1 |
4 |
1 |
2 |
v | 2B |
v2 |
R |
rcos30° |
L |
| ||
10 |
1 |
2 |
v | 20 |
2μgL |
10
|
1 |
2 |
v | 20 |
R |
μ |
20
| ||
3 |
A.Ek1<Ek2,W1=W2 | B.Ek1>Ek2,W1=W2 |
C.Ek1>Ek2,W1>W2 | D.Ek1<Ek2,W1<W2 |
A.若甲、乙两物体与水平面动摩擦因数相同,则甲的质量较大 |
B.若甲、乙两物体与水平面动摩擦因数相同,则乙的质量较大 |
C.若甲、乙两物体质量相等,则甲与地面间的动摩擦因数较大 |
D.若甲、乙两物体质量相等,则乙与地面的动摩擦因数较大 |
1 |
4 |
A.20J | B.24J | C.34J | D.54J |
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