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March 27, 2015

Posts by dan


Total # Posts: 937

Flec
what is a prime factor? How do I find the prime factor?
November 9, 2010

physics help
i dont get this either please help me thanks.
November 8, 2010

physics please help me
i understand but how to i go about solving this thats what i need help in, if that assumption is made.
November 7, 2010

physics please help me
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 = -.825 ball 2...
November 7, 2010

physics please help me
The pole vault landing pad at an Olympic competition contains what is essentially a bag of air that compresses from its "resting" height of 1.1 m down to 0.1 m as the vaulter is slowed to a stop. (a) What is the time interval during which a vaulter who has just ...
November 5, 2010

Calculus
P(x)= -x^3+15x^2-48x+450, x>/3 is an approximation to the total profit (in thousands of dollars) from the sale of x hundred thousand tires. find the number of hundred thousands of tires that must be sold to maximize profit.
November 4, 2010

Calculus
find the absolute extrema if they exist as well as where they occur f(x)= x-1/x^2+3x+5
November 4, 2010

Calculus
Find all extrema, inflection points, and asymptotes where applicable f(x)= 2x^3-12x^2+18x I got 0, 8 for extrema 2, 0 for I.P and I don't know how to find asymptotes
November 4, 2010

Calculus
Find the indicated absolute extremum as well as all values of x where it occurs on the specified domain f(x)= x^2e^-0.25x ; [3,10]
November 4, 2010

Math please help!
x=speed of boat in still water. assuming the problem implies 26 miles each way. to figure this out, I wrote this out in simple miles per hour terms. Example: (hours/mile)*miles + (hours/mile)*miles = hours so: (1/(x+5))*26+(1/(x-5))*26=10.6 x+5 represents the speed of the boat...
November 3, 2010

chem need assistance
Write a balanced chemical reaction to show the reaction between ammonium and a chlorite? Is this correct? 2NH3 + CLO2 + H2O ⇒ NH4Cl + NH2O2
November 1, 2010

chem
complete this reaction 2 NaNO3 + ht →
November 1, 2010

chem
Complete the reaction? IF no reaction say so H2O C4H6O3 ====> H2O c) Cu ===== > H2O d) K2O=====> e) 2 NaNO3 + ht →
October 31, 2010

HELPPPPP
so im done with everything except fro this question : A(n) 2.3 kg object moving with a speed of 8.6 m/s collides with a(n) 4 kg object moving with a velocity of 8.8 m/s in a direction39.0135◦ from the initial direction of motion mof the 2.3 kg object.What is the speed of...
October 27, 2010

Chemistry
Determine the mass of zinc sulphide,ZnS which is produced when 6.2 g of zinc and 4.5 g of sulphur are reacted. This question is really confusing me, and I'm not sure where to start. I think I have to calculate the moles of each given reactant first in which case I have: ...
October 17, 2010

Chemistry
Determine the mass of zinc sulphide,ZnS which is produced when 6.2 g of zinc and 4.5 g of sulphur are reacted.
October 17, 2010

Chemistry
I'm not understanding. what do you mean figure the moles of H2O2 in 3.4 g of water? You get the same number of moles of water? I calculated: nH2O2 = 3.4g/34.02g/mol= 0.0999412 mol Water on the other hand has 18.02 mol sorry but I'm not understanding. I think for this ...
October 17, 2010

algebra
two planes take off from an airport at the same time and head in opposite directions at 260 mph and 275 mph respectively. in how many hours will they be 1605 miles apart?
October 16, 2010

chemistry
Suppose you put 50mL of water in the can instead of 100mL and heated it to 40 degrees instead of 20 degrees. In what ways, if any, would this afect the results of the experiment? What would happen if you used 200mL of water and heated it only 10 degrees? Can you think of any ...
October 6, 2010

College Physics
A car starts from rest on a curve with a radius of 150 m and accelerates at 1.50 m/s^2. How many revolutions will the car have gone through when the magnitude of its total acceleration is 3.20 m/s^2 ?
October 4, 2010

College Chem
How many liters of carbon dioxide at 20 oC and 750 torr are produced when one gallon of toluene is burned? Convert liters to milliliters and then to grams. can you convert mil to grams?
October 3, 2010

Chemistry
1 gallon toluene = about 3,785 mL density = about 0.867 g/mL mass toluene = 3785 mL x 0.867 g/mL = 3282 grams. C7H8 + 9O2 ==> 7CO2 + 4H2O moles toluene = grams/molar mass = 3282/92 = about 36 moles. From the equation above, 1 mole C7H8 will produce 7 moles CO2; therefore, ...
October 3, 2010

Chemistry
can't convert ml to grams
October 3, 2010

Chemistry
How many liters of carbon dioxide at 20 oC and 750 torr are produced when one gallon of toluene is burned
October 3, 2010

chemistry
How much heat is released when one gram of toluene burned?
October 3, 2010

German
Actually, it is "Mein Name ist ... " or better and not as awkward (as being the correct German phrase) "Ich heiße ...".
September 24, 2010

calculus
Use the four-step process to find the slope of the tangent line to the graph of the given function at any point. (Simplify your answers completely.) f(x) = 2x^2 + 7x
September 16, 2010

Astronomy and Space
Using a telescope, which planets acn be observed from Earth in a crescent moon phase?
September 14, 2010

chem2
If you have an insulated glass of water at 25 oC containing 10 fluid oz at 25 oC, how much ice would you have to add to end up with a final temperature of 0 oC and no ice left?
September 6, 2010

chem
If this sample of dry ice were to be placed in an evacuated 1.0 L container and allowed to come to room temperature (25 oC), what would the pressure be?
September 6, 2010

chem
would you see a decrease in volume
September 6, 2010

chem
If ice were to be placed in a container at a temperature of -2 oC, with a water vapor pressure of 2 torr, you would see a decrease in the volume of solid ice over time.
September 6, 2010

chem
283.5 x .5 + 10 x 1 X (X)=0
September 6, 2010

chem
If you have an insulated glass of water at 25 oC containing 10 fluid oz at 25 oC, how much ice would you have to add to end up with a final temperature of 0 oC and no ice left?
September 6, 2010

Physical Science
.In the early 1900s, two associates of New Zealander Ernest Rutherford bombarded thin sheets of gold with positively charged subatomic particles. They found that most of the particles passed right through the sheets but some bounced back as if they had hit something solid. ...
September 3, 2010

math
You are offered two different sales jobs. The first company offers a straight commission of 4% of the sales. The second company offers a salary of $ 500 per week plus 2% of the sales. How much would you have to sell in a week in order for the straight commission to be equal to...
August 30, 2010

Accounting
HOW DO I find the net icome for this company with this information? Beginning of the year: ASSETS WERE $810,000 lIABILTES WERE:$324,000 eND OF YEAR: aSSETS WERE: $1,296,000 AND lIABILTES WERE:$540,000. cAPITAL STOCK OF $162,000 WAS ISSUSED dIVIDENDS OF $72,OOO WERE PAID
August 29, 2010

accounting
How do I find the net income for this company ,with this information? Beginning of year Total Assets were:$810,000 Total liabilites were:$324,000 End of year Total Assets were:$1,296,000 Total liabiltes were:$540,00 Capital stock of $162,000 was issued dividends of $72,000were...
August 27, 2010

algebra 2
I'm stuck on this one: factoring polynomials from algebraic expressions (and it says you can use the substitution method): 3m^2(2p^2+3)over (x^2+y)(2x-y^2) minus 6m(2p^2+3)over (y^2-x)(2x-y^2)= Do I find the GCF? I get 3m(m-2) over (x^2+y)(2x-y)(y^2-x) ????
August 15, 2010

algebra 2
I'm stuck on this one problem. The directions say: Solve the following leaving the sq. rt. in it's simplest form: sq.rt of 33+ sq.rt of 96 - sq.rt of 3 = I think it can't be simplifed---am I correct? (the directions did say that some of the problems can't be ...
August 14, 2010

xacc 280
Post one or two new concepts you learned from each of the PhxKlips
July 31, 2010

Physics
It took a stopping train 41/4min to travel between two stations 11.2km apart.The train accelerated uniformly during the first 11/4min of the journey,and decelerated uniformly to rest during the last 3/2min of the journey.The train had moved with uniform speed during the ...
July 11, 2010

Mec 123
A flywheel rotating at 5.3 revolutions per second has an angular retardation of 4/5 radian per second per minute.calculate:(i)its angular velocity after 45 seconds(ii),the number of revolutions it makes in 1 minute, and in coming to rest.
July 10, 2010

math
Show that x^2+y^2-6x+4y+2=0 and x^2+y^2+8x+2y-22=0 are orthogonal.
July 9, 2010

German
Yup. Some English here, please :) ... Would help a lot.
June 22, 2010

college
You're thinking of investing in a automation project to reduce cost of production. -Investment in Fixed Assets: $900,000 at t=0; salvage value of $300,000 at t=6; straight line deprectiation over 6 years (assume book value is 0 at t=6) -Investement in NWC: $250,000 at t=0...
June 19, 2010

geometry
A spherical water tank has a diameter of 10 feet. How much water does it hold when half full (use 3.14 for , and round to the nearest hundredth)?
June 19, 2010

trig
X=38.21
June 7, 2010

Fracture Math word
Dig
May 11, 2010

Chemistry
Is 20.0 mL of 3.0 M HF a buffer solution with an approximate pH of 3?
May 4, 2010

Chemistry
What is the molar solubility of silver sulfide, Ag2S? (Ksp for Ag2S is 6.0 x 10^51.)
May 4, 2010

chemistry
what volume would 8g of He at.951 atm and 25c occupy?
May 2, 2010

algebra-is this right
A basketball player has a vertical leap of about 36 in. If the equation d=48t^2 describes his hang time t as a function of his vertical leap d. what is his hang time? Show your work. 36=48t^2 t^2=3/4 t=(1/2)sqrt(3)seconds
April 25, 2010

algebra
Thank you for your help and reminding me there is two answers.
April 25, 2010

algebra
I was wondering if my answer is right. Let f (x)=(x+10)^2. Find x so that f(x)=72 (x+10)^2=72 x^2+20x+100=72 x^2+20x+28=0 x=(-20+-sqrt(400-112))/2 x=-10+6*sqrt(2)
April 25, 2010

algrebra
Solve by applying the quadratic Formula: all radicals should be simplified as far as possible. Show your work. a^2 -12a + 35 =0
April 25, 2010

algebra
Yes you helped me a lot. Thank you for showing me in steps how to solve this question
April 25, 2010

algebra
How do you complete the square by filling in the two blanks so as to produce a true equation. x^2 - 12x + ---- = (x - -----)^2
April 25, 2010

Brain Teaser
When Professor Sum was asked by Mr. Little how many students were in his classes, he answered, “All of them study either languages, physics, or not at all. One-half of them study languages only, one-fourth of them study French, one-seventh of them study physics only, and ...
April 15, 2010

math
Question from the Classroom: 10 A student claims that the equation Ö(-x) = 3 has no solution, since the square root of a negative number does not exist. Why is this argument wrong?
April 13, 2010

math sets
Explain whether the set {0, 1, 2} is closed with respect to addition on whole numbers.
April 13, 2010

math 213 #18
A student claims that every prime greater than 3 is a term in the arithmetic sequence whose nth term is 6n + 1 or in the arithmetic sequence whose nth term is 6n – 1. Is this true? If so why?
April 13, 2010

Math 213
Examine several newspapers and magazines and describe at least three examples of functions that appear. What is the domain and range of each function?
April 13, 2010

Chemistry
Identify the balanced net ionic equation for the reaction 2Na3PO4(aq) + 3CaCl2(aq)¨ 6NaCl(aq) + Ca3(PO4)2(s)
April 8, 2010

Chemistry
How many moles of NaBH4 are needed to generate one mole of B2H6 if the reaction gives an 80% yield? 3NaBH4 +4BF3 ¨ 3NaBF4 + 2B2H6
April 8, 2010

Chemsitry
What is the phase of a compound at 600 mmHg and 32oC if it melts at 35oC when pressure is 760 mmHg? Its triple point occurs at 200 mmHg and 36oC.
April 8, 2010

Chemistry
How many moles of PCl3 can form from a mixture of 5 mol of P and 6 mol of Cl2 according to the equation 2P + 3Cl2 ¨ 2PCl3
April 8, 2010

Chemistry
Alum is a hydrated compound containing 45.5% water. How many moles of water are contained in one mole of this hydrate. Data for alum M= 474 g∙mol-1
April 8, 2010

Algebra 2
it says (3i*ã5)2
April 1, 2010

Algebra 2
Thanks Reiny How ado I simplify? (3iã5)^
April 1, 2010

Algebra 2
Can someone help me with this?? Simplify... ã-45 x ã-20 = is it?? ã-45*-20 ã-900 3ã-30
April 1, 2010

ice cream
Suppose you have a friend named Ed. He and his four friends are having ice cream. There are only three flavors available at the ice cream store they are visiting: chocolate, vanilla, and strawberry. One of Ed’s friends, Stacey, eats chocolate exclusively. How many ...
March 30, 2010

math
A drawing of diagonals for four different polygons is listed below. What is the number of diagonals for a 100-sided polygon?
March 30, 2010

solving polynomial equations
thanks and one more thing -4=c-3/6-1-c/8+c/12
March 27, 2010

solving polynomial equations
please help 3(n+1)=5(n-3) thank you
March 27, 2010

4th grade math
R^2 + R^2 + 16R + 64 = 144 solve for R.
March 25, 2010

math
Convert the polar equation r-3cosx = 5sinx in Cartesian equation form.
March 22, 2010

math
How do you convert polar coordinates to Cartesian coordinates? And vise versa.
March 19, 2010

trig
How do you convert polar coordinates to Cartesian coordinates? And vise versa.
March 19, 2010

math
Two forces of 7 lb. and 14 lb. act on a body at right angles to each other. Find their resultant. Find the angle their resultant force makes with the force of 14 lb.
March 17, 2010

math
According to Sal's map he is is 6 units away from the grocery. The grocery store is 5 units away from the coffee shop. The coffee shop is 1 unit away from Sal's house. How is this possible?
March 16, 2010

Chemistry
Which test for iron(II) ions is conclusive?
March 16, 2010

Duval
Explain the importance of understanding inventory valuation methods in dertermining the quality of the profit
March 9, 2010

Physics
7.8hz
February 26, 2010

English
Midsummer Night's Dream: The fourth act opens with Bottom at center stage. What is your opinion of Bottom's character? How might he be the antithesis, or opposite of Theseus's character?
February 15, 2010

math
Examine three elementary schol textbook and report on how the introduction of the topic of GCD and LCM differ in the diffrent textbooks?
February 9, 2010

Chemistry
An element has bcc packing with a body-centered cubic unit cell. Its density is 19300 kg/m3 and the unit cell volume is 3.17 x 10-26 L. Calculate the molar mass (g/mol) of the element to three significant figures. The element rubidium has bcc packing with a body-centered cubic...
February 8, 2010

Finance
I need to identify the ROI and NPV of the wireless order-tracking system. Here is the information it gives me: - The aquisition cost is $35,000 paid at the time of installation. - It reduces the wait staff by one person: Figure $10 per hour, or 2020 hours per year + 18% ...
February 5, 2010

US History
I need to pick a term paper topic involving American History. I want to do something about a controversy during a war time, but I don't know what to pick. Maybe something during the Vietnam War or the Gulf War? Where could I find thesis ideas or do you have any suggestions?
February 3, 2010

Geometry.
A spherical water tank has a diameter of 10 feet. How much water does it hold when half full (use 3.14 for , and round to the nearest hundredth)?
January 24, 2010

Trigonometry
If the sine of an angle is 3/5 and the angle is not in quadrant 1, what are the remaining five trigonometric values for that angle?
January 24, 2010

Math
How would you graph the inequality x > -5
January 24, 2010

Math
How would you graph the inequality x > -5
January 24, 2010

science
I AM IN YEAR THREE I NEED SOME HELP IN MATERIALS (SCIENCE)
January 4, 2010

geomitry
a sperical water tank is being filled with the diamiter of 10 feet how much water does it hold half full use 3.14
December 15, 2009

critical thinking
how will thinking critically influence the way I read? how will thinking critically influence the way I write? how will thinking critically influence the way I process information?
December 9, 2009

sci275
how can the government be involved in conservation efforts?
December 8, 2009

chemistry
An engine goes through the following cycle with 2.60 moles sample of a diatomic gas. I. an isothermas expansion from point a to point b. II. a constant pressure compression from point b to point c. III. an adiabatic compression from point c to point a. We are given point a has...
December 7, 2009

chemistry
An insulated beaker with negligible mass contains liquid water with a mass of 0.255{kg} and a temperature of 76.0{C} How much ice at a temperature of -19.9 C must be dropped into the water so that the final temperature of the system will be 32.2? Take the specific heat of ...
December 7, 2009

HCA220
I answered several question for an assignment and I need help to understand how I got it wrong. The assignment dwelt medical terms. The following three were marked wrong. Please help! Use the word bank below to build the medical word that corresponds to each definition in ...
November 30, 2009

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