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#1 sarmad

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Posted 18 April 2006 - 11:04 AM

hi tried doing this question, firstly i differentiated the equation to 0 after multiplying out the brackets and i got w= 11.5 after that i dont have a clue what to do, can anyone help me please!

#2 duncad

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Posted 18 April 2006 - 01:10 PM

S = 1.7w(400-w power2.gif )
S = 680w - 1.7w power3.gif
dS/dw = 680 - 5.1w power2.gif = 0 at SP
w power2.gif = 400/3
w = sqrt.gif (400/3)
w = sqrt.gif (400 * 1/3)
w = 20 sqrt.gif (1/3) (surds)

By Pythagoras

d power2.gif = 20 power2.gif - w power2.gif
d power2.gif = 400 - 400/3
d = sqrt.gif (400 - 400/3)
d = sqrt.gif (400*2/3
d = 20 sqrt.gif (2/3)





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