Friday
July 25, 2014

Posts by anna


Total # Posts: 1,925

chemistry
Calculate the molarity of the commercial bleach before it was diluted. bleach 6.25%

physics
water at 20°C has viscosity n=1.0*10^-3 Ns/m^2. sand grains have density 2400kg/m^3. suppose a 1.1 mm diameter sand grain is dropped into a 51m deep lake whose water is a constant 20°C. If the sand grain reaches terminal speed almost instantly (a quite good approximati...

physics
A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.5 x 10 exponent 5 kg, its speed is 27.0 m/s and the net braking force is 4.30 x 10 exponent 5 N, (A) what id its speed 7.50 s later? (b) how far has it traveled in this time?

chemistry
and what is the theoretical yield?

chemistry
a student set up a reaction with 0.2905g of cholesterol and 0.13g of nonanoyl chloride in excess triethylamine, and collected 0.0244g of solid product. what is the actual yield (in grams) of cholesteryl nonanoate? explain how to do this please :)

calculus
thanks!

calculus
Find all values of 'a' such that y=a/(x−9) and y=x^2−18x+81 intersect at right angles. show steps please :)

MATH
A town decides to build a playground using one of the existing walls beside an elementary school. What is the maximum area they can enclose using only 100ft of donated fence?

physics
Suppose a 46-N sled is resting on packed snow. The coefficient of kinetic friction is 0.11. If a person weighing 625 N sits on the sled, what force is needed to pull the sled across the snow at constant speed?

science
How does the Kinetic Theroy of Heat explan Solids, Liquids, and gasses?

science
What is the difference in Thermal Energy and Heat.

Phyisical science
How much energy is in a soccer ball that is moving at 3 m/s and has a mass of 2kg.

chemistry
A 48 g sample of water at 98.°C is poured into a 55 g sample of water at 15°C. What will be the final temperature of the mixture?

Please check drwls
1.C 2.d 3.A I don't know is it correct.

Chemistry
What would be the products of this chemical reaction?? Co(NO3)2 (aq) + NH3 (aq) = ?????? a precipitate is supposed to be formed.

chemistry
CH3OH(g) ----> CO(g) + 2H2 (g) (delta H =+90.7k) A) is heat absorbed or released in the course of this reaction? b) calculate the amount of heat transferred when 45.0g of CH3OH(g)is decomposed by this reaction at constant pressure. c) for a given sample of CH3OH, the enthal...

chemistry
72g

accounting
Describe the relationship of the financial statements used in the financial plan for 2010 for Patton-Fuller Community Hospital.

Chemistry
Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH

Chemistry
Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH

Chemistry
Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH

Chemistry
Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH

Science
a question regarding Universal Law Of Gravitation. If the clouds are 50 km. high , what is its proportional distance to a globe which is one foot in diameter ? Thank you :))

Economics
I'm trying to research for a paper about why we shouldn't have flat tax rate, and a reason that i'm seeing people putting online, is that a flat tax rate of say, 18% would decrease tax revenue? Can someone explain how? I don't understand how taxes work.

improving it without changing its overall meaning
Ever been assigned to work on a group project for class! Many students dread group projects: because one student typically does most of the work. Unfortunately for some, group work does not end when students leave school, many employers use teams to accomplish ongoing project...

science
A 4.3 "kilo" bag of sugar is on a counter. How much work is required to put the bag on a shelf a distance of 0.43 m above the counter?

math
draw a diagram to show how to find the solution 2.6 / 0.4 explain what the quotient means

Math
Pedro says the next expression in the following pattern is n+17,n+18,n+15,n+16,n+13,n+14._____ . Explain his error and write the correct expression.

Politics
I'm writing a speech, and it's about the topic "Private sector investment is preferable to public sector investment for Human Space Exploration" I'm on the con side for this argument, and one of my reasons was that public sector will spur cooperation, whi...

physics
A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.5 x 10^5 kg, its speed is 27.0 m/s and the net braking force is 4.30 x 10^5 N, (A) what id its speed 7.50 s later? (b) how far has it traveled in this time?

HELP!!!!!!!!!GEOMETRY!!!!
THANK YOU

HELP!!!!!!!!!GEOMETRY!!!!
WHAT IS THE PERIMETER OF A SQUARE WHOSE VERTICLES ARE A(-4,-3), B(-5,1), C(-1,2), AND D(0,-2)?

Computer Science
An advertising agency wants to send a letter to all of its clients announcing a new fee schedule. The clients' names are in several different lists (arrays). The company merges the various lists to form one array, but clients could be listed in the array more than once. De...

algebra
Ms. Sue, I apologize, but all I'm getting is answers, I need to know how to work them out myself as my teacher didn't make himself clear.

algebra
how do i simplify -10 - (-7n) + (-9n)

AP Biology
What is important for reproducing animals? i dont exactly understand the question, help!!

stats
women age 20-29 is 36ml staandard deviation 7ml. What is probability greater than 45ml and between 30 and 62 ml

algebra
3 (x-8)

algebra 1
What is the "quotient" of 19 and m?

Math
Solve for a: a^-1 + b^-1 = 1

Math
Thank you so much! What I did wrong was pluck in the wrong equation

Math
A line has a slope of m = -1/3 and passes through the points (-4,k) and (2,3). Fine the value of k

Math
Solve for x: 6/x + 8/9 = 10/3x

calculus
(a) Modifying the parametric equations of a unit circle, find parametric equations for the ellipse: x^2/a^2 + y^2/b^2 = 1 (b) Eliminate the parameter to find a Cartesian equation of the curve x=2sint; y=4+cost; t >(or equal to) 0

Precalc(attn Bobpursley)
Hi i posted this before but I wanted to ask Bobpursley a few questions on his reply 1)For the first function you used cosine when they ask for sin, why is that? Also why did you put .5 in the beginning and end of the function? 2)For the second question why did you put 10 in fr...

Precalc
okay sorry last two questions! I promise! The sun always illuminates half of the moon’s surface, except during a lunar eclipse. The illuminated portion of the moon visible from Earth varies as it revolves around Earth resulting in the phases of the moon. The period from a...

Precalc
of course! thanks!

Precalc
Okay for this question I know I am supposed to use the law of sines. But how can i tell what side is what? In right triangle ABC, a = 120 and c = 140, and ÐC is the right angle. Solve the triangle. Round to the nearest tenth, if necessary.

Precalc
oh I see thank you very much I totally get it now

Precalc
How do you know to use cos and not sine?

Precalc
oops sorry never mind

Precalc
where did the 12 come from?

Precalc
I am having trouble figuring out this question Jan observes a buoy bobbing up and down through a total amplitude of 8 feet. Beginning at the top of the wave, if the buoy completes a full cycle every 8 seconds, what is the height of the buoy relative to its lowest point after 1...

math
Thanks hon!

math
(f-g) (fx)=1/x+2 g(x)= 3x I got -3x^2-6x+1/x+2 is this correct?

Precalc
Hello I need help with this question. I know that the formula for angular velocity is w= theta/time. I also know that the answer is 750 rpm. I am just not sure how to get that answer A truck driver travels at 58 miles per hour. The truck tires have a diameter of 26 inches. Wha...

calculus
The integral of sinx is from 2pi to infinity

calculus
Recall that a function G(x) has the limit L as x tends to infinity, written lim(x->infinity)G(x) = L, if for any epsilon > 0, there exists M >0 so that if x > M, then |G(x) − L| < epsilon. This means that the limit of G(x) as x tends to infinity does not e...

integral
thanks

integral
complete the integral e^(x^1/3)

Alg 2
a rectangular picture frame measures 8 inches by 4 inches. You want to triple the frame's area by adding the same distance, x, to the length and width. Find the value of x and find the new dimensions of the frame. How do you do this?? Please show work

MicroEcon
The market for apple pies in the city is competitive and has the following demand schedule: Price Quantity Demanded $1 1,200 2 1,100 3 1,000 4 900 5 800 6 700 etc... 13 0 Each producer in the market has fixed costs of $9 and the following marginal cost: Quantity Marginal cost ...

geometry
what kind of triangle has sides of lenght 12,16,24?

medical coding
A condensed summary compiling information about a particular field of knowledge is a a. compendium b. compliance manual c. treatment guidelin d.pharmacopeiae

Spanish
Thanks so much for the explanation! I understand the reason now.

@SraJMcGin Spanish
oh and for 16) i got por

@SraJMcGin Spanish
El abuelo de Guillermo le cuenta sobre un viaje en barco a Espana. Completa el parrafo con por o para. Cuando fui a Espana (12____) primera vez, se viajaba (13____). Estuve en el oceano (14____) diez dias (15____) una tormenta horrible. Pero, (16____) ser un viaje tan largo, ...

Spanish
El abuelo de Guillermo le cuenta sobre un viaje en barco a Espana. Completa el parrafo con por o para. Cuando fui a Espana (12____) primera vez, se viajaba (13____). Estuve en el oceano (14____) diez dias (15____) una tormenta horrible. Pero, (16____) ser un viaje tan largo, m...

Spanish
Oh!!! I understand now! Wow, that really cleared it up for me! Muchas gracias Sra! This will really help me with the rest of my class.

Spanish
oh thank you! one more question: for 9. if it is the familiar command aren't i supposed to take comer drop the -er and add the opposite ending so it becomes coma? so shouldn't the answer be C?

Spanish
Gracias Sra! Sorry for the trouble at first!

Spanish
of course, I am so sorry for the inconvenience! Choices A) dar por sentado B) descomponerse C) comprensivo D) el caparazon E) herir Statements to Match With Choice 1. Usualmente los amigos son así si tenemos problemas y necesitamos a alguien para escucharnos y hacernos ...

chemistry
what is the experimental errors in determining the formula unit of zinc chloride?

math
Thank you Henry! I really appreciate your help! :) Great!

math
I cant figure this thing out fully, I feel so clueless. Does anyone have any pointers or tips for me? Company needs a new copy machine. Rent costs are = 17.5 cents / each. Number of copies = atleast 200 000. (The company agrees to buy at least that number) Buying the unit cost...

Spanish
4. ¿Qué pasa? ¿No me oyes? A) si, te oigo. B) si, les oigo. C) no, no se oigo. D) no, no me oigo. 7. Le compro un regalo para mi hermana. A) se la compro esta tarde. B) me lo compro esta tarde C) te las compro esta tarde. D) se lo compro esta tarde. 9. Te...

Cultural Diversity
the lanaguage learning approach of certain non-mainstream cultures seems to require children to do what in regards to human speech

chemistry
As a lab, we will be given a small amount of calcium and will be told to find the mass of it without using a scale( using stoichiometry or mols?) I just don't know how to do this! Thanks!

algebra
yes

Math
The length and width of the field as a ratio of 11:7. The width is 20 meters less than the length. How many m2 is the area?

Spanish-7th grade-Please check
hmm.. i would say 1 because the picture does not show the family actually watching t.v.

CHEMISTRY
If one added 130 mL of 2 M NaOH to 1 L of a buffer composed of 2.3 M NH3 and 3.2 M NH4Cl, what would be the pH of the resulting solution? The Kb of NH3 is 1.8 × 10−5.

History
Can i have a short summary of the spanish conquest 1492-1580? main events, ex: slave trade, colonization, etc

7th grade math
-2(8-4)-8(-6-8)= im notsure how to do this can someone please explain how to do this and what the answer is, i keep coming up with 2 but thats not right. i need help!

trig
determine all trig functions of theta using the given info, state the answers correct to the nearest hundredth. cos (theta) = -5/13; tan (theta) < 0

trig
determine all trig functions of theta using the given info, state the answers correct to the nearest hundredth. cos (theta) = -5/13; tan (theta) < 0

Chemistry
Calculate the theoretical pH after 2.50ml and 9.50ml of NaOH has been added in both the titration of HCl and of HC2H3O2.

chemistry
for the vaporization of water at 1.00 atm, delta H=43.54 kj/mol at 298 K and delta H= 40.68 kj/mol at 373 K. the constant-pressure heat capacity of liquid water is 75.3 J/molK. calculate the constant pressure heat capacity for H2O(g).

Science
A 7-kg brick is dragged across the floor by a horizontal force of 42 N. If a frictional force of 18 N also acts on the brick, what is its acceleration?

Science
To determine the mass percentage of an iron sample, the dissolved sample [iron exists at the start as iron(II)] was titrated with potassium permanganate (permanganate forms manganese(IV) oxide.)If 22.25 cubic cm of 0.0123 potassium permanganate, what is the mass percent of iro...

science
A skateboarder initially traveling at 1.8 m/s accelerates at a rate of 1.5 m/s squared for 2.5 s. How far does the skateboarder go in this time? What is the equations used, variable solving for, and of course the solution.

science
If we were to watch a sunset, how long is it from the time the Sun begins to set until it is dark?

Geometry
Find the area of a regular octagon with a perimeter of 80 inches round to the nearest tenth

spanish
Using the subject “usted” and the verb in the imperative, tell your instructor three things she or he must do. Then tell your instructor two things she or he must not do. You will be graded on accuracy and pronunciation. Provide your sentences in Spanish.

Chemistry-Plz see this DrBob
Thank you so so much!!!

Chemistry-Plz see this DrBob
I am sorry I do not know what happens the symbolism, so I just deleted the symbols. Is it works for you that deleted the symbols? Using standard reduction potentials, calculate the standard Ecell, emf, for each of the following reactions. State if each reaction is spontaneous ...

Chemistry- Please help!!
Using standard reduction potentials, calculate the standard Ecell, emf, for each of the following reactions. State if each reaction is spontaneous or nonspontaneous. (Use the below reactions AS WRITTEN, DO NOT REARRANGE ANY REACTIONS.) You must show the two half-reactions and ...

Chemistry- Please help!!
Using standard reduction potentials, calculate the standard E¡Æcell, emf, for each of the following reactions. State if each reaction is spontaneous or nonspontaneous. (Use the below reactions AS WRITTEN, DO NOT REARRANGE ANY REACTIONS.) You must show the two half-...

Chemistry
Using standard reduction potentials, calculate the standard E¡Æcell, emf, for each of the following reactions. State if each reaction is spontaneous or nonspontaneous. (Use the below reactions AS WRITTEN, DO NOT REARRANGE ANY REACTIONS.) You must show the two half-...

Chemistry Please help!!
An electrochemical cell that uses the reaction Ti^3+ + 2Cr^2+ -> Ti^1+ + 2Cr^3+ Has a standard cell potential of E¢ªcell = +1.19V a. Write the two half-cell reactions. b. Determine the E¢ªred(reduction).

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