Expert: Richard J. Raridon - 9/2/2008

Question
please help me
i need answers to 4 questions.

1)
S=wd/h(h-d/2)
make h the subject

2)
I=E/root of(R^2+w^2l^2)
make R the subject

3)
L=WH/a(W+P)
make W the subject

4)H=w^2/2g(R^2-r^2)
make r the subject


pls reply fast thank you  

Answer
1) Sh/(wd) = h-d/2
Sh/(wd)-h = -d/2
h = (-d/2)/[S/(wd) -1]
2) (R^2+w^2l^2)^1/2 = E/l
R^2+w^2l^2 = (E/l)^2
R = [(E/l)^2-w^2l^2]^1/2
3) La = WH(W+P) = W^2H+WHP
W^2H+WHP-La = 0
W = [-HP +/-(H^2P^2+4HLa)^1/2]/(2H)
4) 2Hg/w^2 = R^2-r^2
r = [R^2-2Hg/w^2]^1/2