Saturday

February 6, 2016
Total # Posts: 287

**chemistry**

Please explain, in simple English, why is milk a colloid?
*January 8, 2014*

**Science Easy 2 Points!**

@alina is right! Just got a 100%! Thanks!:)
*December 12, 2013*

**Physics**

Vector V1 is 6N along the negative axis. Vector V2 is 4.5 N and point 45 degrees north of the x axis. Find the x and y components of each vector and find the resultant R=V1+V2with the components.
*November 26, 2013*

**physics**

an eraser
*November 26, 2013*

**Physics **

A 2 g bullet flying at 390 m/s hits a 2.7 kg aluminum block at room temperature and embeds itself in the aluminum. After everything has come to equilibrium, how much has the entropy of the aluminum block increased?
*November 26, 2013*

**physics**

A 1700 kg car moving south at 19.5 m/s collides with a 2050 kg car moving north. The cars stick together and move as a unit after the collision at a velocity of 5.16 m/s to the north. Find the velocity of the 2050 kg car before the collision. m/s to the north
*November 14, 2013*

**Science help! URGENT. Check answers**

1. False 2. C 3. D That is all I know! sorry! hope these are useful!
*October 21, 2013*

**science help plzzz**

@great stuff is right, I got 100% 5/5 too! Thanks!! :)
*October 17, 2013*

**the answer is actually**

The answer is actually The house of Burgesses
*October 14, 2013*

**Physics**

Imagine that if you drop an apple from a certain height, its final speed is 20 m/s when it reaches the ground. If you throw the apple vertically downward from the same height with an initial speed of 20 m/s, what will be its final speed? I tried 2mgh=1/2mv^2 so that the mass ...
*October 7, 2013*

**Physics**

A spring has an unstretched length of 9.8 cm. The potential energy stored in the spring is V when the spring is streched to a length of 11.8 cm. What is the stretched length of the spring when its potential energy is 2.2 V? What compressed length will result in a potential ...
*October 7, 2013*

**Calculus**

Determine whether Rolle's Theorem can be applied to f on the closed interval [a,b]. If Rolle's Theorem can be applied, find all values of c in the open interval (a,b) such that f'(x)=0. f(x) = x^(2/3) - 1 [-8,8] I plugged in both values and found out that they both...
*September 26, 2013*

**science**

i think its c but i'm not sure science is not my strong suit. this one is difficult.
*September 25, 2013*

**math**

Hi! I'm Maddie. I need some help on my homework. Here are three problems I need help with: A bowl contains only red marbles, blue marbles and green marbles. The probability of selecting a red marble from the bowl is 3/13. The probability of selecting a blue marble from the...
*August 21, 2013*

**Math**

Assuming lambda=0.02 and t=50, compute P(2)
*June 25, 2013*

**Math**

What is the range of values of the probability of an event?
*June 25, 2013*

**math**

You want to put $4,000 in a simple interest account. It has a 2.5% annual interest rate. How long will it take you to earn $500 in interest?
*May 27, 2013*

**Math**

How do you add fractions??
*May 14, 2013*

**physics**

What would be the final temperature when 125g of 25 degrees Celcius water is mixed with 85g of 45 Degrees Celcius water? ( hint: Equate the heat gained by the cool water with the heat lost by the warm water.)
*May 3, 2013*

**Math**

How do you find the total number of maximum and minimum points of the function whose derivative is given by f^1(x)=x(x-3)^2(x+1)^4 ???
*April 21, 2013*

**Chemistry**

Calculate the pH at the equivalence point when 50 mL of 0.098 M propionic acid is titrated with 0.340 M NaOH. I tried solving for the volume of NaOH and them using the total volume and then plugging it in to [H+][A-]/[HA] and used the Ka value for propionic acid but it was not...
*April 15, 2013*

**Chemistry**

Calculate the pH of a buffer solution that contains 0.60 M NaH2PO4, and 0.26 M Na2HPO4.
*April 14, 2013*

**Chemistry**

The pH of an 0.0870 M solution of weak acid A is 2.20. The pH of an 0.0830 M solution of weak acid B is 4.07. The pH of an 0.0890 M solution of weak acid C is 5.13. Identify the three acids from among those listed below (the Ka values are listed in Appendix E of your textbook...
*April 12, 2013*

**Chemistry**

I'm not really sure how to go about doing this problem... What is the pH of a 7.40 x 10-3 M solution of NH4Cl? Help is appreciated! Thank you
*April 7, 2013*

**algebra**

write and inequality describing this region. will an 18 wheeler hold 71 refrig's and 118 tv's or will it hold 51 refig's and 176 tv's?
*March 24, 2013*

**Chemistry**

Awesome! Thank you
*March 14, 2013*

**Chemistry**

An aqueous antifreeze solution is 31.0% ethylene glycol (C2H6O2) by mass. The density of the solution is 1.039 g/cm3. Calculate the molality of the ethylene glycol.
*March 14, 2013*

**Chemistry**

Thank you :)
*March 14, 2013*

**Chemistry**

A solution of hydrochloric acid (HCl) contains 22.5% hydrochloric by mass. What is the molality of this solution I'm not sure how to start this problem...
*March 14, 2013*

**Chemistry**

maybe my homework set online is messed up because it is not taking either of these answers :( sorry. But thank you both for your help!
*March 14, 2013*

**Chemistry**

hmmm for some reason this did not work... How did you go about solving this problem? Could any of them be a tie?
*March 14, 2013*

**Chemistry**

Rank the following compounds in order of their solubility in water. (most soluble = 1 -- least soluble = 4)--Note that for the same solubility rank the same (a tie). (CH3)2CHOH HOCH2CH(OH)CH2OH CH3CH2OH (CH3)3COH
*March 14, 2013*

**Chemistry**

Thank you so much!
*March 14, 2013*

**Chemistry**

What is the molarity of nitrate ions in a solution containing 2.20 mg of Mg(NO3)2 dissolved in 7.35 L of water?
*March 14, 2013*

**math**

If x = 15 units, y = 7 units, and h = 4 units, then what is the area of the trapezoid
*February 11, 2013*

**Algebra**

Find the integers from 1 to 144 which are perfect squares and write the square root of each one.
*February 5, 2013*

**Math**

Ten boys are to share 3 3/4 pounds of candy equally. How much candy does each boy get?
*February 3, 2013*

**Math**

1). How many shelves each 2 3/4 feet in length can be cut from a piece of lumber that is 15 2/3 feet long?
*February 3, 2013*

**Chemistry**

What mass of CH4 is contained in a 443 mL sample of CH4 at −32◦C and 282 torr? Answer in units of g. I tried so many times and I don't get it!
*January 16, 2013*

**Stats Repost**

0.057
*December 17, 2012*

**trig**

If tan y = -4/3 and y is in Q I'VE find cos 2y
*November 27, 2012*

**trig**

If tan y = -4/3 and y is in Q I'VE find cos 2y
*November 27, 2012*

**math**

a ship sail S 40 degrees W four 4 hours how do i figure out this question
*November 27, 2012*

**math**

A ship sail S 40 degrees W for 4 hours at 30 kph. make a scale drawing
*November 26, 2012*

**Physics A**

how much work is being done a bookshelf being pulled 5 meters at an angle of 37 degrees from the horizontal? The magnitude of the component of the force that does the work is 43 Newtons
*November 21, 2012*

**Physics**

An airplane flies due north at 260 km/h with respect to the air. There is a wind blowing at 60 km/h to the northeast with respect to the ground. What are the plane's speed and direction with respect to the ground?
*October 25, 2012*

**Physics**

An airplane flies due north at 260 km/h with respect to the air. There is a wind blowing at 60 km/h to the northeast with respect to the ground. What are the plane's speed and direction with respect to the ground?
*October 25, 2012*

**Algebra**

write the standard form of the equations: through (1,3) and (-4, -4) through (5,4) and parallel to y=4
*October 25, 2012*

**Algebra**

write the following in standard form: slope= 2/3 y- intercept= 3
*October 24, 2012*

**5th grade word problems**

5 3 -- * -- 100 x 5x=300 x=60 1. put 5 over 100, oranges over oranges. And 3 over X. glasses over glasses 2. cross multiply, 5*x and 100*3 3. divide both sides of the equation by 5 to get x by it's self. 4. X=60, you can make 60 glasses with 100 oranges
*October 24, 2012*

**3rd grade math HELP ASAP**

373
*October 24, 2012*

**3rd grade math**

78
*October 24, 2012*

**math**

98*3=294 294\3=98 294+98=392 392*2=784 784 Feet
*September 4, 2012*

**Science**

oh I get it now, thank you
*August 23, 2012*

**Science**

um sorry but Ms.Sue it's not supposed to be the separate functions but how it all ties together
*August 23, 2012*

**Science**

I have this last question left and I'm stuck!!! Explain how cell organelles are similar to a factory. Must be 1/2 a page.
*August 23, 2012*

**geography**

We are not geeks. WE are smart individuals.
*August 21, 2012*

**math**

Grapes cost $2 per pound. How much does the given amount cost? 0.25 pounds.
*August 19, 2012*

**math**

There are a total of eight possible outcomes for three coins: HHH, HHT, HTH, THH, TTH, THT! HTT, TTT. Out of these eight outcomes, seven of these show at least one tail (all except HHH). After counting, we find that six of these seven outcomes have at least one head, so the ...
*July 26, 2012*

**Math **

Factor the polynomial completely. 6x^3 + 36x^2 - 240x
*May 18, 2012*

**Science**

The sun emits billions of watts of light,heat,and energy ever second. How much of this light,heat, and energy does the Earth benefit from?
*March 28, 2012*

**calculus**

FInd the area of the region bounded by the graphs of y= 3x^2+1 , y=0, x=-2.7, x=2.5
*March 1, 2012*

**8th grade math**

what does the problem look like?
*March 1, 2012*

**math**

12+ 2n=60 48= 2n 24= n :)
*March 1, 2012*

**Math**

(n-14)/ 12 = 248 n-14= 2976 n= 2990
*March 1, 2012*

**math**

make sure the ratio of the dimensions stays the same. say if you had a 3 x 4 picture you could change the dimensions to 6 x 8 and because they are the same ratio the image should not be distorted.
*March 1, 2012*

**Physical Education**

I have the ability to watch it, I'm just not allowed to because we have a bandwith limit.
*February 23, 2012*

**Physical Education**

That's the thing, the program doesn't /have/ an online teacher.
*February 23, 2012*

**Physical Education**

1. Aerobic activities can be done for an extended period of time and supply oxygen to your muscles. Such activities help develop _______________________. 2. You can change your _______________________ by exercising regularly and eating healthfully. 3. The ...
*February 23, 2012*

**Pre Calc**

A plumber charges $40 per hour for labor with a minimum labor charge of $30. For example, if she does her repairs in only 0.2 hours, then $40*0.2=$8, which is less than the minimum, so she would charge $30 for labor. We will assume she can repair any problem in one day – ...
*February 6, 2012*

**math**

mae has a oval racetrack. 2 curves, each is 1/2 of the circle and each on a radius of 21". 2 straight-aways connect the circle and are 46" long. what is the total distance around the circle?
*January 26, 2012*

**math**

mae has a oval racetrack. 2 curves, each is 1/2 of the circle and each on a radius of 21". 2 straight-aways connect the circle and are 46" long. what is the total distance around the circle?
*January 26, 2012*

**Mixed numbers and improper fractions**

125/12
*January 25, 2012*

**Math**

Does anyone know the answer to the math riddle "Did you hear about..." the answer is 12 words and it's pg 167.
*December 6, 2011*

**chemistry**

A reaction occurs where the concentration of reactant A changes from 0.74 moles/liter to 0.63 moles/liter in 20 seconds. what is the average rate of reaction?
*November 17, 2011*

**social studies.**

15. What was a result of WWII on women’s rights in the US? A.Women were greatly oppressed and suffered setbacks B.Women lost the vote during wartime C.Opportunities for women increased D. None of the Above I believe its C ? 16. What happened with most of the working women...
*November 7, 2011*

**geometry**

solve this proof: PR is congruent to DE, PT is congruent to DF, Angle R is congruent to Angle E, Angle T is congruent to Angle F.. Prove Triangle PRT is congruent to Triangle DEF
*November 6, 2011*

**chemistry (please help)**

A 2.8-L engine in a vehicle with air-conditioning uses 26.5-L of coolant. If the coolant has a density of 1.11 g/ml, what mass does the coolant add to the vehicle?
*September 6, 2011*

**geometry**

If the length of a rectangle is twice its width, w, write an expression to represent the perimeter of the rectangle. If the perimeter of the rectangle is 72 inches, what is the length and width of the rectangle?
*September 6, 2011*

**Algebra**

What is 3y^2-27? Explain please.
*July 25, 2011*

**Math-geometry**

Do it yourself.
*July 13, 2011*

**math**

1. Consider the function f(x) = x3 + 7x2 + 2x - 40 . a. Find the possible rational roots of f(x) = 0. b. Use synthetic division to divide f(x) by x - 2. Show all your work. Use your answer to explain whether or not x – 2 is a factor of f(x). c. Factor f(x) completely. ...
*June 6, 2011*

**chemistry**

what sample size of .9181M vinegar would require 27.50 mL of .5185M of NaOH for neutralization?
*April 13, 2011*

**science**

what is the dencity of an object that has a mass of 92 grams and a volume of 40 milliliters? ~thx!
*March 31, 2011*

**math**

7x^2-20x=3
*March 16, 2011*

**Third Grade Math**

i think 1 gram but i need someone elses opinon....
*March 14, 2011*

**Third Grade Math**

I need a small button...
*March 14, 2011*

**Third Grade Math**

About how much does a button weigh? 1 gram 100 grams 1 kilogram 10 kilograms Thanks!
*March 14, 2011*

**math**

If there are 7:5 boys and girls in a class and there are 21 girls how many boy are there in the class?
*February 14, 2011*

**Chemistry**

I need help predicting the products and naming them using classes and subclasses. a. Br2+BaI2 b. CdBr2+Na2S c. H2+Br2 d. H3PO4+Ca(OH)2 (Numbers above are supposed to be in subscript form)
*February 10, 2011*

**calculus**

rotate the axes and eliminate the xy term of 3(x^2)+2xy+3(y^2)-8
*January 17, 2011*

**calculus**

rotate the axes and eliminate the xy term of 3(x^2)+2xy+3(y^2)-8
*January 17, 2011*

**physics**

A hallway display of energy is constructed in which several people pull on a rope that lifts a block 1.15 m. The display indicates that 1.05 J of work is done. What is the mass of the block?
*January 12, 2011*

**physics**

A hallway display of energy is constructed in which several people pull on a rope that lifts a block 1.15 m. The display indicates that 1.05 J of work is done. What is the mass of the block?
*January 12, 2011*

**Chemistry**

If .002 L of .650 M NaOH are added to 1.0 L of 0.9 M CaCl2 what is the value of the reaction quotient and will a precipitate form? I keep getting 0.0011 because I thought the answer was [Ca+][OH-] but that's not correct, I think I'm missing a final step
*December 5, 2010*

**Chemistry**

Sorry I meant Ca+ not Cu (typo) and Q value as is quotient reaction value. Q = K at equilibrium, it measures if a precipitate will form
*December 4, 2010*

**Chemistry**

One other question that I cannot figure out what I'm doing wrong is this.. If .002 L of .650 M NaOH are added to 1.0 L of 0.9 M CaCl2 what is the Q value? I keep getting 0.0011 because I thought the answer was [Cu+][OH-] but that's not correct
*December 4, 2010*

**Chemistry**

Got it, thank you!
*December 4, 2010*

**Chemistry**

How many grams of BaSO4 can dissolve in 1.5 L of a 0.010 M solution of Na2SO4? Ksp= 1.1 x 10^-10 I thought the answer was 1.1x10^-8 M then multiply by the molar mass to get the amount of grams but my answer isn't correct. PLEASE HELP!
*December 4, 2010*

**physics**

Sphere A: Is Rubber it is an insulator, and that means the electrons are all in there one space. Thats the dark spots you were talking about. Sphere B: Is Copper and it is a conductor; the electrons are all over the sphere. As is the opposite to the sphere A. And this ...
*December 1, 2010*