Saturday

August 27, 2016
Total # Posts: 2,299

**Chemistry**

The rate law of a reaction, A-> B+C is given by the expression: Rate=k, where k=0.0113 mol/L min. If the initial concentration of the reactant is 0.225 mol/L, how long does it take for the concentration to decrease to 0.180 mol/L? I know i have to find the order of the ...
*September 14, 2010*

**calculus**

Find the limit L. Then find delta > 0 such that |f(x) - L| < 0.01 whenever 0 < |x-c| < delta. lim x -> 4 (4- (x/2))
*September 14, 2010*

**algebra 1b**

Arianna kicks a soccer ball off the ground and in the air with an initial velocity of 42 feet per second. Approximately what maximum height does the soccer ball reach?
*September 14, 2010*

**College Chemistry**

Help Please.
*September 14, 2010*

**College Chemistry**

This is based on the Collision theory.
*September 14, 2010*

**College Chemistry**

Which of the following changes generally lead to greater reaction rates? (I)Increasing the temperature (II)Decreasing the concentration of a reactant or (III) adding a catalyst I know that change in temperature influences the reaction, in this case it speeds up and that adding...
*September 14, 2010*

**algebra**

In 1995, the life expectancy of males in a certain country was 70.1 years. In 1999, it was 73.6 years. Let E represent the number of years since 1995. The linear function E(t) that fits the data is E(t) =_____ t +______.(Round to the nearest tenth) Use the function to predict ...
*September 14, 2010*

**chemistry**

30.2 g
*September 11, 2010*

**chemistry**

How many grams of na3po4 will be needed to produce 425ml of a solution that has a concentration of na+ ions of 1.30 M?
*September 11, 2010*

**math**

5x=-15
*September 11, 2010*

**scientist**

Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in ...
*September 10, 2010*

**Chemistry**

(3.9)*(0.9025J)*(Tfinal-99.3)+(10)*(4.184J)*(Tfinal-22.6)=0 (3.51975J)*(Tfinal-99.3)+(41.84J)*(Tfinal-22.6)=0 45.35975JTfinal-1295.095175=0 1295.095175/45.35975=28.6 degrees celsius
*September 10, 2010*

**math**

Saturn is 6 times further from the Sun than Mars. Define a variable and write and expression for the distance of Saturn from the Sun. Not the same person
*September 8, 2010*

**Physics (Oscillation)**

If a particle moves in simple harmonic motion with a frequency of 3.00 Hz and an amplitude of 5.00 cm through what total distance does the particle move during one cycle of its motion, what is its maximum speed, where does this maximum speed occur and what and where does the ...
*September 8, 2010*

**com155**

So how did you do on this? I have the same assignemnt but I have come up with different answers than yours. How did you do?
*September 8, 2010*

**Chemistry**

Thanks I just figured it out too. I appreciate your help.
*September 7, 2010*

**Chemistry**

A solution is prepared by dissolving 5.00g of an unknown molecular solid in water to make 500 ml of solution. The osmotic pressure of the solution is 1.61 atm at 25 degrees C. What is the molar mass of the solute? This is what ive done so far: M= 1.61atm/(0.0821Lxatm/molxK)(...
*September 7, 2010*

**algebra**

solve algebraically x^2 + y^2 = 16 x - y = 4
*September 6, 2010*

**algebriacally.**

x^2 - y^2 = 9 y = 4
*September 6, 2010*

**equation**

Solve algebraically and check y = x^2 - 3 x + y = -1
*September 6, 2010*

**IT/Business/Law?**

Do I have to register for copyright protection of works of art including writing, photographs and digital images?
*September 5, 2010*

**science**

an object will accelerate in free fall because the only force accting on it is gravity True or false
*September 3, 2010*

**Math**

Can someone please tell me what the vertex and line of symentry would be for r(x)=-3(x+3)^2.. Thank you
*August 30, 2010*

**College Chemistry**

Help please.
*August 30, 2010*

**College Chemistry**

Complete the following table for aqueous solutions of caffeine, C8H10O2N4. Find: Molality Mass Percent Solvent Ppm Solute Given: Mole Fraction Solvent = 0.900 Molar Mass is 194.2g i believe.
*August 30, 2010*

**basic college reading**

main idea of mythMyth 2: You have to read every word. Some experts suggest that you don’t need to read every word of a passage. This is particularly true once you break your reading task into steps with distinct purposes. For example, the first step in SQ3R is to survey. ...
*August 25, 2010*

**basic college reading**

find the mainMyth 1: You only need to read the material once. Textbooks are packed with too much information to understand, much less retain, in one reading session. This is particularly true if the information is new and unfamiliar. Most students who can read and retain ...
*August 25, 2010*

**Physics 221**

Hydraulic engineers in the United States often use, as a unit of volume of water, the acre-foot, defined as the volume of water that will cover 1 acre of land to depth of 1 ft.(feet) A severe thunderstorm dumped 2.0in. (inches) of rain in 30 minutes on a town of area 26 km2 (...
*August 21, 2010*

**Algebra 2 **

I need help finding the vertex of the parabola y=x^2-3x-21
*August 19, 2010*

**math**

A rectangular Persian carpet has a perimeter of 240 inches. The length of the carpet is 30 inches more than the width. What are the dimensions of the carpet? Use P = 2L + 2W.
*August 17, 2010*

**Algebra**

The second angle of a triangle is 3 times as large as the first. The third angle is 55° more than the first. Find the measure of the smallest angle
*August 17, 2010*

**calculus**

Determine whether the graph of the equation is symmetric with respect to the x-axis, y-axis, line y=x, line y=-x, or none of these. x+y=6 Do I have to move the y and 6 to the other side of the equations or does it not matter? Also, if I do, when I test using the equation a^2...
*August 11, 2010*

**medical **

according to a December 4 hospital census of 100 , what are the total inpatient service days for December 5 ?
*August 10, 2010*

**accounting**

The overall (weighted average) cost of capital is composed of a weighted average of : a)The cost of common equity and the cost of debt b)The cost of common equity and the cost of preferred stock c)The cost of preferred stock and the cost of debt d)The cost of common equity, ...
*August 5, 2010*

**physics**

A spring (k=200N/m) is fixed at the top of a frictionless plane inclined at an angle of 40 degrees. A 1 kg block is projected up the plane from an initial position that is distance d=0.60m from the end of the relaxed spring, with an initial kinetic energy of 16J. A) What is ...
*August 1, 2010*

**physics**

A spring (k=200N/m) is fixed at the top of a frictionless plane inclined at an angle of 40 degrees. A 1 kg block is projected up the plane from an initial position that is distance d=0.60m from the end of the relaxed spring, with an initial kinetic energy of 16J. A) What is ...
*July 27, 2010*

**business**

idk?
*July 24, 2010*

**business**

Business relationships often present ethical dilemmas that are ________ 1. not easily resolved 2. easily resolved by following the relevant laws 3.best resolved by creating a lose-lose situation 4.irrelevant and therefore require no action
*July 24, 2010*

**Economics**

A reliable 15-year-old babysitter can be a price maker within her own neighborhood. Suppose that this babysitter wishes to implement a Multipart Pricing Plan. Customers who use her services less than L hours per month will pay a high price of PH dollars per hour. Customers who...
*July 20, 2010*

**english**

Lucia works for a lawyer who depends on her for everything. Answering phones, planning business trips, proofreading documents, and scheduling appointments. Is this sentence grammatically correct
*July 19, 2010*

**physics**

A horse pulls a cart with a force of 40lb at an angle of 30 degrees above the horizontal and moves along at a speed of 6mi/hr. A) how much work does the force do in 10 min? B) What is the average power (in horsepower) of the force?
*July 18, 2010*

**Trigonometric Functions**

This is confusing
*July 15, 2010*

**finance**

Oppenheimer Bank is offering a 30-year mortgage with an EAR of 5 3/8%. If you plan to borrow $150,000, what will your monthly payment be?
*July 12, 2010*

**allied health**

I want to say D. Not sure here Which of the following is true in regard to limited data sets? A. Patients must authorize the use of limited data sets. B. Those who receive limited data sets can pass them on without restrictions. C. Limited data sets can’t include a ...
*July 6, 2010*

**health**

please show examples og week nine final for human services admin.
*June 27, 2010*

**human services admin**

help with week nine final project
*June 27, 2010*

**pre-calculus**

I'm not sure. It was on my math test. I typed it out exactly like it said on the test.
*June 21, 2010*

**pre-calculus**

Prove 3+4+5+...+(n+2) = [n(n+5)]/2 for n>4 Do the first step in a proof by induction.
*June 21, 2010*

**trig**

Write the following equation in standard form and identify the type of conic: 9y^2 - 4x^2 + 8x + 18y + 41 = 0
*June 14, 2010*

**math**

In November, a toy was $40.00. In Dec., the price increased by 80%. In Jan., the price decreased by 80%. What was the price of the toy after it was discounted in January?
*June 13, 2010*

**MATH**

Triangle XYZ below is an isosceles triangle with legs and . and are perpendicular bisectors of triangle XYZ. Find the length of segment if QR = Â½ x and QS = - Â½ x + 4.
*June 4, 2010*

**calculus**

I'm not sure how to find the limit of this problem :S limit as x -> 0+ (cos(x))^(1/x^2)
*May 31, 2010*

**CHEIMISTRY**

A buffer solution is 0.20 M in HPO42- ions and 0.l0 M in H2PO4- ions. What is the H3O+ ion concentration of the solution? The ionization constants for H3PO4 are as follows: Ka1 = 7.5 ´ 10 -3, Ka2 = 6.2 ´ 10-8, Ka3 = 1 ´ 10-12. a. 3.7 ´ 10-3 M b. 3.7 &...
*May 30, 2010*

**chemistry**

What is Ka for 4-aminobenzoic acid if a 0.020 M solution of the acid has a pH of 3.31? a. 2.5 ´ 10-2 b. 2.0 ´ 10-2 c. 4.9 ´ 10-4 d. 1.2 ´ 10-5 e. 2.8 ´ 10-6
*May 30, 2010*

**college**

arranged in a triangle with each building about 500 meters apart. Previously, these buildings were wired with CAT3 UTP running 10BaseT Ethernet. The IT director had mandated that your company will need to use 1000 Mbps Ethernet to the desktop. Define a comprehensive network ...
*May 28, 2010*

**Physics**

A 1.3 X 10^3 kg car traveling with a speed of 2.5 m/s executes a turn with a 7.5 m radius of curvature. Calculate the centripetal acceleration of the car and the centripetal force acting on the car.
*May 24, 2010*

**Physics**

Describe the primary force or forces involved when a car executes a turn. Explain why passengers tend to lean or slide toward the outside of the turn.
*May 24, 2010*

**Physics**

Centripetal force can be calculated from centripetal acceleration by?
*May 24, 2010*

**Physics**

A centripetal force acts
*May 24, 2010*

**Physics**

What term describes a force that causes an object to move in a circular path?
*May 24, 2010*

**Physics**

What is the centripetal acceleration of a skater moving with a tangential speed of 2.0 m/s in a circular path with radius 2.0 m?
*May 24, 2010*

**Physics**

What is the speed of an object in circular motion called?
*May 24, 2010*

**trigonometry**

in triangle abc, angle c is a right angle, AC=8,Bc=15 and AB=17 a.find Sine a b.Find cosine A c.Find Sine B d. Find COsine B E. the measure of angel A f. the measure of angela b Can u tell me the answers and how to do it. Because im in 8th grade
*May 18, 2010*

**trigonometry**

in triangle abc, m<c=90, bc=20, and ba=40. a.find sine a b.find measure of <a
*May 18, 2010*

**triginometry**

thanks
*May 18, 2010*

**triginometry**

In Triangle RST, m<S=90, RS=5, and ST=12. Find Cosine T
*May 18, 2010*

**Physics**

suppose the hammer has a mass of 7.26kg, the wire is 1.00m long, and the force keeping the hammer moving in a circle is 7.43 x 10^3N. what will the hammer's speed be when the thrower releases the wire?
*May 13, 2010*

**Physics**

what is magnitude of the centripetal if the tangential speed of the car is 2.0m/s and the radius of the wheel is 83m
*May 13, 2010*

**Chemistry**

1. c 2. a
*May 13, 2010*

**math**

how to slove (2y+5)(y-3)
*May 12, 2010*

**chemistry**

How many atoms of Ag are in each of the following quantities? 1- 0.38 mole Ag2S? 2- 0.78 mole AgCl?
*May 10, 2010*

**Chemistry**

What is the name of the product when cinnamaldehyde and cyclopentanone undergo aldo condensation?
*May 7, 2010*

**College Chemistry**

Sulfur trioxide is made from the reaction of sulfur dioxide and oxygen. how many grams of SO3 can be made from the reaction of 1.91g SO2 with 1.29g O2? 2 SO2(g) + O2(g)---> 2SO3(g) a) 2.39g b) 3.20g c) 3.23g d) 4.77g e) 6.46g How would i solve this problem?? Im thinking i ...
*May 4, 2010*

**social studies**

what tools did egyptians use to bulid pyramids
*May 3, 2010*

**Chemistry**

What precautions must be taken when you introduce the mixture of compounds to be separated onto the absorbent column
*May 2, 2010*

**College Chemistry**

Thanks, i had my doubts! I was also wondering how i can determine which ionic solid will have the least melting point. Do i look at the intermolecular forces, or do i need to look else where for my answer???
*April 29, 2010*

**College Chemistry**

Does Vapor Pressure decrease as intermolecular forces increase???
*April 29, 2010*

**Math**

You roll a number cube three times. Find P(all odd).
*April 28, 2010*

**College Chemistry**

I see. Well thanks DrBob222. Im starting to understand it a little more.
*April 27, 2010*

**College Chemistry**

BF3 can best be described through the lewis structure as? 1. It has less than an octet on at least one atom. or 2. It has less than an octet of electrons on all toms. I know that it is missing electrons in order to satisfy the octet. And Boron nor fluorine can make double ...
*April 27, 2010*

**Chemistry**

Hi Can someone please help me undersand how to get the answer to this question A 15.0 mL solution of 0.050 mol/L AgNO3 was titrated with 0.0250 mol/L NaBr in the cell SCE || titrated solution | Ag(s) Find the cell voltage for 10.0 mL of titrant added. (a) -0.0312 V (b) 0.194 V...
*April 26, 2010*

**math **

y=3x^2-7
*April 23, 2010*

**calculus**

Solve the equation. 2x - 4 = -10 Find the LCM of 29 and 116. Simplify. 88 · 8-8
*April 22, 2010*

**mat**

2 - x > 17
*April 22, 2010*

**computer programming c++**

c++ program questoin A particular talent competition has 5 judges, each of whom awards a score between 0 and 10 to each performer. Fractional scores, such as 8.3, are allowed. A performer’s final score is determined by dropping the highest and lowest score received, then ...
*April 21, 2010*

**chemistry**

Sulfur trioxide, SO3, is produced in enormous quantities each year for use in the synthesis of sulfuric acid. S(s) + O2(g) -> SO2(g) 2SO2(g) + O2(g) -> 2SO3(g) What volume of O2 (g) at 350 degrees Celsius and a pressure of 5.25 atm is needed to completely convert 5.00g ...
*April 17, 2010*

**4 grade math**

are you seriously in 4th grade and using this website for help? lol i'm a 3rd year college student and i just started to ask for help online
*April 15, 2010*

**math**

a series of numbers starts with 2.each number in the series is two times as great as the number before it.what is the sixth number in the series.
*April 15, 2010*

**US History**

How did the Missouri Compromise cause the North and South to have even stronger feelings of sectionalism in the United States?
*April 14, 2010*

**College Chemistry**

How do acids and bases react?
*April 14, 2010*

**US History**

What was the Gasden Purchase?
*April 14, 2010*

**CRT 205**

I AM HAVING TROUBLE WITH FINAL PROJECT ON GUN CONTROLL
*April 14, 2010*

**organic chemistry**

Lab was: PREPARATION OF A SYNTHETIC PLANT HORMONE
*April 14, 2010*

**PHYSICS PLS HELP**

Internal resistance problem. Suppose that in Figure 3.3, Vo=13V, R1=250kphm, R2=375kohm, and Ri=1.9Mohm. Initially, the voltmeter is disconnected. EXAMPLES: What is the voltage across R2? [Answer: 7.8 V.] What is the voltage across R2 with the meter connected? [Answer: 7....
*April 14, 2010*

**Physics**

With speed 75m/s and period 5.42ms, calculate the wavelength.
*April 9, 2010*

**chemistry**

what is the pressure exerted by a 0.500 mol sample of nitrogen in a 10.0 L container at 20 degrees C?
*April 8, 2010*

**chemistry**

once i have the amount of mols of sucrose present how do i convert that to sucrose? and to kj and grams? lets say i have 0.03110 mols of sucrose
*April 7, 2010*

**chemistry**

if 32kj of energy results in an average weight gain of 1 g of body mass, then how much weight could a person gain after eating 1 cookie. use dimensional analysis mass of 15.21g of a cookie.
*April 7, 2010*

**chemistry**

does not at all say. thats all that is provided. it just sais use dimensional analysis to solve this question. i have a 95% average in this class so far and iam completely puzzled. this is a bonus question on a lab.
*April 7, 2010*

**chemistry**

if 32kj of energy results in an average weight gain of 1 g of body mass, then how much weight could a person gain after eating 1 cookie. mass of 15.21g of a cookie.
*April 7, 2010*