A.mgcosθ,mgcos(45°-
| B.mgsinθ,2mgsin(45°-
| ||||
C.mgsinθ,mgcosθ | D.mgcosθ,2mgcos(45°-
|
θ |
2 |
θ |
2 |
θ |
2 |
A.Fcosθ | B.Fsinθ | C.μ(Fsinθ-mg) | D.μ(mg-Fsinθ) |
A.若杆光滑则θ=β |
B.若杆光滑,杆对小环的作用力大小小于(m1+m2)gcosθ |
C.若杆不光滑,则θ>β |
D.若杆不光滑,杆对小环的作用力大小大于(m1+m2)gcosθ |
A.ma | B.F2 | C.F1-F2 | D.F2+ma |
A.0.1 Kg | B.3 Kg | C.9 Kg | D.15 Kg |
A.若m>M,有x1=x2 | B.若m<M,有x1=x2 |
C.若µ>sinθ,有a1=a2 | D.若µ<sinθ,有a1=a2 |
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