Wednesday

July 27, 2016
Total # Posts: 1,525

**Chemistry**

Calculate the molar solubility of BaSO4 in a solution in which [H3O+] is 2.5 M. I can almost solve this on my own. If you know the following equations: BaSO4 = Ba2+ + SO42- SO42- + H+ = HSO4- HSO4- + H+ = H2SO4 and I know [H+] = 2.5 M along with the following equation: [Ba2...
*October 25, 2010*

**physiscs**

mass of 0.2 kg is attached to a spring of negligible mass. I the mass executes simple harmonic motion with a period of 0.5 s, what will be the spring constant/ Can I use the following formula to solve this problem k = (4pi square x mass) / T square
*October 24, 2010*

**Chemistry**

A mass of 0.2 kg is attached to a spring of negligible mass. I the mass executes simple harmonic motion with a period of 0.5 s, what will be the spring constant/ Can I use the following formula to solve this problem k = (4pi square x mass) / T square
*October 24, 2010*

**chemisty**

what will be the mass of angydrous Alum left over if one starts with 100.00 g of hydrated Alum? please can you explain what fraction do I need to use. Based on the given information I can find the %theoretical of water in angydrous Alum. But I still don't understand how to...
*October 21, 2010*

**chemistry**

what will be the mass of angydrous Alum left over if one starts with 100.00 g of hydrated Alum?
*October 21, 2010*

**English grammar**

In the question "Where are the spoons?", what is "where"? adverb? preposition? please explain why
*October 20, 2010*

**college Geol 101**

Suppose you have a sample of clamshell at a Paleoindian site and you measure the 14C activity of a 100-gram sample of carbon as 320 disintegrations per minute (or 3.2 disintegrations per gram of carbon per minute). a.What was the activity (in disintegrations per minute) for ...
*October 20, 2010*

**algebra**

An executive invests $25,000, some at 8% and some at 4% annual interest. If he receives an annual return of $1600, how much is invested at each rate?
*October 14, 2010*

**Calculus III**

Give an Example where f(x) is greater than or equal to 0 but f(x) is not decreasing and the integral converges while the series diverges or vice versa.
*October 12, 2010*

**chemistry**

a stone ax head was dug up at an arcchaeological site. it was estimated to be about 3,200 years old. is it possible that its age could be determined using carbon- 14?
*October 12, 2010*

**Calculus**

Give an Example where f(x) is greater than or equal to 0 but f(x) is not decreasing and the integral converges while the series diverges or vice versa.
*October 12, 2010*

**physics**

what kind of information is indicted by a graph of the acceleration due to gravity versus ball's mass if the slope of the curve is zero?
*October 11, 2010*

**math 157**

at the first tri city meeting where 8 people are from twon A 7 people are from town B and 5 people are from town C. If the council consists of 5 people find the probability that 3 people are from town A and 2 people are from town B. How do i do this
*October 10, 2010*

**math 157**

at the first tri city meeting where 8 people are from twon A 7 people are from town B and 5 people are from town C. If the council consists of 5 people find the probability that 3 people are from town A and 2 people are from town B. How do i do this
*October 10, 2010*

**chemistry**

Which of the following is NOT true of colligative properties? Colligative properties are... A. responsible for lowering the vapor pressure of a solution versus the vapor pressure of the pure solvent. B. independent of the chemical identity of the solute. C. dependent on the ...
*October 4, 2010*

**Physics**

A cart has a constant acceleration of a = 2m/s2. At a certain instant its speed is 5 m/s. What is its speed 2 s later and 2 s earlier?. What is its average speed during the time interval of 4s.?
*October 3, 2010*

**computer history**

When was the first computer created, and by whom?
*September 27, 2010*

**algebra**

The percent of increase is 16%. The new number is 522. What was the original number?
*September 27, 2010*

**Science**

What experiment did Rudolph Virchow do to discover that cells come from cells?
*September 25, 2010*

**Science**

What experiment did Matthias Schleiden do? What prior information did he use to help him with his research/discovery? What tools did he need to complete his experiment?
*September 21, 2010*

**Science **

What experiment did Rudolph Virchow do? What prior information did he use to help him with his research/discovery? What tools did he need to complete his experiment?
*September 21, 2010*

**physiscs**

For other viewers who didn't understand like Ray.. Since its not oscillating there is no period, therefore it is 0.
*September 21, 2010*

**physics**

One of the fastest recorded pitches in major-league baseball, thrown by Billy Wagner in 2003, was clocked at 101.0 mi/h. If a pitch were thrown horizontally with this velocity, how far would the ball fall vertically by the time it reached home plate, 60.5 ft away? ___ft
*September 21, 2010*

**physics**

The best leaper in the animal kingdom is the puma, which can jump to a height of 11.5 ft when leaving the ground at an angle of 52°. With what speed, in SI units, must the animal leave the ground to reach that height? ___m/s
*September 21, 2010*

**word search puzzle**

moving about in a clumsy, noisy way
*September 20, 2010*

**calculus**

Im sorry ... it is a derivative question... it says to use the power rule
*September 18, 2010*

**calculus**

x = 6 h(x) = (x-1/2 + 5x)(1 - x-1)
*September 18, 2010*

**English**

i really dont care learning about paul revere i just want the answer to my question so i wont have to let my partner down.
*September 16, 2010*

**English**

it would be alot easier if you did do it for me
*September 16, 2010*

**English**

i dont need no biographies i need a list of contributions because i dont understand the question
*September 16, 2010*

**English**

Paul Revere, what are some major contributions that he did for the government
*September 16, 2010*

**Math Problems**

Dave receives $5.80 per hour and 3% commission on sales. One week he worked 35 hours and sold $2,218 worth of goods. How much did he earn that week?
*September 16, 2010*

**Math **

thks
*September 14, 2010*

**Math **

What is the average births per day if the average birth per second is 4 1/5? What is the average deaths per hour if the average death per second is 1.7?
*September 14, 2010*

**math**

The meter reading on January 17 was 7952 CCF. The meter reading on February 17 was 8103 CCF. How many units of gas were used?
*September 14, 2010*

**design**

rewrite them using performance objectives/ 1. Understand how a car works 2. Know how to write a term paper using APA format 3. Comprehend the differences between mammals and reptiles 4. Know how to write a performance objective 5. Use JavaScript effectively on a Web page 6. ...
*September 3, 2010*

**accounting help please?!**

Nancy Sly wishes to sell her business and receives the following three offers:? 1. $568,000 cash immediately. 2. $200,000 cash now plus an annual installment of $60,000 at the end of each year for 10 years, a total of $800,000. 3. An offer to manage the property for 10 years ...
*September 2, 2010*

**accounting help please?!**

Nancy Sly wishes to sell her business and receives the following three offers:? 1. $568,000 cash immediately. 2. $200,000 cash now plus an annual installment of $60,000 at the end of each year for 10 years, a total of $800,000. 3. An offer to manage the property for 10 years ...
*September 2, 2010*

**english check answer**

its fine you dont actually help
*August 28, 2010*

**english check answer**

1) wary 2) inclination 3) dilemma 4) Sabotage 5) Retort 6) zeal 7) 8) demoralize 9) Irrate 10) Subsequent words Curt, Demoralize, dilemma,inclination, irate, retort, sabotage, subsequent, wary,zeal if my carpets need cleaning or i want a new cellphone plan. I will do some ...
*August 28, 2010*

**english vocab**

__________ 1-2 Already angry,the customer became more ___ when he __________ received only this __ response: No return. _______ 3-4 when I answer my phone and hear someone demand, "who is this?" _______ my _ is _ to "I'm the person whose phone was ringing. ...
*August 28, 2010*

**chemistry**

4.4g/cm3
*August 27, 2010*

**algebra**

Order from least to greatest: 1/3, 1/6, 1/4. Is it 1/3. 1/4, 1/6?
*August 5, 2010*

**chemistry**

A solution contains naphthalene(C10H8) dissolved in hexane (C6H14) at a concentration of 14.52 % naphthalene by mass.Calculate the vapor pressure at 25 degrees C of hexane above the solution. The vapor pressure of pure hexane at 25 degrees C is 151 .
*August 5, 2010*

**Chemistry**

To what volume should you dilute 124 mL of an 8.10 M CuCl2 solution so that 52.0 mL of the diluted solution contains 5.9 g CuCl2
*August 4, 2010*

**Chemistry**

How much heat (in kJ) is evolved in converting 1.00 mol of steam at 145.0 degrees C to ice at -45.0 degrees C? The heat capacity of steam is 2.01 J/g* degrees C and of ice is 2.09 J/g*degrees C .
*August 4, 2010*

**college**

1. Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. b. The graph of a normal distribution is bell-shaped. c. If a population has a normal distribution, the mean and the median are not equal. d. The graph of a ...
*August 1, 2010*

**BIOLOGY**

thanks but i AM aware of the seaching techniques i was just unsure of some stuffs i'll assume you dont have the answers to my questions thanks anyways
*August 1, 2010*

**BIOLOGY**

True of false: 1. The Bohr effect explains the manner in which pH changes the binding affinity of hemoglobin for O2. i think this is true 2. Hemoglobin binding affinity increases as Po2 increases. im not sure about this 3. O2 will passively diffuse and bind with hemoglobin ...
*August 1, 2010*

**substance**

a page of a textbook is 7 1/2 wide. the pages are divided into three equal columns with 3/8 in between how wide is each column
*July 31, 2010*

**diffrential equations**

Find two linearly independent power series solutions to the diffrential equation. State the first 3 therms of each series: 2x^2y''+xy'-(1+2x^2)y=0
*July 28, 2010*

**Statistics**

3. Indicate whether the given statement could apply to a data set consisting of 1,000 values that are all different. a. The 29th percentile is greater than the 30th percentile. b. The median is greater than the first quartile. c. The third quartile is greater than the first ...
*July 25, 2010*

**Statistics**

What is the stardard deviation using the rull of thumb for each set of numbers: 57,61,57,57,58,57,61 61,52,69,64,46,554,47
*July 25, 2010*

**PHYSICS**

Original Q: If you pour liquid into a tall, narrow glass, you may hear sound with a steadily rising pitch. What is the source of the sound? And why does the pitch rise as the glass fills? Additional question from me: What does it mean by the source of the sound? like the ...
*July 20, 2010*

**Chemistry (WebWorks)**

Def correct: iii ii v v vii viii
*July 19, 2010*

**geometry**

what is the area of a rhombus if AB equals 9.9 and AC equals 13 and DB equals 15?
*July 19, 2010*

**College Physics.**

really?? but how would i find L?
*July 18, 2010*

**College Physics.**

A pendulum has a period of 1.8 s. a) Its mass is doubled. What is its period now? b) Its length is doubled. What is its period now? The original pendulum is taken to a planet where g = 16 m/s2. c) What is its period on that planet?
*July 18, 2010*

**College Physics 121**

A spring with a spring constant k = 50N/m has an unstretched length of 20cm. Find the work required to stretch the spring to a length of 30 cm. W = J ?? any help guys?
*July 18, 2010*

**physics hw need help**

A disk with a radial line painted on it is mounted on an axle perpendicular to it and running through its center. It is initially at rest, with the line at q0 = -90°. The disk then undergoes constant angular acceleration. After accelerating for 3.1 s, the reference line ...
*July 14, 2010*

**Physics 121 HW**

A sign has a mass of 1050 kg, a height h = 1 m, and a width W = 4 m. It is held by a light rod of length 5 m that is perpendicular to a rough wall. A guy wire at 23° to the horizontal holds the sign to the wall. Note that the distance from the left edge of the sign to the ...
*July 14, 2010*

**physics 121 hanging sign**

do i need to do the x,y for the rod?
*July 14, 2010*

**physics 121 hanging sign**

how would i find that? divide the mass by the weight of the wire?
*July 14, 2010*

**physics 121 hanging sign**

i got .227 but its the wrong answer?
*July 14, 2010*

**physics 121 hanging sign**

A sign has a mass of 1050 kg, a height h = 1 m, and a width W = 4 m. It is held by a light rod of length 5 m that is perpendicular to a rough wall. A guy wire at 23° to the horizontal holds the sign to the wall. Note that the distance from the left edge of the sign to the ...
*July 14, 2010*

**Physics 121 **

how do i find the hight for b?
*July 14, 2010*

**Physics 121 **

A solid sphere of uniform density starts from rest and rolls without slipping a distance of d = 2.7 m down a q = 23° incline. The sphere has a mass M = 4.8 kg and a radius R = 0.28 m. a) Of the total kinetic energy of the sphere, what fraction is translational? KEtran/...
*July 14, 2010*

**finance**

Your best taxable investment opportunity has an EAR of 4%. Your best tax-free investment opportunity has an EAR of 3%. If your tax rate is 30%, which opportunity provides the higher after-tax interest rate?
*July 14, 2010*

**Chemistry**

Haloacetic acids are the most acidic when the molecule is A. stable B. unstable dihedral angle is A. intermediate B. 0 C. 180 conformation is A. SYN B. ANTI C. neither
*July 12, 2010*

**alg**

$3.79
*July 12, 2010*

**BIOLOGY**

In general, the frequency of APs in an afferent neuron is related to the amplitude of the receptor potential in the following way: a. exponentially. b. there is no general relationship. c. logarithmically. d. linearly. thx
*July 12, 2010*

**math**

what is the probability of selecting an eight followed by a nine from a deck of 52 cards if the first card is replaced before second is drawn? please help me.
*July 11, 2010*

**math**

A scientist wants to combine two metal alloys into 20 kg of a third alloy which is 60% aluminum. He plans to use one alloy with 45% aluminum content, and a second alloy with 70% aluminum content. How many kilograms of each alloy must be combined?
*July 5, 2010*

**Physics**

hey, thanks a lot.
*June 30, 2010*

**Physics**

Two vectors A. and B have magnitude A = 3.00 and B = 3.00. Their vector product is A x B= -5.00k + 2.00i. What is the angle between A and B?
*June 30, 2010*

**chemistry**

The pH of a solution is measured to be 5.4. Calculate the following: a) [H3O^+] b)pOH c)[OH^-]
*June 28, 2010*

**chemistry**

Calculate the pH of the solution made by dissolving 8.00 g of lactic acid.
*June 22, 2010*

**organic chem**

extraction lab: suppose that aqueous and organic (diethyl ether) layers were not mixed thouroughly predict the effect that this would have on the results in your answer, consider melting point temperature of benzophenone thx
*June 16, 2010*

**Business**

Which economic system is the best solution to handling a crisis of epic proportion?
*June 16, 2010*

**organic chemistry**

recrystallization question: a student's correctly calculated value for the % recovery of purified unknown solid was 102%. assume that the student performed all steps of procedure correctly. a) comment on the validity of the result (include reasons). b) suggest possible ...
*June 14, 2010*

**math**

how to make a tally chart for the number of students in the third, fourth and fifth grade classes 26,25,27,27,26,28,27
*June 10, 2010*

**child growth development**

Researchers have concluded that A. the proportion of REM sleep to N-REM sleep is similar in infants and adults B. REM sleep provides needed brain stimulation to neonates C. REM sleep is mostly absent in neonates D. the proportion of REM sleep to N-REM sleep increases as a ...
*June 10, 2010*

**economics**

what preceding example?
*June 6, 2010*

**algebra**

can you show me how to log 36=x
*June 6, 2010*

**chemistry; kinetics**

wrong 8.0x10-4
*May 29, 2010*

**economics**

If the price level increases, other things constant, consumption spending
*May 23, 2010*

**chemistry**

A is the correct answer I just tried it right now.
*May 16, 2010*

**chemistry(check my answer)**

its kf,kr, the value of forward rate and reverse rate.
*May 14, 2010*

**Geometry**

How do you fine the perimeter of a parallelgram with the following data known: Top = x+3 LSide = x+3 RSide = 17
*May 8, 2010*

**British Lit----URGENT**

i think it is supernatural if it is not please tell us the right answer:)
*May 8, 2010*

**PHYSICS**

Three small spheres are placed at fixed points along the x-axis, whose positive direction points towards the right. Sphere A is at x = 23.0 cm, with a charge of -10.00 microCoulomb Sphere B is at x = 55.0 cm, with a charge of 2.00 microCoulomb Sphere C is at x = 57.0 cm, with ...
*May 4, 2010*

**PHYSICS**

sorry it was suppose to read with a charge of -10 microCoulombs for sphere A, 2 microCoulombs for sphere B and -9 microCoulombs for sphere C.
*May 3, 2010*

**PHYSICS**

Three small spheres are placed at fixed points along the x-axis, whose positive direction points towards the right. Sphere A is at x = 23.0 cm, with a charge of -10.00 ìC. Sphere B is at x = 55.0 cm, with a charge of 2.00 ìC. Sphere C is at x = 57.0 cm, with a ...
*May 3, 2010*

**Accounting**

What conclusions can be drawn about the frequency of compounding interest? What conclusions can be drawn about the length of time an amount is compounding?
*April 23, 2010*

**Chemistry**

What is the product of a grignard reaction of bromotoluene and co2 as starting materials?
*April 20, 2010*

**Math**

find the vertex of (x+1)^2-2
*April 15, 2010*

**Chemistry**

the student stopped the first careful titration when a deep pink color was obtained in the flask. On the second trial, the student stopped when a light pink color was obtained. On the third trial, the pink color obtained was very faint and noticeable only when the flask was ...
*April 13, 2010*

**Calculus**

show the following linearization of the function f(x)=cos(3x)-3sin(3x) at x=2pi
*April 7, 2010*

**Calculus**

find second derivative of f(t)=inverse cos(4t)
*April 7, 2010*

**Goverment**

in which system of government does the central authority hold all power?
*April 7, 2010*