Sunday

May 24, 2015

May 24, 2015

Total # Posts: 1,791

**Algebra**

Slove each system by substitution. 4x = y - 1 6x - 2y = -3 I have already attempted this problem and couldn't figure out what I should do. I came out with 4x + 1 = 3x + 1.5 I think this looks right because our teacher told us that for this specific problem that we should ...
*December 14, 2010*

**physics**

1.) A vertical spring with a spring constant of 450 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring, which is compressed 2.5 cm in bringing the block to a ...
*December 13, 2010*

**physics**

A string has a linear density of 8.5*10^-3 kg and is under the tension of 280 N. The string is 1.8 m long, is fixed at both ends, and vibrating in the standing wave pattern. What is the speed, length, and frequency?
*December 12, 2010*

**physics**

1.) The average sound intensity inside a busy neighborhood restaurant is 3.*10^-5 W/M^2. How much energy goes into each ear (area = 2.1 * 10^-2 m^2) during a one hour meal? 2.) A member of an aircraft maintenance crew wears protective earplugs that reduce the sound intensity ...
*December 12, 2010*

**physics**

The length of a simple pendulum is 0.79m and the mass of the particle at the end of the cable is 0.24 kg. The pendulum is pulled away from its equilibrium position by an angle of 8.5 degrees and released from rest. Assume that friction can be neglected and that the resulting ...
*December 12, 2010*

**physics**

1.) A vertical spring with a spring constant of 450 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring, which is compressed 2.5 cm in bringing the block to a ...
*December 12, 2010*

**algebra**

Find the mean for each set of data. Round to the nearest tenth if necessary. 12, 20, 8, 15, 16, 14, 7, 5, 11, 8, 14 a. 11.8 b. 13.2 c. 9.9 d. 10.4 My answer a)11.8
*December 12, 2010*

**Calculus**

prove that out of the rectangles under the curve = e raised to the power of -xsquared on the x axis and upper vertices on the curve, the one has the largest area the two upper vertices of which are exactly at the points of inflection of the curve.
*December 11, 2010*

**engineering science**

The power in a resistor RLOAD of 10 Ω when connected to a 100 volt supply is measured using a voltmeter and ammeter. There are two possible ways of connecting the meters as shown in FIGURE 2. The resistances RA and RV represent the internal resistances of the ammeter and ...
*December 9, 2010*

**trigonometry**

equation of circle passing through P(10,3), Q(11,8), and R(7,14).
*December 2, 2010*

**math**

what is a slope intercept?
*December 1, 2010*

**chemistry**

in outo engine whith no pollusion controls, about 5% of the fuel(assume 100%actane c8H18)is unburned .calculate the mass and volume ratio of Co to C8H18 in exhaust gas? 2C8H18+17O2 =16CO+18H2O
*December 1, 2010*

**Chemistry**

Which of the following electron configurations is not consistent with Hund's rule? 1) 1s^2 2s^2 2p^2 3s^1 2) 1s^2 2s^2 2p^6 3s^2 3p^5 3) 1s^2 2s^2 2p^6 3s^3 3p^6 4) 1s^2 2s^2 2px^2 2py^1
*November 29, 2010*

**Chemistry**

Which of the following electron configurations is not consistent with Hund's rule? 1) 1s^2 2s^2 2p^2 3s^1 2) 1s^2 2s^2 2p^6 3s^2 3p^5 3) 1s^2 2s^2 2p^6 3s^3 3p^6 4) 1s^2 2s^2 2px^2 2py^1
*November 29, 2010*

**Physics**

An aluminum cylinder with a density of 2.70 g/cm3 has a volume of 3.8 ¡¿ 10-5 m3. If the cylinder is suspended from a scale and immersed in an unknown fluid, the scale reads 0.581 N? What is the specific gravity of the fluid?
*November 23, 2010*

**college chemistry**

Being that FeO has a metal in it and a pretty strong bonding force, I would say Iron(II)Oxide. CO2 is low, H2O is 0 degrees Celsius, and sugar is relatively low as well.
*November 18, 2010*

**geometry**

francisco designed a triangular garden surrounded by three square gardens. the area of garden c (the largest garden) is 400 sq. ft. and the length of a side of garden b is 12 ft. find the lengths of all sides of the triangular gardens and find the areas of the gardens. draw a ...
*November 18, 2010*

**physics**

wow. that was simple. thank you.. i should read the question more carefully next time :D
*November 18, 2010*

**physics**

A 52 g mountain climber, start from rest, climbs a vertical distance of 730 m. At top, she is again at rest. In the process, her body generates 4.1*10^6 J of energy via metabolic processes. Her body acts like a heat engine with efficiency ( W/Q_h.) W is the magnitude of work ...
*November 18, 2010*

**science**

. What must happen in order for a sound wave to form? A. An electric current must flow. B. A certain frequency must be reached. C. Matter must vibrate. D. Volume must be absorbed.
*November 17, 2010*

**Algebra**

This is about direct variation. The area a painter can paint varies directly with the amount of time he works. One morninig, he painted 204 ft² between 8 a.m. and 12:15 PM. Write a direct variation equation to describe the area y covered in x hours. The forumlua for ...
*November 17, 2010*

**Algebra**

This is my third question about direct variation. For this problem, tell whether each relationship is a direct variation. Explain. x | -1 | 5 | 8 | y | -1.5 | 7.5 | 12 |
*November 17, 2010*

**Algebra**

This is question 2 about direct variation For this problem, tell whether each relationship is a direct variation. Explain. x | 8 | 0 | -5 | y | 13 | 5 | 0 |
*November 17, 2010*

**Algebra**

For this problem, tell whether each relationship is a direct variation. Explain. x | -3 | -6 | -9 | y | 18 | 36 | 54 | My teacher didn't really explain direct variation very well, but i did catch that you put x over y. (Hopefully this helps)
*November 17, 2010*

**chemistry**

I worked it out to need 8458.6K would this seem like resonable value? thank you for you're help
*November 17, 2010*

**chemistry**

I think charles law is needed were pressure and mole mass is constant, temperature and volume varies. Im stuck putting it all together.
*November 17, 2010*

**chemistry**

how do I calculate what temperature is needed to heat 52 grams of ethane to occupy 1200ml?
*November 17, 2010*

**physics**

An object is solid throughout. When the object is completely submerged in ethanol alcohol., its apparent weight is 15.2 N. When completely submerged in water, its weight is 13.7 N. What is its volume? Steps please.. answer isnt really necessary
*November 17, 2010*

**Physics/Chemistry**

few other questions. 1.) Suppose you expend 430 kilocalories during a long walk, how many liters of ice water at 0 degrees do you need to consume in order to use up the 430 kilocalories of metabolic energy. Stomach can hold 1 liter. 2. A person eats a container of strawberry ...
*November 17, 2010*

**Physics**

An object is solid throughout. When the object is completely submerged in ethanol alcohol., its apparent weight is 15.2 N. When completely submerged in water, its weight is 13.7 N. What is its volume? Steps please.. answer isnt really necessary
*November 17, 2010*

**Physics/Chemistry**

few other questions. 1.) Suppose you expend 430 kilocalories during a long walk, how many liters of ice water at 0 degrees do you need to consume in order to use up the 430 kilocalories of metabolic energy. Stomach can hold 1 liter. 2. A person eats a container of strawberry ...
*November 17, 2010*

**physics**

An object is solid throughout. When the object is completely submerged in ethanol alcohol., its apparent weight is 15.2 N. When completely submerged in water, its weight is 13.7 N. What is its volume? Steps please.. answer isnt really necessary
*November 17, 2010*

**C++ Programming**

Where would I find a great video resource for learning Visual C++ for beginners? I'm a newbie and I'm looking in some code for a project on sourceforge that i'm interested in. however, I don't know C++ so i don't know how to contribute to this program. ...
*November 16, 2010*

**math**

While on his way to school, Norman saw that the cost of gasoline was $2.50 per gallon. Write a direct variation equation to describe the cost y of x gallons of gas. Then graph.
*November 16, 2010*

**Chemistry**

Hi there, I am doing some data calculations for my lab, but I'm having some trouble. Given: Mass of ferrous ammonium sulfate=4.0g Mass of K3[Fe(C204)3] 3H20 =4.53g 1. Using the above mass of ferrous ammonium sulfate, calculate the theoretical yield of the K3[Fe(C204)3] ...
*November 16, 2010*

**Quick Question**

yes.
*November 16, 2010*

**math**

Writing in math, how can estimating help you add two-digit numbers?
*November 15, 2010*

**Chemistry**

Name these compounds (^these are symbolize subscripts) 1. CoCl^3 2. CrF^6 3. AgBr 4. Fe^20^3 5. CrF^3 6. TiCl^4
*November 15, 2010*

**Physics help**

A 1.0 kg object is suspended from a vertical spring whose spring constant is 105 N/m. The object is pulled straight down by an additional distance of 0.25 m and released from rest. Find the speed with which the object passes through its original position on the way up.
*November 15, 2010*

**Algebra 1**

o ok thank you
*November 14, 2010*

**Algebra 1**

write a function rule for each situation. The volume V(n) of a cube when you know the length n of a side.
*November 14, 2010*

**Chemistry**

Why do magnesium, phosphorus, and zinc exhibit slightly higher first ionization energies than the general trend within each of their periods?
*November 10, 2010*

**Chemistry Honors**

Hello, Can you please tell me how a fisher chart differs from a traditional chart?
*November 10, 2010*

**CHEMISTRY**

Hello, Can you please tell me how a fisher chart differs from a traditional chart?
*November 10, 2010*

**physics help**

A 5.00 kg ball (ball 1), moving to the right at a velocity of +4.00 m/s on a frictionless table, collides head-on with a stationary 7.60 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below. (a) elastic collision ball 1 ball 2 (b) ...
*November 9, 2010*

**economics (game theory)**

Consider the normal tick tack toe game, but this time you have to AVOID getting 3 in a row in any line. Is there any strategy you can tell me that will make sure the first mover doesnt lose. Thanks
*November 9, 2010*

**physics**

Water is flowing at 6 m/s in a circular pipe. If the diameter of the pipe decreases to five-seventh its former value, what is the velocity of the water downstream?
*November 8, 2010*

**chemistry**

predict the order of increasing acidity of the compounds. Give a brief explanation why. Butanoic acid-Nexanoic acid-Benzoic acid-Acetic acid. thx
*November 6, 2010*

**English**

which of the following words cannot use the suffix -ive? reveal- decis- conclus- impress-
*November 5, 2010*

**chemistry**

Can you tell me the geometry(around the carbon/oxygen atom) and whether this is polar or non polar CH3CH3? thx
*November 3, 2010*

**chemistry**

i need 2 lewis dot structures for C3H8O. thanks
*November 3, 2010*

**chemistry**

i need 2 lewis dot structures for C3H8O. thanks
*November 3, 2010*

**Science**

What do engineers do?
*November 3, 2010*

**science**

o ok thank u
*November 2, 2010*

**science**

Yes,I'm asking for habitat niches. the island was devastated by volcanic activity.
*November 2, 2010*

**science**

Why are so much niches available on so much recently devastated islands?
*November 2, 2010*

**Algebra**

Factorise completely: 6x^2+10x-5= and 6x^2+8x-3=
*November 2, 2010*

**8th grade**

thank you
*November 1, 2010*

**8th grade**

how do seed banks preserve seeds for future generations?
*November 1, 2010*

**chem.**

CH3COOH + C5H12O -> C7H14O2 + H2O If the yield for the reaction is 45%, how many grams of the product are formed when 3.58 g of acetic acid are reacted with 4.75 grams of isopentyl alcohol? Millimoles of acetic acid= 59.6667 Millimoles of isopentyl alcohol= 53.9773 How ...
*November 1, 2010*

**Chemistry**

CH3COOH + C5H12O -> C7H14O2 + H2O If the yield for the reaction is 45%, how many grams of the product are formed when 3.58 g of acetic acid are reacted with 4.75 grams of isopentyl alcohol? Millimoles of acetic acid= 59.6667 Millimoles of isopentyl alcohol= 53.9773 How ...
*November 1, 2010*

**physics**

A 280 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 18.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 8.00 m. (a) Find the work done by the pulling force...
*October 28, 2010*

**math**

How do I take the derivative in respect to c1 for the following utility function? u1 = log(c1) + log [1/2(x-c1-c2)] details please
*October 26, 2010*

**math**

How do I take the derivative in respect to c1 for the following utility function? u1 = log(c1) + log [1/2(x-c1-c2)] details please
*October 25, 2010*

**Physics**

Two identical cars are traveling at the same speed. One is heading due east and the other due north, as the drawing show. What is true regarding the kinetic energies and momenta of the cars?
*October 24, 2010*

**Physics**

The equation here is -8.4=.145(-32+V)
*October 24, 2010*

**O Chem **

I need help with this question please. Draw the structure of triacylglycerol formed from oleic acid, linoleic acid, and stearic acid. Give balanced equation and show how much hydrogen would be needed to reduce the triacylglycerol completely, show the product.
*October 19, 2010*

**Chemistry**

what's the answer?
*October 11, 2010*

**intro to chemistry**

A sample of nitrogen has a volume of 50.0L at a pressure of 760mmHg. What is the volume of the gas at each of the following pressures if there is no change in temperature? A. 1500mmHg B. 2.0atm C. 0.500atm
*October 11, 2010*

**intro to chemistry**

The air in a 5.00L tank has a pressure of 1.20atm. What is the new pressure of the air when the air is placed in tanks that have the following volumes, if there is no change in temperature? A. 1.00L B. 2500ml C. 750ml
*October 11, 2010*

**Statistics**

any help?
*October 10, 2010*

**Statistics**

A superstore manager wishes to give out a survey to a sample of 25 of its workers. It wants the sample to be a good representation of the workers. The table shows the numbers of workers in each section of the work force: Working tills: 32 Stacking shelves: 24 Office/managers: ...
*October 10, 2010*

**statistics**

Could you rephrase that please, I'm not getting the logic.
*October 10, 2010*

**statistics**

any help?
*October 10, 2010*

**statistics**

There are 50 members. Melvin wants to collect some infromation from seven of them. Explain how he can do this using the following set of random numbers: 86, 13, 84, 10, 07, 30, 39, 65, 97, 96, 88, 12, 39, 26, 04, 89
*October 10, 2010*

**Algebra I**

A rectangle has a width of 6x+7, a length of 13 How do I get the area?
*October 7, 2010*

**science**

More oxygen will ___________ in colder water than in warmer water.
*October 7, 2010*

**Physics**

In a cyclotron (one type of particle accelerator), a deuteron (of mass 2.00 u) reaches a final speed of 8.4% of the speed of light while moving in a circular path of radius 0.551 m. What magnitude of magnetic force is required to maintain the deuteron in a circular path?
*October 5, 2010*

**Chemistry**

Oh thank you!
*October 4, 2010*

**Chemistry**

so did I do it right?
*October 4, 2010*

**Chemistry**

A graduated cylinder massed at 34.56g and then 8.6 ml was added of an unkonwn liquid this brought the mass to 45.87g. What is the density? I'm not sure how to go about this. Is the 34.56g unneccessary information? Or, do you subtract 45.87-34.56= 11.31 then do mass 11.31/...
*October 4, 2010*

**medical terminology**

which of the following is an example of a symptom?
*September 29, 2010*

**science**

microscope lens used to locate the specimen
*September 28, 2010*

**Biology**

not helping !
*September 23, 2010*

**Biology**

Eggs of Amphioxus is : (a)alecithal (b)telolecithal (c)meiolecithal (d)mesolecithal is it A ?
*September 23, 2010*

**Biology**

Human cell
*September 23, 2010*

**Chemistry**

the water will freeze
*September 20, 2010*

**Algebra**

A certain can of iced tea contains 4% of the recommended daily allowance of sodium. The recommended daily allowance is 2500 milligrams. How many milligrams of sodium are in the can of iced tea?
*September 20, 2010*

**10th grade**

A rational number is ____ a real number. a. always b. never c. sometimes its always ???????
*September 20, 2010*

**personal finance concepts**

Donna and Sherman Terrel are preparing a budget for 2010. Donna is a systems analyst with an airplane manufacturer, and Sherman is working on a master's degree in educational psychology. The Terrels do not have any children or other dependents. Donna estimates her salary ...
*September 20, 2010*

**Math**

Hi - there are any number of them, but they're all infinite series: if you go to Wikipedia and look up "pi", you'll find at least fifteen of them in the "Computation in the Computer Age" section of that entry.
*September 19, 2010*

**criminal justice**

Follow Bob Pursley's link on the difference between Morals and Ethics in his response to "Ilisa" a little further down this list: it'll give you some help in at least defining the problem, if not some help answering it.
*September 19, 2010*

**Statistics**

a - either you've just seen something that's phenomenally unlikely, or the coin's owner isn't being truthful about the fairness of the coin. b - you've just seen something that's consistent with the coin's owner's pronouncement that the coin is ...
*September 19, 2010*

**Statistics**

The first thing you need is a random selection of graduates whose salaries can be compared... and that's probably the trickiest bit, because getting a genuinely random selection of graduates could more difficult than you might think. Suppose for example your subject is ...
*September 19, 2010*

**math**

Oops: I've got the last bit of the explanation of c) incorrect, but I'm sure you can correct it.
*September 19, 2010*

**math**

What fun! a) You can cancel out numbers that are common to the top and bottom of a fraction... but you can't cancel individual digits! b) These examples suggest that a/b + c/d = (a+c)/(b+d). Wrong! c) These examples suggest that {a+(b/c)} - {d+(e/f)} = {(a-d) + (b-e)/(f-d...
*September 19, 2010*

**U.S. Government**

A depressing, but no doubt accurate explanation. We have a similar system over here in the UK: it's been either "Heightened" or "Extreme" for as long as I've been aware of it - and now that you've spelt it out, I realise I'd actually assume ...
*September 18, 2010*

**math**

This has been posted elsewhere, and is answered there.
*September 18, 2010*