| ||
4gs |
1 |
2 |
v02 |
2gs |
1 |
2 |
1 |
2 |
1 |
2 |
| ||
18gs |
| ||
18gs |
| ||
2gs |
| ||
4gs |
1 |
2 |
1 |
2 |
| ||
2 |
| ||
4 |
1 |
2 |
1 |
2 |
mv02 |
8 |
1 |
2 |
1 |
4 |
1 |
4 |
7 |
4 |
mv02 |
8 |
7s |
4 |
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 |
A.小车克服重力所做的功是mgh | ||
B.合外力对小车做的功是
| ||
C.推力对小车做的功是
| ||
D.阻力对小车做的功是
|
A.μmgs | B.2μmgs | C.3μmgs | D.4μmgs |
A.Ek1>Ek2 W1<W2 | B.Ek1>Ek2 W1=W2 |
C.Ek1=Ek2 W1>W2 | D.Ek1<Ek2 W1>W2 |
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