配套习题- 力的正交分解法 -【青果学院】

1/4单选题

难度：

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

）（）

A
B
C
D

正确答案：QQ==

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

2/4单选题

难度：

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（）

A
B
C
D

正确答案：RA==

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

3/4单选题

难度：

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（　　）

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

正确答案：RA==

5Lul5oKs5oyC54K55Li656CU56m25a+56LGh77yM55S75Ye65Y+X5Yqb5Zu+5aaC5Zu+5omA56S6LiDnlLHkuo7kuKTkvqfnu7PlrZDnmoTmi4nlipvlpKflsI/nm7jnrYnvvIzlj6/ku6Xmjqjnn6XkuKTkvqfnu7PlrZDkuI7nq5bnm7TmlrnlkJHnmoTlpLnop5I8aW1nIHdpZHRoPTE0IGhlaWdodD0xOSBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzVCL0IzL3JCQUNGRk9UTTI2aEFKSkdBQUFCSmp4LXA1UTk5Mi5wbmciPuebuOetiS4g55Sx5bmz6KGh5p2h5Lu25b6XPGltZyB3aWR0aD0xMjAgaGVpZ2h0PTk4IHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNUIvQjMvckJBQ0ZGT1RNMjZqem5MckFBQUtTRXVBMTZVOTAuanBlZyIgYWxpZ249bGVmdCBoc3BhY2U9MTIgIHNyYz0iaXRlbS5maWxlcy9pbWFnZTAyMS5wbmciPuiuvue7s+mVv+S4ujxpbWcgd2lkdGg9MTQgaGVpZ2h0PTE3IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNUIvQjIvckJBQ0ZGT1RNMmZTczdSUEFBQUJFaldwMFNFODQ2LnBuZyI+77yM5bem44CB5Y+z5Lik5L6n57uz6ZW/5Li6PGltZyB3aWR0aD00MSBoZWlnaHQ9MjMgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC85Ny9CRi9yQkFDRTFPVE0yN2owMExrQUFBQnBCdGx1VUk2OTgucG5nIj7vvIzkuKTmnYbkuYvpl7TnmoTlrr3luqbkuLo8aW1nIHdpZHRoPTE0IGhlaWdodD0xOSBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzk3L0JGL3JCQUNFMU9UTTJleFBJbFhBQUFCUUJqUk9WZzkyNS5wbmciPu+8jOaJgOS7pTxpbWcgd2lkdGg9MTIyIGhlaWdodD0yMyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzVCL0IzL3JCQUNGRk9UTTI2eXl4dEFBQUFDN21Yc0VlTTI1Mi5wbmciPu+8jOWImTxpbWcgd2lkdGg9MTEyIGhlaWdodD00MSBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzk3L0JGL3JCQUNFMU9UTTItaFM0d2hBQUFEUEVjTVJ3RTEzNS5wbmciPueUseatpOWPr+ingTxpbWcgd2lkdGg9MTQgaGVpZ2h0PTE5IHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNUIvQjMvckJBQ0ZGT1RNMjZoQUpKR0FBQUJKangtcDVROTkyLnBuZyI+5Y+q55SxPGltZyB3aWR0aD0zNiBoZWlnaHQ9MTkgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC81Qi9CMy9yQkFDRkZPVE0yN2lpLThuQUFBQmtpUktGNjgyNTAucG5nIj7lhrPlrprvvIzkuI7lhbbku5blm6DntKDml6DlhbPvvIw8aW1nIHdpZHRoPTE3IGhlaWdodD0xNyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzVCL0IzL3JCQUNGRk9UTTI2ZzZreEpBQUFCTGsybzZoMDQ3NS5wbmciPueahOWkp+Wwj+S4jue7s+WtkOWcqDxpbWcgd2lkdGg9NDMgaGVpZ2h0PTIzIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvOTcvQkYvckJBQ0UxT1RNMjdCYlZraEFBQUJ0R2xwZU5BMzI0LnBuZyI+55qE5L2N572u5peg5YWz77yM5omA5LulQeOAgULkuKTpobnlnYfmraPnoa4uIOWwhuadhuenu+WKqOWIsOiZmue6v+S9jee9ruaXtu+8jDxpbWcgd2lkdGg9MTQgaGVpZ2h0PTE5IHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvOTcvQkYvckJBQ0UxT1RNMmV4UElsWEFBQUJRQmpST1ZnOTI1LnBuZyI+5Y+Y5bCP77yMPGltZyB3aWR0aD0xNCBoZWlnaHQ9MTkgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC81Qi9CMy9yQkFDRkZPVE0yNmhBSkpHQUFBQkpqeC1wNVE5OTIucG5nIj7lj5jlsI/vvIznu7PlrZDlvKDlipvlj5jlsI/vvIzlj6/op4FE6aG55q2j56GuLiA=

4/4单选题

难度：

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.

A	1m
B	2m
C	3m
D	4m

正确答案：QQ==

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