0 U 1-22+y)b1et 6δ 0=6(2n-7)(-2n+m2)d 0 =6(-n2+473-572+2n)dn δa2 15 15 uu d(u/0) 2uL 0=0(y/6)0 6
11 2 2 2 2 0 2 2 ( )(1 ) y y y y dy = − − + y let ＝ 1 2 2 0 = − − + (2 )(1 2 )d 0 (1 ) u u dy U U = − 2 2 u y y 2 U = − = − + − + 1 0 4 3 2 ( 4 5 2)d 15 2 = 15 2 = U x w 2 =0 ( ) = w = y y u 0 ( / ) ( / ) = = y y U u U
de 2 I(x)= 6 2 ds d6154( 15 dx dxpUδ(p 15v 6≈5.5 The thickness of a flat plate BL v=1.5×1035m2/sU=40m/sx=1 Estimate S 61 6≈3.4mm x300 12
12 1 15 2 2 x U = 2 w d U dx = U x w 2 ( ) = 15 2 = U x 5.5 The thickness of a flat plate BL: 3.4mm 1.5 10 m /s −5 2 = U = 40m/s x =1m Estimate dx d U U 15 2 2 2 = 300 1 x dx U d 15 = =