deel
Popular questions and responses by deel
math
Please help me to find an equation for the tangent to the curve xsin2y=ycos2x at the point (phi/4, phi/2)
asked on August 13, 2012 
math
A tank contains 50 gallons of a solution composed of 90% water and 10% alcohol. A second solution containing 50% water and 50% alcohol is added to the tank at rate of 4 gallons per minute. As the second solution is being added, the tank is being drained at
asked on August 10, 2012 
linear algebra
in order to grow a certain crop, it is recommended that each square foot of ground be treated with 10 units of phosphorous, 9 units of potassium, and 19 units of nitrogen, suppose that there are three brands of fertilizer on the market  say brand X, brand
asked on November 11, 2012 
math
In a room of 20.000 ft^3 of air, 600 ft^3 of fresh air flows in per minute, and the mixture (made practically inform by circulating fans) is exhausted at a rate of 600 cubic feet per minute (cfm). What is the amount of fresh air inside the room y(t) at any
asked on August 8, 2012 
math
The stiffness S of a rectangular beam is proportional to its width (w) times the cube of its depth/height (h). find the dimensions (i.e.: w and h) of stiffest beam that can be cut from a log which has a circular crosssection with diameter of 12in.
asked on August 9, 2012 
math
please help me how to solve the integral sinx/x dx from 0 to infinite : ∫_0^∞▒〖sinx/x dx〗 thank you
asked on March 24, 2013 
math
please help me to solve this assignment : consider a 2D mirror has a parabolic profile of y = (x3)^2 + 5 facing toward y^+ direction. Prove that any beam of light in y^ direction that this hits the mirror will be reflected toward a particular point (i.e.
asked on September 18, 2012 
math
consider a 2D mirror has a parabolic profile of y = (x3)^2 + 5 facing toward y^+ direction. Prove that any beam of light in y^ direction that this hits the mirror will be reflected toward a particular point (i.e. known as the focus of parabolic mirror.
asked on September 17, 2012 
math
find the derivatives, dy/dx for the folowing function : y=ln(cos(0.5)+(sin(x^2+3))^1/3)
asked on August 25, 2012 
math
how to find the following limit : lim lnx/lgx x>infinity
asked on August 21, 2012 
math
find the derivatives, dy/dx, for the following functions : y=(1+sin^2{2 exp (3x)})^5y please help me to solve this assignment. thank's
asked on August 20, 2012 
math
A right circular cylinder of radius r and height h is inscribed in a right circular cone of radius R and height H, as shown on the right figure. Find the value of r (in terms of R and H) that maximizes the total surface area of the cylinder (including top
asked on August 11, 2012

math
thank's steve :)
posted on August 21, 2012 
math
yes i'm sure..the assignment like that.
posted on August 20, 2012 
math
thanks for your help :)
posted on August 11, 2012 
math
y(t)=amount of alcohol in the tank at time t dy/dt =y’(t) = alcohol inflow rate – alcohol outflow rate = 4  5(y/50) =200  5y/50 = 5 (40y)/50 dy/dt = 5 (40y)/50 Separate variable and integrate : dy/(40y) = 5/50dt ln(40y) = 0.1t + C ln(40y)
posted on August 11, 2012 
math
oke thanks, i'ill try it
posted on August 11, 2012 
math
thanks for your help
posted on August 10, 2012 
math
yes i understand now, thanks for your help
posted on August 9, 2012 
math
thanks for your help
posted on August 9, 2012 
math
h^3=s/kw h^3=s/k(12h) sorry, I'm still confused how to get the function of h. please help me to complete the assignment. thank you
posted on August 9, 2012