Tuesday

June 30, 2015

June 30, 2015

Total # Posts: 6,732

**Linear Algebra**

Prove that If a vector space is of dimension n and a set of vectors spans V, then that set of vectors must be linearly independent.
*February 26, 2013*

**Chemistry**

How many moles of NaOH are in 13.2 mL of 3.00 M NaOH?
*February 26, 2013*

**PLEASE COULD SOMEONE HELP ME OUT Physics**

Thank you Elena your a life saver :)
*February 25, 2013*

**PLEASE COULD SOMEONE HELP ME OUT Physics**

Two long straight aluminum wires, each of diameter 0.30mm, carry the same current but in opposite directions. They are suspended by 0.50m long strings...If the suspension strings make an angle of 3.0 degree with the vertical, what is the current in the wires? Thank you......
*February 25, 2013*

**Math**

B)The two ranges are close together, so there are probably no outliers in this set.-John McMuffin Sources: (Many calculators :D)
*February 25, 2013*

**PLEASE COULD SOMEONE HELP ME OUT Physics**

Hi Elena thank you, but this is what I did and i got it wrong sqrt(2π*5.23x10^-2*2700*π*2.25x10^-6*9.8/4*4π*10^-7)= 1.38x10^-4 but it is wrong what did i do wrong aluminum density is 2700 kg/m^3 and 2.25x10^-6 is .30 mm divided by 100 to get meters an then ...
*February 25, 2013*

**PLEASE COULD SOMEONE HELP ME OUT**

Two long straight aluminum wires, each of diameter 0.30mm, carry the same current but in opposite directions. They are suspended by 0.50m long strings...If the suspension strings make an angle of 3.0 degree with the vertical, what is the current in the wires? Thank you......
*February 25, 2013*

**port charlotte high**

2Nacl +2HCL = 2NaCl + H2 what mass of sodium is required to react with 8.45g of HCl
*February 25, 2013*

**Physics please help**

Two long straight aluminum wires, each of diameter 0.30mm, carry the same current but in opposite directions. They are suspended by 0.50m long strings...If the suspension strings make an angle of 3.0 degree with the vertical, what is the current in the wires? please help out I...
*February 25, 2013*

**physics**

When two billiard balls of equal mass collide obliquely, the balls will always separate at what angle?
*February 25, 2013*

**Physics please help**

Two long straight aluminum wires, each of diameter 0.30mm, carry the same current but in opposite directions. They are suspended by 0.50m long strings...If the suspension strings make an angle of 3.0 degree with the vertical, what is the current in the wires? please help out I...
*February 25, 2013*

**language arts**

Idk
*February 23, 2013*

**Science**

density = mass/volume = 21.6/8 = 2.7g/cm^3
*February 23, 2013*

**Chemistry**

A compound which can donate 2 protons is termed dibasic acid. What is the name given to a compound which can accept 2 protons?
*February 23, 2013*

**algebra 1**

thr ratio of two integers is 6:13 the smaller interger is 54. find the larger interger
*February 21, 2013*

**biomechanics**

need help
*February 21, 2013*

**Chem Will somebody Please help me**

The Lab experiment we did today was to analyze an antacid tablets to determine the actual content of NaHCO3. Suppose I dropped the tablets into the beaker and some of the reaction mixture splashed out. Would my final calculated mass of sodium bicarbonate in the tablet be ...
*February 20, 2013*

**science**

A car traveling along the highway needs a certain amount of force exerted on it to stop. More stopping force may be required when the car has:
*February 20, 2013*

**physics**

the force required to maintain an object at a constant velocity in free space is eaqual to?
*February 20, 2013*

**Chemistry help**

The Lab experiment we did today was to analyze an antacid tablets to determine the actual content of NaHCO3. Suppose I dropped the tablets into the beaker and some of the reaction mixture splashed out. Would my final calculated mass of sodium bicarbonate in the tablet be ...
*February 20, 2013*

**physics**

An airplane is flying at a constant velocity parallel to the horizontal, and the pilot drops a flare. Assuming that the plane does not change course, where will the plane be relative to the flare when the flare hits the ground?
*February 20, 2013*

**Biology**

Please Help Quick,Write The Balanced Chemical Equation For Respiration In An Athlete In A Race.
*February 20, 2013*

**Biology**

Please Help Quick,Write The Balanced Chemical Equation For Respiration In Plants.
*February 20, 2013*

**Biology**

Please Help Quick,Under Anaerobic Condition,Explain What Happens To Glucose In Yeast And In Humans?
*February 20, 2013*

**Physics**

Rapids in rivers occur when the river narrows. Consider a simple river where the cross-section can be modeled as a rectangle 60 m wide and 2 m deep. If the speed of the river water at this point is 1 m/s, what would be the speed of the water in m/s at a point further down ...
*February 20, 2013*

**Please Help Me**

Use the equation for the synthesis of hydrogen to answer the following. C (s) + H2O (l) -> CO (g) + H2 (g) deltaH = + 31.3 kcal/mol carbon deltaS = +32 cal/(mol•K) Calculate the energy change (deltaH) when 5.00 g of carbon is consumed. Calculate the energy change (...
*February 19, 2013*

**math **

In third grade... Write an equation comparing test scores of 88 and 97. (Use a box for missing number) do you know how to answer this?
*February 19, 2013*

**math **

In third grade... Write an equation comparing test scores of 88 and 97. (Use a box for missing number) do you know how to answer this?
*February 19, 2013*

**Chemistry**

Use the equation for the synthesis of hydrogen to answer the following. 10 points. C (s) + H2O (l) -> CO (g) + H2 (g) deltaH = + 31.3 kcal/mol carbon deltaS = +32 cal/(mol•K) Calculate the energy change (deltaH) when 5.00 g of carbon is consumed. Calculate the energy ...
*February 19, 2013*

**chemistry**

assume the true concentration of the acetic acid solution is .175M and calculate the percent relative error in your measurement?
*February 19, 2013*

**Maths**

R=square root of u squared plus v squared divided by m and u and v are positive.Find u when r=3,v=6 and m=5
*February 19, 2013*

**Maths**

R=square root of u squared plus v squared divided by m and u and v are positive.Find u when r=3,v=6 and m=5
*February 19, 2013*

**Math**

Find the sum of all primes a<1000, such that a^k +1 = b^{m+1} for some positive integers k,b,m.
*February 19, 2013*

**Math**

Let S(n) denote the sum of digits of the integer n. Over all positive integers, the minimum and maximum values of S(n)/S(5n) are X and Y, respectively. The value of X+Y can be written as a/b , where a and b are coprime positive integers. What is the value of a+b?
*February 19, 2013*

**Math**

John is building a fence that is 6 feet high and 18 feet wide to put around his garden. He has two sizes of boards that he can use. One is 2 feet by 6 feet and the other is 4 feet by 6 feet. John can put the boards either horizontally or vertically and he has lots of boards of...
*February 19, 2013*

**Maths**

Siuan's grandmother recently signed up for a twitter account. She only follows five people - her five grandchildren. Each day, each of her grandchildren make two tweets and at the end of the day Siuan's grandmother gets an e-mail that lists all ten tweets in ...
*February 19, 2013*

**Math**

Killer robots are trying to take over the world. They know the password to the doomsday weapon is 5 digits long and contains either 0 or 1, and either 2 or 3, and either 4 or 5, and either 6 or 7, and either 8 or 9. If the robots can enter 5 passwords per second, how long (in ...
*February 19, 2013*

**math**

"The area of a rectangle is 360m2. If its lengh if increased by 10m and its width is decreased by 6m, then its area does not change. Find the perimeter of the original rectangle." I need to use the "guess and test" or the "draw a diagram" method ...
*February 18, 2013*

**Physics**

The Royal Gorge bridge over the Arkansas River is 310.0 m above the river. A 59.0-kg bungee jumper has an elastic cord with an unstressed length of 62.0 m attached to her feet. Assume that, like an ideal spring, the cord is massless and provides a linear restoring force when ...
*February 17, 2013*

**Chemistry**

You use 2.80 g of NaHCO3, and determined that 2.83 g of carbon dioxide ar produced. Convert the mass of NaHCO3 to moles: Convert the mass of CO2 to moles:
*February 16, 2013*

**Chemistry**

Some of your reaction mixture splashed out of the beaker when you dropped the tablets into the acetic acid. How would this affect your measurements? Woud your final calculated mass of sodium bicarbonate in the tablet be artificially high or low as a result of this splashing?
*February 16, 2013*

**dilution please help**

How to use serial dilution to dilute a stock solution at 15000 fold dilution?
*February 16, 2013*

**Dilution**

Please, if possible, check if my method of dilution is correct Problem: Given a very concentrated liquid PBS, dilute it to 1:15,000 My approach is to use serial dilution First: dilute it 15x (50ul of PBS + 750ul of water)... this will give 1:15 Second: dilute 10xfold more (...
*February 15, 2013*

**jones**

I have a unscramble analogies worksheet that I can't answer. Here are the analogies: ________:judical branch [eempusr ructo] radius:______[meeairtd] brass instruments:_____[stoaercrh] _______:poem[anzsat] _______:pants[bowaerrd] thank yo
*February 14, 2013*

**Chemistry**

A solvent has a molar mass of 37.2 g/mol and a normal boiling point of 111.2 oC. The boiling point elevation constant, K b , for this solvent is 1.58 oC/m. If 18.7 g of a nonelectrolyte having a molar mass of 20.5 g/mol are mixed with 170.0 g of the solvent, what is the ...
*February 14, 2013*

**College**

A bod of 10kg is traveling in straight line at 10m/s (a)what is de momentum?(b)what is de average force required to increase its velocity 4rom zero to 20m/s in 4seconds?
*February 13, 2013*

**Physics**

During an action potential, Na^+ ions move into the cell at a rate of about 3x10^-7 mol/m^2*s. How much power must be produced by the "active Na^+ pumping" system to produce this flow against a +30-mV potential difference? Assume that the axon is 40cm long and 30um ...
*February 12, 2013*

**Pre cal**

From a point A is 8.20 meters above level ground,the angle of elevation of the top of a building is 31degrees 20 min and the angle of depression of the base of the building is 12degree 50 min. Approximate the heighth of the building
*February 11, 2013*

**Chemistry**

Naphthalene combustion can be used to calibrate the heat capacity of a bomb calorimeter. The heat of combustion of naphthalene is -40.1 kJ/g. When 0.8210 g of naphthalene was burned in a calorimeter containing 1,000. g of water, a temperature rise of 4.21Ã‚Â&...
*February 11, 2013*

**Math**

two sides of a triangle have the ratio of 3:4. The hypotenuse is 20. What are the measures of the two other sides?
*February 11, 2013*

**Physics**

A dropping ball initial at rest is dropped 1.5m; calculate a) the traveling time of the ball and b) its velocity just before reaching the ground.
*February 10, 2013*

**probability**

John has 3 unique coins such that the probability of obtaining a head when the coin is flipped is 1/10, 2/10 and 3/10, respectively. If he flips each of the 3 coins once, the probability that at least 1 heads appears is p. What is the value of 1000p?
*February 10, 2013*

**probability**

John has 3 unique coins such that the probability of obtaining a head when the coin is flipped is 110, 210 and 310, respectively. If he flips each of the 3 coins once, the probability that at least 1 heads appears is p. What is the value of 1000p?
*February 10, 2013*

**Physics please help**

During an action potential, Na^+ ions move into the cell at a rate of about 3x10^-7 mol/m^2*s. How much power must be produced by the "active Na^+ pumping" system to produce this flow against a +30-mV potential difference? Assume that the axon is 40cm long and 30um ...
*February 10, 2013*

**Physics please help**

Can you please help out am still stuck one this
*February 10, 2013*

**Physics please help**

During an action potential, Na^+ ions move into the cell at a rate of about 3x10^-7 mol/m^2*s. How much power must be produced by the "active Na^+ pumping" system to produce this flow against a +30-mV potential difference? Assume that the axon is 40cm long and 30um ...
*February 10, 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*

**Pre-calculus **

a) A particular ball always rebounds 3/5 the distance it falls. If the ball is dropped from a height of 5 meters, how far will it travel before coming to a stop? Explain the reasoning. b) Prove that if a1, a2, a3, ... is a geometric sequence,then ln(a1), ln(a2), ln(a3)... is ...
*February 9, 2013*

**Chemistry**

A student mixes 85.1 g of water at 69.6Â°C with 58.1 g of water at 22.0Â°C in an insulated flask. What is the final temperature of the combined water?
*February 9, 2013*

**Algebra**

suppose you invest $1100 at an annual interest rate of 4.3% compounded continuously. How much will you have in the account after 15 years?
*February 8, 2013*

**Limit**

(x2-27)/(x-3) as x tends to 3
*February 6, 2013*

**Statistics**

A telephone company's records indicate that private customers pay on average $17.10 per month for long-distance telephone calls. A random sample of 10 customers' bills during a given month produced a sample mean of $22.10 expended for long-distance calls and a sample ...
*February 5, 2013*

**Statistics**

Which of the following conditions doesn't need to be met before you can use a two-sample procedure? The responses in each group are independent of each other. Each group is considered to be a sample from a distinct population. The same variable is measured in both samples...
*February 5, 2013*

**chemistry help !!!!!!!!!!!!!!!!**

complete the following paragraph relating to the enzyme,b -galactosidase .this enzyme hydrolyses the disaccharide lactose to constituent monosaccharides ,galactose and glucose ,drag and drop the approprite words into the correct space. the enzyme ,B-galactosidase is added to a...
*February 2, 2013*

**chemistry help !!!!!!!!!!!!!!!!**

complete the following paragraph relating to the enzyme,b -galactosidase .this enzyme hydrolyses the disaccharide lactose to constituent monosaccharides ,galactose and glucose ,drag and drop the approprite words into the correct space. the enzyme ,B-galactosidase is added to a...
*February 2, 2013*

**calculus 1**

y-28=(18x-3x2)(x-2)
*January 31, 2013*

**Math!!!**

I have a input output table and I can't figure out the rule here is the chart X. Y _______________ 1. | 3 4. | 7 7. | 11 Can u figure it out I'm having a really hard time with this problem!!!!
*January 30, 2013*

**Physics / Heat Transfer**

How much heat must be removed from a 200 g block of copper to lower its temperature from 302 oF to 68 oF? Specific heat of copper: c = 0.092 kcal/(kg K) a. 2.4 kcal b. 2400 kcal c. 18.4 kcal d. 12 kcal e. 26 kcal
*January 30, 2013*

**MATH**

4[23 - (6 + 4)]
*January 29, 2013*

**MATH**

4[23 - (6 + 4)]
*January 29, 2013*

**ACT/SAT MAP PREP**

- t^5 u^5 v^5/ tuv =????????
*January 29, 2013*

**math**

write the number in words 84,508
*January 29, 2013*

**computer science**

Write a method printBackwards that prints an array of integers in reverse order, in the following format. For the array {1, -3, 4, 7, 2}: element [4] is 2 element [3] is 7 element [2] is 4 element [1] is -3 element [0] is 1
*January 29, 2013*

**5th grade math**

Using input output tables input 3 4 5 6 0 10. Output 9 16 25 36 0 100 what is the input output rule?
*January 29, 2013*

**math**

thank you
*January 27, 2013*

**math**

The sum of four consecutive multiples of 5 is 230. What is the greatest of these numbers ?
*January 27, 2013*

**math**

1. If 2x/5y=6,what is the value of y, in terms of x ? 2. 11/4-a=3 , What is the value of a in the equation ?
*January 27, 2013*

**Math**

Thank u :)
*January 25, 2013*

**Math**

Working with linear equations: 3(2x+1) - 4 (x+2) = 9
*January 25, 2013*

**nursing**

For example: Kim, a neonatal ICU nurse, has cared for baby Sara for the past month. Baby Sara is about to be discharged today in good health. The baby’s parents want to give Kim a personal gift as an expression of their appreciation and have also invited Kim to the baby&#...
*January 24, 2013*

**math**

thank you , Ms.Sue
*January 23, 2013*

**math**

3. x + 11 4. H x 15
*January 23, 2013*

**math**

thank you
*January 23, 2013*

**math**

1. two times the number of windows 2. 81 increased by n 3.eleven more than a number 4. $15 times the number of hours
*January 23, 2013*

**math**

Write a variable expression for each word phrase. 1. two times the number of windows 2. 81 increased by n 3.eleven more than a number $15 times the number of hours
*January 23, 2013*

**Math**

A woman invested $15,000, part at 7% annual interest and the rest at 8%. If she earned $1,100 in income over a one-year period, how much did she invest at 7%?
*January 23, 2013*

**Physics**

Two particles are fixed along a straight line, separated by a distance 6.0 cm. The left one has a charge +2.0 nC and the right one has a charge of +6.0 nC. You must try to locate a point where the electric field is zero. (a) What is the location of the point? (b) How far from ...
*January 21, 2013*

**chemistry help !!!!!!!!!!!!!!!!**

Benzoic acid react with NH2 group Draw the product of this reaction, name the new functional group produced, state the type of reaction that has occurred, name any other products of the reaction and briefly explain how you arrived at your answer.( one or two sentences.)
*January 21, 2013*

**Physics**

True or false?equal masses of two different gases placed in containers of equal volume at equal temperature must exert equal pressures
*January 21, 2013*

**chemistry help !!!!!!!!!!!!!!!!**

Identify 4 functional group: HO-HO-BENZENE RING-CH2-CH-NH2-C=O-OH 1)carboxylic acid functional group 2)amine functional group 3)alcohol functional group i only know three is anyone can tell me the last functional group.please
*January 21, 2013*

**chemistry help !!!!!!!!!!!!!!!!**

Identify 4 functional group: O || HO CH2 C \ / \ / \ Benzen ring CH OH / | HO NH2 1)carboxylic acid functional group 2)amine functional group 3)alcohol functional group i only know three is anyone can tell me the last functional group.please
*January 21, 2013*

**Chemistry**

What mass of glucose can be produced from a photosynthesis reaction that occurs using 21.2 mol CO2? Answer in units of g
*January 20, 2013*

**Pol 201 American National Goverment**

9. The Connecticut Plan was called the Great Compromise because (Points : 1) it allowed states with larger populations to have more representatives in the House and each state to have the same number of votes in the Senate. it allowed slave states to keep their slaves. it ...
*January 20, 2013*

**Chemistry/Calculus**

Thank you, sir. However, I stillmust be doing something wrong because I am not getting the answer. My calculator will give me an error if I do it that way. On my TI-30 I punch in 2nd button, the hit Ln, then (1.00 X 10-2 / 1.65 X 10-2) and get 1.83...
*January 19, 2013*

**Chemistry/Calculus**

I have a question about how to plug in numbers on my calculator (TI-30XIIS) to get an answer. How would I put in my calculator... ln 1.00X 10-2 mol/L /1.65 X 10-2 mol/L to get-0.501? I keep getting the wrong answer...
*January 19, 2013*

**math**

1. solve for y: 2y-3<9+y 2. solve for x: 7-2x>3y
*January 19, 2013*

**English**

How did the elephant save the life oe porus.
*January 19, 2013*

**thermal physic**

What is the average translational kinetic energy of one mole Of gas molecule in an ideal gas at 37degree celsius
*January 19, 2013*

**Chemistry**

55.34g/mol^3
*January 17, 2013*