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September 2, 2014

Posts by brittany


Total # Posts: 831

Chemistry
Describe how to prepare an aqueous 100 mL stock solution of 2 M sodium chloride solution.
March 22, 2011

physics
A car traveling at 26 m/s undergoes a constant decleration of 12 m/s^2. About how long di=oes it take the car to come to a stop?
March 11, 2011

perimeter and area
hvhj
March 9, 2011

spanish
True
March 6, 2011

College Physics
Vector A points in the negative y direction and has a magnitude of 6 units. Vector B has twice the magnitude and points in the positive x direction. Find the direction and magnitude of vec A-B and Vec B-A?
March 2, 2011

Calc
"Let f(x,y)=2(x^2)y-(y^3)+x-4. a) Find the local linearization of f at (3,1) b) Compute the directional derivative of f at (3,1) in the direction towards the point (-2,3). At (3,1), is the function f increasing or decreasing in the direction towards the point (-2,3)? Give...
March 1, 2011

Calc
The temperature at any point in the plane is given by the function T(x,y)= 100/(x^2+y^2+1). Find the direction at the point (3,2) in which the temperature does not increase or decrease. Help, please? Thanks!
February 28, 2011

Calc
The question that I'm stuck on is this: "Let f(x,y)= x^(2)*ln(y). Find the average rage of change of f as you go from (3,1) to (1,2) and find the instantaneous rate of change of f as you leave the point (3,1) toward (2,1)." Any help would be appreciated. Thanks!
February 27, 2011

Calc: Difference quotients
"Use difference quotients with delta(x)=0.1 and delta(y)=0.1 to estimate fx(1,3) and fy(1,3) where f(x,y)=e^(-x)sin(y)." I don't know how to solve this problem. Could someone walk me through it? Thank you so much!
February 27, 2011

chemistry
What is the pH of a solution prepared by dissolving 7.5g HCl in water to make 375mL of solution?
February 27, 2011

physics
A water balloon dropped from a dorm window does not break on impact. From what height would you need to drop the balloon to double the speed of the balloon?
February 25, 2011

math
a river flows at 2km/hr and sarah takes 6 hrs to row 16km up the river and 16km back.how fast did she row?
February 23, 2011

5th grade math
the johnsons has ben verry bussy and havet done laundry in several weeks the dirty cloth pile hase 540 cloths they figur they can put 27 pices of clothing in a singal load. how many loads of laundry will the johnsens family to do to wash all the itams of clothing
February 15, 2011

sciene
A kid applies a force of 70 N to a ball over 1.1 meters. How much work did he do on the ball?
February 9, 2011

Chemistry
Thanks. Would it matter which molarity I use if I used M1V1 = M2V2
February 5, 2011

Chemistry
How do I find the molarity of Fe(SCN)2+? I know the molarity of SCN=0.1 and the molarity of Fe is 0.0001. The volume of SCN is 5 mL and the volume of the Fe is also 5mL. I also think that I use M1V1=M2V2.
February 5, 2011

Chemistry
How many moles of dinitrogen pentoxide are needed to produce 1.25 moles of nitric acid?
February 3, 2011

Chemistry
How many moles of nitric acid will be produced when 0.35 moles of water reacts?
February 3, 2011

math
In a gift wrapping department, a customer can choose from x different papers, y different ribbons, and z different greeting cards. There are 160 different paper, ribbon, and greeting card combinations possible. List three of the possible combinations. Need help...please.
February 2, 2011

math
The third and seventh terms of an arithmetic sequence are 10 and 20. 1) What is the value of the 1st term? 2) What is the value of the 9th term? 3) What is the equation to find the nth term in the sequence? HELP!! PLEASE!!
February 2, 2011

Chemistry 1
How many grams of a stock solution that is 92.5 percent H2SO4 by mass would be needed to make 250 grams of a 35.0 percent by mass solution? Can you please teach me how to do this? I get the other stoichiometry stuff, but this one tripped me up because I don't know how to ...
February 1, 2011

chemistry
A 0.100 mol sample of H2S is placed in a 10.0 L reaction vessel and heated to 1132°C. At equilibrium, 0.0285 mol H2 is present. Calculate the value of Kc for the reaction below at 1132°C. 2 H2S(g) 2 H2(g) + S2(g)
January 31, 2011

Calculus
A particle moves at varying velocity along a line and s=f(t) represents the particle's distance from a point as a function of time, t. Sketch a possible graph for f if the average velocity of the particle between t=2 and t=6 is the same as the instantaneous velocity at t=5...
January 29, 2011

Chem
What would be the resulting molarity of a solution made by dissolving 21.9 grams of KCl in enough water to make an 869-milliliter solution?
January 27, 2011

Calc
lim as x --> infinity of (x^2-16)/(x-4) is 8 By graphing, find an interval for near zero such that the difference between your conjectured limit and the value of the function is less than 0.01. In other words, find a window of height 0.02 such that the graph exits the sides...
January 25, 2011

physics
Can you help me with this one also? I know how to do it with 3 vectors but I can't seem to draw it with 4 vectors. The magnitudes of the four displacement vectors shown in the drawing are A=16.0 m, B=11.0 m, C=12.0 m, and D=26.0 m. Determine the (1) magnitude and (2) ...
January 23, 2011

need help
i'm in the 4th grade i need a socialstudy project to do rightnow i cant seam to think of anything can you help me please and thankyou
January 23, 2011

physics
A person is standing at the edge of the water and looking out at the ocean (see the drawing). The height of the person’s eyes above the water is h=1.6 m, and the radius of the earth is R=6.38x10^6 m (use as a precise value). (1) How far is it to the horizon (in meters, ...
January 23, 2011

calculus
Use a graph to estimate the limit: lim θ->0 (sin(5θ)/θ) Note: θ is measured in radians. All angles will be in radians in this class unless otherwise specified.
January 22, 2011

Calculus
A 0.3 ml dose of a drug is injected into a patient steadily for 0.35 seconds. At the end of this time, the quantity, Q, of the drug in the body starts to decay exponentially at a continuous rate of 0.4 percent per second. Using formulas, express Q as a continuous function of ...
January 20, 2011

Calculus
Consider the function f(x) = 5x^3 +5x^2 + 7, and let c be a number in the interval [0.1] . For what values of k is there a c in this interval such that f(c)=k? ______≤k≤______
January 20, 2011

Physics
9.6x10^-19
January 19, 2011

Calculus
According to Car and Driver, an Alfa Romeo going 70 mph requires 177 feet to stop. Assuming that the stopping distance is proportional to the square of the velocity, find the stopping distance required by an Alfa Romeo going at 55 mph and at 115 mph.
January 19, 2011

Math
What is the value of x? A isosceles triangle: bottom - x+3 one side - 2x+5 other side - 3x+2
January 17, 2011

calculus
On the graph of f(x)=6sin(8πx), points P and Q are at consecutive lowest and highest points with P occuring before Q. Find the slope of the line which passes through P and Q.
January 15, 2011

Calculus
In the year 2005, a picture supposedly painted by a famous artist some time after 1815 but before 1865 contains 96.5 percent of its carbon-14 (half-life 5730 years). From this information, could this picture have been painted by this artist? Approximately how old is the ...
January 13, 2011

Calculus
The half-life of radioactive strontium-90 is approximately 31 years. In 1960, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it take until only 11 percent of the ...
January 13, 2011

math
so you will be using the formula y=mx+b to plug the given values into. m=slope which is 8, here b=y-intercept which is 5 so your slope-intercept equation is... y=8x+5
January 13, 2011

Physics
Density of marble is 2.7 x 10^3 kg/m^3... Idk if that helps?
January 4, 2011

Physics
A ball of mass 0.640 kg moving east (+x direction) with a speed of 3.00 m/s collides head-on with a 0.740 kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction of each ball after the collision?
December 19, 2010

Maths
I need help in this subject not to answer a question that I dont even understand.So somebody needs to help me understond this question.Not give me another question to answer.ok.ok
December 18, 2010

math
volume of a triangular prism
December 16, 2010

Chemistry URGENT
If a student starts with 615g of Co(NO3)2 and obtains a 57.3% yield of CoS, what mass of CoS is isolated? Co(NO3)2 + K2S ---> CoS + 2KNO
December 16, 2010

Chemistry
If a student starts with 615g of Co(NO3)2 and obtains a 57.3% yield of CoS, what mass of CoS is isolated? Co(NO3)2 + K2S ---> CoS + 2KNO3
December 16, 2010

geography
Affordable housing and improved transportation allowed people to begin to move away from central cities to the suburbs Think: When did affordable housing and highways come about? The industrial revolution gave rise to urbanization Think: When was the first occurrence of ...
December 15, 2010

Chemistry
I thought it was going to be easier than that.. honestly.. I'm better with math like calculus and formulas.
December 15, 2010

Chemistry
The four quantum numbers for the last electron placed in the orbitals of a certain element are: n=3 l=2 m of l=0 and m of s=-1/2. What is the element?
December 15, 2010

General Chemistry
Well I'm studying for my final and he gave us an answer key and with a spin down it says that the answer is nickel.. SOO I'm trying to make sense of it but I understand what n is what l is but how do you figure out what the elements are from ml? And all of that put ...
December 14, 2010

General Chemistry
The four quantum numbers for the last electron placed in the orbitals of a certain element are: n=3 l=2 m of l=0 and m of s=-1/2. What is the element? I need help with this part of chemistry I have NEVER understood this ever. I know how to do the configurations but not this. I...
December 14, 2010

hum 176
Write a thesis sentence about a movie stating how and why it is more than just a piece of entertainment. The thesis must include why it is a legitimate form of popular culture. Keep in mind factors such as influence and controversy.
December 13, 2010

Physics
The front 1.20 m of a 1550 kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision. (a) If a car traveling 26.0 m/s stops uniformly in 1.20 m, how long does the collision last? cannot_evaluate s (b) What is the magnitude of the ...
December 9, 2010

history
Thank You!
December 9, 2010

history
Why did the Supreme Court rule that segregation was constitutional?
December 9, 2010

Chemistry
a 2.4375 g sample containing a mixture of KClO3 + NaCl is heated and undergoes a mass loss of 0.6191g. What percent of KClO3 is in the mixture?
December 9, 2010

Chemistry
a 2.4375 g sample containing a mixture of KClO3 + NaCl is heated and undergoes a mass loss of 0.6191g. What percent of KClO3 is in the mixture?
December 9, 2010

Chemistry
a 2.4375 g sample containing a mixture of KClO3 + NaCl is heated and undergoes a mass loss of 0.6191g. What percent of KClO3 is in the mixture?
December 9, 2010

Chemistry
a 2.4375 g sample containing a mixture of KClO3 + NaCl is heated and undergoes a mass loss of 0.6191g. What percent of KClO3 is in the mixture?
December 9, 2010

Chemistry
A 2.4375 g sample containing a mixture of KClO3 and NaCl is heated and under goes a mass loss of 0.6191 g. What is the percent of KClO3?
December 9, 2010

Chemistry
I ended up getting 42.718333 not rounded to sig figs but does the excess of hydrochloric acid have anything to do with the answer and what about the STP?
December 8, 2010

Chemistry
If you have Hydrochloric acid, how many grams of aluminum must you use to produce 57.0 L of hydrogen at STP? 2Al(s)+6HCl(aq) --> 3H2(g)+2AlCl3(aq)
December 8, 2010

Chemistry
The specific heat capacity of Lead is 0.127J/degrees C*g. What is the molar heat capacity of Lead? What is the heat capacity of a lead cylinder that has a mass of 235000g?
December 8, 2010

chemistry
specific heat of water there isnt one?
December 8, 2010

chemistry
How much heat energy in KJ is evolved by a reaction in a calorimeter in which the temperature of the calorimeter and water increases from 20.91 degrees C to 26.45 degrees C? The bomb has a heat capacity of 469 J/degrees . The Calorimeter contaains 792 grams of water.
December 8, 2010

Chemistry
Calculate the weight percent of water in NiSO4 6H2O, how to calculate it?
December 8, 2010

alg 2
to find 'x' you add 243 to both sides so: 3x^2=243 divide both sides by 3 3x^2/3 = 243/3 x^2 = 81 then take the square root of both sides so x=9 hope that helps, be sure to plug your numbers back in to check it take 9 and plug it in for x :: 3(9)^2-243 3(81)-243 243-...
December 8, 2010

Chemistry
Calculate the weight percent of water in NiSO4 6H2O, how to calculate it?
December 8, 2010

Chemistry
Calculate the weight percent of water in NiSO4 6H2O, how to calculate it?
December 8, 2010

college Chemistry
B. because it jumps straight from 1s2 to 2p1 it has to go :: 1s2 2s2 then 2p1
December 6, 2010

advice
could you mark each verb used in bold. identify the specific tense used in parentheses. I have seen many examples of different saving plans. I planned on using these strategies in my personal life.
December 5, 2010

physics
but what if it asks how long it will take to fall?
December 4, 2010

physics
OH!! so thats where i went wrong. thanks again! ^w^
December 4, 2010

physics
so its 2*9.81*155?
December 4, 2010

physics
The single cable supporting an unoccupied elevator breaks when the elevator is at rest at the top of a 155 m high building. With what speed does the elevator hit the ground?
December 4, 2010

physics
At the instant a traffic light turns green, a car starts moving with a constant acceleration a of 4.00 m/s2. At the same instant a truck, traveling with a constant speed of 10.09 m/s, overtakes and passes the car. How far beyond the traffic light will the car overtake the truck?
December 4, 2010

physics
thank u so much!! ^w^
December 4, 2010

physics
so how would i go about finding acceleration?
December 4, 2010

physics
The airplane can take off when its airspeed (speed of the air flowing over the wing) is equal to 65 knots. What is the length of runway required for the plane to take off if there is a 21 knots head wind? The runway at the Tallahassee Regional Airport has a length of 8000 ft.
December 4, 2010

Biology
I need help making a concept map. I have to put the following words into one and i dont know where to start. Gene DNA Chromosome Mutations Protiens Central Dogma Signal Transduction Nucleus mRNA tRNA rRNA Ribosomes Autosomes Sex Chromosomes Recessive Translation Transcription ...
December 3, 2010

W.H.Atwell
Does 2Na 2H2O 2NaOH H2 shows that the total mass during a chemical reaction stays the same?
December 1, 2010

12th grade English
ok thank u anyway
November 30, 2010

12th grade English
o an thanks
November 30, 2010

12th grade English
srry its catcher in the rye
November 30, 2010

12th grade English
I need help i have to have a literary term for ch. 1,2,3,5,12,13,14,16,and 26 im having trouble figuring out how to do that so can somone help me please
November 30, 2010

Chemistry
Calculate the percent of carbon, hydrogen, nitrogen, and oxygen in this widely used pesticide, Sevin. The molecular formula is C12 H11 O2 N.
November 23, 2010

Chemistry
Calculate the percent of carbon, hydrogen, nitrogen, and oxygen in this widely used pesticide, Sevin. The molecular formula is C12 H11 O2 N.
November 23, 2010

chemistry
combustion of 0.356g of an unknown metal sample in oxygen gives 0.452g of an oxide in the form of mO2, Identify the unknown metal?
November 23, 2010

Chemistry
A gas has a volume of 4.00 at 0. What final temperature in degrees Celsius is needed to cause the volume of the gas to change to the following, if (number of moles of gas) and are not changed? 290 L
November 23, 2010

chemistry
how do you figure that out?
November 23, 2010

chemistry
What mass of Zn can be dissolved by 558 mL of 3.01M HCl?
November 23, 2010

ela
if you unscramblethe letters SATLEIVER what word do u get and it has to do with thanksgiving
November 22, 2010

algebra
The following problem has a total of six solutions each. (X^2-5x+5)^x^2-9x+2=1. Its extra credit
November 19, 2010

Physics
Find the heat necessary to change 2.5kg of water (ice) at -2 degrees C to steam at 105 degrees C. specific heat ice= 2060 specific heat water= 4180 specific heat steam= 2020 heat of fusion= 3.34X10^5 heat of vaporization= 2.26X10^6
November 18, 2010

Physics
How much heat must be added to 3kg of liquid water at 25 degrees C to change it into steam at 120 degrees C?
November 18, 2010

physics
a banana with a temperature of 17 degrees C (specific heat of banana= 3520j/kgK) and a a mass of 250g is placed in a bowl of milk with a temperature of 8 degrees C and a mass of 350g (specific heat of milk= 4200 J/kgK). no heat is lost to the bowl or the air as the banana and ...
November 18, 2010

Physics
lead melts at 328 degrees C. lead has a heat of fusion of 2.04X10^4 J/kg and a specific heat of 130 J/kgK. how much heat must be removed from 0.50 kg of molten lead (liquid) at 328 degrees C to make it all a solid chunk at 300 degrees C?
November 18, 2010

5th grade science
blank a type of material that tries to prenent the flow of thermal energy.
November 15, 2010

Social Studies
to.................much.....................................for..............................................................brain........................................................................................................AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH...
November 10, 2010

math-- please help
A minor league baseball pitcher is hired for $700 per month plus $100 per game won. Write an equation to express his monthly earnings (e) in terms of games won (x).
November 5, 2010

math --slope and y intercept
A funiture refinishing outlet pays its employlees $40 per day plus $10 per unit refinished. Write an equation to express an employees daily wage(w) in terms of units finished(x)
November 5, 2010

Chemistry
A solution contains an unknown mass of dissolved silver ions. When potassium chloride is added to the solution, a white precipitate forms. The precipitate is filtered and dried and then found to have a mass of 245 mg. What mass of silver was in the original solution? (Assume ...
November 4, 2010

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