Saturday

December 10, 2016
Total # Posts: 2,563

**chemistry**

if the beaker was wet at the beginning of the experiment for the inital mass of the beaker, how would that affect the experimentally determined number of molecules of water in the hydrate?

*October 27, 2010*

**calculus problem**

Suppose and object is traveling directly from the earth to moon. The mass of the earth is 5.9742 x10^24 kg, the mass of the moon is 7.349 x 10^22 kg, and the mean distance from the earth to the moon is 384,000km. For an object between the earth and the moon, how far from earth...

*October 27, 2010*

**Western Experience : Since the sixteenth century**

Thank you Ms. Sue

*October 26, 2010*

**Western Experience : Since the sixteenth century**

How did imperialism impact non-western economies? How did Europeans achieve these transformations of local economies? What were the effects of those transformations?

*October 26, 2010*

**Western Experience**

yes Ms. Sue

*October 26, 2010*

**Western Experience**

in what ways did the alliance system, implemented to maintain a peaceful balance of power in Europe, in fact have the opposite effec?

*October 26, 2010*

**Chem**

Which of the following will be more soluble in an acidic solution than in pure water? 1.PbBr2 2.CsClO4 3.Cd(OH)2 4.Ag2(SO4) 5.BaSO3 How can I find which is which? Could you tell me the best way to find which one is more soluble? Thank you!

*October 26, 2010*

**Chem**

The question is; About Fe+2 concentration will Fe(OH)2 precipitate from a buffer solution that has a PH = 9.29? The Ksp of Fe(OH)2 is 4.87x10^-17 So here is what I did, Ksp = (x) (2x)^2 = 4x^3 4.87x10^-17 = 4x^3 x = 2.30x10^-6 I don't know what do I have to do after this. ...

*October 26, 2010*

**physics**

Hurricanes can involve winds in excess of 120 km/h at the outer edge. Make a crude estimate of the energy of such a hurricane, approximating it as a rigidly rotating uniform cylinder of air (density 1.3 kg/m^3) of radius 120 km and height 4.5 km. Make a crude estimate of the ...

*October 26, 2010*

**Social Studies**

In what way is a state different from a country?

*October 25, 2010*

**chemistry 101**

the valve between a 3.00-L tank containing O2(g) at 6.00 atm. and a 5.00-L containing N2(g) at 1.20 atm. is opened. Calcualte the ratio of partial pressures (O2:N2) in the container?

*October 25, 2010*

**chemistry **

if k2O, SrO, and Al2O3 are all correct formulas, predict the formulas for the oxides of Rb, Mg, & Ga. i think the answers are Rb2O, MgO,& Ga2O3 but im not sure why

*October 23, 2010*

**Chem**

I stuck on this prob. Can you help me to do this? 10.00 mL of a solution containing 0.20 M NaCl and 0.25 M AlCl3 is introduced into a cation exchange column. How many moles of hydronium ions will be released by the column?

*October 22, 2010*

**algebra**

one side of a triangle is three time the shortest side. The third side is 7 feet more than the shortest side. The perimeter is 62 feet. Find all three sides.

*October 20, 2010*

**English**

Could you tell me if these sentences are correct? I have to identify the linking verbs. 1. I have grown weary of television. 2. She has been late every day this week. 3. You should be hungry after all that work. 1=have grown 2=has been 3=should be

*October 20, 2010*

**Project topic ideas**

i have a question could i do a project on to encourage more people to vote

*October 20, 2010*

**Project topic ideas**

great i have an idea now

*October 20, 2010*

**Project topic ideas**

Any ideas on a public service activity for a project that can be done by interviews surveys phone conversations etc..

*October 20, 2010*

**math**

explain in words how to solve 39 + five squared - 96 * 7 / (9 - 4)

*October 18, 2010*

**Chem**

I stuck on this problem. Can you help me to solve it? A reaction mixture in a 3.67L flask at a certain temp. initially contains 0.763g H2 and 96.9g I2. At equilibrium, the flask contains 90.4g HI. Calculate the equilibrium constant(Kc) for the reaction at this temp. H2(g) + I2...

*October 17, 2010*

**calculus, please help **

A fish is reeled in at a rate of 3.2 feet per second from a point 10 feet above the water (see figure). At what rate is the angle between the line and the water changing when there is a total of 25 feet of line out? (Round your answer to three decimal places.)

*October 14, 2010*

**statistics**

what percentage of students studied between 30 and 40 hours? Range 10-50, Mean- 35, standard deviation-5.

*October 14, 2010*

**statistics**

What percentages of students studied 30 hours or less? These hours ranged between 10-50 hours with a mean of 35 and a standard deviation of 5.

*October 14, 2010*

**statistics**

What percentages of students studied 30 hours or less? These hours ranged between 10-50 hours with a mean of 35 and a standard deviation of 5.

*October 14, 2010*

**Business**

What are some of the operations management practices that can help bring manufacturing back to the U.S?

*October 14, 2010*

**calculus**

Thank you very much

*October 14, 2010*

**calculus**

please help if you can At a sand & gravel plant, sand is falling off a conveyor and onto a conical pile at a rate of 16 cubic feet per minute. The diameter of the base of the cone is approximately three times the altitude. At what rate is the height of the pile changing when ...

*October 14, 2010*

**Calculus**

How to simplify for ln(3+e^8)?? I thought It could be ln3+8. But it was wrong. Help me!

*October 13, 2010*

**math**

Complete the table: Input Output 3 7 4 9 0 1 7 ?

*October 12, 2010*

**6th grade math**

thanks

*October 12, 2010*

**math**

Sorry there is no x

*October 12, 2010*

**math**

what is the value of x in the equation? 2(b-3)+5=3(b-1) (may you solve it step by step.

*October 12, 2010*

**math**

y = 3 x^4 +5/4 x y'=

*October 12, 2010*

**math**

y = 3 t^6 − 7 √t + 9/t y'=

*October 12, 2010*

**Math**

thanks

*October 12, 2010*

**Math**

14 grams=__kg

*October 12, 2010*

**math**

its a her and Shonda is a lady. a)p=(24.95-0.8)n-575 b)p=(24.95+0.8)n+575 c)=24.95n-574.20 d)p=24.95n+ 575 and how?

*October 12, 2010*

**allied health**

D.

*October 12, 2010*

**Chem**

I got one more question. I tried to figure out what should it be. But still I don't have idea yet... Help me please.... The question is The expected absorbance range for the solutions to be tested is between 0.01 and 0.1. Describe what Simon will need to do to have ...

*October 12, 2010*

**Chem**

Then, What should be the unit for 9.625? I thought that is the absorbance. So I used nm unit which is for absorbance.

*October 11, 2010*

**Chem**

I have no idea What to do. What does it mean by 'draw what you think the visible range spectrum of this dye would look like.' To get the A, I used Beer's law. So I got 9.265nm for Absorbance. What should I do for the next? The question is ----Next Simon checks the ...

*October 11, 2010*

**math**

A new software company wants to start selling DVDs with their product. The manager notices that when the price for a DVD is 20 dollars, the company sells 139 units per week. When the price is 34 dollars, the number of DVDs sold decreases to 91 units per week. Answer the ...

*October 10, 2010*

**math**

A new software company wants to start selling DVDs with their product. The manager notices that when the price for a DVD is 20 dollars, the company sells 139 units per week. When the price is 34 dollars, the number of DVDs sold decreases to 91 units per week. Answer the ...

*October 10, 2010*

**math**

find the equation of the circle passing through (-1,2)(2,6)(6,3)

*October 10, 2010*

**Chem**

The experiment is about titration of vinegar with NaOH. Before I start titration, I need to calculate how much of vinegar I will want to be using. I think I might use 50ml of distilled water to mix vinegar and I am gonna drop 3drops of phenolphthalein as indicator. Please help...

*October 10, 2010*

**Chem**

Given that Kw = 2.4x10^-14 at 37 celsius, compute the PH of a neutral aqueous solution at 37 celsius, which is the normal human body temperature. Is PH = 7 solution acidic, basic, neutral at 37 celsius? Thank you!!!!!!

*October 9, 2010*

**chemistry**

Thank you, I was using the wrong one.

*October 8, 2010*

**chemistry**

I have tried using that equation but I keep getting 4.something. My answer should be around 9.

*October 8, 2010*

**chemistry**

do i work this out the same way i do a pH problem with one volume?

*October 8, 2010*

**chemistry**

.70 L of a buffer solution that is 0.120 M in NH3 and 0.450 M in NH4Cl are diluted to 5.80 L with distilled water. What is the pH of the buffer? Kb of NH3 = 1.8 x 10^-5

*October 8, 2010*

**math**

A new software company wants to start selling DVDs with their product. The manager notices that when the price for a DVD is 20 dollars, the company sells 139 units per week. When the price is 34 dollars, the number of DVDs sold decreases to 91 units per week. Answer the ...

*October 8, 2010*

**math**

Fabulous!!! Thank you so much!!! He's having trouble grasping the concept so I didn't want to confuse him!! Thank you thank you thank you!!!!

*October 7, 2010*

**math**

8999 = 9000 8999 = 9000 8999 = 9000 I'm helping my 3rd grader and I'm getting confused!! (sad part is, I do basic math everyday!! LOL) And thank you so much for all your help!

*October 7, 2010*

**math**

round to the nearest thousand, nearest hundred, nearest ten 8999

*October 7, 2010*

**math**

round to the nearest ten 3,490

*October 7, 2010*

**math**

Round to the nearest thousand, nearest hundred, and the nearest ten 7509

*October 7, 2010*

**math**

3y+6y^3-2y^2+5y^3+5y^2-4y+2

*October 7, 2010*

**math**

3y+6y^3-2y^2+5y^3+5y^2-4y+2

*October 7, 2010*

**science**

What are the functions of indicator in acid-base titration?? Thank you!

*October 7, 2010*

**Ohlone**

how many moles of oxygen are consumed in burning 1.6 moles of benzene, C6H6?

*October 7, 2010*

**math 5th grade**

(17-A)SQUARED=2209 SOLVE FOR A

*October 6, 2010*

**physical ed sports**

name the six positions on a volleyball court IN SERVING ORDER(1st-6th)beginning with the first player serve.

*October 6, 2010*

**Bio**

Given an allele frequency of o.91 for a hypothetical red allele (bead), the percentage of blue alleles residing in the heterozygotes would be? a) 89% b) 90% c) 91% d) 92% e)93% i don't even know how to approach this question

*October 6, 2010*

**physics**

Water flows (v approx. 0) over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.

*October 5, 2010*

**physics**

A 120-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 400 N. For the first 17 m the floor is frictionless, and for the next 17 m the coefficient of friction is 0.34. What is the final speed of the crate?

*October 5, 2010*

**3rd grade**

No couse 71 is a huge jump from 80

*October 4, 2010*

**marketing**

. In your own words describe at least three activities that represents each characteristic of a CRM plan; share of customer, lifetime value of a customer, customer equity or high-value customers.

*October 4, 2010*

**physics**

A 120 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 400 N. For the first 17 m the floor is frictionless, and for the next 17 m the coefficient of friction is 0.34. What is the final speed of the crate?

*October 4, 2010*

**statistics**

A survey of 40 clothing stores reported these numbers of sales held during a randomly selected year 11-15,16-20,21-25,26-30, 31-35, 36-40 and the frequencies are 3,5,12,9,8,3 Caculate the mean variance and standard deviation

*October 4, 2010*

**statistics**

A survey of 40 clothing stores reported these numbers of sales held during a random,ly selected year

*October 4, 2010*

**science**

What does the () around an element mean, for example Mg(OH)2

*October 3, 2010*

**Chem**

You are titrating an unknown weak acid you hope to identify. Your titrant is a 0.0935 mol/L NaOH solution, and the titration requires 22.3 mL to reach the equivalence point. How many moles of acid were in your sample?

*October 3, 2010*

**Physics Help!**

A force of 36.1 N is required to start a 4.0 -kg box moving across a horizontal concrete floor. If the 36.1 N force continues, the box accelerates at 0.71 m/s^2. What is the coefficient of kinetic friction? I got 0.072 as my answer and this is showing as incorrect. I did: 36.1...

*October 1, 2010*

**physics**

I got 0.072 as my answer and this is showing as in correct. I did: 36.1 - mu x 4.0kg x 9.8 = 4.0kg x 0.71 0.71 / 9.8 = 0.072

*October 1, 2010*

**physics**

A force of 36.1 N is required to start a 4.0 -kg box moving across a horizontal concrete floor. If the 36.1 N force continues, the box accelerates at 0.71 m/s^2. What is the coefficient of kinetic friction?

*October 1, 2010*

**math**

wow thank you now I understand

*September 29, 2010*

**math**

yes, I don't understand how to solve the problem

*September 29, 2010*

**math**

write in order from least to greatest the six numbers whose digits are 2,8,and 9

*September 29, 2010*

**Stats**

Instructions for Data Sets: In each data set, the dependent variable (response) is the first variable. Choose the independent variables (predictors) as you judge appropriate. Use a spreadsheet or a statistical package (e.g., MegaStat or MINITAB) to perform the necessary ...

*September 29, 2010*

**English**

What is the verb, the subject, the predicate nominatives, and direct object in the folling sentence 1.In September of 1739, David Brainerd entered Yale College. 2. Yale was a good school for young preachers. 3. After four months of school, Mr. Brainerd caught the measles. 4. ...

*September 29, 2010*

**Alg. II**

Solve y=Arcsin 1/2 A.) -5pi/6 B.) 5pi/6 C.) -pi/6 D.) pi/6

*September 28, 2010*

**Accounting**

What is the relationship between the amounts on the adjusted trial balance for an account and its ledger? Why is it necessary to prepare the formal financial statements if all the data are on the adjusted trial balance? I am having problems finding the answer to thsee two ...

*September 28, 2010*

**college- Physics**

David is driving a steady 24.0m/s when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.70m/s^2 at the instant when David passes. How far does Tina drive before passing David? What is her speed as she passes him?

*September 27, 2010*

**Science- Physics**

David is driving a steady 24.0m/s when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.70m/s^2 at the instant when David passes. How far does Tina drive before passing David? What is her speed as she passes him?

*September 27, 2010*

**physics**

A boat moves through the water of a river at 5 m/s relative to the water, regardless of the boat's direction. If the water in the river is flowing at 1.6 m/s, how long does it take the boat to make a round trip consisting of a 180 m displacement downstream followed by a ...

*September 27, 2010*

**statistics**

12) The regression equation Credits = 15.4 - .07 Work was fitted from a sample of 21 statistics students. Credits is the number of college credits taken and Work is the number of hours worked per week at an outside job. A) Interpret the slope. B) Is the intercept meaningful? ...

*September 27, 2010*

**Statistics**

12.22 A regression was performed using data on 16 randomly selected charities in 2003. The variables were Y = expenses (millions of dollars) and X = revenue (millions of dollars). (a)Write the fitted regression equation. (b)Construct a 95 percent confidence interval for the ...

*September 26, 2010*

**5th grade English**

Lake Baikal is in southeast Siberia. I have to identify the adjectives. southeast

*September 22, 2010*

**college physics**

A swimmer is heading straight for the other shore of a river with a velocity of vs=0.7 m/s relative to the water, but is carried away by the current, which has a velocity of vr=0.3 m/s. It takes her 20.3 s to get across. How far downstream does she end up? Can someone please ...

*September 22, 2010*

**algebra 1**

arlene house of beauty offer a package of three facial for $48 each. your best friend hear that you plan to purchase the package from arlene and offers todothe work on you herself she wants you to buy any supplies needed and pay her $12 per hour for her time. the supplies you ...

*September 21, 2010*

**chemistry**

A scientist wants to make a solution of tribasic sodium phosphate, \rm Na_3PO_4, for a laboratory experiment. How many grams of \rm Na_3PO_4 will be needed to produce 575 mL of a solution that has a concentration of \rm Na^+ ions of 1.00 \it M?

*September 19, 2010*

**chemistry**

A scientist wants to make a solution of tribasic sodium phosphate, \rm Na_3PO_4, for a laboratory experiment. How many grams of \rm Na_3PO_4 will be needed to produce 575 mL of a solution that has a concentration of \rm Na^+ ions of 1.00 \it M?

*September 19, 2010*

**chemistry**

What mass of carbon dioxide is produced from the complete combustion of 8.20×10−3 g of methane?

*September 19, 2010*

**Statistics**

The average mpg usage for a 2004 Ford Expedition 2WD for a sample of 10 tanks of gas was 17.0with a standard deviation of 0.8. For a Ford Explorer 2WD, the average mpg usage for a sample of 10 tanks of gas was 18.5 with a standard deviation of 1.0. (a) Assuming equal variances...

*September 19, 2010*

**Statistics**

A survey of 100 mayonnaise purchasers showed that 65 were loyal to one brand. For 100 bath soap purchasers, only 53 were loyal to one brand. a) Perform a two-tailed test comparing the proportion of brand-loyal customers at á=.05.b) Form a confidence interval for the ...

*September 19, 2010*

**math**

sean is buying a player for $315. interest free payment plan. pays $25 each month. a. how much will he owe after 1 payment? 2 payments? 3 payments? b. use n to stand for the number of payments and a for the amount still owed. write an equation for calculating a for any value ...

*September 15, 2010*

**Algebra 2**

I've got some homework about ellipses and I am not sure if I am doing these right. So if you could check my answers I would appreciate it. Thanks!! 1.) Write an equation for an ellipse if the endpoints of the major axis are at (1,6) and (1,-6) and the endpoints of the ...

*September 14, 2010*

**economics**

10. 10. The amount of time an individual is willing to offer for a wage depends on the a) all of the following b) value of time devoted to leisure activities c) boredom, discomfort, and aggravation associated with work d) value of time devoted to nonmarket work e) satisfaction...

*September 14, 2010*

**statistics**

Use Excel to find the p-value for each test statistic.a. Right-tailed test, t = +1.677, n = 13 b. Left-tailed test, t = −2.107, n = 5 c. Two-tailed test,t = −1.865, n = 34

*September 13, 2010*

**statistics**

Find the p-value for each test statistic. a. Right-tailed test, z=+1.34 b. Left-tailed test, z=−2.07 c. Two-tailed test, z=−1.69

*September 13, 2010*