d |
2 |
| ||
3 |
| ||
3 |
1 |
2 |
1 |
2 |
3 |
|
| ||
3v0 |
d |
3 |
| ||
2v0 |
| ||
6v0 |
T |
3 |
2πr |
6v0 |
πd |
9v0 |
| ||
2 |
π |
9 |
d |
v0 |
3r |
2 |
d |
3 |
3 |
2 |
d2 |
6 |
| ||
2 |
π |
9 |
d |
v0 |
d2 |
6 |
A.一定作匀变速运动 | B.速度大小可能不变 |
C.速度方向一定不变 | D.速度一定增大 |
A.E1=E2=E3 | B.E1>E2=E3 | C.E1<E2=E3 | D.E1>E2>E3 |
A.增大U1 | B.减小U1 | C.增大U2 | D.减小U2 |
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