2012-2013
.
g=10N/kg =1.0 103kg/m3
3 24
1
A 100
B 1N X Kb 1. C o m
C 6103N
D 1.2m
2
A
B
C
D
3
A B
C D
4
A
B
C
D
5 100N 150N
A B C D
6
F
h
7
1 FA G
2 FB G
AFA
G B FBG C FA
=2G D FB=2G
8
A B C D
10 1 20
9
10
