工程力学习题全解第章动量矩定理习题解.pdf
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20-1 O ab O c
1.m R ω
O
2.m l ω O
O
3.m R m/2
vO
1 2
1L J ω mR ω
O O O O
2
2 1 2
L J ω ml ω
O O O O
3 20-1
1 2 υO m 3R 7R vO 37
3 L mR ⋅ + ⋅ ⋅ ⋅ mRυ
O O
2 R 2 4 4 R 32
20-2 m1m2
r1 r2
1L m r ω⋅r +m r ω⋅r
O 1 1 1 2 2 2
M m gr +m gr α
O 1 1 2 2
F
ON
d LO M O dω α
d t d t
( 2 2 ) ( ) FOx
m r +m r α m r −m r g
1 1 2 2 1 1 2 2
T ′
m r −m r ω T ′ 2
1 1 2 2 1
α g
m r 2 +m r 2 T
1 1 2 2 1
m r −m r 0
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