A.
| B.
| C.
| D.以上均错 |
cosα |
cosβ |
A.vA
| B.vA
| C.vA
| D.vA
|
A.1200N | B.1300N | C.2400N | D.2600N |
A.绳子的拉力不断增大 | B.绳子的拉力不变 |
C.船所受浮力增大 | D.船所受浮力不变 |
A.1m/s | B.3m/s | C.8m/s | D.10m/s |
A.F1=7N,F2=8N,F3=9N | B.F1=8N,F2=2N,F3=11N |
C.F1=7N,F2=1N,F3=5N | D.F1=10N,F2=8N,F3=1N |
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