Thursday
April 24, 2014

Posts by Luke


Total # Posts: 283

math
correct

math
Make f the subject of the formula D = squareroot p/f-p

make
make f the subject of the formula: D=square root p/f-p

math
if f(x)=1-3x/2+x find an exact value of f(-1/2)

maths
exact value for tan(7pi/6 radians)

japan
How do you say the restaurant is located inside the hotel. れすとらんはほてるのなかです

economics
A firm has production of cars in 2 countries with the following demand: Sweden: P= 300- 5Q Denmark: P= 150- 3Q Marginal cost for both countries= $40 per unit Will this company price discriminate, and if yes, which type of price discrimination will it use? What are the conditio...

Physics
Why has no one answered this?

Chandra
A building is the shape of an airplane hanger (a half cylinder). Construction for the foundation (rectangular part) costs $30 per square foot, the sides (semicircle bases) cost $20 per square foot and the roofing cost $15 per square foot. The volume of the entire building is 2...

Engineering
What caution must be exercised in the use of models

college
Why is it not possible to formulate a model that accurately represents reality

Chemistry
which metal does not require having its charge specified in the names of ionic comppounds it forms? a. Au b. Ca c. Cu d. Cr e. Fe

chemistry
in regard to the reverse freezing process of water(when it expands) and others molecules contract.. is it only water that does this or is it all the hydrogen bonded molecules?? ( N,O,F) NH3, H20 anf FH...my science teacher doesn't know the answer and i'd really like to...

math
S=5d/7

PHYSICS
A potential energy function for a two-dimensional force is of the form U = 2.46x3 y - 5.05x (which has units of J). Calculate the force that acts at the point (1.26 m,1.18 m).

PHYSICS
If it takes 4.12 J of work to stretch a Hooke's law spring 12.1 cm from its unstressed length, determine the extra work required to stretch it an additional 10.0 cm.

PHYSICS
Estimate the terminal speed of a wooden sphere (density 0.700 g/cm3) falling through air if its radius is 3.20 cm and its drag coefficient is 0.470.

PHYSICS
A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 23.0 degrees with the horizontal. A piece of luggage having mass 31.0 kg is placed...

physics
thanks for your help drwls.

Physics
thanks a lot. that really helped.

Physics
A fire helicopter carries a 615 kg bucket of water at the end of a cable 19.5 m long. As the aircraft flies back from a fire at a constant speed of 40.5 m/s, the cable makes an angle of 35.2o with respect to the vertical. Calculate the force of air resistance on the bucket

Physics
thanks a lot. that really helped.

Physics
Three forces acting on an object are given by F1 = (-8.79i + 8.34j) N, F2 = (7.06i + -3.02j) N, and F3 = (-3.05i) N. The object experiences an acceleration of magnitude 2.26 m/s2. What are the components of the acceleration vector?

algebra
I know its true but why? When you multiply a whole number by a whole number the result is a larger number. When you multiply fractions the result is a smaller number.

Pre Algebra
Solving part of a part. How do you use thermometers to solve fraction problems?

10th grade Physics
What experiment(apparatus can be made) can be used to determine the relationship between period and frequency of vibration?

Spanish QUestions LOOK DOwn please!!!
PLease look down. Thank you.

spanish
Write the correct conjugation of tener for the following sentences: 9. ¿Por qué _________ (Jose) sueño por la mañana? 10. Mi amiga _________ tres hijos. 11. ¿Cómo se dice "Patricio tiene ganas de comer" en inglés? 12. ...

11th Grade chemistry
How to get pure gold from impure gold..please specify the chemical equation.. any example is fine,e.g. AuCl3 -> Au

geography
Latitude lines measure distance in degrees north and south of this? is it equator?

Algerbra
Thank you

Algebra 2
Thanks

Algebra 2
Thanks reiny for your help.

Algebra 2
and would I do this oen the same way? 7. 2x^4 + 16x

Algebra 2
Thank you. So can that be factored anymore?

Algebra 2
I would really appreciate it someone helped me with this information. 1. Solve the inequality: |3 - 3x/4| >= 9 Solve for x 2.(x - 2)(x + 1) = 4 and factor completely 64 + a^3

Algebra 2
Can someone help me solve this and break it down step by step please??? [Sqrt(x-3)]-[Sqrt(x+2)]=3

physics
a remote controlled car's wheel accelerates at 22.4 rad/s^2. if the wheel begins with an angular speed of 10.8 rad/s what is the wheel's angular speed after exactly 3 full turns?

math
the rainfall this year was 18.6 cm. this is 3.2 cm less than half of the rainfall last year. what was the rainfall last year?

Algrebra
Thank you for your help.

Algrebra
Would the answer be no souliton?

Algrebra
NO it's postive 21

Algrebra
Please faCtor. Thank you for your help. a^2 + 4a + 21

11th grade visual art
first of all this is my first time so i dont know if i am doing it right. I need help i have holiday homework that i need to do but i cant find good enough info for question 1 and i dont understand how to do question 2 below i will write homework exactlty the same as i have it...

10th grade math
23.333333333333333333333333333333 ... i think

calculus
consider the following function: f(x)=sqrt(50-x) find the linear approximation of f(x) at a=1

chemistry
a metal sample weighing 45.0g and at a temperature of 99.1C was place in 38.6g of water in a calorimeter at 25.0C. the calorimeter reached a maximum temperature of 32.8C. 1. calculate the specific heat of the metal. 2. what is the approximate molar mass of the metal?

Chem
A) 8 - 3.45 = 4.55 B) 29 - 25.30 = 3.70 C) 29 - 21.15 = 7.85 D) (I had the same homework) 1.effective nuclear charge 2.principle quantum number

Math
There is a long fence along the border of 2 mens property. 1 man is using the existing fence to make a cattle pen. He has 500 ft of fencing. Suppose the pen extends x ft away from the existing fence along the border. Find an expression for the area in terms of x.

physics
resists motion

physics
The force of ..... acts to transfer mechanical energy to thermal energy.

history
i need to know some specific info like what was damaged, how many people died, how many people got injured, etc.

history
thanks!

history
can you give me more info for 9/11 (patriot day)?

math ( Ms,Sue)ans i got
for part 2 of the questions is it six $1.00 stamps + one $2.50 + one $1.20 and four $4.00 and how do i find the largest number of stamps that she can use from the collection to post a parcel and to list them

math
in a series of stamps annie must buy six of each one cost $4.00 one cost $2.50 one cost $1.20 one cost $1.00 she had to post a parcel and totals cost of postage was $25.70.what stamps can she use from the selection to make up this amount using a)as many $4.00 stamps as possibl...

chem
For the gaseous equilibrium represented below, it is observed that greater amounts of PCl3 and Cl2 are produced as the temperature is increased. PCl5(g) <===> PCl3(g) + Cl2(g) a) What is the sign of S° for the reaction? Explain. b) What change, if any, will occur in ...

Brainteaser
It could be. I think the question leaves too much to the imagination!

Brainteaser
A man is on his hands and knees looking for a £5 note he has dropped. His search for the fiver continues for some time. Finally in the corner of the room he finds it. What is the first thing he does? Anyone know this?????

language arts
a person who studies and collects rocks for fun

Chemistry
Predict the sign of ( ∆H) in each of the following reactions: NH3 (g) + HCl (g) NH4Cl(s) ∆S = +, ∆G = - Fe (s) + Cu+2 (aq) Fe+2 (aq) + Cu(s) ∆S = +, ∆G = - Cl2 (g) + 2Na (s) 2NaCl (s) ∆S = +, ∆G = -

science
Predict the sign of ( ∆H) in each of the following reactions: NH3 (g) + HCl (g) NH4Cl(s) ∆S = +, ∆G = - Fe (s) + Cu+2 (aq) Fe+2 (aq) + Cu(s) ∆S = +, ∆G = - Cl2 (g) + 2Na (s) 2NaCl (s) ∆S = +, ∆G = -

chemistry
sorry, didnt even see that. how does 0.6973 sound?

Science
i want to know how you could get electric to an island in the middle of nowhere.

Physics: Equilibrium and Inclined Planes
12.8

Geometry
okay, thanks anyway.

Geometry
How do you divide a hexagon into 9 congruent parts?

Geometry
Find the value of z. Then find GE and EH and state whether E is the midpoint of line GH. GH = z + 6. EH =2z-4. GE=z.

Spanish
One of the countries in Central America uses Spanish as the official language of the country but also has 23 different Maya groups; each with its own dialect. What country is it?

math
what would x^2+y^2-4x+2y=0 (Equation for a cirlce) be in r^2=(x-h)^2(y-k)^2 form? tnx I will start you off... x^2+y^2-4x+2y=0 x^2-4x+y^2 +2y =0 x^2-4x+ 4 + y^2 +2y+ 4 =+ 4+ 4 (x^2-4x+ 4) + (y^2 +2y+ 4) =8

Math
Hi how would i solve this?? The equation of the cirlce is x^2+y^2-4x+2y=0. Determine the coordinates of the center and the radius of the circle. What do i do? anyone

Math
hi how would we solve a question like this? for the curve with eq'n 2x^2 - x - 1 y= _______________ x^2 - 2x - 3 determina all x- and y-intercepts I assume you meant y = (2x^2 - x - 1)/(x^2 - 2x - 3) both top and bottom factor but there is no advantage gained. However, the...

Math
I have no clue how to do this as no values were given and im confused. can someone explain plz? if x^3-y^3=m and x-y=N, express xy in terms of M and N This is one of those pure manipulation problems. you have to know that x^3-y^3 = (x-y)(x^2+xy+y^2) so n(x^2+xy+y^2)=m (x^2+xy+...

math-factoring
hi i was reading through the tutorials and havent really understood how to factor out a trinomial like 12x^4 - 5x^2y^2 - 2y^4 what would the 1st few steps be? Do a substitution: let v= x^2 and u= y^2 Now you have... 12v^2 - 5uv - 2u^2 (3v -2u)(4v+u) then go back and put the x ...

math
I'm not good at math! I need help with finding a decimal from a fraction. like 1/3, 13/15, 19/32 I can't figure out how to turn it into a decimal! Just divide the numerator by the denominator. Use long division or a pocket calculator. can u help mme because i get f,s a...

why is noone answering my question?!?!
A rational function that passes through (0,0) and (4, 8/7) has the x-axis as a horiztonal asympotote. It also has 2 vertical asymptotes x=3, x=-3. I understand that to set it up, it is y= ax+b / (x+3)(x-3). I dont understand how to solve for a and b. Put in the points. You hav...

rational functions
A rational function that passes through (0,0) and (4, 8/7) has the x-axis as a horiztonal asympotote. It also has 2 vertical asymptotes x=3, x=-3. I understand that to set it up, it is y= ax+b / (x+3)(x-3). I dont understand how to solve for a and b. ;;;;;;;;.¸__________...

rational functions... PLEASE HELPPPPP
A rational function that passes through (0,0) and (4, 8/7) has the x-axis as a horiztonal asympotote. It also has 2 vertical asymptotes x=3, x=-3. I understand that to set it up, it is y= ax+b / (x+3)(x-3). I dont understand how to solve for a and b.

chem
what does coefficients in equations mean, in chemical terms? 2NaCl means we have two molecules or 2 mols of NaCl. Most texts caution us not to use molecules but to stick with the latter part of the definition (moles); however, I don't have any problem with saying, 2H2 + 2 ...

chemistry 12
what is the relationship between ka and kb? Kw=ka*kb

the big idea of energy
im cool =]

chemistry
When 1.0 mol of ammonia gas in injected into a o.50L flask, the following reaction proceeds to equilibrium. 2NH3 <--> N2 (g) + 3H2 (g) At equilibrium, 0.30 mol of hydrogen gas is present. a) calculate the equilibrium concentrations of N2 and Nh3. b) what is the value of ...

lord of flies essay approach
CHEAT

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