1 |
4 |
mg |
2E |
mgL |
2q |
1 |
2 |
v | 2B |
| ||
L |
1 |
2 |
v | 2C |
3gL |
qU |
L |
L |
vC |
1 |
2 |
1 |
4 |
1 |
2 |
qU1 |
L |
2mgL |
q |
qU2 |
L |
4mgL |
q |
3gL |
mgL |
2q |
1 |
4 |
A.m、x一定时,R越大,△F一定越大 |
B.m、x、R一定时,v越大,△F一定越大 |
C.m、R一定时,x越大,△F一定越大 |
D.m、R、x一定时,△F与v的大小无关 |
A.仍为5m/s | B.小于5m/s | C.大于5m/s | D.无法判断 |
A.0.5mgR | B.mgR | C.2mgR | D.3mgR |
© 2017-2019 超级试练试题库,All Rights Reserved.