Optimization Definition and 588 Threads

Homework Statement Ok I know this question is really easy but for some reason I got it wrong. You are given a piece of sheet metal that is twice as long as it is wide and has an area of 800m^2. Find the dimensions of the rectangular box that would contain a maximum volume if it were...

Homework Statement a gothic window it to be built with 6 segments that total 6m in length. The window must fit inside an area that is 1m wide and 3 meters tall. the triangle on top must be equilateral. What is the maximum area of the window. Homework Equations The Attempt at a...

Hi, I am having a hard time with this Optimization question as i do not know where to begin, I drew a diagram but what formulas, function etc do I use to start the question? And How do i do it? Two towns A and B are 7km and 5km, respectively, from a railroad line. The points C and D nearest to...

Homework Statement A telephone company has to run a line from point A on one side of a river to another point B that is on the other side, 5km down from the point opposite A. The river is uniformly 12 km wide. The company can run the line along the shoreline to a point C and then under the...

Homework Statement The demand function for a product is modeled by p=56e^-0.000012x Where p is the price per unit (in dollars) and x is the number of units. What price will yield a maximum revenue. Homework Equations The Attempt at a Solution Ok so i tried taking the...

Homework Statement A real estate office manages 50 apartments in a downtown building. When the rent is $900 per month, all the units are occupied. For ever $25 increase in rent, one unit becomes vacant. On average, all units require $75 in maintenance and repairs each month. How much rent...

Homework Statement A cylindrical shaped tin can must have a volume of 1000cm3. Find the dimensions that require the minimum amount of tin for the can (Assume no waste material). The smallest can has a diameter of 6cm and a height of 4 cm. Homework Equations V = \pi r^{2}h P = 2(...

Homework Statement The illumination of an object by a light source is directly proportional to the strength of the source and inversely proportional to the square of the distance from the source. If two light sources, one three times as strong as the other, are placed 10 feet apart, where...

Homework Statement If the perimeter of a rectangle is fixed in length, show that the area of the rectangle is greatest when it is square Homework Equations The Attempt at a Solution if the perimeter is fixed in length, then 2x + 2y = c then no idea to continue from there

Homework Statement Find two points on curve y=x4-2x2-x that have a common tangent line. Homework Equations *the one stated above dy/dx = 4x3-4x-1 The Attempt at a Solution equation of a tangent line: y=mx+b (4x3-4x-1) = m at two different points? So there are two points for which...

Homework Statement A truck driving over a flat interstate at a constant rate of 50 mph gets 4 miles to the gallon. Fuel costs $0.89 per gallon. For each mile per hour increase in speed, the truck loses a tenth of a mile per gallon of its mileage. Drivers get $27.50 per hour in wages, and the...

Homework Statement there's a picture of the question... from my textbook http://photos-h.ak.fbcdn.net/hphotos..._1385551_n.jpg thers a diagram image of the problem too to help understand Homework Equations well its a word problem, i used cosine rule at beginining and then...

could someone please try and solve this? and explanation would be greatly appreciated too ! this was one of the homework questions, but i didnt really understand. the teacher explained it again to the class partly, but didnt understand a part of it so we didnt continue... maybe one of you guys...

Homework Statement Given the function y = 12- 3x^2, find the maximum semi-circular area bounded by the curve and the x-axis. Homework Equations A= Pi(r^2) The Attempt at a Solution I found my zeros, 2 and -2, and my maximum height of 12 from the y'. A' = 2Pi(r)

Dear Friends, Some one can help me to make sedumi function which can solve the semidefinite optimization. Additionally, how can I distinguish between Second order cone programming and semidefinite quadratic linear programming. Thank You.

Hi Im trying to write an equation for the question below. Could someone please point me in the right direction with writing it? Homework Statement An island is 4km from the nearest point p on the straight shoreline of a lake. if a person can row a boat at 3km/h and walk at 5km/h where...

I am trying to write something like: minimize {w \in \mathbb{C}^N} You can see it in the attached file. It is written in MathType. I want to do the same in LaTeX. One way (not so correct) is to use "min" instead of "minimize": \displaystyle \min_{w \in \mathbb{C}^N}

Homework Statement Here is the exact problem, in order to avoid confusion The Attempt at a Solution I know that I have to find an expression for "h" and substitute it back into the Volume, but the way I do it, it just becomes way too messy to find the derivative. Any ideas?

I'll try to be as abstract as possible, but where needed, I'll give some concrete examples. If you have any questions, please ask. Note, I'm doing this for my hobby, not for any sort of homework. I've only followed an introductory course on computational complexity, so I'll let that be my...

Homework Statement http://img7.imageshack.us/img7/1826/43544187.jpg Homework Equations The Attempt at a Solution whats wrong with my answers? everything looks right to me... :S

You are designing a rectangular poster to contain 50 cm2 of printing with margins of 4 cm each at the top and bottom and 2 cm at each side. What overall dimensions will minimize the amount of paper used? What i did was let the length and breath of the whole poster to be x and y so the area...

Homework Statement A woman at point A on the shore of a circular lake with radius 2 miles wants to arrive at point C diametrically opposite A on the shore of the lake in the shortest time possible. She can walk at 4 mph and row a boat at 2 mph. To what point on the shore of the lake should...

Homework Statement a) Show that of all the rectangles with a given area, the one with the smallest perimeter is a square. b) Show that of all the rectangles with a given perimeter, the one with the greatest are is a square. Homework Equations As=x2 AR=xy Ps = 4x PR= 2x+2y The...

Homework Statement A right circular cylinder is inscribed in a cone with height h and base radius r. Find the largest possible volume of such a cylinder. Volume of a cylinder = (pi)(r^2)h Volume of a cone = (1/3)(pi)(r^2)h Homework Equations Volume of a cylinder = (pi)(r^2)h Volume...

Homework Statement A tank is initially filled with 1000 litres of brine, containing 0.15 kg of salt per litre. Fresh brine containing 0.25 kg of salt per litre runs into the tank at the rate of 4 litres per second, and the mixture (kept uniform by stirring) runs out at the same rate. Show...

Just want to make sure I am doing it correct! a Rectangle sheet of perimeter 36cm with dimensions x (vertical) and y (horizontal) is to be rolled into a cylinder where x= height and y= circumference. what values of x and y will give largest volume? Write volume in terms of only one variable...

Optimization problem -- Trouble differentiating function Homework Statement The efficiency of a screw, E, is given by E=\frac{(\Theta - \mu\Theta^{2})}{\mu + \Theta} , \Theta > 0 where \Theta is the angle of pitch of the thread and \mu is the coefficient of friction of the material, a...

Hi, this is my first post and most certainly not my last. I'm a young Mechanical Engineering major and I love math and physics, but on with my topic... I'm in Calc I and we've been assigned an extra-credit group project where to do present either a related rate or an optimization problem...

Homework Statement If you take an 8.5in by 11in piece of paper and fold one corner over so it just touches the opposite edge as seen in figure (http://wearpete.com/myprob.jpg ). Find the value of x that makes the area of the right triangle A a maximum? Homework Equations A = 1/2(xy)...

Homework Statement Maximize the functional \int_{-1}^1 x^3 g(x), where g is subject to the following conditions: \int^1_{-1} g(x)dx = \int^1_{-1} x g(x)dx = \int^1_{-1} x^2 g(x)dx = 0 and \int^1_{-1} |g(x)|^2 dx = 1. Homework Equations In the previous part of the problem, I computed...

Hello everybody! I guess my question is mainly concerned with numerical algorithms... Given a problem of the form min w = f(x) subject to g1(x)=0 : : gn(x)=0 where x is a m x 1 vector, n < m. From a numerical standpoint, how can I know whether it is preferably to solve it by setting up the...

Homework Statement Find the dimensions(r and h) of the right circular cylinder of greatest Surface Area that can be inscribed in a sphere of radius R. Homework Equations SA=2\pi r^2+2\pi rh r^2 + (\frac{h}{2})^2 = R^2 (from imagining it, I could also relate radius and height with r^2...

Homework Statement A piece of wire 8 cm long is cut into two pieces. One piece is bent to form a circle, and the other is bent to form a square. How should the wire be cut if the total enclosed area is to be small as possible? Keep \pi in your answer. Homework Equations A= \pi r^{2} A= lw...

Homework Statement What is the maximum area of an equilateral triangle and a square using only 20ft of wire? Homework Equations 20=4x+3y x=\frac{20-3y}{4} A=x^2+\frac{1}{2}y^2\sqrt{3} The Attempt at a Solution So then A=\frac{400-120y+9y^2}{16}+\frac{y^2\sqrt{3}}{4}...

Homework Statement A drilling rig 12 miles off shore is to be connected by a pipe to a refinery onshore, 20 miles down the coast from the rig. If underwater pipe costs $40,000 per mile and land based pipe costs $30,000 per mile what value of x and y would give the least expensive connection...

I just can't figure this problem out. Homework Statement You have four pieces of wood, two with length a and two with length b, and you arrange them in the shape of a kite (pieces of equal length placed adjacent to each other). You want to build a cross in the middle as a support. How...

I've got quite an unusual hobby project and so far, after couple of nights googling, I haven't found software that would fit the bill. I've got the truth table representing what I'd like to do and can minimize & map it to gates using Logic Friday. The problem is, I don't have NOR or NAND...

Hello, I am a CS graduate student, and I have a curious optimization problem which i need to solve, and have no idea where I should be looking for techniques for solving it. I have searched much material on optimization techniques, but still am not sure which subject this falls under. I would...

Homework Statement 1000m^2 garden. 3 sides made of wooden fence. 1 side made of vinyl(costs 5x as much as wood). Length cannot be more than 30% greater than the width. Find the dimensions for the minimum cost of the fence. Homework Equations 1000 = LW C = 2L + W + 5W The...

Homework Statement A vector d is a direction of negative curvature for the function f at the point x if dT \nabla ^2f(x)d <0. Prove that such a direction exists if at least one of the eigenvalues of \nabla ^2 f(x) is negative The Attempt at a Solution Im having trouble with this...

Hey guys this isn't exactly a homework question. I'm helping my girlfriend with her grade 12 college level math course. When i was in grade 12 i took calculus.. and she called me and asked for help with optimization. I don't think in her class they are learning about calculus so how would you...

A closed cyliindrical container has a volume of 5000in^3. The top and the bottom of the container costs 2.50$in^2 and the rest of the container costs 4$in^2. How should you choose height and radius in order to minimize the cost? v=pi(r)^2 Unfortunately my attempt at this problem is...

A closed box with a square base is to contain 252ft^3. The bottom costs 5$ per ft.^2, the top is 2$ft^2 and the sides cost 3$ft^2. Find the dimensions that will minimize the cost. As for equations we have v=lwh and I'm not sure as to how to find the next relative equation. I just...

Homework Statement Hello, Can you help me to understand the question..Ineed clarification and hints to solve the question.. A circle and a square are to be constructed from a piece of a wire of length l. 1-give an expression for the total area of the square and circle formed...

Homework Statement A cone-shaped paper drinking cup is to be made to hold 30 cm3 of water. Find the height and radius of the cup that will use the smallest amount of paper. Homework Equations volume of a cone (1/3)(pi)(r^2)(h) = 30 SA of a cone pi(r)[sqrt(r^2 + h^2)] The Attempt at...

Homework Statement the sum of the perimeters of an equilateral triangle and a square is 10. Find the dimensions of the triangle and the square that produce a minimum total area. Homework Equations The Attempt at a Solution my problem is finding the primary and secondary equations...

Optimization problem -- minimize cost Homework Statement A motor is floating on a buoy in a large pool with a perfectly flat shoreline. The motor is 3ft from the edge of the pool. A circuit to control operation of the motor is located 100ft from the closest point of the motor to the edge...

I have been working on this problem for 30 min and can;t seem to get anywhere. Question You have a amphibian vehicle which can travel 20 mph on the water and 52 mph on the land. You must find the quickest point from point A to C. -A is 20 Miles east of point B and is all land. -C is...

Homework Statement Find the dimensions of the right circular cone of maximum volume that can be inscribed in a sphere of radius 15cm.Homework Equations The Attempt at a Solution let r be radius of circular base of cone let y be height of small right triangle let h be height of cone r^2 +...

Question: Cost of producing cylindrical can determined by materials used for wall and end pieces. If end pieces are 3 times as expensive per cm2 as the wall, find dimensions (to nearest millimeter) to make a can at minimal cost with volume of 600 cm3. Relevant equations: a) V=600cm3=[pi]r2h b)...