|
1 |
2 |
v | 20 |
|
1 |
2 |
v | 20 |
1 |
2 |
v | 21 |
1 |
2 |
v | 22 |
1 |
2 |
|
1 |
2 |
|
1 |
2 |
qE |
m |
2v1 |
a |
1 |
2 |
|
6π2qE |
S |
1 |
2 |
|
|
|
6π2qE |
S |
1 |
2 |
A.W+mgh1-mgh2 | B.mgh2-mgh1-W |
C.mgh1+mgh2-W | D.W+mgh2-mgh1 |
A.物体动能损失了
| B.物体动能损失了2mgh | ||
C.系统机械能损失了2mgh | D.系统机械能损失了
|
| ||
4gs |
A.重力做的功为
| ||
B.重力的最大瞬时功率为mg
| ||
C.重力的冲量为0 | ||
D.重力的冲量大小为mv-mv0 |
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