R-h |
R |
G |
F1 |
R-h |
R |
GR |
R-h |
GR |
R-h |
| ||
R |
G
| ||
R-h |
GR |
R-h |
R-h |
R |
G
| ||
R-h |
A.杆对小环的作用力大于m1g+m2g |
B.m1不变,则m2越大,β越小 |
C.θ=β,与m1、m2无 |
D.若杆不光滑,β可能大于θ |
A.FN1>FN2>FN3,Ff1>Ff2>Ff3 |
B.FN1=FN2=FN3,Ff1=Ff2=Ff3 |
C.FN1>FN2>FN3,Ff1=Ff3<Ff2 |
D.FN1>FN2>FN3,Ff1=Ff2=Ff3 |
A.①③ | B.③④ | C.①④ | D.②④ |
| ||
3 |
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