Monday
October 20, 2014

Posts by David


Total # Posts: 1,683

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
7
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

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

math
Do you mean how many separate pairings exist between two groups of objects, each of which contains eight elements? If so, the answer is (8 x 8) = 64. The reason I'm slightly cautious about the answer is that I'd have expected the second part of the question to be ...
September 17, 2010

PHI103: Informal Logic
I'll have a go at just the first one, because I think it illustrates a point that's worth making. Forget the multiple-choice options for a moment: concentrate on the original statement, which when you rephrase it slightly asserts that the only overdues at the store are...
September 17, 2010

math
What is the actual question please?
September 17, 2010

alegebra
Divide any whole number by any other whole number that isn't a factor of it. For example, try dividing 3 by 2. Is the result a whole number?
September 17, 2010

Algebra
A vehicle uses 1 tablespoon of gasoline to drive 125 yards. How many miles can the vehicle travel per gallon? Round your answer to the nearest mile. (hint: There are 256 tablespoons in a gallon)
September 16, 2010

Physics Flux
The electric flux through the surface shown in Figure Ex27.10 is 15.0 Nm2/C, and the electric field makes an angle á = 70° with the surface. What is the electric field strength? The surface is a 10cm by 10cm square.
September 13, 2010

science
ops! b.the science of patterns and relationships
September 12, 2010

science
c.the science of numbers .???????
September 12, 2010

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