E |
R |
B2L2v |
R |
mgRsinθ |
B2L2 |
mgRsinθ |
B2L2 |
1 |
2 |
Q |
mgsinθ |
m2R2gsinθ |
2B4L4 |
. |
E |
△φ |
△t |
. |
I |
| ||
R |
. |
I |
△φ |
R |
BLx |
R |
BLQ |
mgRsinθ |
m2Rgsinθ |
2B3L3 |
Q |
mgsinθ |
m2R2gsinθ |
2B4L4 |
BLQ |
mgRsinθ |
m2Rgsinθ |
2B3L3 |
2mg |
k |
A.烧断细绳的瞬间,小球的加速度a=
| ||
B.烧断细绳的瞬间,小球的加速度a=gsinθ | ||
C.弹簧在C处与小球断开的瞬间,小球的加速度a=
| ||
D.弹簧在C处与小球断开的瞬间,小球的加速度a=gsinθ |
A.480m,11250N | B.960m,22500N |
C.480m,22500N | D.960m,11250N |
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