1 |
2 |
|
v2 |
r |
qB2r2 |
2m |
qB2R2 |
2m |
3 |
qBr |
m |
R | ||
|
2
| ||
3qB |
| ||||
v |
πm |
3qB |
R |
v |
| ||
3qB |
(3
| ||
3qB |
qB2R2 |
2m |
(3
| ||
3qB |
|
A.小球到达P点时的速度等于
| ||||
B.小球不能到达P点 | ||||
C.小球能到达P点,且在P点受到轻杆向上的弹力 | ||||
D.小球能到达P点,受到轻杆的作用力为零 |
A.T1:T2=1:cosθ | B.T1:T2=1:sinθ |
C.FA:FB=cos2θ:1 | D.FA:FB=1:cos2θ |
A.做匀变速运动 | B.所受合外力为零 |
C.加速度大小恒定 | D.做变加速运动 |
© 2017-2019 超级试练试题库,All Rights Reserved.