Monday

February 8, 2016
Total # Posts: 266

**physics**

What is the direction of a person that walks 6.0-km North-East, 4.0-km East, and 6.0-km South?
*November 8, 2012*

**math**

the manager of a take out pizza parlor needs to hire pizza makers and cahiers for the evening shift. the total number of employees of both kinds can be at most 16, and the ratio of cashiers to pizza makers must be at least 3 to 5. Also, each pizza maker can answer 12 phone ...
*September 12, 2012*

**Math**

It took Markus half an hour to drive home from work.He averaged 34 miles per hour. How far does Markus live from work?
*September 9, 2012*

**stats**

611
*July 7, 2012*

**Chemistry**

Iron (III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe2O3 are formed when 16.7 g of Fe reacts completely with oxygen? a. 12.0g b. 23.9g c. 47.8g d. 95.6g
*June 21, 2012*

**math**

if 34 baby boys were born in a week and that was 54% how many girls were born in that week
*March 27, 2012*

**math**

Solve for X 0.0421=0.0015-x/0.025+1/2x PLEASE HELP!!!
*March 9, 2012*

**Pre-Algebra**

x=(-9,0) y=(0,-6)
*February 28, 2012*

**Inferential Statictics**

Welsh, Davis, Burke, and Williams (2002) conducted a study to evaluate the effectiveness of a carbohydrate-electrolyte drink on sports performance and endurance. Experienced athletes were given either a carbohydrate-electrolyte drink or a placebo while they were tested on a ...
*February 27, 2012*

**math**

Q=3x^2+4y^2 if x+y=7 what is minimum value for Q. I have absolutely no idea how to solve this problem.
*February 12, 2012*

**chemistry**

if we combust 4.23 x 10^24 molecules of propane how many grams of carbon dioxide and water you will produce ?
*February 7, 2012*

**Chemistry**

What is the concentration of SO3^2- in a 0.043 M solution of Sulfurous acid (H2SO3) in water? The value of Ka1 for H2SO3 is 1.300 x 10-2 and the value of Ka2 is 6.300 x 10-8.
*January 22, 2012*

**Chemistry**

I'm doing online chemistry homework, and the site keeps telling me I have the wrong answer, but I'm not sure what I'm doing wrong. please help? What is the pH of a 0.089M solution of phosphorous acid (H2PHO3) in water? The value of Ka1 for H2PHO3 is 1.600 E-2 and ...
*January 22, 2012*

**Chemistry**

Oops, sorry. I understand now, thank you.
*January 21, 2012*

**Chemistry**

What would the Ka for this be?
*January 21, 2012*

**Chemistry**

A solution that contains 2.047 x 10^-1 M of acid, HA, and 1.808 x 10^-1 M of its conjugate base, A-, has a pH of 4.196. What is the pH after 1.629 x 10^-3 mol NaOH is added to 5.961 x 10^-1 L of this solution?
*January 21, 2012*

**Chemistry**

A chemist is given an unknown base. She finds that a 1.0461 M aqueous solution of this base has a pH of 13.065 at 25oC. What is the value of Kb for this unknown base ?.
*January 17, 2012*

**Chemistry**

How many mL of a solution of NaOH with pH equal to 1.395 x 101 do you need to mix with pure water to obtain 399 mL of a final solution with pH equal to 9.066 ?
*January 17, 2012*

**Chemistry**

What is the pH of a 0.051 M solution of Phosphorous acid (H2PHO3) in water? The value of Ka1 for H2PHO3 is 1.600 x 10-2 and the value of Ka2 is 7.000 x 10-7.
*January 17, 2012*

**Chemistry**

Thank you
*January 17, 2012*

**Chemistry**

What is the [H+] in a 0.98 M solution of formic acid? The Ka of formic acid is 1.8 x 10-4
*January 17, 2012*

**Chemistry**

0.100 M
*January 10, 2012*

**Chemistry**

Consider the titration of 80.0 mL Ba(OH)2 by 0.400 M HCl. Calculate the pH of the resulting solution after the following volumes of HCl have been added. a.) 0.0 mL *Which molecular equation do I use? b.) 20.0mL Ba(OH)2__+2HCl_+=>+_BaCl2_+____2HOH 80.0 mL__20.0mL 0.100M___0....
*January 10, 2012*

**Chemistry**

What is the balanced equation for Ba(OH)2 + HCl?
*January 10, 2012*

**Chemistry**

The reaction describing the formation of ozone from oxygen is shown below. 3 O2(g) <--> 2 O3(g) Calculate Grxn at 288 K for this reaction in a flask where [O2] = 3.419 x 10-2 M and [O3] = 5.783 x 10-4 M. Assume G° = 326 kJ. Use molarity to construct the reaction ...
*January 2, 2012*

**Chemistry**

For the reaction: 2 NO(g) + 1 O2(g) <--> 2 NO2(g) Calculate K, the equilibrium constant, from thermodynamic data at 281 K. (Hint #1: Assume that S and H do not change with temperature.) (Hint #2: Work in J/mol)
*January 2, 2012*

**Chemistry**

Find delta G knot for the following reaction: 2Ch3OH(l) + 3O2(g) --> 2CO2(g) + 4H2O(g)
*January 2, 2012*

**Chemistry**

For the reaction below 2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(g) calculate Srxn at 298 K. (Hint: Use a table of thermodynamic data commonly found at the back of chemistry textbooks.)
*January 1, 2012*

**Chemistry**

Thank you Dr. Bob.
*December 9, 2011*

**Chemistry**

A researcher is studying the decomposition of A as shown by the general reaction below: 2 A(g) 4 B(g) + 2 C(g) Initially, the scientist fills an evacuated 1.772 L flask with 3.710 x 10-1 moles of species A. Upon equilibrium, it is determined that the concentration of A is 4....
*December 9, 2011*

**Chemistry (Equilibrium)**

Oh! Thank you :)
*December 9, 2011*

**Chemistry (Equilibrium)**

Given the reaction below 2NOBr(g) <==> 2NO(g) + Br2(g) and the value of Kc = 1.98, at a temperature of 480 K what is the value of Kp ? (Hint: Use the value of R in the appropriate units.) I used the equation Kp=Kc(RT)^Delta N Then plugged in to get Kp=1.98(.0821x480k)^-1...
*December 9, 2011*

**Calculus**

Find the RMS value of the function i=15[1-e^(-1/2t)] from t=0 to t=4 A. 7.5[sqrt(1+4e^-2 -e^-4)] B. 7.5[sqrt(4-2e^-2 +e^-4)] C. 7.5[sqrt(4+4e^-2 -e^-4)] D. 7.5[sqrt(5-2e^-2 +e^-4)]
*November 28, 2011*

**Psychology**

If psychological needs have presumptive brain or physiological correlates, are they still psychological needs?
*November 10, 2011*

**4th grade Math**

How can making small groupsh help youe estimate large numbers?
*September 28, 2011*

**psychology**

Name one to three important theorists associated with biological psychology.
*September 26, 2011*

**Chemistry - HELP PLEASE**

Please help
*September 25, 2011*

**Chemistry**

Calculate Delta G for H2O(g) + 1/2 O2(g) <-> H2O2(g) at 600. K using the following data: H2(g) + O2(g) <-> H2O2(g) k = 2.3 X 10^6 at 600. K 2H2(g) + O2(g) <-> 2H2O(g) k = 1.8 X 10^37 at 600. K
*September 25, 2011*

**Chemistry**

How do I find the equilibrium constant for 4NH3(g) + 5O2(g) --> 4NO(g) + 6H2O(g) at 825 degrees celcius, assuming that delta H and delta S knot do not depend on temperature, and Delta H is -908 KJ and Delta S is 1206 KJ?
*September 25, 2011*

**Chemistry**

Calculate Delte G Knot for H20(g) + 1/2 O2 <-> H2O2(g) at 600. K, using the following data: H2(g) + O2(g) <-> H2O2 (g) K = 2.3 X 10^6 at 600. K 2H2(g) + O2(g) <-> 2H20(g) K= 1.8 X 10^37 at 600. K
*September 22, 2011*

**Psychology**

Part F is what i need help on this is due in a few hours please help!! Thanks
*September 19, 2011*

**Psychology**

Please I need help understanding this!!!
*September 19, 2011*

**Psychology**

Four research participants take a test of manual dexterity (high scores mean better dexterity) and an anxiety test (high scores mean more anxiety). The scores are as follows. Person Dexterity Anxiety 1 1 10 2 1 8 3 2 4 4 4 -2 (c) figure the correlation coefficient; (d) figure ...
*September 19, 2011*

**Psychology**

Twenty students randomly assigned to an experimental group receive an instructional program; 30 in a control group do not. After 6 months, both groups are tested on their knowledge. The experimental group has a mean of 38 on the test (with an estimated population standard ...
*September 19, 2011*

**Psychology**

Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking—even if they are not exposed to the usual pattern of sunlight. To test...
*September 19, 2011*

**Physics**

18.615
*September 13, 2011*

**psychology **

A researcher predicts that listening to music while solving math problems will make a particular brain area more active. To test this, a research participant has her brain scanned while listening to music and solving math problems, and the brain area of interest has a ...
*September 12, 2011*

**Trig**

Use linear velocity to find out how many miles per hour Jethro's truck is going. In 15 seconds, Jethro's truck's 24-inch diameter tires rotated 101 times.
*September 4, 2011*

**Chemistry**

Which of the following solutions of strong electrolytes contain the largest number of ions: 100.0 mL of 0.30 M AlCl3, 50.0 mL of 0.60 M MgCl2, 200.0 mL of 0.40 M NaCl?
*August 31, 2011*

**Chemistry**

How do you assign oxidation states for each atom in the following compounds? 1. KMnO4 2. NiO2 3. Na4Fe(OH)6 4. (NH4)2HPO4 5. C6H12O6
*August 23, 2011*

**Chemistry**

Predict and balance the following organic reactions. 1. Ethanol(ethyl alcohol) and methanoic acid(formic acid) are mixed and warmed. 2. Ethanoic acid is combined with propanol.
*August 19, 2011*

**english**

no error
*June 15, 2011*

**Chemistry**

Solved, Nevermind.
*June 14, 2011*

**Chemistry**

Part 1: Each molecule of NO2, nitrogen dioxide, consists of 1 atom of N and 2 atoms of O. If you have 0.155 g. of NO2, how many molecules of NO2 do you have ? 0.155gx46.0 = moles moles x 6.02 E23 = answer Part 1 Answer: 2030000000000000000000 Part 2: How many atoms of N do you...
*June 14, 2011*

**chem 1151**

20.0% acetone 18.0% Ethyl Alcohol 62.0% water You take the mL you're trying to find divided by the whole solution, then multiply by 100. For example, you have 50.0mL/250.0mL = 0.20 Take 0.20 x 100 and it will give you the percent.
*June 14, 2011*

**Chemistry**

I found this answer, thank you :)
*June 14, 2011*

**Chemistry**

Part 1: Each molecule of NO2, nitrogen dioxide, consists of 1 atom of N and 2 atoms of O. If you have 0.155 g. of NO2, how many molecules of NO2 do you have ? 2030000000000000000000 was the correct answer Part 2: How many atoms of N do you have ?
*June 14, 2011*

**math**

-4<2x-3<4 add 3 to all sections -1<2x<7 Dive each section by 2 -0.5<x<3.5
*June 14, 2011*

**Chemistry**

Than you can be the one to tell my prof that, sir :)
*June 14, 2011*

**Chemistry**

Our work is online, and I tried to enter it as 2.03E21 and it would not accept it. It only accepts the answer if everything is correct. Thank you :)
*June 14, 2011*

**Chemistry**

Thank you :) 2030000000000000000000 was the correct answer Part 2: How many atoms of N do you have ?
*June 14, 2011*

**Chemistry**

Each molecule of NO2, nitrogen dioxide, consists of 1 atom of N and 2 atoms of O. If you have 0.155 g. of NO2, how many molecules of NO2 do you have ? If you could, please include steps as to how to do the problem. Thank you
*June 14, 2011*

**Alegbra 1 **

An airplane flies 750 miles due west in 1 1/2 hours and 750 miles due south in 2 hours. What is the average speed of the airplane?
*May 20, 2011*

**Social studies**

Why did people long ago form communities
*May 3, 2011*

**Math**

The area of a photograph is 15 square inches. If the width of the photograph is 3 inches, what is its length?
*April 11, 2011*

**Chemistry**

A titration is performed by adding .600 M KOH to 40.0 mL of .800 M HCl. Calculate the pH before addition of any KOH. Calculate the pH after the addition of 5.0 mL of the base. Calculate the volume of base needed to reach the equivalence point. What is the pH at the equivalence...
*April 1, 2011*

**geometry**

elbert wants to plant grass seed in his backyard. His yard is shaped like a rectangle that is 6 meers by 7 meters. He plans to use a cup of seed for every square in his yard. How many cups of grass seed will he need?
*March 30, 2011*

**Geometry**

pa and pb are tangents to circle from point p. chord ab is drawn. find the number of degrees contained in angle pab if angle apb contains a)80 degees b 40 degrees c) 60 degrees d) 90 degrees e) 120 degrees can some1 pllllz explain this 2 me!
*March 2, 2011*

**Math**

Here is a question that I am really stuck on and I need some help!!: In the Unites States, about one person in eight lives in California. To the nearest percent, what percent of people in the Unites States live in California?
*February 15, 2011*

**math **

A vehicle leaves a skid mark of 40 ft before stopping. What has the approximate speed of the vehicle before it stopped? (the formula is speed=.7 times length, then find the square root times 5.5) Is is 25-35 mph?
*October 26, 2010*

**math - check plz**

She has 2 to the 10th power of fruit flies in each of 2 to the 2nd power. How many fruit flies does she have in all? (answer as power) 2to the 11th power?
*October 25, 2010*

**Science**

How are the nucleus, genetic material, chromosomes, genes, DNA, and base pairs interrelated?
*October 24, 2010*

**Actuarial Math**

Fund A accumulate at 8% effective and fund B accumulates at 10% effective. at the end of 20 years, the total of the two funds is $3000. at the end of 10 years the amount in fund A is half the in Fund B. what is the total of the two funds at the end of 5 years
*October 11, 2010*

**Actuarial Math**

The sum of the accumulated value of 1 at the end of four years at a certain effective rate of interest, and the present value of 1 to be paid at the end of four years at an effective rate of discount numerically equal to I is 2.0098 Find the rate
*October 11, 2010*

**science**

An airplane flies at 200km/hr. What is the velocity?
*October 5, 2010*

**6th grade**

I keep mine on a bookshelf my dad and I built ourselves. I, mine, my, I=pronouns bookshelf, dad=nouns I have to identify all of the nouns, pronouns and adjectives.
*September 21, 2010*

**college chemistry**

Calculate the amount of heat required to heat 80 grams of water from 10 to 53°C. The specific heat capacity for water is 4.184 J/g°C.
*September 7, 2010*

**math**

1. A baseball diamond is actually a square, 90 feet on each side. What is the distance from third base to first base? 2. The equation gives the distance, D, in miles that a person can see to the horizon from a height, h, in feet. a) Solve this equation for h b) Mammoth ...
*September 4, 2010*

**math**

1. A baseball diamond is actually a square, 90 feet on each side. What is the distance from third base to first base? 2. The equation gives the distance, D, in miles that a person can see to the horizon from a height, h, in feet. a) Solve this equation for h b) Mammoth ...
*August 30, 2010*

**6th grade English**

His special style and powerful performance have long drawn fans to Kenney's music. Would the subject be style and performance and the verb have drawn
*August 20, 2010*

**math**

the speed of a train a is 6 mph slower than the speed of train b. train a travels 220 miles in the same time it takes train b to travel 250 miles. find the speed of each train
*August 19, 2010*

**math**

i need Help i have no idea how to simplify this expression! x/x+5 + 7x+10/x^2+5x
*June 6, 2010*

**world history**

Is this correct? What was Hong Xiuquan famous for? Answer: He was famous for establishing the Taiping Heavenly Kingdom.
*May 21, 2010*

**World History**

Can you help me with this question What are the boers famous for?
*May 21, 2010*

**science**

why do crickets chirp louder when it is warm. I think it is because they are ectotherms but i really do not know how to explain why. Thanks.
*April 8, 2010*

**math**

Can someone please explain this problem to me: I have to use integrals to find volumes with known cross sections but i just don't understand. I have to do a lot of examples for homework like this so can someone show me so I can do my other problems? Thanks! Consider a ...
*April 7, 2010*

**math**

Can someone please explain this problem to me: I have to use integrals to find volumes with known cross sections but i just don't understand. Thanks! Consider a solid bounded by y=2ln(x) and y=0.9((x-1)^3). If cross sections taken perpendicular to the x-axis are isosceles ...
*April 6, 2010*

**math**

Can someone please explain this problem to me: I have to use integrals to find volumes with known cross sections but i just don't understand. Thanks! Consider a solid bounded by y=2ln(x) and y=0.9((x-1)^3). If cross sections taken perpendicular to the x-axis are isosceles ...
*April 6, 2010*

**science**

A skater is coasting alone the ice without sexerting any apparent force. Which law of motion explains the skater's ability to continue moving?
*March 11, 2010*

**Science**

After a soccer ball is kicked into the air, what force or forces are acting on it?
*March 11, 2010*

**scientific notation**

what is 90,000 in scientific notation
*January 10, 2010*

**MATH**

I have math questions I need to check my answers can you please help me 1. 4x4x4x4x4 as a power of 4 answer 4 to the fifth power 2.a bedroom is 10 ft by 11 ft what is the perimeter? answer 42 ft evaluate 72/8-9/3=6 3.Jamal is fencing a rectangular field that measures 25 ft by ...
*September 5, 2009*

**MATH**

please check my answers prime factorization of the number 117 =3x3x13 6/25 divided by 2/15=5/9
*September 5, 2009*

**literature**

Snowy Woods figurative language used.. "To watch his woods fill up with snow." "He gives his harness bells a shake To ask if there is some mistake. The only other sound's the sweep Of easy wind and downy flake." Road not Taken "Because it was ...
*August 21, 2009*

**literature**

No it doesn't look like either poems use figurative language
*August 21, 2009*

**literature**

Robert Frost's "The Road Not Taken" and "Stopping by Woods on a Snowy Evening"....how are both poems similar? besides the theme but rhyme scheme, use of figurative language or irony
*August 21, 2009*

**English Composition**

Ok. How about...: Students should not be discriminated against other students based on their family's social status and income.
*June 25, 2009*

**English Composition**

I'm writing a synthesis paper for my college english composition class. My topic is: The relationship between social class and public education. So far, my thesis: My argument is that students in public education should not be discriminated against based on what social ...
*June 25, 2009*

**7th grade input/output patterns**

Determine if each relationship represents a function ×|2|5|8|3| Y|4|5|6|7|
*April 17, 2009*

**college**

so it would be Michael has lived in Portland, Oregon; San Francisco, California; and Providence, Rhode Island.
*April 13, 2009*