3 |
| ||
tan300 |
| ||
4 |
m
| ||
R1 |
qB0R1 |
m |
| ||
4m |
m
| ||
R2 |
B0 |
2 |
| ||
8 |
| ||
2 |
2πm |
qB0 |
θ |
2π |
πm |
3 |
2πm |
qB1 |
4πm |
3qB0 |
θ′ |
2π |
10πm |
3qB0 |
3 |
4 |
3+
| ||
4 |
L |
v0 |
(1+
| ||
qB0 |
R |
2v0 |
| ||
3qB0 |
24πm+12m+14
| ||
3qB0 |
| ||
4m |
B0 |
2 |
| ||
2 |
24πm+12m+14
| ||
3qB0 |
A.若拉力突然消失,小球将沿轨迹Ba做离心运动 |
B.若拉力突然变小,小球将沿轨迹Ba做离心运动 |
C.若拉力突然变大,小球将沿轨迹Bb做离心运动 |
D.若拉力突然变小,小球将沿轨迹Bb做离心运动 |
A.螺丝帽受的重力与最大静摩擦力平衡 | ||||
B.螺丝帽受到杆的弹力方向水平向外,背离圆心 | ||||
C.此时手转动塑料管的角速度ω=
| ||||
D.若杆的转动加快,螺丝帽有可能相对杆发生运动 |
A.小球仍作逆时针匀速圆周运动,半径不变 |
B.小球仍作逆时针匀速圆周运动,但半径减小 |
C.小球作顺时针匀速圆周运动,半径不变 |
D.小球作顺时针匀速圆周运动,半径减小 |
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