Wednesday

April 1, 2015

April 1, 2015

Total # Posts: 619

**chem please**

If 60 g water is evaporated from the solution at the same time as the temperature is reduced from 25.0 to 0.0 degree celsius, what mass of KNO3(s) will recrystallize?
*February 1, 2009*

**chemistry: again**

What is the predominant type of intermolecular force in I2 (iodine)?
*February 1, 2009*

**Chemistry: help please**

What is the millimolar solubility of oxygen gas,O2, in water at 20 degree celsius, if the pressure of oxygen is 1.00atm?
*February 1, 2009*

**science please!**

Estimate the value of the cell potential for the following rxn: Mn02(s) + 4H30+(pH=3.8) + 2Ag(s) --> Mn2+(aq, .1M) + 6H20(l) I got Ecell=.48V delta G circle= -92640 J/mol and delta g = -107484 is this correct?
*January 20, 2009*

**science**

how does the life cycle of hatena compare to the origin of eukaryotic cells as noted in Margulis’ Endosymbiotic Theory? something about how one life form engulfs another and incorporates it, evolving until it becomes dependent on it and has created an entirely new life ...
*January 20, 2009*

**biology**

how does the life cycle of hatena compare to the origin of eukaryotic cells as noted in Margulis’ Endosymbiotic Theory? something about how one life form engulfs another and incorporates it, evolving until it becomes dependent on it and has created an entirely new life form?
*January 19, 2009*

**bio**

how does the life cycle of hatena compare to the origin of eukaryotic cells as noted in Margulis’ Endosymbiotic Theory? something about how one life form engulfs another and incorporates it, evolving until it becomes dependent on it and has created an entirely new life ...
*January 19, 2009*

**chemistry**

an electrochemical cell uses Al and Al+3 in one compartment and Ag and Ag+ in the other write a balanced equation for the rxn that will occur spontaneously in this cell would that just be Al + Al+3 + 2e --> Ag + Ag+ ?
*January 18, 2009*

**Algebra II- please help!**

Thank you, Reiny. My teacher taught me something very similar to your method and now I understand it. Thank you for your help! : )
*December 10, 2008*

**Algebra II- please help!**

Thank you so much, Damon! You really helped me out! : )
*December 10, 2008*

**Algebra II- please help!**

I just cannot seem to be able to grasp the concept of solving polynomial inequalities. Can someone please explain, step by step, how to solve them? Here's a problem I can't solve. Please use this as an example: (x-2)(x-5)<0 I cannot thank you enough for helping me ...
*December 10, 2008*

**biology**

what are the three parts of the cell theory?
*November 25, 2008*

**science**

what are the four properties that can be used to classify elements?
*November 12, 2008*

**algebra 2**

how do you solve this? -2square root7-4square root7
*October 26, 2008*

**history HHHEEELLLPPP!!!**

What is the society and environment of the coastal plains?
*October 9, 2008*

**chemistry**

what is a summary of observed behavior? maybe im thinking about it too much and its simple but im lost! HELP
*October 7, 2008*

**history**

Why did the cowboys go west?
*October 7, 2008*

**history HHHEEELLLPPP!!!**

did the railroad workers go west for job opportunities and technological advances?
*October 7, 2008*

**history**

they went west for job opportunities and for technological advances?
*October 7, 2008*

**history**

what are two reasoms why the railroad workers went west?
*October 7, 2008*

**history HHHEEELLLPPP!!!**

thankyou
*October 7, 2008*

**history HHHEEELLLPPP!!!**

Why did the miners move west? 2 reasons
*October 7, 2008*

**calculus**

Evaluate the following limit lim x^2 + 3x - 40 x-->5 ------------- 3x + 10 - x^2
*September 27, 2008*

**science**

how does yeast cause bread to rise?
*September 26, 2008*

**chemistry**

Consider the following reaction: 2HBr(g)---> H_2(g) + Br_2(g) B)In the first 15.0s of this reaction, the concentration of HBr dropped from 0.510M to 0.455M. Calculate the average rate of the reaction in this time interval. C)If the volume of the reaction vessel in part (b) ...
*September 24, 2008*

**English-Symbolism**

Need help with symbolism project. thank you for your help.? I need help with explaining symbolism of the ax from black cat. Do you know what symbolism mean is? THANK YOU FOR YOUR HELP
*September 13, 2008*

**physics**

A closed surface encloses a net charge of 0.00000210 C. What is the net electric flux through the surface?
*September 12, 2008*

**physics**

A point charge of -4.00nC is at the origin, and a second point charge of 6.00nC is on the axis at x = 0.800m . Find the magnitude and direction of the electric field at each of the following points on the axis. x_2 = 17.0cm, x_3 = 1.30m , x_4=-17.0cm
*September 12, 2008*

**history HHHEEELLLPPP!!!**

Thankyou Ms.Sue!!! It helped alot.
*September 11, 2008*

**history HHHEEELLLPPP!!!**

How did the rich Southern planters regain control in the south after the civil war?
*September 11, 2008*

**history HHHEEELLLPPP!!!**

i couldn't find it in my text book.
*September 11, 2008*

**history HHHEEELLLPPP!!!**

can you help?
*September 11, 2008*

**history HHHEEELLLPPP!!!**

yes
*September 11, 2008*

**history HHHEEELLLPPP!!!**

How did the rich southern planters regain control in the south after the civil war???
*September 11, 2008*

**history**

thankyou Ms.Sue!!!!
*September 11, 2008*

**history**

How did congress try to counteract the Jim Crow Laws?
*September 11, 2008*

**chemistry**

Benzene has a heat of vaporization of 30.72kJ/mol and a normal boiling point of 80.1 degrees C. At what temperature does benzene boil when the external pressure is 470 torr?
*September 7, 2008*

**chemistry**

Calculate the amount of heat required to completely sublime 24.0 g of solid dry ice CO_2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kJ/mol.
*September 7, 2008*

**physics**

what does E mean? Could you explain it another way because I'm confused.
*September 5, 2008*

**physics**

I tried that and got 1.8x10^8 but it wasn't the right answer
*September 5, 2008*

**physics**

Calculate the electrical attraction that a proton in a nucleus exerts on an orbiting electron if the two particles are 1.13×10^-10 m apart.
*September 5, 2008*

**math**

Solve for w: P=2L+2W
*September 1, 2008*

**social studies**

When did the firt migrants arrive in the americans
*August 27, 2008*

**Math**

If you are writing a number sentence based on a given word problem do you include the clarrifying words or just the numbers? There are 12 students in class. If they are divided into 3 groups, how many children will be in each group?
*August 11, 2008*

**Reseach paper**

I am also doing the same paper and am having the exact same problems as the rest of you. Try this, I read and re-read the sentences in every paragraph that I did and realized that I could make two senteces out of one that I wrote to reach the six sentence requirement on each ...
*June 21, 2008*

**Hello!**

I love cyber chickens!!! Do you???
*May 19, 2008*

**Math**

bla bla bla because he has no tea bla bla bla
*May 13, 2008*

**physics**

According to one set of measurements, the tensile strength of hair is 196 MPa, which produces a maximum strain of 0.400 in the hair. The thickness of hair varies considerably, but let's use a diameter of 50.0 u(mu)m . What is the magnitude of the force giving this tensile ...
*April 18, 2008*

**physics**

If a vibrating system has total energy Eo , what will its total energy be (in terms of Eo) if you double the amplitude of vibration? If you want to triple the total energy of a vibrating system with amplitude Eo , what should its new amplitude be (in terms of Ao)?
*April 18, 2008*

**physics**

It is reasonable to assume that the bulk modulus of blood is about the same as that of water (2.20 GPa). As one goes deeper and deeper in the ocean, the pressure increases by 1.0*10^4 Pa for every meter below the surface. If a diver goes down 33.0 m (a bit over 100 ft) in the ...
*April 13, 2008*

**physics**

A thin, light string is wrapped around the rim of a 4.00kg solid uniform disk that is 30.0cm in diameter. A person pulls on the string with a constant force of 100N tangent to the disk. Find the linear acceleration of its center of mass. If the disk is replaced by a hollow ...
*April 12, 2008*

**physics**

A woman with mass 50.0kg is standing on the rim of a large disk that is rotating at 0.500rev/s about an axis perpendicular to it through its center. The disk has a mass of 110kg and a radius of 4.00m. Calculate the magnitude of the total angular momentum of the woman-plus-disk...
*April 12, 2008*

**physics**

A woman with mass 50.0kg is standing on the rim of a large disk that is rotating at 0.500rev/s about an axis perpendicular to it through its center. The disk has a mass of 110kg and a radius of 4.00m.
*April 12, 2008*

**physics**

The outstretched hands and arms of a figure skater preparing for a spin can be considered a slender rod pivoting about an axis through its center. When the skater's hands and arms are brought in and wrapped around his body to execute the spin, the hands and arms can be ...
*April 12, 2008*

**physics**

In the figure, forces A, B, C and D each have magnitude 50.0 N and act at the same point on the object. What torque (magnitude and direction) does A force exert on the object about point P? What torque (magnitude and direction) B does force exert on the object about point P? ...
*April 12, 2008*

**physics**

A solid uniform marble and a block of ice, each with the same mass, start from rest at the same height above the bottom of a hill and move down it. The marble rolls without slipping, but the ice slides without friction. Find the speed of each of these objects when it reaches ...
*April 6, 2008*

**algebra**

The diagonal of a square connects the points (8,-2) and (-1,-11). Find the perimeter of the square.
*March 18, 2008*

**physics**

An 8.00kg package in a mail-sorting room slides 2.00 m down a chute that is inclined at 53.0 degrees below the horizontal. The coefficient of kinetic friction between the package and the chute's surface is 0.400.Calculate the work done on the package by friction. Calculate...
*March 6, 2008*

**physics**

In a rescue, the 64.0 kg police officer is suspended by two cables,the cable on the left made a 35 degree angle, the rope on the right made a 48 degree angle. What is the tension in the left cable? Find the tension in the right cable.
*February 27, 2008*

**physics**

A tetherball leans against the smooth, frictionless post to which it is attached.The string is attached to the ball such that a line along the string passes through the center of the ball. The string is 1.20m long and the ball has a radius of 0.120mwith mass 0.380kg. What is ...
*February 27, 2008*

**pre-calculus**

solve for z writing the answer in polar form: #1 z=(3,115 degrees)*(4,290 degrees) #2 (8,50 degrees)* z=(6,172 degrees)
*February 20, 2008*

**physics**

i have one more How far does the train then travel while being slowed to a stop?
*February 20, 2008*

**physics**

The world record for the discus throw is 74.08m , set by Jürgen Schult in 1986.If he had been competing, not on earth, but on Mars, where the acceleration due to gravity is 0.379 what it is on earth, and if he had thrown the discus in exactly the same way as on earth, ...
*February 10, 2008*

**physics**

The world record for the discus throw is 74.08m , set by Jürgen Schult in 1986.If he had been competing, not on earth, but on Mars, where the acceleration due to gravity is 0.379 what it is on earth, and if he had thrown the discus in exactly the same way as on earth, ...
*February 9, 2008*

**physics**

A balloon carrying a basket is descending at a constant velocity of 20.0 m/s. A person in the basket throws a stone with an initial velocity of 15.0 m/s horizontally perpendicular to the path of the descending balloon, and 4.00s later this person sees the rock strike the ...
*February 9, 2008*

**biochemistry lab**

A) If you make up a solution of 50 mL of 0.1 M TRIS in the acid form, what will be the pH? B) If you add 2 mL of 1M NaOH to the solution in part A, what will be the pH? If it is needed, here is some addition information: TRIS pka= 8.3 mw of TRIS-HCL= 157.6 g/mol; mw TRIS (...
*February 2, 2008*

**Math**

t= -2 also because -5*-2 is positive 10. then you adda negivate two, and that gives you 12.
*January 13, 2008*

**Math**

t= -2
*January 13, 2008*

**law please check my answer**

True. she needs parental/gardian concence before the docter can do the surgery
*November 14, 2007*

**Law and Ethics in Med**

The defintion: i dont know if this will help you much but..... Insemination, homologous: A procedure in which a fine catheter (tube) is inserted through the cervix (the natural opening of the uterus) into the uterus (the womb) to deposit a sperm sample from the woman's ...
*November 11, 2007*

**Law and Ethics in med**

MEDICAL RECORD INFORMATION IS CONFIDENTIAL AND PRIVILEGED INFORMATION, AND IS LEGALLY PROTECTED FROM DISCLOSURE im not really 100% sure. im not majoring in medical stuff and would double check my answer. but i think thats corretct.
*November 11, 2007*

**social studies**

ok. About apartheid...I've learned that it was the legal separation of whites and blacks.
*October 16, 2007*

**social studies**

I don't have a text. i'm supposed to look it up online. i'm not sure-it would either be a good or bad reaction.
*October 16, 2007*

**social studies**

i hope it's ok if i post another question: How did the western nations respond to South Africa's apartheid system?
*October 16, 2007*

**social studies**

i'm really sorry to be impatient. is europe one of the nations, maybe?
*October 16, 2007*

**social studies**

i'm seeing french and british. No european?
*October 16, 2007*

**social studies**

thnx!
*October 16, 2007*

**social studies**

By 1914, what two nations controlled most of africa?
*October 16, 2007*

**Social Studies**

thanks I appreciate it.
*October 16, 2007*

**algebra**

simplify: square root of 5 + square root of 20 - square root of 27 + square root of 147. simplify: 6/4square root of 2 sqrt 5 + sqrt 20 - sqrt 27 + sqrt 147 = sqrt 5 + sqrt (4*5) - sqrt (3*9) + sqrt (49*3) = 3 sqrt 5 - 3 sqrt 3 + 7 sqrt 3 = 3 sqrt 5 + 4 sqrt 3 Your second ...
*August 3, 2007*

**algebra**

simplify (6x^3-16x^2+11x-5)/(3x-2) (3x-2)(2x-1)^2-3 my muliple choice is: a)6x^2-12x+3 -9 3x-2 b)2x^2-4x+1 -9 3x-2 c)2x^2-4x+1 -1 3x-2 d)x^2+8x-3 -9 3x-2 the 3x-2's are all under the last number. typo on b. the last number is 3 the signs are the same. im sorry for the ...
*August 3, 2007*

**algebra**

1)Simplify:(6x^3-16x^2+11x-5)/(3x-2) answer= 2x^2-4x+1-3over3x-2 2)Factor 27x^3-1 completley. answer= (3x-1)^3 if this isnt correct,im not sure how to solve it b/c this makes the most sense to me. 3)Simplify: x^2-3x-28 over x^2-9x+14,assume that the denominator is not equal to...
*August 2, 2007*

**someone help**

my post is still on this page as algebra, could someone elaborate on what bobpursley tried to help me with. See your original post. I am guessing you are referring to your question 5)Simplify:(5x-4)^2 and your answer= 25x^2 - 16 (5x-4)^2 =(5x-4)(5x-4) = 25x^2 - 20x - 20x + 16...
*August 1, 2007*

**algebra**

1)Simplify:(3x^0y^-4)(2x^2y)^3 answer=6x^6 over y 2)Simplify:2x^2y^5z^-4 over 8x^6yz^3 answer= y^4 over 4x^4z 3)Saturn is 1.4 x 10^9 kilometers away from the sun. If light travels 3.0 x 10^4 km per second,how long does it take light from the sun to reach saturn? Express the ...
*August 1, 2007*

**previous post**

has anyone read my 4 previous posts? I really need someone to check my answers. Please be patient, Erin. Our advanced math teachers are not online right now, it seems. =)
*July 28, 2007*

**Algebra 2(check pt 4)**

1)Cramer's Rule is used to solve the system of equations:3m-5n=12,4m+7n=-5 Which determinant represents the numerator for n? answer=[12 -5] [-5 7] 2)Cramer's Rule is used to solve the system of equations:3x-y+2z=17,4x+2y-3z=10,and 2x+5y-9z=-6 Which determinant ...
*July 28, 2007*

**Algebra(check pt 3)**

1)The dimensions of ST. S[7/12 -1/9] [-1/3 1/9] T[4 -5 2] [8 -1 3] answer=2x3 2)The pair of matrices that are inverses. P[3 1] Q[4 4] R[0 -1/4] [-4 0] [12 21] [1 3/4] S[7/12 -1/9] T[4 -5 2] U[-9 6 4] [-1/3 1/9] [8 -1 3] [-5 -2 3] V[3 1] [0 2] [-4 5] answer=S and R 3)Find the ...
*July 28, 2007*

**Algebra(check pt 2)**

1)The first row of -3T. T[4 -5 2] [8 -1 3] answer=[-12 15 -6] 2)The first row of 5P-Q. P[3 1] Q[4 4] [-4 0] [12 21] answer=[11 1] 3)The first row of TV. T[4 -5 2] V[3 1] [8 -1 3] [0 2] [-4 5] answer=not possible 4)The inverse of matrix R. R[0 -1/4] [1 3/4] answer=not possible
*July 28, 2007*

**Algebra2(check part 1)**

1)Solve the matrix:[2x] [14]for x [3y]=[12] answer=7 2)V[3 1] [0 2] [-4 5].The dimensions of matrix V. answer=3x2 3)The first row of T+U T[4 -5 2] U[-9 6 4] [8 -1 3] [-5 -2 3] answer=[-5 1 6] 4)The first row of V-T. V[3 1] T[4 -5 2] [0 2] [8 -1 3] [-4 5] answer=not possible 1...
*July 28, 2007*

**Math(check)**

1)Find the range of the relation [(-1,4)},(2,5),(3,5)}.Then determine whether the relation is a funtion. 4,5,5 is the range 4,5 is a function 2)Find f(-1),if f(x)= x^2-6x/x+2 (-1)^2-6(-1)/-1+2 1+6/-1+2 7/1 =7 3)Find f(a),if f(t)= 2t^2-t-2. 2(a)^2-a-2 2a^2-a-2 4)Which equation ...
*July 26, 2007*

**algebra 2**

This doesn't make ANY sense to me. The table shows the relationship between height and growing times for 8 plants of the same species. Use a scatter plot to determine which data point is an outlier. (15,6) (17,14) (20,18) (25,24) this is the table. Hours practiced:1,3,4,6,...
*July 26, 2007*

**algebra 2**

(a-y)+2y3,if a= 2 and y= -3 (2--3)2 + 2(-3)3 (5)2 + (-6)3 25 + -216 -191 either im wrong somewhere or my book doesnt have that answer my choices are -29,43,79,-53 I am assuming that by 2(-3)3 you mean 2(-3)3 you did not follow the order of operation which says exponents before...
*July 25, 2007*

**algebra 2**

evaluate:-[a-3b],if a= -2 and b= 6 -[-2-18] -[20] 20 correct? these are absolute bars by the way. No, not correct. |-20| is 20. Put a minus sign in front of it and you have -20. The error is made going from line 2 to line 3. but absolute is never negative There is a minus sign...
*July 25, 2007*

**Algebra 2(check) cont..**

1)solve the inequality -3(r-11)+15>_9 my answer = r<_13 2)solve the inequality -2<4z+10<_12 my answer = -3<z<_1/2 3)solve the inequality 2x-5<_10 or 33-4x<5 my answer is x<_15/2 or <7 4)solve the inequality 3(absolute bars m-4)>6 my answer is m...
*July 21, 2007*

**Algebra 2 (check)**

I have some problems that I've answered and I need someone to check to see if I'm right. Im just posting the questons and my answer,if its wrong I'll post my work,so here it is bear with me please and thank you. 1)name which sets of numbers to which -28 belongs. my...
*July 21, 2007*

**algebra 2**

solve the inequality: -3(r-11)+15> 9 _ this is as far as Ive gotten. -3r+33+15> 9 _ subtract 33, subtract 15 from each side. Now when you divide by -3, you have to reverse the inequality sign. Your answer will be r<something. r= <_ 13
*July 16, 2007*

**Algebra 2**

The formula A = 180(n-2)/n relates to the measure A of an interior angle of a regular polygon to the number of sides n. If an interior angle measures 120 degrees, find the number of sides A)5 B)6 C)8 D)10 I have NO clue on how to do this pls help. Make A equal 120 because A is...
*July 15, 2007*

**grammer**

does this sentence make sense? how can I make it better? A man determined to find love through the internet finds out that love is staring him in the face the whole time.Thanks How about this? Determined to find love through the Internet, a man finds that love is staring him ...
*July 12, 2007*

**MATH**

HHHHHEEEEEELLLLLLLPPPPPPPP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Find the y intercepts of these please: 1. The slope is: 6/2...3/1...3 2. The slope is: 10/2... 3. The slope is: 2/2...2 4. The slope is: 2/2...2 The formula for a slope intercept is: y = mx + b, where m is the ...
*May 24, 2007*

**MATH**

What type of coorelation does this haved) a middle school student's weight and height from birth to present--- NO COORELATION A correlation indicates the degree of linear relationship between two variables. A positive (+) correlation indicates that both variable increase (...
*May 24, 2007*

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | **6** | 7 | Next>>