3 |
4 |
E |
B |
3 |
4 |
vy |
vz |
| ||
v |
3 |
4 |
3mv |
4qE |
3m |
4qB |
1.6mv合 |
qB |
1.6mv |
qBcosθ |
2mv |
qB |
2m |
qB |
5m |
4qB |
t2 |
t1 |
5 |
3 |
(mg)2+(qE)2 |
| ||
qB |
E |
B |
5 |
3 |
| ||
qB |
1 |
4 |
A.等于
| B.大于
| ||||
C.小于
| D.与小车的速度v无关 |
A.小球向右摆到M点,然后就摆回来 |
B.小球向右摆到M和N之间圆弧上某点处,然后竖直下落 |
C.小球沿圆弧摆到N点,然后竖直下落 |
D.以上说法都不对 |
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