# Posts by Samantha

Total # Posts: 1,675

**physics**

A 15kg box is resting on a hill forming an angle of a horizontal surface. The coefficient of static friction for the box on the surface is 0.45. Calculate the maximum angle of the incline just before the box starts to move.

*October 22, 2010*

**Math**

find all real and imaginary solutions x^(2/3)-2=x^(1/3)

*October 21, 2010*

**Physics**

Vo=0km/h V1=89 km/h t0=0 t1=6.1 89-0/6.1-0=14.5 km/hr (Round to 2 sig figs=15 km/hr) You then have to convert km/hr to m/s^2. 15km/hr * 1000m/3600s= 4.1m/s^2 3600s = 1hr *hope that helps

*October 21, 2010*

**Physics**

The toy car in figure 6-12 runs off the edge of a table that is 1.225-m high. The car lands 0.400m from the base of the table a.How long did it take the car to fall? b.How fast was the car going on the table?

*October 21, 2010*

**5th grade math**

C 87, because 522/6 is about 540/6=90

*October 21, 2010*

**College Physics**

Conceptual Question: Many people believe that a vacuum created inside a vacuum cleaner causes particles of dirt to be drawn in. Actually, the dirt is pushed in. Explain.

*October 19, 2010*

**English**

What is an explanation when someone says: "The our crime's worse than a murderer's. His act puts him outside the law, but keeps the law intact. Ours would weaken the law." P.s. These men are forming a posse to hang a gang that killed one of their townsmen.

*October 19, 2010*

**Chemistry 106**

Calculate number of moles of aluminum in 1.50kg of Al

*October 18, 2010*

**chemistry**

Calculate the number of moles of CaCO3 in 3.20g of Calcium Carbonate.

*October 18, 2010*

**chemistry**

Calculate number of moles of aluminum in 1.50kg of Al

*October 18, 2010*

**college algebra**

Shondra wants to enclose a rectangular garnden with 240 yards of fencing. What dimensions for the garden will maximize its area?

*October 17, 2010*

**Physics**

Force due to tension = mg + ma The force that the load originally has in addition to the force due to acceleration.

*October 17, 2010*

**Physics**

3240 N

*October 17, 2010*

**College Physics**

would the answer be 19200?

*October 17, 2010*

**College Physics**

so i do 2.0x10^5Pa x (0.024m^2)(4)??

*October 17, 2010*

**College Physics**

The four tires of an automobile are inflated to a gauge pressure of 2.0x10^5 Pa. Each tire has an area of 0.024m^2 in contact with the ground. Determine the weight of the automobile.

*October 17, 2010*

**Math**

can you help me on this problem? -15-(-4)+(-1)

*October 17, 2010*

**chemistry**

What element has 20 protons and forms a +2 Cation?

*October 15, 2010*

**Chemistry**

you are given the equation S2O3 + 2H --> S + SO2 + H2O you mix 25 ml of HCl with a concentration of 2 mol/L with 5 mL of Na2S2O3 with a concentration of 0.3 mol/L. what is the concentration of S2O3 and H?

*October 14, 2010*

**Chemistry**

A 30 ounce iron bar at 425 degrees Fahrenheit is placed in 2.00 quarts of water at 80.0 degrees Fahrenheit. What will be the change in temperature of the iron bar in degrees Fahrenheit? (Assume 1/3 heat lost to the surroundings) Specific heat of iron= .473 Joules/grams degrees...

*October 14, 2010*

**Chemistry**

Congratulations! You have discovered a new element called Bhauzium (Bz). The average atomic mass of Bz was found to be 348.72 amu and its atomic number is 123. a) if the atomic masses of three isotopes of Bhsuzium are 342.92 amu, 356.43 amu (6.52%), and 351.29 amu, what is the...

*October 14, 2010*

**College Physics!**

Is there any way i can just get these problems set up? I just need help with the steps on how to do it. A box weighing 600 N is pushed along a horizontal floor at a constant velocity with a force of 250 N parallel to the floor. What is the coefficient of Kinetic friction ...

*October 13, 2010*

**Chemistry 106**

An unidentified metal forms an ionic compound with the carbonate anion. The metal forms a 2+ cation. If the minimum ration of the number of protons in the metal to the oxygen protons s 5:6, what is the metal?

*October 13, 2010*

**algebra I**

What is 3/4x-7=8+-6x

*October 11, 2010*

**3rd grade**

it's 40 and it is in the tens place

*October 10, 2010*

**chemistry**

A solution contains 4.46 g KCl in 178 mL of solution. The density of the KCl solution is 1.11 g/ml. What is the percent (m/m) for the potassium chloride solution?

*October 9, 2010*

**chemistry**

how many milliliters of 6.00 M HCl are required to react with 60.0 ml of 1.96 M Al(OH)3? Al(OH)3(s)+3HCl(aq)-->AlCl3(aq)+3H2)(aq)

*October 8, 2010*

**math**

in square ABCD, the measure, in inches of AB is 3x+2 and BC is x+12. What is the number of inches in the length of DC ?

*October 4, 2010*

**science**

Your shadow will be longer if you are standing on a beach in Miami at 3pm because the sun is starting to set which alows your shadow to be longer than you and it will continue to get longer until the sun has fully set and when it rises again in the east it will become long again

*October 3, 2010*

**calculus**

Prove that cos(sin inverse x) = square root ( 1-x^2)

*September 29, 2010*

**calculus**

Prove that cos(sin inverse x) = square root ( 1-x^2)

*September 29, 2010*

**Physics**

a girl jumps off a high diving platform with a horizontal velocity of 2.77m/s and lands in the water 1.2s later the acceleration of gravity is 9.8m/s squared how high is the platform and how far from the base of the platform does she land?

*September 28, 2010*

**11th grade**

1.25/X = 82/100 82X = 124 82X/82 + 124/82 = X = 1.5424 Check: 0.01524 * 82 = 1.24968 = 1.25

*September 26, 2010*

**1st grade**

I am second grade and i got 37,000. I hope it is right

*September 23, 2010*

**Math**

If light travels 10,000 km in 3.3 x 10-2 sec, how long will it take light to travel one meter.

*September 21, 2010*

**Math**

I think its like this... 3 to the second power is 3x3 which equals 9, but 3x2 equals 6 which is multiplication and has nothing to do with the powers and stuff. Its kinda weird at first but you will get used to doing it right.Another example is 3 to the 5th power. 3x3x3x3x3. ...

*September 21, 2010*

**english**

we are doing one about how to kill a mocking bird (the book was really good)

*September 21, 2010*

**english**

i am doing a book report and i havent done one since the 5th grade and now i am in 7th HELP!!!!!!!!!!!!!!!!!!!!!!!!!

*September 21, 2010*

**english**

that means if you do something good for someone later on you will rewarded

*September 21, 2010*

**Chemistry**

Well Ms. Sue, both Johannie and I were using this computer and I didn't realize her name was still on the name line.

*September 20, 2010*

**Chemistry**

The solution forms because of that?

*September 20, 2010*

**Chemistry**

The lattice energy is greater in magnitude than the heat of hydration. but what about the Last question?

*September 20, 2010*

**Chemistry**

When ammonium chloride is dissolved in water, the solution becomes colder. What can you say about the relative magnitudes of the lattice energy of ammonium chloride and its heat of hydration? Why does the solution form? What drives the process?

*September 20, 2010*

**7th grade**

well pretend that you and you sis or brother were spliting the last cookie in half soo the earth is the cookie and the hemisphere is half of the earth.

*September 20, 2010*

**7th grade**

my teacher is making us do a current even outside of the us and i STILL can't find a good curren event

*September 17, 2010*

**math**

18x^2 minus x minus 4 simplified.

*September 13, 2010*

**Intermediate Algebra**

Evaluate the exponential function for three positive values of x, three negative values of x, and at x=0. Show your work. Use the resulting ordered pairs to plot the graph; State the domain and the range of the function. f(x) = e^x

*September 10, 2010*

**Intermediate Algebra**

Evaluate the exponential equation for three positive values of x, three negative values of x, and at x=0. Transform the second expression into the equivalent logarithmic equation; and evaluate the logarithmic equation for three values of x that are greater than 1, three values...

*September 10, 2010*

**Geometry**

In geometry what kind of algebra do you use?

*September 10, 2010*

**Intermediate Algebra**

Hello I need a little help with my homework. I started trying to work it out but I am not sure if it is the correct solution. Please help! Question: Population growth. The exponential growth rate of the population of United Arab Emirates is 4.4% per year (one of the highest in...

*September 10, 2010*

**math**

The atomic number of cadium is half the atomic number of curium. Define a variable and write an expression for the atomic number of cadmium. I'm working in a group with my friends and we need help we're not the same people.

*September 8, 2010*

**math**

The atomic number of cadium is half the atomic number of curium. Define a variable and write an expression for the atomic number of cadmium. I'm working in a group with my friends and we need help we're not the same people.

*September 8, 2010*

**English**

I'm sorry-I needed to know what the theme was Thank you

*September 8, 2010*

**English**

What is the main idea of this? Please help-I'm terrible in english- Five score years ago, a great American, in whose symbolic shadow we stand today, signed the Emancipation Proclamation. This momentous decree came as a great beacon light of hope to millions of Negro slaves...

*September 8, 2010*

**Math**

Evaluate the logarithmic equation for three values of x that are greater than 1, three values of x that are between 0 and 1, and at x=1. Show your work. Use the resulting ordered pairs to plot the graph. State the equation of the line asymptotic to the graph (if any). y= log 1...

*September 6, 2010*

**science**

what is iit

*September 2, 2010*

**science**

A team of 6 scouts plans to cross a lake on a raft they designed. The scouts have wooden beams with an average relative density of 0.80. The beams measure 30cmx30cmx3m. The average scouts' mass is about 65kg and for their safety, they want the top of the raft to be at ...

*September 2, 2010*

**science**

During a competition, a 60kg cyclist rides along a horizontal road on a bike with a mass of 5kg. During her ride, she changes gears and uses the chain wheel with a radius of 7.5cm and 36 teeth, and the rear sprocket with 18 teeth. The pedal handle is 20 cm in length. a) ...

*September 2, 2010*

**math**

what is 7 to the 11th power equvilant to

*August 31, 2010*

**british literature**

1. Determine the speaker's attitude in thee lines: "Lo, all our pomp of yesterday/is one with Nineveh and Tyre!" a. the speaker feels Britain's greatness is similiar to that of ancient cities. b. The speaker believes the greatness of Britain could disappear, ...

*August 18, 2010*

**health information management technology**

This is supposed to be 500-700 words long :(

*August 13, 2010*

**Algebra**

Thanks so much

*August 5, 2010*

**Algebra**

Area of a painting. A rectangular painting with a width of x centimeters has an area of x^2+50x square centimeters. Find a binomial that represents the length. See the accompanying figure.

*August 5, 2010*

**Year 12 Biology**

What is a good and easy experiment I could do for my Year 12 biology assignment? I was thinking something with alcohol and the human body but I wouldn't know what my hypothesis would be. HELP!!

*July 30, 2010*

**sheltered content instruction**

Discuss what level of cognitive demand and context is represented by a student who performs each of the folowwing activities

*July 23, 2010*

**Physic Check**

CORRECT p.s sorry for the misspelling.

*July 12, 2010*

**Physic Check**

Okay when it comes down to ariel. you are INCORRECT .

*July 12, 2010*

**chemistry**

with the numbers 3, 7, 10 & 12 how you you make up the number 800 using different functions?

*July 10, 2010*

**chemistry**

4.The Kb of ammonia, NH3, is 1.8x10^-5. What is the pH of a 2.000 millimolar solution of ammonia , to 3 significant digits.

*July 6, 2010*

**chemistry**

Sorry I had a moment! I didn't process before I typed!

*June 23, 2010*

**chemistry**

Thank you! Can you explain to me where the 0.25 comes from?

*June 23, 2010*

**chemistry**

The equilibrium constant for the following reaction is 5.0 at 100c. If an equilibrium mixture contains [No2]=0.50 M, what is the [N2O4]? 2No2(g) <--> N2O4 (g) I do not understand if the Kc is 100c or where that plays in!

*June 23, 2010*

**chemistry**

Okay so for example P4(g) + 5O2(g) <==> P4O10(s) that would go to the right?

*June 22, 2010*

**chemistry**

Can anyone explain Le Chatelier's principal? How you know when it shifts to the products and reactants? Such as in 3O2(g) --><-- 2O3(G) 2CO2(g) --><-- 2CO(g) + O2 Thanks!!

*June 22, 2010*

**chemistry**

thanks for all this help! so for this one, 1 - it would be 0.108 x 35.7 = 3.86 moles of Na2CO3 2 - 2.86 moles Na2CO3 / 2 Moles HNO3 = 1.93 Moles HNO3. 3 - 1.93 Moles HNO3 x 0.150 M HNO3 = 0.290 L which would equal 290 mL. Is this the final solution? 4 - I need help with this ...

*June 21, 2010*

**chemistry**

what volume (in ML) of a 0.150 M HNO3 solution is required to completely react wtih 35.7 mL of a 0.108 M Na2CO3 solution according to the following balanced chemical equation? Na2CO3(aq) + 2 HNO3(aq) --> 2NaNO3(aq) + H2O(l) then, in the reaction above, what mass (in grams) ...

*June 21, 2010*

**chemistry**

my teacher insists that we do it that way, i don't really understand it but i try! so it would come out to be 0.026 moles Pb(NO3)2. Then, converting Pb(NO3)2 into KCl it would come out to be 0.052 Moles KCl. Then divide 0.052 by 0.150 which would equal 0.15 L?

*June 21, 2010*

**chemistry**

okay so the solution would be. 0.150 M KCl x 0.175 M Pb(NO3)2/ 1 M KCL x 0.150 L/0.175 M Pb(NO3)2 = 0.023 L?

*June 21, 2010*

**chemistry**

what volume (in L) of 0.150 M KCl solution is required to completely react with 0.150 L of a 0.175 M Pb(NO3)2 solution according to the following balanced chemical equation? 2KCl (aq) + Pb(NO3)2 (aq) --> PbCl2 (s) + 2 KNO3 (aq)

*June 21, 2010*

**Finance**

Newdex has net income of $2,500,000 and 1,000,000 shares outstanding. It needs to raise $3,610,000 in funds for a new asset. Its investment banker plans to sell an issue of common stock to the public for $40 per share, less a spread of 5%. How much must Newdex's after-tax ...

*May 14, 2010*

**chemistry**

How much heat is evolved when 1258 g of water condenses to a liquid at 100.°C?

*May 10, 2010*

**chemistry**

How much heat is evolved when 269 g of ammonia gas condenses to a liquid at its boiling point?

*May 10, 2010*

**Economics**

What are some national fiscal policies that can affect mortgage rates, housing starts, and housing prices?

*May 7, 2010*

**poetry**

I need a poem with the rhym scheme ABABCC

*May 5, 2010*

**physics**

wouldn't the gravitational attraction stay the same and be 6.67 E -11 N*m2/kg2 as stated in the equation? I'm sorry I'm having a really hard time with this

*April 21, 2010*

**physics**

Gravitational force of attraction “F” exists between two point masses A and B when a fixed distance separates them. After mass A is doubled and mass B is quartered, the gravitational attraction between the two masses is

*April 21, 2010*

**physics**

A 5.0 N force directed to the west acts on an object for 2.0 seconds. What is the change in momentum of the object? Do I have to divide 5.0 by 2.0 in order to get the momentum or multiply?

*April 21, 2010*

**Chemistry**

Which aqueous solution has a freezing point closer to its predicted value 0.01 m NaBr or 0.01 m MgCl2?

*April 21, 2010*

**college**

Jake, you are right. I figured out the answer of 2/3 also.

*April 21, 2010*

**math**

Vanessa, the answer should be 288cm. for the surface area all you do is multiply lenght width and height

*April 21, 2010*

**Algebra1**

I am solving for linear equations and I'm wondering if I did Step 3 right.. 3x-y=8 x-y=8 Step 1 3x-y=8 3x-y+y=8+y 3x=8+y 3x/3=8+y/3 x=(8+y/3) Step 2 3(8+y/3)-y=8 8+y-y=8 8+2y=8 8+2y-8=8-8 2y=0 2y/2=0/2 y=0 Step 3 x=8+y(0)/3 x=2.6

*April 18, 2010*

**Economics - stock purchase**

Can someone please help me? I am so confused! My homework is called stock purchase and I need to find some information abut three stocks. I'm starting with microsoft. The first three questions are the stock name, symbol, and address of the headquarters. But after that it ...

*April 15, 2010*

**Math**

How to solve x^6 3x^3 2=0

*April 15, 2010*

**Finance**

If I had put 50,000 dollars away today in some kind of cd or money market account, and did not touch it or the interest for 20 yrs, how much money would I have, same ? with 80,000 please help

*April 15, 2010*

**Physics**

I thought to reduce the frequency of a particle, you would have to decrease the speed. no?

*April 4, 2010*

**science**

Im confused though, it says three lines result from transitions to the nf=2, which three lines?

*April 1, 2010*

**science**

Five lines in the H atom spectrum have the following wavelengths in Ǻ: a). 1212.7, b). 4340.5, c). 4861.3 d). 6562.8 and e). 10938. Three lines result from transitions to the nf = 2. The other two result from transitions in different series, one with nf = 1, and the other...

*April 1, 2010*

**science**

Five lines in the H atom spectrum have the following wavelengths in Ǻ: a). 1212.7, b). 4340.5, c). 4861.3 d). 6562.8 and e). 10938. Three lines result from transitions to the nf = 2. The other two result from transitions in different series, one with nf = 1, and the other...

*April 1, 2010*

**Physics**

Light travels in a line of optical fiber by total internal reflection between a core of refractive index 1.48 and a cladding 1.46 refractive index. The critical angle for total internal reflection to occur inside the core of the fiber is ... 80.6º 48.8º 43.2º ...

*March 21, 2010*

**Physics**

The refractive index of a medium changes with the wavelength of incident light. Typically, the shorter the wavelength the larger the refractive index. Fused quartz has a refractive index of 1.47 for indigo light of 400 nm in wavelength, and a refractive index of 1.46 for green...

*March 20, 2010*