Friday

September 19, 2014

September 19, 2014

Total # Posts: 1,834

**chemistry**

An electron of wavelength 1.74*10-10m strikes an atom of ionized helium (He+). What is the wavelength (m) of the light corresponding to the line in the emission spectrum with the smallest energy transition?
*March 25, 2013*

**chemistry**

An electron of wavelength 1.74*10-10m strikes an atom of ionized helium (He+). What is the wavelength (m) of the light corresponding to the line in the emission spectrum with the smallest energy transition?
*March 25, 2013*

**Chemistry (Immunoassays)**

What is the common component that makes a homogeneous competitive immunoassay? Describe one.
*March 24, 2013*

**calculus **

A polynomial function p(x) has a relative maximum at (3, -4) a relative minimum at (-1, -6), a relative maximum at (-5, 2) and no other critical points. How many zeros does p(x) have?
*March 23, 2013*

**College Chemistry/Lab Math**

Thanks for the help!
*March 17, 2013*

**College Chemistry/Lab Math**

Why did you multiply 0.0001g of gold/mL by 0.10mL? Shouldnt it be .50 mL? I say this because .10 is the volume of serum added, which does not contribute to the total amount of gold in the final solution.
*March 17, 2013*

**College Chemistry/Lab Math**

Sorry, in my 3rd step it should be "(.5ml)/(1)"
*March 17, 2013*

**College Chemistry/Lab Math**

I think I have this problem figured out correctly, but is there anyone who can tell me if I'm doing something wrong. The question is... "One troy ounce of gold is worth $380. There are 33.8 grams per troy ounce. You have a stock colloidal solution of a very fine gold ...
*March 17, 2013*

**math**

The diagram shows a sector OAB of a circle, centre O and radius10 cm. Angle AOB is theta radians. The point C lies on OB and iss such that AC is perpendicular to OB. The region R is bounded by the arc AB and by the lines AC and CB. The area of R is 22cm^2 1. show that theta=0....
*March 16, 2013*

**math**

How do I measure 5.25% of a 6% bleach for 1 gallon?
*March 15, 2013*

**math**

How do I measure 5.25% of a 6% bleach for 1 gallon?
*March 15, 2013*

**Chemistry **

For the reaction ? FeCl2 + ? Na3PO4 → ? Fe3(PO4)2 + ? NaCl what is the maximum mass of Fe3(PO4)2 that could be formed from 5.25 g of FeCl2 and 1.62 g of Na3PO4? Answer in units of g
*March 13, 2013*

**math**

Help
*March 11, 2013*

**math**

16/28 as a percent and round to the nearest percent
*March 11, 2013*

**Statistics**

The 60th percentile of a normal distribution is 110. The 70th percentile is 120. Find the 90th percentile.
*March 7, 2013*

**Statistics**

Find the 35th percentile of the normal distribution with mean 270 and SD 25.
*March 7, 2013*

**Statistics**

Fill in the blank: 50% of the area under the standard normal curve is between -0.5 and _____________.
*March 7, 2013*

**Statistics**

The average weight of a group of people is 156 pounds and the SD is 25 pounds. A statistician wants to transform the weights so that the transformed weights have an average of 100 pounds and an SD of 10 pounds. Fill in the blanks; both blanks must be filled in correctly for ...
*March 7, 2013*

**Fin 3oo**

The Lo Tech Co. just issued a dividend of $ 2.20 per share on its common stock. The company is expected to maintain a constant 6 percent growth rate in its dividends indefinitely. If the stock sells for $ 43 a share, what is the company’s cost of equity?
*March 3, 2013*

**maths and physics**

A particle of mass 4 kg is attached to one end of an inelastic string and a particle of mass 2 kg is attached to the other end of the string.The string has length 4m and is hung over a smooth pivot at its midpoint. The Pivot lies 3m above the ground.How long does it take for ...
*March 3, 2013*

**Math**

There are 38 animals at a farm .some are cows and some are chickens . All together there are 124legs. How many cows and how many chickens?
*March 2, 2013*

**Math**

There are 38 animals at a farm.some are cows some are chickens all together there are 124 legs . How many cows and how many chickens?
*March 2, 2013*

**Math**

Thanks Steve I understand
*February 27, 2013*

**Math**

George walks 3 km on Monday and 4 km of Tuesday and 2.5 km on Thursday . On Monday, he walked 25 mins., Tuesday 40 mins., and Thursday 30 mins. What is his average speed? t= D=
*February 27, 2013*

**Spanish: PLEASE HELP**

Please help. Thank You. 1. The stem-changers in the current section are similar to those in the previous section except these stem-change "o" to "oe." *A.) true B.) false 2. Of the following, which is not a stem-changing verb? A.) almorzar *B.) comer C.) ...
*February 26, 2013*

**math**

6. Solve by factoring. m² + 8m + 7 = 0 (1 point)8, 7 –7, 1 *–7, –1 7, 1 7. Solve by factoring. n² + 2n – 24 = 0 (1 point)–12, 2 –2, 12 *–6, 4 –4, 6 Please Help
*February 26, 2013*

**Spanish: Please help**

Please help. Thank You. 1. The stem-changers in the current section are similar to those in the previous section except these stem-change "o" to "oe." A.) true B.) false 2. Of the following, which is not a stem-changing verb? A.) almorzar B.) comer C.) ...
*February 26, 2013*

**Spanish**

Please help. Thank You. 1. The stem-changers in the current section are similar to those in the previous section except these stem-change "o" to "oe." A.) true B.) false 2. Of the following, which is not a stem-changing verb? A.) almorzar B.) comer C.) ...
*February 26, 2013*

**Spanish: Please help**

Please help. Thank You. 1. The stem-changers in the current section are similar to those in the previous section except these stem-change "o" to "oe." A.) true B.) false 2. Of the following, which is not a stem-changing verb? A.) almorzar B.) comer C.) ...
*February 26, 2013*

**Spanish: Please check answers**

Thank You.
*February 26, 2013*

**Spanish: Please check answers**

Please check my answers. The answers are at thebottom. 11. Choose the most logical sentence completion. Yo _______ el libro a la biblioteca. vuelvo devuelvo puedo duermo 12. Choose the most logical sentence completion. Ellos __________ en el café. cuestan cuentan ...
*February 26, 2013*

**Chemistry**

A 0.010M solution of base B is 15% dissociated. Calculate the Kb for base B.
*February 24, 2013*

**physics**

You are working in an ice skating rink and have been asked to hang a new banner on the wall. Your friend is helping you so that the ladder does not collapse by exerting a force FAL at an angle relative to the horizontal. how do you set this up?
*February 24, 2013*

**physics 12**

a certain binary star system consists of two stars of masses m and 3m respectively separated by a distance of 1.5 x 10^12 m, measured between their centres. Theres stars revolve in sync with each other around their common centre of mass like a giant dumbbell. If the smaller ...
*February 19, 2013*

**math**

. A bag contains 3 marbles: a red one, a white one, and a green one. Suppose that two marbles are selected without replacement. (a) How many outcomes are in the sample space? List them (b) What is the probability that a red marble, and then a green marble (in that order) are ...
*February 19, 2013*

**math**

If you invested a penny on Jan 1,1776 at 10% interest compounded daily, how much would you have on jan 1 2011?
*February 18, 2013*

**math**

if you invest $25,000 in an account that gets 12% annual interest compounded quarterly, how much would you have in 10 years?
*February 18, 2013*

**Inter. Reading**

Are the answers below correct: My aunt has only rigor success in quitting smoking. Every few months she succumb to temptation, and then she has to quit all over again. Choose from: Intermittent,Succumb and rigor.
*February 18, 2013*

**Ap calc **

Consider the function h(x) = a(-2x+1)^5-b, where a doesn't equal 0 and b doesn't equal 0 are constants. A. Find h'(x) and h"(x) B. show that h is monotonic ( that is, that either h always increases or remains constant or h always decreases or remains constant...
*February 18, 2013*

**Euclid's Geometry , geometric constructions**

Find the area of the triangle whose vertices (on cartesian graphs) are (-1,5) , (-2,-3) & (10,1)
*February 18, 2013*

**ap calc **

a particle moves along the x-axis so that its velocity at any time t is equal to or > 0 is given by v(t)= (2pie-5)t-sin(piet) a.find the acceleration at any time t. b.find the minimum acceleration of the particle over the interval [0,3] c.find the maximum velocity of the ...
*February 17, 2013*

**ap calc **

a particle moves along the x-axis so that its velocity at any time t is equal to or > 0 is given by v(t)= (2pie-5)t-sin(piet) a.find the acceleration at any time t. b.find the minimum acceleration of the particle over the interval [0,3] c.find the maximum velocity of the ...
*February 17, 2013*

**Drama**

I'm just wondering why are the senses important in drama?
*February 14, 2013*

**Math**

A taxi company charged $4.40 for a 2 mile trip. It charges certain amount for each 1/5 mile traveled. It charges twice as much for the first 1/5 mile. How muchis charged for the first 1/5 mile and each 1/5 mile after the first one?
*February 13, 2013*

**calculus**

Consider the given function and the given interval. f(x) = 4 sin x − 2 sin 2x, [0, π] (a) Find the average value fave of f on the given interval. fave = (b) Find c such that fave = f(c). (Round your answers to three decimal places.) c = (smaller value) c = (larger ...
*February 11, 2013*

**physics**

8. Electric field lines arising from two small charged particles P and Q. Consider the following two statements: i.The charge on P is smaller than the charge on Q. ii.The electrostatic force on P is smaller than that on Q. Which of the above statements are true? A) Only i. B) ...
*February 9, 2013*

**physics**

1. When an ideal gas is expanded adiabatically in volume at constant pressure, the average kinetic energy of the gas molecule: A. Increase B. decreases C. Does no change i know the answer is B but can someone explain why please? i thought it does not change since its ...
*February 9, 2013*

**MAth**

A model length of 12 cm. represents an actual length of 102 feet. What is the scale model?
*February 8, 2013*

**physics**

A football player runs the pattern given in the drawing by the three displacement vectors A, B, and C. The magnitudes of these vectors are A = 5.0 m, B= 15 m, and C = 18 m. Using the component method, find the magnitude and direction è of the resultant vector
*February 8, 2013*

**HARD PHYSICS**

which way do electric-field lines point, from high to low potential or from low to high? Explain please
*February 7, 2013*

**chemistry**

Calculate the molarity of a solution that contains 48g of NaCl in 250ml of solution.
*February 7, 2013*

**Organic chemistry**

ok. Thank you so much for your help.
*February 6, 2013*

**Organic chemistry**

Well .4ml of ethyl acetate, But then it tells you to to .4 ml pf ligroin
*February 6, 2013*

**Organic chemistry**

So if ethyl acetate was the solvent, then what was the ligroin used for?
*February 6, 2013*

**Organic chemistry**

A diels-Alder reaction of cyclopentadiene with Maleic Anhydride experiment was conducted in lab. But I was wondering why we added ligroin to the maleic anhydride and ethyl acetate. I know ligroin can be used as a solvent and it is also nonpolar, though ethyl acetate is also a ...
*February 6, 2013*

**math**

input/output 0 0 2 0 6 0 8 0 -3 -6 -4 -8
*February 6, 2013*

**chemistry**

a 0.25 mol sample af neon gas at 18 C and 0.700 atm is heated to 40 C. the new gas pressure is 1.11 atm. what is the change in volumn of the neon gas?
*February 4, 2013*

**english**

Howard likes birds. simile or not simile?
*January 30, 2013*

**ss**

What was the significance of the court case of Plessy vs. Ferguson
*January 29, 2013*

**Math**

f(x)=x+4; f(x^2), (f(x))^2
*January 28, 2013*

**Analytical Chemistry **

The question: The pH of a solution is defined as pH = -log[H3O+]. If the pH of a solution is 3.72(+/- 0.03), what is the [H3O+] and its absolute standard deviation? Answer: How would I carry this out? I know to find the hydronium concentration wouldn't i just take e^3.72? ...
*January 28, 2013*

**precal**

If the half-life of a certain radioactive substance is 2000 years, estimate how many years must elapse before only 35% of the radioactive substance remains?
*January 22, 2013*

**algebra 1**

3v-4
*January 19, 2013*

**math 209**

find the value of annuity for a 1=$3000, I=0.09, n= 25
*January 15, 2013*

**its urgent math i need the answer fast**

Fist what is a better buy
*January 14, 2013*

**its urgent math i need the answer fast **

Price: 5.49 Unit Rate: 0.04 Price: 1.50 Unit Rate: 0.02 how much would you save in one year?
*January 14, 2013*

**Hard math**

2x^3-x^2-6x __________ 2x^2-7x+6
*January 13, 2013*

**math**

Factor 5(x^2+4)^4 (2x)(x-2)^4+(x^2+4)^5(4)(x-2)^3
*January 10, 2013*

**Chemistry**

Okay. Thanks for your help.
*January 10, 2013*

**Chemistry**

Here is what I came up with, but not sure if it is correct. 2 moles of NaOH = 79.994g NaOH 79.994g/1L * 1L/1000mL * 100mL/1g = 7.9
*January 10, 2013*

**Chemistry**

Okay... Where did you get 10/40? Also, where would the 79.994g of NaOH come in?
*January 10, 2013*

**Chemistry**

I've been working on this problem for hours and cant figure it out. I know it should be simple, but I'm stuck... The question is... Describe how to prepare 1.00L of a 1.0% (w/v) NaOH from a 2.0 M NaOH. *I need to figure out how many ml of the stock solution is needed. ...
*January 10, 2013*

**Physics**

You place two charges a distance r apart. Then you double each charge and double the distance between the charges. How does the force between the two charges change? a) The new force is twice as large. b) The new force is half as large. c) The new force is four times as large...
*January 10, 2013*

**Reading**

IN And then there were none by agatha christe which character changed the most and y: in a paragraph? I need to write a 3 paragraph essay on who changed the most in the book, and i don't know who to choose? please help me!
*January 9, 2013*

**Physics**

The New England Merchants Bank Building in Boston is 152 high. On windy days it sways with a frequency of 0.12 , and the acceleration of the top of the building can reach 2.5 of the free-fall acceleration, enough to cause discomfort for occupants. What is the total distance, ...
*January 8, 2013*

**Physics**

A 492g oscillator has a speed of 99.5 cm/s when its displacement is 3.60 cm and 72.5 cm/s when its displacement is 5.10 cm. What is the oscillator's maximum speed? I'm suck with this problem, can someone please go through it with me step by step, please and thanks
*January 8, 2013*

**History**

Among the legislative acts passed during Franklin Roosevelt’s first term as president, which one gave relief to artists, actors, and writers?
*January 7, 2013*

**Chemistry **

A number of antacid tablets contain water-insoluble metal hydroxides such as milk of magnesia, Mg(OH)2. Stomach acid is about 0.10 mol/L HCl(aq). Calculate the number of millimetres of stomach acid that can be neutralized by 500 mg of Mg(OH)2 (s).
*January 6, 2013*

**math**

can you order 2/3 3/4 5/6 from least to greatest
*January 4, 2013*

**english language arts**

first one to answer gets 200 points
*December 30, 2012*

**english language arts**

3. Identify the simple sentence. (1 point) A. In 1970, my mother graduated from Point Pleasant Boro High School. B. The gymnast swung around the bar, and the coach stepped on the mat. C. The tornado bypassed the town, but the townspeople remained in their shelters. D. The ...
*December 30, 2012*

**HCA415**

In your opinion, what two features have had the greatest impact on improving health status and quality of life throughout history? Explain why you selected these features and provide examples to support your opinion. Please give me examples. Thanks.
*December 30, 2012*

**math**

A bacteria population is currently exactly one million and increasing at a linear rate of 15 per second. What will the population be in two weeks?
*December 29, 2012*

**Accounting**

statement that the difference between the opening bank balance ($30,000) and the January statement balance ($75,000) is pure profit.
*December 21, 2012*

**physics**

The force required to stretch a Hooke’s-law spring varies from 0 N to 68.1 N as we stretch the spring by moving one end 16.2 cm from its unstressed position. Find the work done in stretching the spring
*December 20, 2012*

**Physics**

A Knight of the Round Table ﬁres oﬀ a vat of burning pitch from his catapult at 17 m/s, at 29 ◦ above the horizontal. The acceleration of gravity is 9.8 m/s 2 . How long is it in the air? Answer in units of s
*December 19, 2012*

**math i don't get it**

plz help me
*December 18, 2012*

**Math probability**

What is the probability that a randomly drawn 6-cards hand from a standard deck.... B) contains at least four clubs? C) contains at most three clubs?
*December 18, 2012*

**Math ave grade**

a student scores 76,82,83 on the first three test, she has a 92 homework averge. if the final exam is 50% of grade and homework is 10% and the test average (nit including the final) is 40% then what grade should she get on the final exam to get a 87.5 in the class?
*December 16, 2012*

**Algebra**

How do I write 7t+7/-6 divided by 4t+4/15 in lowest terms ?
*December 16, 2012*

**Science**

A spring has a force constant of 50000 N/m. How far must it be stretched for its poten- tial energy to be 22 J? Answer in units of m
*December 14, 2012*

**Math**

If P(x) is a polynomial with P(–6) = –1.12 and P(–5) = 0.6 then which of the following must be true? A. There is a zero for P(x) between x = –6 andx = –5. B. There is a zero for P(x) between x = –1.12 and x = 0.6. C. There is a zero for P(x) ...
*December 14, 2012*

**Mathsa**

4. Graph the inequality: x ≤ –2 (1 point)
*December 13, 2012*

**Mathsa**

that wat i said
*December 13, 2012*

**Mathsa**

sooooooo are u saying c is the wrong answr
*December 13, 2012*

**Mathsa**

4. Graph the inequality: x ≤ –2 (1 point)
*December 13, 2012*

**Mathsa**

what do you mean????
*December 13, 2012*

**Mathsa**

i think the andswer is c am i right steve
*December 13, 2012*

**Mathsa**

Which of the following equations has an infinite number of solutions? (1 point) 3x – 3 = –4x 2y + 4 – y = 16 7x + 5 = 4x + 5 + 3x 6y – 2 = 2(y – 1)
*December 13, 2012*

**Mathsa**

cn u hepl me on this one 4. Graph the inequality: x ≤ –2 (1 point)
*December 13, 2012*

Pages: <<Prev | 1 | 2 | 3 | **4** | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>