3 |
4 |
3mg |
4 |
8R |
3 |
1 |
2 |
v | 2A |
| ||
2 |
| ||
R |
17mg |
4 |
qB
| ||
2 |
3 |
4 |
4R |
4μ+3 |
4μmgR |
4μ+3 |
3 |
4 |
8R |
3 |
17mg |
4 |
qB
| ||
2 |
4μmgR |
4μ+3 |
A.②③ | B.①② | C.①④ | D.③④ |
A.小球在MN的左方加速度为
| ||
B.F2的方向向右 | ||
C.小球在M右方运动的时间为t3-t1 | ||
D.小球在t=0到t=t4这段时间内的最大位移为v1(t4-t2),小球最终能回到A点 |
A.(1)(2) | B.(3)(4) | C.(2)(4) | D.(2)(3) |
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