3 |
2 |
3 |
4 |
4 |
9 |
1 |
2 |
x |
y |
vy |
vx |
at |
vx |
2 |
tanα |
4 |
3 |
2vx |
atanα |
2
| ||
atanα |
4
| ||
3a |
v2 |
R |
mv |
qB |
mvx |
qBcosβ |
5mvx |
3qB |
9 |
5 |
4qBv0 |
9 |
qE |
m |
4Bv0 |
9 |
3mvx |
qB |
x |
d |
4qBvx |
9ma |
4 |
9 |
x′ |
r |
4 |
5 |
127° |
360° |
127 |
360 |
2πm |
qB |
127πm |
180qB |
3π-2(α+β) |
2π |
[3π-2(α+β)]m |
qB |
3 |
2 |
4 |
3 |
127πm |
180qB |
[3π-2(α+β)]m |
qB |
3 |
2 |
4 |
3 |
4Bv0 |
9 |
4 |
9 |
127πm |
180qB |
[3π-2(α+β)]m |
qB |
3 |
2 |
4 |
3 |
q |
m |
3 |
1 |
2 |
A.B′点在B点的右侧 |
B.从B′点射出的速度大于从B点射出的速度 |
C.从B′点射出的速度方向平行于从B点射出的速度方向 |
D.D从A到B′的时间小于从A到B的时间 |
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