CHAPTER5
j
,
, PROBLEMj5.1
Locatejthejcentroidjofjthejplanejareajshown.
SOLUTION
Areaj1:j Rectanglej72jmmjbyj45jmm.
Areaj2:j Trianglejbj=j27jmm,jhj=j45jmm.
A,jmm2 xj,jmm yj,jmm xjA,jmm3 yjA,jmm3
1 3240 36 22.5 116,640 72,900
2 -607.5 9 215 -5467.5 -9112.5
2632.5 11,172.5 63,787.5
Xj(2632.5jmm2j)j=j11,172.5jmm3
Yj(2632.5jmm2j)j=j63787.5jmm3
Copyrightj©jMcGraw-HilljEducation.jPermissionjrequiredjforjreproductionjorjdisplay.
, PROBLEMj5.2
Locatejthejcentroidjofjthejplanejareajshown.
SOLUTION
A,jin2 xj,jin. yj,jin. xjA,in3 yjA,in3
1 8 0.5 4 4 32
2 3 2.5 2.5 7.5 7.5
11 11.5 39.5
Xj(11jin2j)j=j11.5jin3
Yj(11jin2j)j=j39.5jin3
Copyrightj©jMcGraw-HilljEducation.jPermissionjrequiredjforjreproductionjorjdisplay.
j
,
, PROBLEMj5.1
Locatejthejcentroidjofjthejplanejareajshown.
SOLUTION
Areaj1:j Rectanglej72jmmjbyj45jmm.
Areaj2:j Trianglejbj=j27jmm,jhj=j45jmm.
A,jmm2 xj,jmm yj,jmm xjA,jmm3 yjA,jmm3
1 3240 36 22.5 116,640 72,900
2 -607.5 9 215 -5467.5 -9112.5
2632.5 11,172.5 63,787.5
Xj(2632.5jmm2j)j=j11,172.5jmm3
Yj(2632.5jmm2j)j=j63787.5jmm3
Copyrightj©jMcGraw-HilljEducation.jPermissionjrequiredjforjreproductionjorjdisplay.
, PROBLEMj5.2
Locatejthejcentroidjofjthejplanejareajshown.
SOLUTION
A,jin2 xj,jin. yj,jin. xjA,in3 yjA,in3
1 8 0.5 4 4 32
2 3 2.5 2.5 7.5 7.5
11 11.5 39.5
Xj(11jin2j)j=j11.5jin3
Yj(11jin2j)j=j39.5jin3
Copyrightj©jMcGraw-HilljEducation.jPermissionjrequiredjforjreproductionjorjdisplay.