Saturday
March 25, 2017

# Posts by Hannah

Total # Posts: 3,323

The space probe Deep Space 1 was launched on October 24, 1998. Its mass was 474 kg. The goal of the mission was to test a new kind of engine called an ion propulsion drive. This engine generates only a weak thrust, but it can do so over long periods of time with the ...
February 10, 2011

A man seeking to set a world record wants to tow a 106000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 77 kg, and the coefficient of static friction between his shoes and the runway is 0.99. What is the greatest...
February 10, 2011

A man seeking to set a world record wants to tow a 106000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 77 kg, and the coefficient of static friction between his shoes and the runway is 0.99. What is the greatest...
February 10, 2011

Algebra
A roadside vegetable stand sells pumpkins for \$5 each and squash for \$3 each. One day they sold six more squash then pumpkins and their sales totaled \$98.00. Write a system of equations to find the number of pumpkins and squash they sold.
February 10, 2011

chem
i need help on this question: Equal masses of gaseous N2 and Ar are placed in separate flasks of equal volume at the same temperature. Tell whether each of the following statements is true or false. a) There are more molecules of N2 are present than atoms of Ar. true or false...
February 10, 2011

World Geography
What are three ways geography influenced Roman History?
February 9, 2011

math
if csc theta= -5/3 and theta has its terminal side in quadrant III, find the exact value of tan 2 theta.
February 8, 2011

English
for "Children of the River" I have to come up with a thesis statement for chapter 1 I don't know what it is.....please help
February 7, 2011

Algebra 1
What property justifies that 3y+9 = 9+3y
February 7, 2011

What is the difference between the actual increase in profit as production increases from 5 to 6 units, and the marginal profit at a production level of 5 units where the profit function is given by p(x)= 3x^2 - 5x + 2 First I plugged 5 into the equation and got 52. Then I ...
February 5, 2011

Find the slope of the graph at y=sqrt 2x^2 +1 at the point (2,3). First I plugged 2 into the equation and got 3. Then the derivative of the equation is 4x and then I multiplied that by 3 and got 12. Is this correct?
February 5, 2011

Math
Find the derivative of f(x)= 2 sqrt x at x=4. i thought that the derivative would be 2 x^1/2 but I guess this is wrong.
February 5, 2011

Math
Calculate the limit limit x->infinity 2x^2 + 100 / x^2 +1 I am not sure how to do this.
February 1, 2011

Math
Find the slope of the curve at y=x^6 at x=-3. I know that to find the slope you do y2 - y1 / x2 - x1 but I do not know what to do here.
January 30, 2011

So if though it says that the rate at which the epidemic is spreading is 110 per day that is not rate of change correct?
January 30, 2011

During the month of February, a flu epidemic hit the University. The number of people sick at time t (measured in days) is given by the function P(t). The rate at which the epidemic is spreading on February 3 is 110 people per day. How is the information best represented ...
January 30, 2011

I had the negative sign there because thatg was one of the answer choices that best fit what I had but there is no negative correct? Its positive?
January 30, 2011

Find the derivative of f(x)=1/3 sqrt x. The 3 is little above the square root. I know that it is -1/3x^-4/3. Can this be written as -1/3x^4/3 ?
January 30, 2011

Another answer choice was y=-2076x + 15,780. Is this correct? If it is I do not understand how they go -2076. Thank you for your help!
January 30, 2011

The value of an automobile was \$15,780 in 1994 and depreciated to \$5400 in 1999. Let y be the value of the automobile in the year x, where x = 0 represents 1994. Write a linear equation in slope-intercept form that models the value y of the automobile, x years after 1994. ...
January 30, 2011

Thank You
January 30, 2011

Find the derivative of f(x)=7x-19 at x=2. I think that the derivative would be 7 and theb times 2 so 14. Is this correct or would it just be 7.
January 30, 2011

chem
I know carbon is tetrahedral but i don't know oxygen
January 29, 2011

chem
I don't get how to the structure and how to find oxygen separetley
January 29, 2011

chem
Determine the electron and molecular geometries of each of the following molecules. For those with more than one central atom, indicate the geometry about each central atom. (Enter your answers in the order given in the skeletal structure from left to right.) CH3OH (skeletal ...
January 29, 2011

Help
Thanks, it didn't look right that's why I reposted
January 27, 2011

Help
I get x=3 can you let me know if I have it right
January 27, 2011

Help
Is there a website that will help me solve this? I can't find anything. I'm coming up with x=1/3 but I feel I'm doing it wrong. Find all real number solutions to (cubed root 3x-8)-1=0 If there is more than one solution, separate them with commas. If there is no ...
January 27, 2011

Math
Is is x=1/3
January 27, 2011

Math
Find all real number solutions to (cubed root 3x-8)-1=0 If there is more than one solution, separate them with commas. If there is no solution, answer as "No solution."
January 27, 2011

Health
thanks, do you have any other suggestions?
January 27, 2011

Health
I need an example of a health fraud item/ product. I need to find one product that has health fraud and that I can write 150 words about. I tried searching on google but cant find anything/ don't know what to search. do you know of any products? thanks
January 27, 2011

History
Describe an advantage of havinf federal judges appointed rather then elected
January 26, 2011

History
Why is it important to learn about the government?
January 26, 2011

History
What problems might arise from making the runner-up in the presidential election the vice president?
January 25, 2011

math
I have no idea... :)
January 24, 2011

chem
thanks:)
January 20, 2011

chem
For each of the following sets of atoms and ions, arrange the members in order of increasing size. Mg2+ F- and Na+
January 20, 2011

algebra
whats the lcd of 8/9x+2/3x=1/9x+45
January 20, 2011

science
can you unscrample this word? its in french. "ratuere"
January 20, 2011

Omg thanks so much!!!
January 19, 2011

I need help with input out put table. The top row is: 1, 4, 3 5 8 9 6 The bot row is: 1, 10,7,13 ? ? ? The question marks are blanks in the table. Hellllllp please
January 19, 2011

Math
I am looking for help integrating using u substitution over the interval of 0 to pi/2 the function cos(2x/3)
January 17, 2011

Math
Solve integration using u substitution of (x+1)sqrt(2-x)dx
January 17, 2011

Math
Solve integration using u substitution of (x+1)sqrt(2-x)dx
January 17, 2011

Physics
d^2=(k*Q1*Q2)/F d^2=(8.99*10^9)(60*10^-6uC)(50*10^-6uC)/175 d^2=0.154 square root of d^2= square root of 0.154 d=0.392m or 3.92cm
January 16, 2011

chem
oh i got it:) thanks:):)
January 13, 2011

chem
i tried [Kr]5s24d8 but it didn't work
January 13, 2011

chem
Use the periodic table to write electron configurations for each of the following elements. (Type your answer using the format [Ar] 4s2 3d10 4p2 for [Ar]4s23d104p2.) 1. Pd thanks
January 13, 2011

chemistry
How many grams of oxygen gas are reacted if 75 g of hydrogen gas is consumed?
January 13, 2011

science
How does a tennis ball change shape when you hit it?
January 10, 2011

Physics
Consider the 676 N weight held by two cables shown below. The left-hand cable had tension 740 N and makes an angle of θ with the wall. The right-hand cable had tension 730 N and makes an angle of θ1 with the ceiling. a) What is the angle θ1 which the righthand ...
January 8, 2011

chem
What is the frequency of radiation whose wavelength is 26.80 Angstrum ? at first i got 1.000e17 and it was wrong. now i only have 1 more try. i tried it again and got 9.993e16 but i don't want to put it in unless its correct. can you guys check my work?
January 8, 2011

Calculus
Find dy/dx, y= -7e^6x+11 + xe^x
December 16, 2010

science
what properties of carbon explain its ability to form many macromolecules?
December 15, 2010

physics
A car moving at 20m/s is sounding its horn as it approaches you. If the actual frequency of the horn is 283 Hz, what frequency will you hear at 25.0 degrees C?
December 15, 2010

Thermochemistry
How many grams of water at 0 degrees C can be frozen into ice at 0 degrees C if 55.0 kJ of heat is removed? delta Hsolid= -6.01 kJ/mol
December 14, 2010

Thermochemistry
3CO(g)+ Fe2O3(s) --> 2Fe(s) + 3CO2(g) + 24.7 kJ. How much heat is released when 56 grams of CO react?
December 14, 2010

Chemistry
The molar heat of solution of NH4NO3 is 25.7 kJ/mol. How much heat (in kJ) would be required to dissolve 20 grams of NH4NO3 in water?
December 14, 2010

Chemistry
How much heat is required to convert 9 grams of water at 100 degrees C into steam at 100 degrees C. Hvap for water = 40.7 kJ/mol
December 14, 2010

Chemistry
Si(s)+ 2Cl2(g) --> SiCl2(g) --> SiCl2(l) + 687 kJ. How much heat is produced when 106 grams of Cl2 react?
December 14, 2010

Chemistry
A student mixes two water solutions with an initial temperature of 25 degrees C to form a final substance with a mass of 65 grams at 30 degrees C. What is the heat change in kJ?
December 14, 2010

Chemistry
How much heat in kJ is required to melt 54 grams of ice at 0 degrees C into water at 0 degrees C if delta Hvap for water = 6.01 kJ/mol?
December 14, 2010

Chemistry
How many calories are required to raise the temperature of 75 grams of water from 20 degrees C to 50 degrees C?
December 14, 2010

ok. so this may be hard to explain and may not be enough info that you understand but ill try. I did a paper and my teacher corrected it and said changes i need to make. here is a clip from the paper of something that she commented on: " Here are some examples. Hard Tack ...
December 13, 2010

english- need a creative title!
thanks for the idea. That would probably work but I don't know if my teacher would understand it because that is not one of the slang words i described in my paper. do you have any other ideas?
December 13, 2010

english- need a creative title!
For my english class i had to right a paper on civil war slang and how this topic releated to the book The Red Badge of Courage. I finished my paper but have no idea of a creative title. Im not good at thinking up good titles :/ have any ideas?
December 13, 2010

Algebra
why is any real number a solution for the equation 8y - 30 = 4(2y - 7.5)
December 12, 2010

chem
i don't think 34 is correct because that is way more than 10% of my first answer of 5.7
December 11, 2010

chem
Some sulfuric acid is spilled on a lab bench. It can be neutralized by sprinkling sodium bicarbonate on it and then mopping up the resultant solution. The sodium bicarbonate reacts with sulfuric acid as follows. 2 NaHCO3(s) + H2SO4(aq) --> Na2SO4(aq) + 2 H2O(l) + 2 CO2(g) ...
December 11, 2010

Math
A population is 200 in the year 1825, 252 in 1850, and 318 in 1875. What is the p(t) equation? I see that the population increases 26% over each 25-year period but I can't figure out the equation.
December 9, 2010

Math
Dina earned 1/4 for baby sitting and 1/2 for washing the dishes. How much money did she NOT earn from \$25.00?
December 9, 2010

Geometry
sam..? im assuming just like the others we cannot see your documents so we don't know what the picture looks like. sorry
December 9, 2010

chem
thanks for the help: can you help me with another one? Some sulfuric acid is spilled on a lab bench. It can be neutralized by sprinkling sodium bicarbonate on it and then mopping up the resultant solution. The sodium bicarbonate reacts with sulfuric acid as follows. 2 NaHCO3(s...
December 9, 2010

chem
thanks so its 5.21 L h2?
December 9, 2010

chem
2Al(s) + 2NaOH(aq) + 2H2O(l) 2NaAlO2(aq) + 3H2(g) (unbalanced) sorry i forgot. it was unbalanced but then i balance it
December 9, 2010

chem
Calculate the number of liters of hydrogen, measured at STP, that can be produced from the reaction of 0.155 mol of aluminum according to the following unbalanced chemical reaction equation. i got .193 L of H2 but it was wrong. i only have one submition left!
December 9, 2010

December 9, 2010

chem- plz check my work
2. Given the following equation, C2H5OH(l) + 3 O2(g)---> 2 CO2(g) + 3 H2O(l) How many liter of CO2 are expected in the combustion of 12.0 grams of ethanol? My work: 12.0g C2H5OH X 1 mol C2H5OH/46.08g C2H5OH X 2 mol CO2/1 molC2H5OH X 22.4L CO2/1 mol CO2 = 11.7 L CO2 all i ...
December 8, 2010

chemisty
when looking at a chemical equation what are the evidences that a chemical reaction has occured. Or what is the evidence that it has not occured thanks:):) <3
December 8, 2010

Physics
What is the volume of 3.25 moles of a gas at a temperature of 115 K and a pressure of 275 kPa?
December 8, 2010

Physics
A pendulum is constructed of a 6.7 gram mass suspended on a 55cm thread. The mass is displaced vertically 55 cm to a point exactly horizontal from the top of the thread and released. The mass swings down and is cut directly above the mass when the mass is 120 cm above the ...
December 7, 2010

CHOIR
can you find the music online? Why not just ask her for another copy when you get to school tomorrow and tell her what happened
December 7, 2010

english
I need two examples where in the book Huckleberry finn. Huck doesn't believe in himself or he is having self doubt. does anyone know an example or two where this happens in the book? thanks
December 7, 2010

chem
how would you find the answer? A carbon nucleus has six protons and six neutrons. How many electrons would it take to equal the mass of a carbon nucleus?
December 6, 2010

chem
can you explain? For each of the reactions shown, calculate how many grams of the product form when 16.8 g of the reactant in bold completely reacts. Assume that there is more than enough of the other reactant. 4 Cr(s) + 3 O2(g) 2 Cr2O3(s) thanks
December 6, 2010

huckleberry finn
in the book huckleberry finn manys words are used that mean something like "to beat someone" for example to lick. i need to find 8 more of words that are used to mean "to beat" if you know any and the page number/chapter it is used in the book that would be...
December 5, 2010

Chemistry
because you take the ratio and just use them as subscripts for its corresponding element. So if carbon came out to 2 and hydrogen came out to 6, then it would simply be C2H6.
December 4, 2010

Chemistry
It would be C2H6
December 4, 2010

Calculus
Find the unique solution to the differential equation y"?1y'?6y=?24(t^2)+10t+41 satisfying the initial conditions y(0)=?6 and y'(0)=?26
December 3, 2010

Calculus
(1 pt) Find the unique solution to the differential equation y"?5y'+6y=?312sin(2t) satisfying the initial conditions y(0)=?31 and y'(0)=?18
December 3, 2010

Geometry
You do 1/2 base times height, so 1/2(14cm)(18cm)=126cm. Dont forget units! Your welcome:)
December 1, 2010

Math fractions
You must make the denominators the same by multiplying the numerator and the denominator of 1/2 by four to get 4/8. Your welcome:)
December 1, 2010

huckleberry finn
also the word valley on page 174( at least in my book) its in the context that reads "the king said the cubby would do for his valley- meaning me"
December 1, 2010

huckleberry finn
what is the definition of dauphin this huckleberry finn? I searched on the internet but there were so many i didn't know which one was used in the book
December 1, 2010

math
Use a table of values to graph the equation. solve for y x= -1,0,1 y= y=2/3x+6
November 30, 2010

chem
I got it:) it was just not a precipitate:) Thankyou sooooo much:)
November 30, 2010

chem
could it also be an acid-base?
November 30, 2010

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