中学生网络课堂本课配套习题挑战模式1/4
单选题
难度系数：
1.用一根长
的轻质细绳将一副质量为
的画框对称悬挂在墙壁上，已知绳能承受的最大张力为
，为使绳不断裂，画框上两个挂钉的间距最大为（
取
）（ ）
的轻质细绳将一副质量为的画框对称悬挂在墙壁上，已知绳能承受的最大张力为，为使绳不断裂，画框上两个挂钉的间距最大为（取）（ ） A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 答案：QQ==
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
本课配套习题挑战模式2/4
单选题
难度系数：
2.轻绳总长
，用轻滑轮悬挂重
的物体. 绳能承受的最大拉力是
，将一端固定，将另一端缓慢向右移动
而使绳不断，则的最大可能值为（ ） 
，用轻滑轮悬挂重的物体. 绳能承受的最大拉力是，将一端固定，将另一端缓慢向右移动而使绳不断，则的最大可能值为（ ） A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 答案：RA==
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
本课配套习题挑战模式3/4
单选题
难度系数：
3.如图所示，晾晒衣服的绳子轻且光滑，悬挂衣服的衣架的挂钩也是光滑的，轻绳两端分别固定在两根竖直杆上的
两点，衣服处于静止状态，如果保持绳子
端位置不变，将
端分别移动到不同的位置，下列判断正确的是（ ）
两点，衣服处于静止状态，如果保持绳子端位置不变，将端分别移动到不同的位置，下列判断正确的是（ ） A:端移到 位置时，绳子张力不变 |
B:端移到 位置时，绳子张力不变 |
| C:端在杆上位置不动，将杆移动到虚线位置时，绳子张力变大 |
| D:端在杆上位置不动，将杆移动到虚线位置时，绳子张力变小 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOeUseS6juS4pOS+p+e7s+WtkOeahOaLieWKm+Wkp+Wwj+ebuOetie+8jOWPr+S7peaOqOefpeS4pOS+p+e7s+WtkOS4juerluebtOaWueWQkeeahOWkueinkjxpbWcgd2lkdGg9MTQgaGVpZ2h0PTE5IHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNUIvQjMvckJBQ0ZGT1RNMjZoQUpKR0FBQUJKangtcDVROTkyLnBuZyI+55u4562JLiDnlLHlubPooaHmnaHku7blvpc8aW1nIHdpZHRoPTExMiBoZWlnaHQ9MjMgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC85Ny9CRi9yQkFDRTFPVE0yNkNGaGZtQUFBREpRa0xJUVk1OTYucG5nIj4=
- 提示2：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
- 答案：RA==
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
本课配套习题挑战模式4/4
单选题
难度系数：
4.
的画（含画框），已知画框背面有两个相距
、位置固定的挂钩. 现将轻质细绳的两端分别固定在两个挂钩上，把画对称地挂在插入竖直墙壁的光滑钉子上，挂好后整条细绳呈绷紧状态. 若细绳能够承受的最大拉力为
，取，要使细绳不被拉断，求细绳的最小长度.
的画（含画框），已知画框背面有两个相距、位置固定的挂钩. 现将轻质细绳的两端分别固定在两个挂钩上，把画对称地挂在插入竖直墙壁的光滑钉子上，挂好后整条细绳呈绷紧状态. 若细绳能够承受的最大拉力为，取，要使细绳不被拉断，求细绳的最小长度. | A: 1m |
| B: 2m |
| C: 3m |
| D: 4m |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 答案：QQ==
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
