面到水面的距离为h2；若将石块系在木块下放入水中，如图丙所示，静止时木块上表面到水面的距离为h3. 则下列判断正确的（ ）
| A: 石块的质量m=ρ0（h3-h2）l2 |
| B: 石块的体积V=（h3-h2）l2 |
| C: 石块的密度 |
| D: 石块完全浸没水中所受到的浮力F浮=ρ0g（h1-h2）l2 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6YCa6L+HaDxzdWI+MTwvc3ViPuWSjGg8c3ViPjI8L3N1Yj7lj6/ku6XmsYLlh7rmnKjlnZflpJrmtbjmsqHnmoTkvZPnp6/vvIzlsLHlj6/ku6XmsYLlh7rnn7PlnZfnmoTotKjph4/jgII8YnI+PC9wPg==
- 提示2：PHA+5LmZ5ZKM5LiZ5Zu+5Lit77yM5rW45rKh5oC75L2T56ev55u4562J77yM6YCa6L+HaDxzdWI+Mjwvc3ViPuWSjGg8c3ViPjM8L3N1Yj7lj6/msYLnn7PlnZfkvZPnp6/jgII8YnI+PC9wPg==
- 提示3：PHA+55+l6YGT5L2T56ev77yM55+l6YGT6LSo6YeP5Y+v5Lul5rGC5a+G5bqm44CCPGJyPjwvcD4=
- 答案：QixD
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
