Friday

January 20, 2017
Total # Posts: 46

**math**

The locus of a point whose distance from point (0,5) is always 3/4 of its distance from the line Y=8 is an elipse. Find the equation,centre, length of the major axis, length of the minor axis and the foci of the ellipse.

*December 18, 2016*

**calculus**

Find the area of the region cut from the first quadrant by the curve r=2(2-sin2?)½

*November 25, 2016*

**Maths**

Thanks steve for a brilliant answer! Got one last one which is gobbledegook to me. Two functions f and g are defined by f:x(arrow)x^2 + 3 g:x(arrow)2x + 1 find: a) the function fg b)solve the equation f(x) = 12g^-1(x) Many Thanks!!!!

*November 21, 2012*

**Maths (Linear and Quadratic Equations)**

I need to solve a pair of equations where one is linear and the other is quadratic. 2x2 + 3xy + y2 = 0 3x + y = 2 last 2 in 2x2 is square root two, same after y2. help please!!!!!!!!!!!!!!!

*November 21, 2012*

**chemistry**

calculate the work performed if a balloon contracts from 12.32L to 422 ml due to an extermal pressure of 3.1 atm

*December 12, 2011*

**physics**

A uniform solid cylinder of radius R and a thin uniform spherical shell of radius R both roll without slipping. If both objects have the same mass and the same kinetic energy, what is the ratio of the linear speed of the cylinder to the linear speed of the spherical shell?

*December 5, 2011*

**physics**

A 200g bottle has a mass of 340g when filled with water and 344g when field with blood plasma. what is the density of plasma?

*December 5, 2011*

**calculus**

find the are of the surface of the part of the sphere (x^2)+(y^2)+(z^2)=4 that lies above the plane z=4

*December 5, 2011*

**calculus**

find the volume of the solid obtianed by rotating the region bounded by the given curves about the line x=6 x=y^2 , x=1

*December 5, 2011*

**Calculus**

Calculate the derivative.? d/dx ∫ from √x to x^2 tan9tdt = Use symbolic notation and fractions where needed.

*December 4, 2011*

**math**

A factory produces bicycles at a rate of 80+0.3t^2−1.1t bicycles per week (t in weeks). How many bicycles were produced from day 15 to 21?

*December 4, 2011*

**chemistry**

calculate the volume of 0.080 acetic acid needed to prepare 4.0 L of aceic acid solution with a PH of 4.00 L=

*December 3, 2011*

**chemistry**

when 1.00 g of stearic acid ( a saturated fatty acid) is dissolved in water, then diluted to exctly 10.00 ml, the PH of the resulting solution is 2.73.the fornula weight of steric acid is 284.5. calculate ka and pka for this acid

*December 3, 2011*

**chemistry**

calculate the volume of 0.050 acetic acid needed to prepare 4.0 L of aceic acid solution with a PH of 3.80 L=

*December 2, 2011*

**Chemistry**

A 4.00 L solution of KOH is prepared by diuling 400.0 m 0f 0.290 M KOH with warer [OH-]=

*December 2, 2011*

**chemistry**

calculate the Ph in the titration of 50.00 ml of 0.100 M ammonia with 0.100 M HCl after 0,24.00,50.00, and 74.00 ml acid have been added Ka((NH3)= 1.8x10^(-5) PH= ............ when 0 ml added. PH= ............ when 24.00 ml added PH= ............ when 50.00 ml added PH...

*December 2, 2011*

**chemistry**

calculate the PH during the titration of 50.00 ml of 0.300 M HNO3 with 0.600 M KOH after 0, 15.50, 25.00, and 40.00 ml of KOH have been added. Graph the titration curve. Ph=

*December 2, 2011*

**chemistry**

calculate the PH during the titration of 50.00 ml of 0.300 M HNO3 with 0.600 M KOH after 0, 15.50, 25.00, and 40.00 ml of KOH have been added. Graph the titration curve

*December 2, 2011*

**calculus**

Calculate R8 for f(x)=8−x over [3,5]. R8=

*November 25, 2011*

**calculus**

Calculate R8 for f(x)=8−x over [3,5]. R8=

*November 24, 2011*

**calculus**

Calculate R8 for f(x)=8−x over [3,5]. R8=

*November 24, 2011*

**calculus**

find L- Hospital lim x-> inf f(x)=1/e^(-x)

*November 21, 2011*

**calculus**

find L- Hospital lim x_---- inf 1/e^(-x)=

*November 21, 2011*

**calculus**

Find the radius and hight of cylinder with voume 64π and radius r between 1 and 5 that has smallest possible surface area. A cylinder of radius r and hight aah 2π^2+2π r h and π r ^(2) h.

*November 21, 2011*

**chemistry**

calculate the half-life of a first- order reaction if the concentration of the reactant is 0.0396 M at 12 seconds after the reaction starts and is 0.00579 M at 47 after the reaction starts. How long does it take for the reactant concentration to decrease to 0.00269 M

*November 18, 2011*

**chemistry**

calculate the half-life of a first- order reaction if the concentration of the reactant is 0.0396 M at 12 seconds after the reaction starts and is 0.00579 M at 47 after the reaction starts. How long does it take for the reactant concentration to decrease to 0.00269 M

*November 18, 2011*

**chemistry**

How long would it take for the concentration of the reactant to drop to one-forurth its initial value? initial concentration of reactant=0.64mol/L half-life=30s

*November 18, 2011*

**Chemistry**

if the initial concentration of the reactant in the first order reaction A→products is 0.64 mol/L and the half-life is 30 s, calculate the concentration of reactant 120 s after initiation of the reaction

*November 18, 2011*

**calculus**

Find the angle that maximizes the area of the isosceles triangle whose legs have length l=31 angle=

*November 13, 2011*

**calculus**

it says the answer is incorrect

*November 13, 2011*

**calculus**

Find the angle that maximizes the area of the isosceles triangle whose legs have length l=31 angle=

*November 13, 2011*

**calculus**

Your task is to design a rectangular industrial warehouse consisting of three separate spaces of equal size.? The wall materials cost $58 per linear foot and your company has allocated $27840 for those walls. 1) The dimensions which use all of the budget and maximize total ...

*November 13, 2011*

**calculus**

A box is constructed out of two different types of metal. The metal for the top and bottom, which are both square, costs $4 per square foot and the metal for the sides costs $4 per square foot. Find the dimensions that minimize cost if the box has a volume of 50 cubic feet. ...

*November 11, 2011*

**calculus**

Suppose that 404 ft of fencing are used to enclose a corral in the shape of a rectangle with a semicircle whose diameter is a side of the rectangle. Find the dimensions of the corral with maximum area. x=........ft Y=......ft

*November 11, 2011*

**calculus**

Find a point c satisfying the conclusion of the Mean Value Theorem for the following function and interval. f(x)=x^−1 [1,9]

*November 6, 2011*

**calculus**

Estimate 1/(sqrt(82)) using linear approximation and the exact value for 1/(sqrt(81)) Your estimate:

*October 30, 2011*

**calculus**

A searchlight rotates at a rate of 4 revolutions per minute.? The beam hits a wall located 13 miles away and produces a dot of light that moves horizontally along the wall. How fast (in miles per hour) is this dot moving when the angle between the beam and the line through the...

*October 30, 2011*

**calculus**

A searchlight rotates at a rate of 4 revolutions per minute.? The beam hits a wall located 13 miles away and produces a dot of light that moves horizontally along the wall. How fast (in miles per hour) is this dot moving when the angle between the beam and the line through the...

*October 30, 2011*

**Calculus**

it says the answer is incorrect

*October 30, 2011*

**Calculus**

Use the Linear Approximation to estimate ∆f=f(3.5)−f(3) for f(x)=2/(1+x^(2))? Δf ≈ Estimate the actual change. (Use decimal notation. Give your answer to five decimal places.) Δf= Compute the error and the percentage error in the Linear ...

*October 30, 2011*

**Calculus**

A 15 ft ladder leans against a wall. The bottom of the ladder is 4 ft from the wall at time t=0 and slides away from the wall at a rate of 3ft/sec. Find the velocity of the top of the ladder at time t=2. The velocity of ladder at time t=2 is ........ft/sec.

*October 29, 2011*

**calculus II**

Find the volume of the solid obtained by rotating the region under the graph of the function f(x)=e^x about the x-axis over the interval [0,2].

*June 5, 2011*

**calculus II**

Find the volume of the solid obtained by rotating the region under the graph of the function f(x)=(2)/(x+1) about the x-axis over the interval [0,4].

*June 5, 2011*

**calculus II**

Find the volume of the solid obtained by rotating the region under the graph of the function f(x)=x^8/9 about the x-axis over the interval [1,2].

*June 5, 2011*

**calculus**

A street light is at the top of a 19 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 5 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 40 ft from the base of the pole? Rate =

*April 24, 2011*

**Calculus**

A street light is at the top of a 19 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 5 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 40 ft from the base of the pole?

*June 20, 2010*

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