Thursday

September 3, 2015
Total # Posts: 395

**Thermodynamics**

A heat pump works on the vapor compression refrigeration cycle with 0.2 kg/s of refrigerant-134a as the working fluid. The cycle is used to keep a house at 26oC while absorbing heat from the outside at 3oC. R-134a enters the compressor at 200 kPa as a saturated vapor and ...
*April 23, 2012*

**Chemistry**

What is the solubility in grams per liter of SrSO4, in 0.23 M Na2SO4? Ksp for SrSO4 = 2.5E-7
*March 20, 2012*

**Chemistry**

Okay, thanks so much for your help!! :)
*February 21, 2012*

**Chemistry**

Is this the correct way to set it up & solve for the problem? [OH-] = 10^-11.63 [OH-] = 2.34E-12 I wasn't sure if it was the same set up as it is for the hydronium ion.
*February 21, 2012*

**Chemistry**

A detergent solution has a pH of 11.63 at 25°C. What is the hydroxide-ion [OH-] concentration?
*February 21, 2012*

**business law**

testing
*February 4, 2012*

**Math**

10 total marbles 3/10 red 1/9 white (since the marble isn't replaced) So, 3/10 x 1/9 = 1/30
*February 2, 2012*

**Math**

10 total marbles 3/10 red 1/9 white (since the marble isn't replaced) So, 3/10 x 1/9 = 1/30
*February 2, 2012*

**math**

3 ft = 1 yd So, 2355 ft/3ft = 785 yd
*February 2, 2012*

**math**

That's not true. 0 isn't equal to 16. & It isn't greater than 16.
*February 2, 2012*

**math**

definition of area ??? helpp :/
*February 2, 2012*

**Chemistry **

Is (NH4)2 CO3 ionic or covalent?
*January 31, 2012*

**Chemistry**

Made a mistake. ****Mole Fraction = 0.0303 moles NH4CL
*January 24, 2012*

**Chemistry**

Thanks so much for the feedback! I think I figured the answers out! :) Molarity = 0.161 M Molality = 1.74 m Mole Fraction = 1.57E-4 moles NH4Cl
*January 24, 2012*

**Chemistry **

An aqueous solution is 8.50% ammonium chloride, NH4Cl, by mass. The density of the solution is 1.024g/mL. Calculate the molality, mole fraction, and molarity of NH4Cl in the solution. I know the formulas needed but I'm not sure where to start. M = moles solute/1 L solution...
*January 24, 2012*

**Chemistry**

Thanks so much for your feedback! :)
*January 23, 2012*

**Chemistry**

Wouldn't I just leave the answer as 0.0003 moles since the question is asking for the amount of the moles of the iron ion Fe +3 ? :) That's when I got confused.
*January 23, 2012*

**Chemistry **

A student mixed 15.0 mL of a solution of 0.0200 M ferric chloride FeCl3, with 25.0 mL of water. Calculate the moles of iron ion, Fe +3 in the resulting solution. (I think this is a Dilution problem, but I wasn't really sure how to start it out. Any help would be greatly ...
*January 23, 2012*

**Grade 12 chemistry**

thats not an answer...
*December 31, 2011*

**math**

If the line 3x-4y = 0 is tangent in the first quadrant to the curve y = x^3 + k, then k is
*December 28, 2011*

**Physics**

Before starting this problem, review Multiple-Concept Example 6. The left ventricle of the heart accelerates blood from rest to a velocity of +20.6 cm/s. (a) If the displacement of the blood during the acceleration is +2.87 cm, determine its acceleration (in cm/s2). (b) How ...
*December 13, 2011*

**physics**

A cue ball (mass = 0.140 kg) is at rest on a frictionless pool table. The ball is hit dead center by a pool stick which applies an impulse of +1.60 N·s to the ball. The ball then slides along the table and makes an elastic head-on collision with a second ball of equal ...
*December 7, 2011*

**physics**

A 54.5 kg. skateboarder starts out with a speed of 1.90 m/s. He does +80.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -265 J of work on him. In both cases, the forces doing the work are nonconservative. The final speed of the ...
*November 21, 2011*

**Discrete Math**

5000
*October 27, 2011*

**MATH (REPLY FAST)**

4-3|m+2|>-14
*October 21, 2011*

**mATH**

4-3|m+2|>-14
*October 21, 2011*

**physics**

Vector (V1) is 6.3 units long and points along the negative (X) axis. Vector(V2) is 9.0 units long and points at 55 degree to the positive (X)axis. 1- What are the (X) and (Y) components of (V1) vector ? 2-What are the (X) and (Y) components of(V2) vector ? 3-Determine the ...
*October 8, 2011*

**5TH grade math**

egw
*August 25, 2011*

**american history**

What successful northern naval victory stongly proved the value of sea power?
*July 16, 2011*

**chemistry**

is the answer 24?
*July 14, 2011*

**chemistry**

If I have 10 silver coins and they weigh 55 grams and displace water from 25 mL to 35 mL, what is the density? What is the specific gravity?
*June 26, 2011*

**chemistry**

how much heat energy would it take change the temperature of 50 mL of water from 23 C to 28 C?
*June 26, 2011*

**Math**

Explain the difference between square root functions
*May 17, 2011*

**Math**

What does the solution of a system of equation mean? Give one example
*May 17, 2011*

**law of sines and cosine**

a house is built on a triangle plot of land. two sides of the plot are 160 feet long and they meet at an angle of 85 degrees. if a fence is to be built around the property, how much fencing material is needed
*April 28, 2011*

**Chemistry**

dsFA
*April 7, 2011*

**english**

the verb in this sentence is:After a pronlonged delay due to technical difficulties,the program resumed
*March 30, 2011*

**chemistry**

These are short and simple. :) I've included my answers, tell me if I am wrong please. CH3 is attached to a carbon on a pentane ring. Is the hybridization of the carbon sp3? NH connects a benzene ring to two benzene rings. Is the hybridization of the nitrogen sp2? OH is ...
*March 16, 2011*

**chemistry**

These are short and simple. :) I've included my answers, tell me if I am wrong please. CH3 is attached to a carbon on a pentane ring. Is the hybridization of the carbon sp3? NH connects a benzene ring to two benzene rings. Is the hybridization of the nitrogen sp2? OH is ...
*March 16, 2011*

**johnson**

The length of a rectangular floor is 2 feet more than its width. The area of the floor is 168 square feet. Kim wants to use a rug in the middle of the room and leave a 2 foot border of the floor visible on all sides. What should the length (the longer side) of the rug be?
*February 16, 2011*

**physics**

sasdfas
*February 3, 2011*

**management**

dsf
*January 30, 2011*

**Psychology**

Which if these questions does not help to assess the vaildity of research findings: a. How much did this study cost? b. Are the results presented fairly? c. What was the purpose of te research? d. How well was the study conducted?
*January 30, 2011*

**Critical Thinking**

What is one important distinction you could not overlook making when critically evaluating the information provided in these materials about the Boston Tea Party? Clarify the improtance of theat distinction.
*January 30, 2011*

**MATH**

STATE THE SLOPE AND Y-INTERCEPT OF THE EQUATION 5X-2Y=-10
*January 27, 2011*

**science - chemistry**

Some heat is supplied to a mixture of ice and liquid water in a closed container and the contents of the container are thoroughly mixed. If, after the addition of heat, both ice and liquid water remain: A) the temperature of the system will increase B) the vapor pressure will ...
*December 27, 2010*

**Algebra 1**

I need to find the equation for these function tables (ex. y=2x). Is there a general formula for finding the equation, or do I have to guess each time? 1. (4,3) (6,13) (8,23) 2. (5,22) (6,15) (7,8) 3. (4, 90) (6,82) (8,72)
*November 14, 2010*

**Humanities**

What are the different forms of social media that exists today?
*November 13, 2010*

**Physics**

I don't know
*November 3, 2010*

**8th grade math**

If r = 12.5 and s = |−13|, which of the following inequalities is not true? A) r ≠ s B) r < s C) r ≥ s D) r ≤ s
*November 2, 2010*

**algebra**

false
*October 30, 2010*

**algebra**

percent means hundredth true or false?
*October 30, 2010*

**algebra**

the symbol % represents percent or percentage true or false
*October 30, 2010*

**3rd grade**

asking about a halfway number is irrelavent?
*October 25, 2010*

**3rd grade**

R wants to round 47 to the nearest ten. Which halfway number can help him? 45, because it is halfway b/w 40 & 50 or 50, because it is halfway b/w 0 & 100?
*October 25, 2010*

**Chemistry Honors**

I need help balancing equations 1) CH4+O2-->CO2-->+H2O 2) Hf+N2-->Hf3N4 3) Mg+H2SO4-->MgSO4+H2 4) C2H6+O2 -->CO2+H2O 5) Pb(NO3)2 + NaI--> PbI2+NaNO3 6) Fe+O2-->Fe3O4
*October 20, 2010*

**math**

Melissa collected 3 kinds of leaves when she was out walking--- elm, maple, and oak. She has 2xs as many maple leaves as elm leaves and 5xs as many oak leaves as elm leaves. Altogether, she has 32 leaves. How many of each kind does she have?
*September 28, 2010*

**algebra**

solve for x: 2x+3y=8
*September 26, 2010*

**math**

an airplane flew with the wind for 30 minutes and returned the same distance in 45 minutes. If the cruising speed of the airplane was 320 mph what was the speed of the wind ?
*September 23, 2010*

**classics**

i meant Socrates not Sorates, sorry.
*August 10, 2010*

**classics**

can i say that Sorates head is in the clouds when he is portrayed up in the clouds in Aristophanes comedy clouds
*August 10, 2010*

**5th grade**

821213 4243 __________ Place the numbers like this then solve 821213*3, then go on to the next line and place a 0 under the last number of your previous answer, then solve it for 821213*4, then under this add two 0s and solve it for the 2, then three 0s underneath that and ...
*August 10, 2010*

**classics**

I need help writing an intro and conclusion for an essay. The thesis is : Socrates is depicted differently in Plato's dialogue and Aristophanes' Clouds in terms of the education he provides and his beliefs. I already wrote most of the middle, and am having serious ...
*August 10, 2010*

**Classics**

I have written most of the paper. The thesis is Socrates is depicted differently in Plato's dialogue and Aristophanes' Clouds in terms of the education he provides and his beliefs.
*August 10, 2010*

**Classics**

Thank You I am still having writers block writing an intro and conclusion, any ideas of things I can put in would be appreciated.
*August 10, 2010*

**Classics**

I am doing an essay on Aristophanes Clouds and The Trial and Death of Socrates by Plato. I am trying to find differences in the types of education Socrates provides? I am unclear whether he actually charges a fee in Plato ( it seems that he doesn't) ? It also seems that in...
*August 10, 2010*

**Classics**

What are some similes in The Odyssey? (lattimore translation)?
*July 27, 2010*

**CH102**

Well I didnt figure it out .... wtf kinda HW website is that frekin retards have all the Qa and no As !!
*July 16, 2010*

**book report-English**

What are some character conflicts that exist in Willy Wonka and the Glass elevator?
*May 30, 2010*

**History**

- The ways in which states around the globe have related to each other during various periods and the issues that have shaped their interactions. I need 4 specific events, at t 1 of which must come from the period prior to 1700, t one must come from 1700-1900, and 1 must come ...
*May 25, 2010*

**Chemistry**

A.136.5 or 137 B. 476
*May 15, 2010*

**math**

square root of negative numbers?
*May 13, 2010*

**Philosophy1**

Locke says, “Make these intervals of memory and forgetfulness to take their turns regularly by day and by night, and you have two persons with the same immaterial spirit, as much as in the former instance two persons with the same body.” I am having trouble ...
*May 11, 2010*

**philosophy**

what is the immaterial spirit?
*May 11, 2010*

**Philosophy1**

Locke says, "nor is it at all material to say that this same and this distinct consciousness, in the cases above mentioned, is owing to the same and distinct material substances or no" Locke was talking about consciousness defining who we are. I would think ...
*May 11, 2010*

**College physics**

To what temperature will 7700 J of heat raise 3.0 kg of water that is initially at 10.0 degrees C?
*May 6, 2010*

**Philosophy**

I need help understanding the following passage: “Could we suppose two distinct incommunicable consciousnesses acting in the same body, the one constantly by day, the other by night; and, on the other side, the same consciousness, acting by intervals, in two distinct ...
*May 5, 2010*

**Philosophy**

I need help understanding the following passage: “Could we suppose two distinct incommunicable consciousnesses acting in the same body, the one constantly by day, the other by night; and, on the other side, the same consciousness, acting by intervals, in two distinct ...
*May 5, 2010*

**college history**

if the industrial revolution increased production why did the laborers need to work such long hours weren't they producing more than before?
*March 24, 2010*

**chemistry**

What is the expression and numerical value for the equilibrium constant for the following: Ag+ + Cl- = AgCl(s) using the Ksp= 1.8*10^-10 of AgCl please show how its calculated.
*March 10, 2010*

**Accounting**

Sorry, for the mistake I made in the above post, here is the solution. Hope my calculation is correct but this is the right formula that needs to be used. The JE for 2013 mentioned above is correct; however for 2023 the JE should be: Dr. Rent Expense Dr. Defferred Rent Expense...
*March 8, 2010*

**Accounting**

Thank you for the answer! Cash should be (600*4)+11000 not "10,000" I got rent expense without dividing by the term, so that's the total off all payments considering the annual increase. Defferred Rent Expense = Rent expense - Cash
*March 8, 2010*

**physics**

omg this is soooooooooooooo hard
*February 9, 2010*

**English**

I was wondering if it was possible for you to read my essay and critique it and correct any grammar errors. I haven't written an essay in a long time, so it took me a while to come up with this. I read through my essay many times and I do hear that it doesn't flow ...
*January 27, 2010*

**sociology**

The United States, Canada, Australia, New Zealand, Japan, and the countries of Western Europe are examples of ____ countries.
*January 26, 2010*

**Algebra**

Perform the indicated operations an write the result in standard form. (9+5i)(6-4i)
*January 17, 2010*

**algebra**

I just need a quick check before I hand in my work if you would...Thanks. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6, 4)…Is this correct? 2. Multiply -2/1...
*January 8, 2010*

**Math/Check**

I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6, 4)…Is this ...
*January 7, 2010*

**Math**

B. BC..right?
*January 3, 2010*

**Math**

In ΔABC, m∠C = 118 and m∠B = 44. Which is the shortest side of the triangle A. AB B. BC C. AC
*January 3, 2010*

**Math**

Two parallel lines cut by a transversal can create all the following types of angles except A. Alternate interior angles B. Alternate exterior angles C. Corresponding angles D. Complementary angles
*January 3, 2010*

**Math**

6.25
*January 3, 2010*

**Math**

Two triangles are similar. The measure of the shortest side of the first triangle is 12 and the measure of the shortest side of the second triangle is 5. If the longest side of the first triangle measures 15, what is the measure of the longest side of the second triangle? A.2....
*January 3, 2010*

**Math**

In ABC, mB > mC and mC > mA. Which side of ABC is longest? A. AB B. AC C. BC
*January 3, 2010*

**marketing**

What do you understand by the term product mix? What role does it play in the marketing of a product?
*December 7, 2009*

**Math**

I had an assignment containing 45 problems, and I am unsure of 4, can you check and see if the answers are correct? 1. Write an equation of the line containing the given point and parallel line (5,-1), 3x-7y=9 My answer was: y=3/7x-22/7 2. Find the equation of the line having ...
*December 6, 2009*

**chemistry**

aluminum reacts with sulfric acid to produce aluminum sulfate and hydrogen gas. how many grams of aluminum sulfate would be form if 250 g H2SO4 completely reacted with aluminum?
*November 30, 2009*