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VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Mathematical Methods CAS => Topic started by: chuckjefster90 on September 24, 2009, 08:44:28 pm

Title: Diffierentiation
Post by: chuckjefster90 on September 24, 2009, 08:44:28 pm

need helps on this question

Water draining from a cone shaped funnel at a rate of 500 cm3/min. The cone has a base radius of 20cm and a height of 100cm. let h cm be the depth of the water in the funnel at t minutes. The rate of decrease of h in cm/min is given by?

Title: Re: Diffierentiation
Post by: m@tty on September 24, 2009, 08:51:45 pm

What is the answer?

Title: Re: Diffierentiation
Post by: Flaming_Arrow on September 24, 2009, 08:54:18 pm

you have to use similar triangles

r/h = 20/100

r = h/5

sub that into V= 1/3 pi r^2h

Title: Re: Diffierentiation
Post by: chuckjefster90 on September 24, 2009, 10:40:38 pm

Thanks Cheers