Thursday

February 11, 2016
Total # Posts: 4,242

**physics**

a heat engine operates between 403 K and 1263 K at 67% of Carnot efficiency. How much work can it produce from 5900J of input heat?
*November 6, 2013*

**Calculus-Aproximate Areas**

A ball is thrown upward at time t = 9 seconds on planet Ubuntu, and its acceleration from time t=9 seconds to t=21 seconds is given by the function . a(t) = (3) / (t - 8) m/s^2 Use 4 time intervals of equal length to overestimate, and then underestimate, the relative velocity ...
*November 6, 2013*

**econ**

Market demand facing a monopolist is Qd=-5P+20. If the monopoly practices perfect price discrimination, what is the profit-maximizing level of output when MC=$2?
*October 31, 2013*

**Calculus-concavity and graphing**

(2x+1)/(8x+1) f is increasing for x: f is decreasing for x: find local max/min:
*October 30, 2013*

**Calculus-Applied Optimization Problem: **

Find the point on the line 6x + 3y-3 =0 which is closest to the point (3,1). Note: Your answer should be a point in the xy-plane, and as such will be of the form (x-coordinate,y-coordinate)
*October 30, 2013*

**chemistry**

calculate the molar mass of a liquid if .955grams of its vapors occupy 2.50Liters at 200 Celsius and 45 torr
*October 30, 2013*

**chemistry**

God bless you all :) <3 :)
*October 25, 2013*

**Calculus Homework**

Find the largest region over which the function f is increasing or decreasing, for: f(x):(x-4)/(x+8) f is increasing for x=
*October 23, 2013*

**Calculus-Mean Value Theorem**

Find the function G(x) whose graph passes through (pi/38,-12)and has f(x) as its derivative: G(x)= I already found which is: F(x)=76(1/-19)cos(19x)+C
*October 23, 2013*

**Practice Exam Calculus**

f(x) = 6sqrt{x}- 9x n the interval [1,9]. f(c)=f(9)-f(1)/9-(1)=? Verify that the conclusion of the Mean Value Theorem holds by computing Now find,c in (1, 9) so that f'(c) equals the answer you just found. c=?
*October 22, 2013*

**Math**

378 squared feet - it could be wrong so i suggest you try working it out with someone besides me first.
*October 21, 2013*

**physics**

1.what is the final velocity of a hoop that rolls with out slipping down a 3.00m high hill starting at rest? 2. a 1.80 m radius playground merry go round (disk = 1/2 m r^2) hass a mass of 120 kg and is rotating with an angular velocity of .600 rev/s. what is the angular ...
*October 21, 2013*

**chem 1211**

P2 +3H2=2ph3 How many grams of ph3 can be formed when 37.5 grams of p2 and 83 L of h2 gas are reacted at 1 atm and 273.25 K? I really need a step by step of this problem. Thanks in advance!
*October 21, 2013*

**Chemistry**

Choose from the list the correct electron configurations for the following ions. A B C D E F G H I J K+ A B C D E F G H I J In+ A B C D E F G H I J Li+ A B C D E F G H I J Na+ A. 1s22s22p63s23p6 B. 1s22s22p63s23p64s23d104p64d105s25p1 C. 1s22s22p63s23p63d104s2 D. ...
*October 20, 2013*

**mathematics**

exmples of logarithms
*October 15, 2013*

**Physics-Help Please!**

a 25gram bullet is fired upward through a .36kg block. the block goes up 17cm in the air and the bullet goes up 24m into the air. What is the initial velocity of the bullet?
*October 12, 2013*

**physics**

a .025kg bullet is fired upward through a .36kg block. the block goes .17meters and the bullet goes up 24 m in the air. what is the initial velocity of the bullet?
*October 9, 2013*

**Chemistry**

During your experiment, you are drive water from the hydrate M x X y ⋅zH 2 O . You subsequently determine that your hydrate has four molecules of waters associated with each formula unit. However, the bottle the hydrate came from indicated a formula with only six ...
*October 8, 2013*

**maths**

A little late but here is the answer: You know that the rate of change of the volume is dV/dt = 2 (given in the question). You also know that V = x^3 + 25x To find the rate of change of the depth of the liquid, we find dx/dt = dx/dV x dV/dt dV/dx = 3x^2 + 25, so dx/dV is 1 ...
*October 3, 2013*

**Eng. Comp III**

I'm not sure what I am supposed to do here I am to write a Bibliographic essay on my sources for my final research essay - what does this entail? I don't want you to do my homework for me,just give me a couple of examples please, Thank You, Sara
*October 3, 2013*

**health HELP**

4. Which of theses provides the most Vitamin A? Vitamin B, Vitamin C, Vitamin D, Vitamin E, Vitamin K? Cheeseburger French fries, 10 strips Oatmeal cookie Cup of apple juice Cup of chocolate milk
*October 2, 2013*

**health HELP**

Which of theses items provide the most zinc? Cheeseburger French fries, 10 strips Oatmeal cookie Cup of apple juice Cup of chocolate milk
*October 2, 2013*

**math**

write each addiction vertically. decide which new groups you will make. then add to see if you were correct. 256+1.273 A new ten? A new hundred? A new thousand?
*October 1, 2013*

**music (Anyone)**

who knows 2 same pieces of music but have different performers?
*October 1, 2013*

**physics**

A shopper in a supermarket pushes a loaded cart with a horizontal force of 12 N. The cart has a mass of 33 kg. (a) How far will it move in 7.0 s, starting from rest? (Ignore friction.) m (b) How far will it move in 7.0 s if the shopper places her 30 N child in the cart before ...
*September 30, 2013*

**Math**

5th grade parent can you please show me how to break down 4 4/5 does it end up being 24/5? the probleam is: 4/4/5 -1 7/8
*September 30, 2013*

**math**

Thank you Jai!
*September 30, 2013*

**math**

5th grade math parent. This will sound dumb but.... 5/7 1/2 and 3/14. The sum is 1 3/7 correct? The question reads MArshall surveyed his classmates and found 5/7 have a sister, 1/2 have a brother, and 3/14 do not have siblings. The question is: Why does it make sense for the ...
*September 30, 2013*

**math**

5th grade math parent. This will sound dumb but.... 5/7 1/2 and 3/14. The sum is 1 3/7 correct? The question reads MArshall surveyed his classmates and found 5/7 have a sister, 1/2 have a brother, and 3/14 do not have siblings. The question is: Why does it make sense for the ...
*September 30, 2013*

**Physics**

A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car
*September 25, 2013*

**Physics**

A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car
*September 25, 2013*

**Physics**

A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car
*September 25, 2013*

**Physics**

A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car
*September 25, 2013*

**Physics**

A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car
*September 25, 2013*

**Physics**

A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car
*September 25, 2013*

**Physics**

a car travels at 25m/s on a flat stretch of road. The driver must maintaint he pressure on the accelerator to keep the care moving at this speed. What is the net work done on the car over a distance of 250m?
*September 25, 2013*

**Physics**

a car travels at 25m/s on a flat stretch of road. The driver must maintaint he pressure on the accelerator to keep the care moving at this speed. What is the net work done on the car over a distance of 250m?
*September 25, 2013*

**English**

Thanks again for your help.
*September 24, 2013*

**English**

Okay...
*September 24, 2013*

**English**

What does stilted mean?
*September 24, 2013*

**English**

I think that "and" shouldn't be added after fish.
*September 24, 2013*

**English**

How would you evaluate this writing piece in terms of writing, grammar, style and content?
*September 24, 2013*

**English**

Thankyou so much Writeacher! Please let me know if you see any other spelling or grammar errors.
*September 24, 2013*

**English**

This sentence needs to be paraphrased: This environmental concern should be addressed through legislative (law) changes, and enforcement to the Species at Risk Act, and the Environmental Protection and Clean Water Acts. There is alot of "and" used here.
*September 24, 2013*

**English**

Was there any spelling or grammar mistakes in this writing piece?
*September 24, 2013*

**English**

I think "concern" is word that is also all over the place.
*September 24, 2013*

**English**

I'm done working on my first post. Let's work on this post please?
*September 24, 2013*

**English**

Alright, please check my other post to see my responses :)
*September 24, 2013*

**English**

Please track the errors by editing this passage of writing. This is an exercise for my English homework. I have made a couple of changes or editing to the writing piece already, but I am not sure if there are more editing that needs to be made. Also, please evaluate the ...
*September 24, 2013*

**English**

Alright, thanks for your help!
*September 24, 2013*

**English**

I am not sure either. I haven't written this piece. It was an exercise for my homework assignment.
*September 24, 2013*

**English**

Thankyou Writeacher :) I don't know #4 either. Would this work?: Toxicity assessment of oil sands use process affected water for fish cell lines.
*September 24, 2013*

**English**

Thanks Anonymous! I need help with paraphrasing this sentence: Toxicity assessment of oil sands process-affected (process affected) water using fish cell lines.
*September 24, 2013*

**English**

- Yes, Take oil out of the sands is much more smoother. - AB means Alberta. - This phrase seems akward to me: Natives get sick from eating to (too) many fish from mercury and air pollution is another big problem.
*September 24, 2013*

**English**

I need help with editing these sentence structures shown below, which is used in this writing piece. For example, can we break it into two sentences. This way it would make or sense. 1). Natives get sick from eating to (too) many fish from mercury and air pollution is another ...
*September 24, 2013*

**English**

Please track the errors by editing this passage of writing. This is an exercise for my English homework. I have made a couple of changes or editing to the writing piece already, but I am not sure if there are more editing that needs to be made. Also, please evaluate the ...
*September 24, 2013*

**Chemistry**

What volume of 0.01 M NaOH should be required to raise the pH of a litre of 25 mM H2SO4 to 4.0? I started out by attempting to find the initial pH of H2SO4 and determined I need 2.57 units of pH to raise it to 4. I know that somewhere I use the HH equation, but don't know ...
*September 22, 2013*

**College Physics 1**

A space probe has two engines. Each generates the same amount of force when fired, and the directions of these forces can be independently adjusted. When the engines are fired simultaneously and each applies its force in the same direction, the probe, starting from rest, takes...
*September 17, 2013*

**pre calcalus**

(x+4)^2/3=9
*September 16, 2013*

**math**

i didnt get how 16x^2 turned into 8x^2 16x^2 = 30x + 4 Solving for x, 8x^2 - 15x - 2 = 0
*September 16, 2013*

**simple math**

If a= 9990.9 and b= 9886.1. First, convert these to scientific notation. If only three significant digits are allowed in decimal portion (mantisa) of the scientific notation and chopping and not rounding is used, what is a-b?
*September 14, 2013*

**Sociology**

I need to break a folkway and write an essay on it - any ideas?
*September 7, 2013*

**American Gov**

What is the primary claim made by those who oppose hate crimes legislation?
*September 6, 2013*

**Geography**

thank you Ms.sue
*September 5, 2013*

**Math**

if Kenneth has 22 problems of math to do for homework and had already done 12 problems done he would have to subtract 22-12=10 and then multiply 22 divide12 =10
*August 27, 2013*

**physics**

A car accelerates from 44 m/s to 52 m/s in 3.4 seconds. What distance is covered?
*August 24, 2013*

**Maths**

A ramp was built to move equipments into a shed. The ramp rises one foot. If the lower edge of the ramp is 8 feet from the base of the shed what is the approximate length in feet of the ramp Can someone please help me with this question
*August 21, 2013*

**Sociology**

Diane Kendall,9th edition, the question for assignment 1 is the review the top 10 values listed in textbook and decide which values are missing from the list and why were they not listed.
*August 19, 2013*

**Pre Calculus 2**

A ship regularly travels between two ports that are 350 miles apart. When traveling directly from A to B, the ship sails on a bearing of . However, to avoid a storm, one day the ship leaves A on a bearing of and travels for 6 hours at 17mph. When the bad weather has passed, it...
*August 4, 2013*

**Calculus!!**

Using the identity: L{f(t)/t}=integral F(p)dp (s -->infinity), find the integral of: sin(t)/t dt (0-->infinity)
*July 28, 2013*

**Ehglish**

How would you analyze an audience for the topic: Should regulations for home schools be changed?
*July 27, 2013*

**Calculus HELP!**

Use the fact that L{f'}=sF-f(0) to derive the formula for L{cosh at}
*July 27, 2013*

**Chemistry**

Okay, cool. So, the oxidation state of Co is 2+. Co2+ = [Ar]4s2 3d7 Metal cations get rid of the s orbital before the d, so can I say then the number of unpaired electrons is 7?
*July 26, 2013*

**Chemistry**

The complex [Co(ox)3]4- has a high-spin electron configuration. How many unpaired electrons are there in the complex? I know because it's a high-spin, it's tetrahydral shaped. But I don't know what (ox) is so, I'm stuck in finding the oxidation state of Co ...
*July 26, 2013*

**Calculus**

Find the Laplace transform of: f(t)=t-2e^(3t)
*July 25, 2013*

**Chemistry**

CoCl2<->CO+Cl2 Keq=7.6*10^-4 M CoCl2 is introduced in a closed container until its concentration is .890 M. What will be the concentration of Cl2 once the reaction has reached equilibrium?
*July 20, 2013*

**Chemistry**

How many liters of Cl2 has at a pressure of .950 atm and a temperature of 298K will be collected from the reaction of 25 mL of a .100 M aqueous solution of KMnO4 and an excess of HCI? KMnO4+HCI->MnCl2+Cl2+H2)+KCl
*July 20, 2013*

**Chemistry**

An aqueous solutions is 18.7% by mass Na3PO4. What is the boiling point of this solution? The Kb for water is .512 C/m. Consider if the solute is an electrolyte or a nonelectrolyte.
*July 20, 2013*

**Chemistry**

When the following reaction took place at 23.8 and a pressure of 758 torr, 3.9 L of o2 were collected. What mass of KCIO3 decomposed? KCIO3->KCI+O2
*July 20, 2013*

**Chemistry**

A mixture containing 5 g of H2 and 10 g of o2 is allowed to react in a 15 L rigid container at a constant temperature of 25 C. H2+O2->H2O Once the reaction is complete, what will be the pressure of the excess gas inside the container?
*July 20, 2013*

**Chemistry**

A sample of oxygen is collected over water at 22 C and 762 torr. What is the partial pressure of the dry oxygen? The vapor pressure of water at 22C is 19.8 torr.
*July 20, 2013*

**Chemistry**

A gas mixture containing N2 and O2 was kept inside a 2 L container at a temperature of 23 C and a total pressure of 1 atm. The partial pressure of oxygen was .722 atm. How many grams of nitrogen were present in the gas mixture?
*July 20, 2013*

**Chemistry**

A sample of oxygen is collected over water at 22 C and 762 torr. What is the partial pressure of the dry oxygen? The vapor pressure of water at 22C is 19.8 torr
*July 20, 2013*

**Chemistry**

Calculate the percent yield for the reaction if 76.8 g of H2O reacted and 125 g of NO were produced. NO2+H2O->HNO3+NO
*July 20, 2013*

**Chemistry**

Calculate how much acetylene (C2H2) can be produced from 358 g of H20 and an excess of CaC2 if the perfect yield for this reaction is 94.5% CaC2+H2)-> C2H2+C2H2+CA(OH)2
*July 20, 2013*

**Chemistry**

Calculate the number of moles of excess reactant that will be left-over when .350 g if HCN react with .500 g of 02: HCN+O2->N2+CO2+H20
*July 20, 2013*

**Solution Set**

The Y-coordinate of the solution of the system {x+y=3 {-3x+2y=-19 the answer is -2 how? I've done everything to try to solve!
*July 18, 2013*

**Calculus**

Find the complete solution to the 2nd ODE: 2y''+3y'+y=t^(2)+3sin(t)
*July 18, 2013*

**Solution Set**

Find the solution of |x-2|>8 The answer is {1,4} how?
*July 17, 2013*

**Chemistry**

Identify the type of structural isomerism that exists in each of the following pairs of compounds. (a) [CoCl2(NH3)4]Cl·H2O and [CoCl(NH3)4(H2O)]Cl2 coordination isomerism geometrical isomerism hydrate isomerism ionization isomerism linkage isomerism optical isomerism (b...
*July 17, 2013*

**Chemistry**

Identify the type of structural isomerism that exists in each of the following pairs of compounds. (a) [CoCl2(NH3)4]Cl·H2O and [CoCl(NH3)4(H2O)]Cl2 coordination isomerism geometrical isomerism hydrate isomerism ionization isomerism linkage isomerism optical isomerism (b...
*July 17, 2013*

**Chemistry**

1. Write the formula for these compounds: a) sodium tris(oxalato)rhodium(III) b) sodium tetrachloroplatinate(II) c) triamminetrichloronickel(IV) sulfate For a) I put: Na3Rh(C2O4)3, however got an error message of this: "Your answer appears to be missing required square ...
*July 17, 2013*

**Simplify Math**

m^(3/4)/m^(5/4)m^-2 hopefully you understand the equation.
*July 13, 2013*

**Linear Equation**

A gas station sells regular gas for $2.20 per gallon and premium gas for $2.70 a gallon. At the end of a business day 220 gallons of gas were sold and receipts totaled $519. How many gallons of each type of gas were sold? I know its a linear equation. just cant find out how to...
*July 12, 2013*

**Chemistry**

A couple questions here: 1. How do you expect nitriding to change the properties of iron? a) Nitriding makes iron stronger. b) Nitriding makes iron weaker. c) Nitriding makes iron more electrically conductive. d) Nitriding makes iron less electrically conductive. 2. Calculate ...
*July 10, 2013*

**business communication**

would you please rephrase it? my boss has given me to rewrite it for international employees. i want it to have in simple english so that every body can understand
*July 10, 2013*

**business communication**

can you plz correct it Howdy comrades! Shouldn’t surprise anyone that we took a beating this year, given the insane pricing moves our knucklehead competitors have been making. I mean how those clowns can keep turning a profit is beyond me, what with steel costs still ...
*July 10, 2013*

**Calculus-HELP!!!**

Find a general solution to the first – degree ordinary differential equation. If an initial condition is given, find the corresponding particular solution. Write solution explicitly if possible: dx/dt=sqrt(x+t+1)
*July 8, 2013*

**Calculus-HELP PLZ !!!!**

Find a general solution to the first – degree ODE. If an initial condition is given, find the corresponding particular solution. Write solution explicitly if possible. (9x^2+y-1)dx-(4y-x)dy=0, y(1)=0
*July 7, 2013*