*해설

<문제 해설>
r1=S1 x rw , r2=S2 x rw rw=9800 물의 비중량
PA=r2xh2-r1xh1 , h1^=(h1+L) , h2^=(h2+2L)
PA + 40kPa + r1h1^=r2h2^
r2xh2-r1xh1 + 40kPa + r1(h1+L) = r2(h2+2L)
40kPA + r1 x L = 2*r2*L
L= 40000/(2*r2-r1) = 40000/(9800*(2*13.6-1.5)) = 0.1588
ANS h2^=0.2+0.1588*2 = 0.518