中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.
如图中甲所示，两个实心长方体A、B叠放在水平面上，已知密度之比ρA：ρB=2：1，底面积之比SA：SB=1：2，高度之比hA：hB=3：2. 将B放在水平地面上，A叠放在B上面，如图甲所示，B对地面的压强为pB；若把B叠放在A上，如图乙所示，B对A的压强为pB′，则pB：pB′为（ ）
| A: 2:1 |
| B: 1:2 |
| C: 5:4 |
| D: 4:5 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 提示2：PHA+PGltZyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0ZELzVEL3JCQUNGRk1KNUt2aUptLUhBQUFEdUJjWWZJSTE0MC5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvRkQvNUQvckJBQ0ZGTUo1S3ZpSm0tSEFBQUR1QmNZZklJMTQwLnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjE3NyI+PC9wPg==
- 提示3：PHA+PGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzIwLzQ3L3JCQUNFMU1KNUt2aXJQSmdBQUFEbkJRUG14QTU3NC5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjAvNDcvckJBQ0UxTUo1S3ZpclBKZ0FBQURuQlFQbXhBNTc0LnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjE3MSI+PC9wPg==
- 答案：Qw==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.
在水平地面上放着a、b两个长方体木块，如图甲所示，它们底面积之比为3：4，对地面的压强分别为pa：pb=2：3. 现把a叠放在b上后，如图乙所示，此时b对地面的压强为p′b，则pb与p′b之比是（ ）
| A: 2:3 |
| B: 1:2 |
| C: 3:4 |
| D: 9:8 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 提示2：PHA+6KaB5rGC5Ye66YeN5Yqb5q+U77yM5qC55o2u5bey55+lRj1wU++8jOWPr+S7peaxguWHujxicj48L3A+
- 提示3：PHA+5YiZPGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0ZELzVEL3JCQUNGRk1KNUtfaU1NdDdBQUFDbVNYLUp2bzg4NC5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvRkQvNUQvckJBQ0ZGTUo1S19pTU10N0FBQUNtU1gtSnZvODg0LnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9Ijk4Ij48L3A+
- 答案：QQ==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.
A、B两个正方体，它们的边长之比为2：1，密度之比为4：5，先将B放在水平桌面上，再将A叠放在B的上面，A、B均处于静止状态. 则A对B的压强与B对桌面的压强之比pA：pB为（ ）
| A: 128:37 |
| B: 37:128 |
| C: 37:32 |
| D: 32:37 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 提示2：PHA+PGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0ZELzVFL3JCQUNGRk1KNUxMekJlX1RBQUFEOVh0QjRrSTE5OS5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvRkQvNUUvckJBQ0ZGTUo1TEx6QmVfVEFBQUQ5WHRCNGtJMTk5LnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjE3MiI+PC9wPg==
- 提示3：PHA+PGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzIwLzQ4L3JCQUNFMU1KNUxMaTh2b1VBQUFDd1hkQXQ2UTcxNS5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjAvNDgvckJBQ0UxTUo1TExpOHZvVUFBQUN3WGRBdDZRNzE1LnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjEwNyI+PC9wPg==
- 答案：RA==
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
本课配套习题挑战模式4/5
单选题
难度系数：
4.如图所示，质地均匀的实心圆柱体A、B叠放在水平地面上，已知他们的密度之比ρA：ρB=1：3，底面积之比SA：SB=4：3，A对B的压强和B对地面的压强之比PA：PB=1：2，则他们的高度之比hA：hB为（ ）
| A: 9:4 |
| B: 3:2 |
| C: 3:1 |
| D: 9:2 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 提示2：IOiLpUHjgIFC5YiG5Yir5pS+5Zyo5rC05bmz5Zyw6Z2i5LiK77yM5qC55o2uPGltZyB3aWR0aD02NiBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yMC80OC9yQkFDRTFNSjVMYlF4MjBSQUFBQjZrY0RVTmMwMDEucG5nIj7vvIzlj6/lvpc8aW1nIHdpZHRoPTQyIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0ZELzVFL3JCQUNGRk1KNUxhaVlldFBBQUFDQWpvRlhJVTQwNS5wbmciPg==
- 提示3：IOagueaNrjxpbWcgd2lkdGg9NTUgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMjAvNDgvckJBQ0UxTUo1TGJoRktJUkFBQUJzeW9aUmlFMjg3LnBuZyI+77yM5YiZPGltZyB3aWR0aD00MiBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9GRC81RS9yQkFDRkZNSjVMYWljbnAzQUFBQi0yTE5FTEkwNzkucG5nIj4=
- 答案：QQ==
PGRpdj48aW1nIHdpZHRoPTQ2IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzIwLzQ4L3JCQUNFMU1KNUxiUzBnbmhBQUFDQXpnTjNqVTk3OS5wbmciPu+8jDxpbWcgd2lkdGg9NjYgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjAvNDgvckJBQ0UxTUo1TGJBTWtBVkFBQUNQVW4yVDlFMzQ5LnBuZyI+77yMPGltZyB3aWR0aD04OCBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC9GRC81RS9yQkFDRkZNSjVMYWdPZGRUQUFBQ1dXNTZBU0EzODEucG5nIj7vvIzliJk8aW1nIHdpZHRoPTM3IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0ZELzVFL3JCQUNGRk1KNUxheXFBQ1dBQUFCc0NmeGtRRTEwOC5wbmciPu+8m+iLpUHjgIFC5YiG5Yir5pS+5Zyo5rC05bmz5Zyw6Z2i5LiK77yM5qC55o2uPGltZyB3aWR0aD01OCBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yMC80OC9yQkFDRTFNSjVMYUNNemRVQUFBQnVuS21YVEUwMzUucG5nIj7vvIzlj6/lvpc8aW1nIHdpZHRoPTM2IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzIwLzQ4L3JCQUNFMU1KNUxhU3FQLWRBQUFCN2tRZHNVVTgyNy5wbmciPu+8m+agueaNrjxpbWcgd2lkdGg9NDggaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvRkQvNUUvckJBQ0ZGTUo1TGJSelJ0NUFBQUJvbDVBNHBBNjcxLnBuZyI+77yM5YiZPGltZyB3aWR0aD0zNyBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9GRC81RS9yQkFDRkZNSjVMYmd6YUROQUFBQjhTczltck02NjQucG5nIj7jgILmiYDku6XpgInmi6lB6YCJ6aG544CCPC9kaXY+
本课配套习题挑战模式5/5
单选题
难度系数：
5.
两个正方体金属块A、B密度ρA：ρB为27：16，边长LA：LB=2：3，按如图叠放在水平地面上，金属块A对金属块B压强为P１，金属块B对地面压强为P２，则P1：P2=（ ）
| A: 3:4 |
| B: 20:27 |
| C: 27:20 |
| D: 9:4 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5q2j5pa55L2T6YeR5bGe5Z2XQeOAgULlr4bluqbPgTxzdWI+QTwvc3ViPu+8ms+BPHN1Yj5CPC9zdWI+5Li6MjfvvJoxNu+8jOi+uemVv0w8c3ViPkE8L3N1Yj7vvJpMPHN1Yj5CPC9zdWI+PTLvvJoz77yM5YiZ5qC55o2u6LSo6YeP772N77ydz4HCt++8tu+8jOW+l++9jTxzdWI+77yhPC9zdWI+77ya772NPHN1Yj7vvKI8L3N1Yj7vvJ0xOjLvvIzljbPph43lipvmr5RHPHN1Yj5BPC9zdWI+77yaRzxzdWI+Qjwvc3ViPj0xOjI8L3A+
- 提示2：PHA+6YeR5bGe5Z2X77yh5a+56YeR5bGe5Z2X77yi55qE5o6l6Kem6Z2i56ev77yzPHN1Yj7vvJE8L3N1Yj7kuI7ph5HlsZ7lnZfvvKLkuI7lnLDpnaLmjqXop6bpnaLnp6/vvLM8c3ViPu+8kjwvc3ViPueahOavlOS4uu+8lDrvvJk8L3A+
- 提示3：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
- 答案：QQ==
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
