1 |
4 |
X |
X |
1.6
| ||
m |
1.6
| ||
0.4 |
1 |
2 |
vB2 |
2S |
0.4×3.22 |
2×0.64 |
mVC |
M+m |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
VDX2VDY |
g |
0.32×2×1.1 |
10 |
A.摩擦力对工件做的功为
| ||
B.传送带克服摩擦力做的功为
| ||
C.电动机增加的电能等于传送带克服摩擦力做的功 | ||
D.电动机增加的电能等于物块增加的动能 |
A.mgH | B.mgH+mgH | C.
| D.
|
A.重力做功mgR | B.机械能减少mgR | ||
C.合外力做功mgR | D.克服摩擦力做功
|
A.2
| B.3
| C.10m/s | D.5m/s |
A.mgLcosθ | B.mgL(1-cosθ) | C.FLsinθ | D.FLcosθ |
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