A.①④⑤正确 | B.③⑤⑥正确 | C.②④⑤正确 | D.③④⑥正确 |
v | 0 |
| ||
3 |
1 |
2 |
mv | 20 |
1 |
2 |
)v | 2 |
mv | 20 |
v | 1 |
v | 2 |
v | 0 |
v | 1 |
mv | 2 |
v | 1 |
+v | 2 |
=v | 0 |
L |
2 |
1 |
2 |
mv | 20 |
1 |
2 |
mv | 21 |
1 |
2 |
mv | 22 |
v | 3 |
v | 1 |
mv | 2 |
v | 3 |
v | 1 |
+v | 2 |
2v | 3 |
v | 3 |
| ||
2 |
L |
2 |
1 |
2 |
v | 20 |
1 |
2 |
mv | 22 |
1 |
2 |
)v | 23 |
L |
2 |
| ||
4 |
1 |
2 |
mv | 22 |
fL |
4 |
1 |
2 |
mv | 22 |
L |
4 |
S | 相对 |
| 1 |
L |
2 |
| 2 |
L |
4 |
t | 1 |
>t | 2 |
A.手对重物做的功W1=
| ||||
B.重物从静止下落到速度最大过程中重物克服弹簧所做的功为W2=
| ||||
C.弹性势能最大时小球加速度大小为g | ||||
D.最大的弹性势能为
|
© 2017-2019 超级试练试题库,All Rights Reserved.