Saturday

June 25, 2016
Total # Posts: 1,097

**Chemistry**

PLease Help me!!!!!!!!!!!
*February 18, 2013*

**Chemistry**

Help!!!!!!!!!!!! Fe + CuSO4 --> Cu + FeSO4 2.05g 7.00g 2.46g 151.8g Which reactant was limiting and how does this chemical equation support this? The numbers beneath the names are the masses in grams.
*February 18, 2013*

**Physics**

You first have to find the acceleration of what is given. F1 has force of +8.0N, and box has mass of 4.7kg. F = ma, so 8.0/4.7 is 1.7m/s2. Now to view the other question, you'd use the same equation only this time, you need to use the newly acquired acceleration from above...
*February 13, 2013*

**math**

75%? Who is Jessica?
*February 7, 2013*

**math**

Find the % of Discount Regular Price $25,000 Sale Price $22,000
*February 7, 2013*

**Math**

Now how would I do this? This is so confusing. LUNCH You bought 3 pieces of chicken that cost x dollars each, a salad for $3, and a drink for $1.
*February 5, 2013*

**Math**

4(y-3)+9-3y I come out and get 4y-12+9-3y What do I do now? I'm so confused! I don't know it !:(
*February 5, 2013*

**Math**

Hello! I am needing some help on Algebra! It is hard ! Can you explain how to Simplify Algebraic Expressions? The easiest way? I have a test over it Friday, and i can't understand it at all! Can you help with these and explain? -12z+4(z-9)+30+z and 4(y-3)+9-3y
*February 5, 2013*

**chemistry**

would the ratio of moles of Cu:moles of CuCl2 differ from atoms of Cu:formula units of CuCl2? Why or Why not?
*February 5, 2013*

**Spanish**

1) B 2)C 3)B 4) B
*February 4, 2013*

**Science**

Hello Steve. I have another question... why is Meiosis important?
*February 4, 2013*

**math**

Thank u. Can you also help me at -19 (v-1)
*February 4, 2013*

**math**

It was supposed to be (-32-s)(-9). I copied it wrong, Sorry Steve!
*February 4, 2013*

**math**

(-32)-s (-9) I am not good at algebra. I am supposed to use the distributive property, but not sure where to begin.
*February 4, 2013*

**Math **

$45 at 2% for 5 years
*January 22, 2013*

**Math **

$45 at 2% for 5 years
*January 22, 2013*

**Alegbra**

Find the range of the relation [(1, -4), (2,5), (3,5)]. Then determine whether the relation is a function.
*January 17, 2013*

**chemistry**

What is the molarity of an HCl solution if 38.5 mL of it is titrated to the equivalence point with 41.6 mL of a 1.41 M NaOH solution?
*January 13, 2013*

**math**

how can you use a right angle to decide how to name another angle?
*January 8, 2013*

**geometry **

the endpoints of the diameter of circle O are (-2,-1) and (-16,13). what are the coordinates of its center?
*January 8, 2013*

**physical science**

When iron metal reacts with oxygen, the reaction can form Fe2O3. Write a balanced chemical equation for this reaction, and find the number of moles of oxygen that are needed to form 6 mol of Fe2O3. Show your work.
*January 7, 2013*

**pre-algebra**

Kiron invests $22,700 at 14% simple interest. About how much interest will he earn in 6 months
*December 22, 2012*

**Chemistry**

When 100 mL of Ba(NO3)2 solution at 25 degrees Celsius is mixed with 100 mL solution CaSO4 solution at 25 degrees Celsius in calorimeter, the white solid BaSO4 forms and the temperature of the mixture increases to 28.1 degrees Celsius. Assuming that the calorimeter absorbs ...
*December 9, 2012*

**Chemistry**

Explain in step by step and provide calculations to show how you can prepare 1.50 L of 0.10 M H2SO4 solution starting with 16 M H2SO4
*December 9, 2012*

**Physics**

An object weighing 400.0g in air is immersed in water after being tied to a string connected to a balance. The scale now reads 364.6g. a.) Find the loss of weight(in gram of weight) when completely submersed in water. b.) Find the volume of the object in cm^3 and in m^3. c.) ...
*December 5, 2012*

**Physics- Elena please help!**

A 60.00 cm guitar string under a tension of 46.000 N has a mass per unit length of 0.11000 g/ cm. (a) What is the speed of the wave? (b) What is the fundamental wavelength for this string? (c) What is the fundamental frequency for this string? (d)What is the highest resonant ...
*December 3, 2012*

**Physics- Someone Please Help!!!**

A 60.00 cm guitar string under a tension of 46.000 N has a mass per unit length of 0.11000 g/ cm. (a) What is the speed of the wave? (b) What is the fundamental wavelength for this string? (c) What is the fundamental frequency for this string? (d)What is the highest resonant ...
*December 3, 2012*

**Physics- PLEASE HELP**

A 60.00 cm guitar string under a tension of 46.000 N has a mass per unit length of 0.11000 g/ cm. (a) What is the speed of the wave? (b) What is the fundamental wavelength for this string? (c) What is the fundamental frequency for this string? (d)What is the highest resonant ...
*December 3, 2012*

**Physics- PLEASE HELP**

A 60.00 cm guitar string under a tension of 46.000 N has a mass per unit length of 0.11000 g/ cm. (a) What is the speed of the wave? (b) What is the fundamental wavelength for this string? (c) What is the fundamental frequency for this string? (d)What is the highest resonant ...
*December 2, 2012*

**Intermediate Algebra**

what is 2x to the second power equals 54
*December 1, 2012*

**math**

Thanks!
*November 5, 2012*

**math**

The election results indicate that 131.2 million Americans voted in the 2008 presidential election. This was approximately 63% of the eligible voters. How many Americans were eligible to vote in the election?
*November 5, 2012*

**science**

Betty is sledding down a hill going 12 m/s. She hits a very steep patch and starts to speed up 1.5 m/s2. How fast will Betty be moving 2 seconds later?
*October 25, 2012*

**Physics- Elena please help!**

I'm not getting the right values! I think they are too large, can you tell me what you are getting so I can try and figure out where I am going wrong!
*October 18, 2012*

**Physics- Elena please help!**

(b)What was the speed of the bullet at impact with the block?
*October 18, 2012*

**Physics- Elena please help!**

A 20.0 g bullet is fired horizontally into a 85 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 156 N/m. The bullet becomes embedded in the block. The bullet block system compresses the spring by a ...
*October 18, 2012*

**Physics- PLEASE HELP**

A 58.0 kg soccer player jumps vertically upwards and heads the 0.45 kg ball as it is descending vertically with(b) If the ball is in contact with the players head for 19 ms, what is the average acceleration of the ball? a speed of 26.0 m/s. If the player was moving upward with...
*October 17, 2012*

**Physics**

Ann, a 66.1 kg person throws a 0.0460 kg snowball forward with a ground speed of 31.7 m/s. Billy, with a mass of 60.5 kg, catches the snowball. Both people are on skates. Ann is initially moving forward with a speed of 2.29 m/s, and Billy is initially at rest. After the ...
*October 17, 2012*

**Physics**

A man claims he can safely hold on to a 12.80 kg child in a head-on collision with a relative speed of 133. mi/h lasting for 0.100 s as long as he has his seat belt on. (a) Find the magnitude of the average force needed to hold onto the child.
*October 17, 2012*

**Physics URGENT!!!**

Thank you!
*October 17, 2012*

**Physics URGENT!!!**

Can you give me the values so I can compare, I don't think I am getting the right values!
*October 17, 2012*

**Physics URGENT!!!**

A 75.0 kg fullback running east with a speed of 6.00 m/s is tackled by a 82.0 kg opponent running north with a speed of 5.00 m/s. (a) Calculate the velocity of the players immediately after the tackle. (b)Calculate the direction of the players immediately after the tackle.(c)...
*October 17, 2012*

**Physics- Elena please help!**

A 20.0 g bullet is fired horizontally into a 85 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 156 N/m. The bullet becomes embedded in the block. The bullet block system compresses the spring by a ...
*October 16, 2012*

**Physics HELP!**

A 20.0 g bullet is fired horizontally into a 85 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 156 N/m. The bullet becomes embedded in the block. The bullet block system compresses the spring by a ...
*October 16, 2012*

**Math. test tomorrow. help!**

In 1960, the population was 291000. In 1970, the population was 480000. Assuming exponential growth, what is the annual percent rate? and doubling time? The answers are 5.13% and 14 years. I do not know how to get this though :( Please help!
*October 14, 2012*

**please help. Test tomorrow**

thanks:)
*October 14, 2012*

**Math. Increases**

Please help! test tomorrow
*October 14, 2012*

**Math. Increases**

In 1960, the population was 291000. In 1970, the population was 480000. Assuming exponential growth, what is the annual percent rate? and doubling time? The answers are 5.13% and 14 years. I do not know how to get this though :( Please help!
*October 14, 2012*

**Statistics**

500
*October 14, 2012*

**Math**

On his 13th birthday he was 112 cm tall and on his 14th birthday he was 121cm tall. Assume a geometric monthly growth rate. What is this rate? (%)
*October 13, 2012*

**statistics - probability**

Get a study group. loser
*October 12, 2012*

**Algebra**

Nevermind...Already got an answer!
*October 9, 2012*

**Algebra **

A natural food store makes its own brand of trail mix out of dried apples, raisins, and peanuts. One pound of the mixture costs 3.18. It contains twice as much peanuts by weight as apples. One pound of dried apples cost $4.48, a pound of raisins costs $2.40, and a pound of ...
*October 9, 2012*

**Chemistry**

Write a net ionic equation for the reaction that occurs when aqueous solutions of potassium hydroxide and nitrous acid are combined.
*October 8, 2012*

**Chemistry**

Write a net ionic equation for the reaction that occurs when aqueous solutions of hydroiodic acid and barium hydroxide are combined.
*October 8, 2012*

**Physics**

A boater wants to head straight across a river that has a current of 3km/hr. If the top speed of the boat in still water is 4km/hr, find the direction the boat must travel into the current to go straight across the river. How fast is the boat going straight across the river?
*October 6, 2012*

**Physics URGENT!!!**

Can you give me the values you got so I can compare my answers to make sure I did this right?
*October 5, 2012*

**Physics URGENT!!!**

A sled loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope inclined at 40.0o above the horizontal. The sledge moves a distance of 16.0 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.510...
*October 5, 2012*

**Chemistry**

What can be concluded about Volume in milliliters per celsius, and volume in milliliters per kelvin?
*October 4, 2012*

**Physics- Elena please help!**

Two blocks each of mass 3.38 kg are fastened to the top of an elevator as in the figure. (b) If the strings can withstand a maximum tension of 87.8 N, what maximum acceleration can the elevator have before the first string breaks?
*October 3, 2012*

**Science**

Calculate the molarity of a solution formed using 55.4 g of AgNO3 in enough water to form 250 ml of solution.
*October 1, 2012*

**physics**

A woman with a mass of 41 kg runs at a speed of 7 m/s and jumps onto a giant 30 kg skateboard initially at rest. What is the combined speed of the woman and the skateboard?
*September 26, 2012*

**math**

A rectangle is 4 inches longer than it is wide and has an area of 165 square inches. Find its dimensions
*September 25, 2012*

**physics**

if an egg is thrown at an initial height of 1.9m and lands 2.09s later at 19m what is the velocity at which the egg was thrown and the velocity with which it lands
*September 24, 2012*

**history**

im still on the introduction paragraph i can work on the 3 body paragraphs i just need the intorduction so i can move forward
*September 23, 2012*

**history**

I need help doing my introduction paragraph for my essay Describe the effects of the growth of Protestantism, and its development on: a)Settlement patterns in america b)the development of early american society c) the development of early American politics/government
*September 23, 2012*

**History**

what could the thesis be thats what im stuck
*September 23, 2012*

**History**

i need help starting it. its a essay prompt
*September 23, 2012*

**History**

Examine the three themes of the renaissance (humanism. the critical spirit and empiricism). In what ways are these themes reflected in the development of american society between 1660 and 1750?
*September 23, 2012*

**grade six math**

7933333.00
*September 13, 2012*

**Physics**

a steel ball drops onto a thick steel plate. its speed just before it hits is 10 m/s and it rebounds with a speed of 9 m/s. what percentage of its kinetic energy did it lose during the collision? what would you expect its speed to be after the second rebound?
*September 6, 2012*

**math**

Is the the value of the 4 4,000?
*September 5, 2012*

**Chemistry**

What is the density of a copper block that is 8.96g/cm^3 in ounces/pint? I did all the conversions and the answer I got was 150ounces/pint? Is this correct? How to I solve this problem?
*September 4, 2012*

**Math**

Ayeshe was given 3 clues concerning the value of a mystery fraction. The clues she was given are shown below. 1) I am a fraction between 1/5 and 1/4 2) My numerator is a prime number less than 10. 3) My denominator is 10 more then my numerator. What is the mystery fraction? ...
*September 4, 2012*

**physics**

This is the question to one of my physic problem. A person standing outside their house is passed by a runner heading West at a steady pace of 3.3 m/s. Right when the runner passes by, the person accelerates towards the south at a rate of 0.36 m/s2 for 1.2 seconds. Determine ...
*August 30, 2012*

**physics**

This is the question to one of my physic problem. A person standing outside their house is passed by a runner heading West at a steady pace of 3.3 m/s. Right when the runner passes by, the person accelerates towards the south at a rate of 0.36 m/s2 for 1.2 seconds. Determine ...
*August 30, 2012*

**math**

so i got a math work sheet and i cannot figure out the math puzzle and to get the answer you have to do the work but i need help. Does anyone know what the answer to what did the spanish farmer say to his chicken is?
*August 21, 2012*

**Social Studies**

Near what type of physical feature was most of the earliest farming villages built?
*August 20, 2012*

**health**

Me toooooo lol
*August 11, 2012*

**consumer math**

The Mannings file a tax return showing $125000 in earned income, $3288 from interest income, and they have a tax credit of 1% of their earned income. They claim 5 exemptions of $2500 each, one head of household exemption of $10500, pre-tax medical deductions of $125 weekly, ...
*August 9, 2012*

**chemistry**

You are given 50 mL of .25 M citric acid. How many moles of NaOH would you need to add to obtain a soln with a pH of 6.7? Assume volume unchanged Ka1=7.4E-4 Ka2=1.7E-5 Ka3=4E-7
*July 26, 2012*

**Chemistry**

work out the [OH-], [H+] and pH of the solution formed when 0.500L of 0.250 M hydrochloric acid solution is mixed with 0.500 L of a 0.250 M calcium hydroxide solution.
*July 22, 2012*

**Physics**

A 20 N force acts on a 10 kg object parallel to the object's displacement. If the force acts for 32 m, what is the final kinetic energy, in J, of the object assuming it starts from rest?
*July 2, 2012*

**Physics**

The work done on an object by the gravitational force is 28 J. What is the change in the gravitational potential energy of the object?
*July 2, 2012*

**Physics**

From your intergalactic survey base, you observe a moon in a circular orbit about a faraway planet. You know the distance to the planet/moon system, and you determine the maximum angle of separation between the two and the period of the moon's orbit. Assuming that the moon...
*June 10, 2012*

**Physics HELP!**

An ant and a beetle are riding a spinning record on a record player. The ant stands on the outside edge of the record while the beetle stands on the record's label. The ant is four times as far from the center of rotation as the beetle. What is the ratio of the ant's ...
*June 3, 2012*

**Physics help?**

Nitrogen gas molecules, which have mass 4.65×10−26 kg, are striking a vertical container wall at a horizontal velocity of positive 440 m/s. 5.00×1021 molecules strike the wall each second. Assume the collisions are perfectly elastic, so each particle rebounds...
*June 2, 2012*

**Physics**

Sam tosses a ball horizontally off a footbridge at 4.3 m/s. How much time passes after he releases it until its speed doubles? Can someone please explain the correct equation to use thoroughly and help me to find the correct answer?!
*May 25, 2012*

**Chemistry**

Enthalpy changes: H2O2(l) ----> H2O(l) + 1/2P2(g) delta H= -94.6kJ H2(g) + 1/2O2(g)----> H2O2 delta H= -286.0kJ Calculate the value on delta H for the reaction: H2(g) + H2O2(l)----> 2H2O(l)
*May 19, 2012*

**physics**

you take 250.0 g of ice from the refrigerator at -8.00 degrees celsius. how much heat does it take to warm it to room temperature, 20.0 degrees celsius?
*May 13, 2012*

**11TH Geometry**

With the image of O(-2,-1) after 2 reflections. one across the line y=-5 and line x=1
*May 12, 2012*

**Chemistry**

2Na+F2=2NaF if 20.0 g of sodium is used what mass of sodium fluoride could be produced assuming that fluorine gas is unlimited
*May 1, 2012*

**chemistry**

2C2H6+702=4CO2+6H20 how many grams of oxygen are required to completely burn60.0g ethane (C2H6) show work Using the above equation how many Lof 02 are required to burn 20.0Lof ethane thank u soo much this is for a test
*May 1, 2012*

**chemistry**

Mg(ClO32=MgCl2+3O2 12.omolMg(ClO3)2produces molMgCl2and MolO2 3.00 molofMg(ClO3)2produces what mass of O2
*May 1, 2012*

**SOCIAL STUDIES URGENT**

THANKS MALUM!!!!!!
*April 30, 2012*

**ALGEBRA**

first off, I like to circle to common ones... so I first circle the two x's. Since we are subtracting, it would be x-x which is 0. Thenm i circled the 2y's. It would be 2y - (-2Y) aka 2y +2y which is 4y. Then, -2z-2z which is -4z. it would be 0+4y-4z and you obviously ...
*April 25, 2012*

**chemistry**

How many moles of ions are contained in 1.4 L of a 1.6 M solution of Mg(NO3)2?
*April 24, 2012*

**chemistry**

How many moles of ions (cations and anions) are contained in 1.2 L of a 1.9 M solution of KCl? KCl K+ + Cl-)
*April 24, 2012*

**chemistry**

What is the molarity of each kind of ion in a solution of magnesium chloride that contains 29.0 g of magnesium chloride dissolved in enough water to make 1.73 L of solution? MgCl2 Mg2+ + 2 Cl-
*April 24, 2012*

**ap chemistry**

A voltaic cell made of a Cr electrode in a solution of 1.0 M in Cr 3+ and a gold electrode in a solution that is 1.0 M in Au 3+ . a) Provide the half cell reactions for each of the electrodes. b) Which is the anode and which is the cathode? How did you decide? c) Give an ...
*April 17, 2012*