Friday
August 22, 2014

Posts by katie


Total # Posts: 1,666

Chemistry 101 college
you have 10 mL of a 1.0 M Ba(OH)2 solution and add it to 2.5 L of water. What is the concentration of hydroxide ionsin the diluted Ba(OH)2 solution?
July 19, 2011

Calc 3
intersect x^2+y^2=36-8x^2-8y^2
July 13, 2011

physics
Number of beats heard per second = 15/5 = 3 beats/sec. We know number of beats heard per second = difference in frequency of the two sound waves. So 3 = 440 - fp, where fp is the frequency of the piano key which is slightly lower than 440 Hz. Solving for fp, we get fp = 337 Hz.
July 9, 2011

math
what is the arithmetic average of the following numbers: 16, 35, 42, 57, and 60?
July 5, 2011

geometry
In rectangle ABCD, if the coordinates of A are (0, 0) and the coordinates of C are (r, s), what are the coordinates of B.
July 5, 2011

Chemistry
PLease help how many grams of potassium chlorate decomposes to potassium chloride and 638 mL of O2 at 128°C and 752 torr? the formula given: 2KClO3(s) 2KCl(s) + 3O2(g)
July 5, 2011

chem
how many grams of potassium chlorate decomposes to potassium chloride and 638 mL pf o2 at 128°C and 752 torr? 2KClO3(s) 2KCl(s) + 3O2(g)
July 5, 2011

geometry
In parallelogram ABCD, A (0,0),B(a,b)and D(c,0)are three of it's vertices, what are the coordinates of C in terms of a,b,c
July 4, 2011

geometry
In parallelogram ABCD, A (0,0),B(a,b)and D(c,0)are three of it's vertices, what are the coordinates of C in terms of a,b,c
July 4, 2011

geometry
In parallelogram ABCD, A (0,0),B(a,b)and D(c,0)are three of it's vertices, what are the coordinates of C in terms of a,b,c
July 3, 2011

geometry
in an equilateral triangle RST, R has coordinates (0.0)and T has coordinate of (2a,0).Find the coordinates of S in terms of a.
July 3, 2011

Algebra 2
In(e^16x)=8 Solve for x.
June 29, 2011

algebra
The number of computers sold by BCC depends on the dollar amound,x, that they spend on advertising. How much must they spend to sell 200 computers? Round to the nearest dollar and do not include units in your answer. N(x)=100+20 * In(0.25x)
June 29, 2011

Physics
The gauge pressure at the bottom of a vertical tube (open to the atmosphere) filled with mecury is 100kPa. How high is the column of mecury in the tube? I used the formula pressure=density * gravity * height which i reaaranged to find h= 100000Pa/(13570kg/m3*9.8)=0.75m but ...
June 15, 2011

chemistry
-7.81 × 103 kJ/mol
June 14, 2011

maths
simply fully sp to the power 4 divide by 10p to the power 3
June 5, 2011

maths
it just says work out the nth term for the those numbers
June 5, 2011

maths
what is the answer
June 5, 2011

maths
dont understand
June 5, 2011

Math Probability
3) For years, ocean going ships have been using colored flags for signaling. By changing the order of the colored flags, the ships can send out different signals. If most ships carry six flags (each of different colors) how many different signals are possible if... a) all six ...
June 5, 2011

busness math
A is better
June 3, 2011

civics
Cabinet members are nominated by the President and confirmed by Secretary of State House of Reps Senate Supreme Court is it Supreme Court?
May 26, 2011

civics
what was the major difference between Greek and Roman democracy? A The Romans elected people to run their govt B The Greeks had everyone who was eligible participate in govt decisions C Roman democracy included everyone while Greek democracy included only free, white men D ...
May 26, 2011

Physics
A runner travels 100 m in 10.9 s. Assume that it takes him 1.35 s to reach his top speed, which is then maintained for the rest of the race. Find the following values: a) acceleration during the first 1.35 s b) maximum speed
May 26, 2011

english
For Grapes of Wrath and the American Dream, how did the setting affect the characters vision of the dream? Is it sort of brutal because there was starvation, poverty, and death?
May 25, 2011

english
How does the valley of ashes give a vision of the American Dream? Is it like that it showed prosperity?
May 25, 2011

english
How did the settings of The Great Gastby and Grapes of Wrath affect the characters' version of the American Dream?
May 24, 2011

Chemistry (Electrons in Atoms)
are the units for energy J*s
May 23, 2011

Chemistry (Electrons in Atoms)
The wavelength of visible light varies from 0.40 μm to 0.70 μm as the color of the light changes from violet to red. Calculate the energy of a photon whose wavelength is 0.67 μm HINT: From the wavelength and the speed of light, we can get the frequency. Then the...
May 23, 2011

Chemistry (Electrons in Atoms)
is the answer 780373.3333
May 23, 2011

Chemistry (Electrons in Atoms)
What is the wavelength of the emitted photon, when the electron in the hydrogen atom makes a transition from the ni = 5 state to the nf = 3 state?
May 23, 2011

Civics (The American President Movie)
In the movie the American Dream President Andrew Shepard (Michael Douglas) shows the roles of the President. What are examples of him being 1. Chief of State 2. Chief Executive 3. Chief Adminstrator 4. Chief Diplomat 5. Commander in Chief 6. Chief Legislator 7. Chief of Party ...
May 23, 2011

Physics
i mean 80 microfarads
May 22, 2011

Physics
How long will it take a charged 80-ìF capacitor to lose 20 percent of its initial energy when it is allowed to discharge through a 45 ohm resistor?
May 22, 2011

physics
Resistance in a Series Circuit lab: Determine the coded value of your resistors. (I found 270 ohms, 560 ohms and 750 ohms) ***Enter the toleranace value as indicated by the color of the fourth band. (all were gold) How do I find TOLERANCE VALUE of the gold band??? Thank you.
May 19, 2011

physics
three resistors of 10, 15, and 20 ohms are connected in parallel to a source of current. In which resistor is the current greatest How do I set this up?
May 18, 2011

exp in math
I see where I made a mistake thanks!
May 15, 2011

exp in math
convert 110010 to base 10 2 I'm not sure about this one is it 60 or 62 I did all the steps, but it seems like I'm still missing something
May 15, 2011

exp in math
convert 1100 two to base 10 I came up with 1100 2 = 12 is this correct?
May 15, 2011

explorations in math
the question reads covert the numeral to a numeral in base 10 2068 12
May 15, 2011

explorations in math
covert 2068 twelve to base 10
May 15, 2011

explorations in math
4.5 + 1.1 20 + 1 21
May 15, 2011

explorations in math
convert the numeral to a numeral in base 10 14 5
May 15, 2011

Math
1) use the M method to solve the following linear programming problem: Minimize C+ -5x+10x+15x Subject to 2x+3x+x <(or equal to) 24 x-2x-2x >(or equal to) 1 x,,x,x>(and equal to) 0
May 14, 2011

Chemistry
A solution contains an unknown amount of dissolved calcium . Addition of 0.112 mole of K3PO4 causes complete precipitation of all the calcium. How many moles of calcium were dissolved in the solution?
May 14, 2011

Chemistry
A solution contains 0.133 g of dissolved Lead. How many moles of soduim chloride must be added to the solution to completly precipitate all of the disolved lead? What mass of sodium chloride must be added?
May 14, 2011

Calculus
Give the domain of each of the functions listed below : a) f(x)= ln (tanh^-1 (x)) b) g(x) = cos ^-1 (e^x) I just don't know how to set them up to solve for x ...I'm doing a Calc course online on my own, and would really appreciate the help :) Thanks
May 13, 2011

Math
The nominal rate of interest is 8% and the rate of inflation is 5%. A single deposit is invested for 10 years. Let: A= value of the investment at the end of 10 years measured in "constant dollars," i.e. in dollars valued at time 0. B= value of the investment at the ...
May 11, 2011

Chemistry
1% glucose = hemolysis 2% NaCl = crenation 5% NaCl = crenation .1% NaCl = hemolysis
May 9, 2011

Physics
A 180 kg object is taken to a height of 350 km above the Earth's surface. The object's mass of height is 180 kg. What is the object's weight at this height?
May 8, 2011

Art Appreciated
Discuss how the Late Gothic sense can be seen as an evident in Berlinghieri's St. Francis Altarpiece.
May 5, 2011

geometry
how do I find the measurement of the hypotenuse side of a triangle when the other side measurements are 5 and 12
May 1, 2011

physics
Electrons flow from a ___ potential to a ___ potential.
May 1, 2011

physics
Find the cross-sectional area of copper wire that is 55.4 m long and has a resistance of 0.943 ohms. The resistivity of copper is 1.79 x 10^-8 ohms m.
April 28, 2011

Chemistry
You have a reaction using the following criteria: 1.3456 g of barium chloride solution (0.786M) is mixed with 1.20089 g of sodium sulfate solution (1.3M). The ambient pressure is 754.564 mmHg and the temperature is 56.889 degrees celsius. Determine the volume of the gas produced.
April 26, 2011

Statistics
TRUE OR FALSE: For a set of data with mean 6 and variance 16, approximately 68% of the values will fall between -2 to 14.
April 25, 2011

English
I need help analyzing this poem please Seasonal Anxiety Spring never felt like a beginning— Something, perhaps, to do with school And all the school-year's slow unspinning From wound-up time as from a spool Aimed at Summer's golden rule. Beginnings are for autumn ...
April 24, 2011

PHYSICS
Sally Sue, an enthusiastic physics student enjoyed the opportunity to collect data from standing waves in a spring. She and her partner help the ends of their spring 4.00 meters apart. There are 5 nodes in the standing wave produced. Sally moved her hand from the rest position...
April 19, 2011

Math 9
2 extension ladders are leaning at the same angle against a vertical wall. The 3 meter ladder reaches 2.4 meters up the wall. How much farther up the wall does the 8 meter ladder reach?
April 19, 2011

Prime Minister
nuclear power generation is like the plants in Japan that are causing so much trouble. If it was me, i would suggest to keep the exisiting plants we have now, and upgrade their saftey levels and back up power sources. And, in the future, if we as a country, build more, they ...
April 19, 2011

science
This disease starts in infancy and usually results in death by the age of 4 years.
April 19, 2011

Biology
Try this link and see if it helps you any. the human genome project in google.
April 19, 2011

statistics
Let x be a continuous random variable that is normally distributed with a mean of 24 and a standard deviation of 7. Find the probability that x assumes a value between 27.5 and 59.0. Use Table IV in Appendix C to compute the probabilities. Round your answer to four decimal ...
April 18, 2011

statistics
Let x be a continuous random variable that is normally distributed with a mean of 65 and a standard deviation of 15. Find the probability that x assumes a value less than 45.
April 18, 2011

statistics
Find the area between x = 9.5 and x = 23 under a normal distribution curve with μ = 20 and σ = 4 .
April 18, 2011

statistics
Let x be a continuous random variable that is normally distributed with a mean of 65 and a standard deviation of 15. Find the probability that x assumes a value less than 44.
April 18, 2011

6th grade math
Find the sum of the angle in each regular polygon. (Pentagon)
April 18, 2011

physics
Using fn = (nv)/(2L) and plugging in values as fn = f6 = 557.14 = (6v)/(2*0.7) and solving for v, we get v = 130 m/s.
April 17, 2011

physics
Using fn = (nv)/(2L) and plugging in values as fn = f6 = 557.14 = (6v)/(2*0.7) and solving for v, we get v = 130 m/s.
April 17, 2011

physics
Prolonged exposure to sounds of intensities lower than the threshold of pain can also damage the ear. This is more dangerous since there is no pain to warn the victims about the ear damage and they can end up damaging their ears unknowingly through prolonged exposure to such ...
April 17, 2011

physics
(A) When only one end is open, it is a 'closed' pipe and so we use Where fn = frequency of nth harmonic (Hz) n = harmonic number v = speed of sound inside the pipe (m/s) L = length of pipe closed at one end (m) Plugging in the values and solving, we get f1 = 428.75 Hz ...
April 17, 2011

Spanish-7th please check
Did I answer these correctly? ¿Qué necesitas para jugar al tenis? Necesito una raqueta y una pelota de tenis para jugar al tenis. ¿Cuándo juegas el ajedrez? Yo juego el ajedrez por la noche.
April 13, 2011

physics help
I need help confirming my answers: 1) The work done on an electric charge equals a) IR b)q/t c)Vq d) It I think it's C.(Vq) 2) The direction of an electric field is the direction that a ___ test charge will move when placed in the field. a)negative b) positive c) neutral I...
April 10, 2011

biomechanics
If a soccor ball with a mass of 0.43 kg is kicked while it is in the air, with a force of 15 N oriented 32 degrees above the horizontal, what is the resultant acceleration?
April 8, 2011

physics
I need help confirming my answers: 1) The work done on an electric charge equals a) IR b)q/t c)Vq d) It I think it's C.(Vq) 2) The direction of an electric field is the direction that a ___ test charge will move when placed in the field. a)negative b) positive c) neutral I...
April 7, 2011

Chemistry
All of those are separate reactions that are being reacted with 50 mL of 1.50 M NH3.
April 5, 2011

Chemistry
How do you calculate the volumes of the acid solutions (1.50M HCl, 1.50M HNO3, and 1.50 M H2SO4?
April 5, 2011

Math
A circular garden has an area of 25π m2 If the . radius is increased by two meters, and fencing is sold only in one meter sections, how much fencing is needed to keep out the rabbits
April 4, 2011

Chemistry
Sorry my computer accidentally resent it!
April 3, 2011

Chemistry
Is a calibrated thermometer more precise than one that has not been calibrated? What implications does this have for measuring temperature changes as contrasted with measuring individual temperatures?
April 3, 2011

Chemistry
Is a calibrated thermometer more precise than one that has not been calibrated? What implications does this have for measuring temperature changes as contrasted with measuring individual temperatures?
April 3, 2011

MATH
Method 1 Simply list the multiples of each number (multiply by 2, 3, 4, etc.) then look for the smallest number that appears in each list. Example: Find the least common multiple for 5, 6, and 15. First we list the multiples of each number. Multiples of 5 are 10, 15, 20, 25, ...
March 31, 2011

chemistry
A scientist wants to make a solution of tribasic sodium phosphate, \rm Na_3PO_4, for a laboratory experiment. How many grams of \rm Na_3PO_4 will be needed to produce 250 mL of a solution that has a concentration of \rm Na^+ ions of 0.600 \it M?
March 30, 2011

Chemistry
Would you use q/mass*change in T= c so 1930J/(500g*10degC)=.386J/degC?
March 29, 2011

Chemistry
An unknown material absorbs 1,930 J of heat when it changes from 25 °C to 35°C. The sample weighs 500g. What is the specific heat of this material?
March 29, 2011

Math
After the first 41 games of the baseball season, the Red Sox have a winning percentage of 0.585 and the Yankees have 0.512. How many games behind the Red Sox are the Yankees?
March 29, 2011

math
so there be 25 green, 15 blue, 10 red???
March 29, 2011

math
TODAY
March 26, 2011

chemistry
write an equilibrium constant expression for the reaction of acetylene gas with hydrogen gas to produce methane gas.
March 24, 2011

algebra
A set of 2 similar triangles was drawn in a design. One of the triangles was ½ of the other. If the measures of the smaller triangle were 5, 7, and 12 cm, the measures of the larger triangle = 10,14 and 20 cm. true or false
March 24, 2011

Geometry quick i have test tomorrow
what is the length of any diagonal of a regular pentagon with a side of 20mm
March 23, 2011

geometry
what is the length of any diagonal of a regular pentagon with a side of 20mm ?
March 23, 2011

Chemistry
How do i determine the exact molarity of .2 M of HCL? The molarity of NaOH Used was .2010M used in the titration. And the volume used 10.33 mL used to reach equivalence point. What would be the Molarity of HCL?
March 22, 2011

math
if less then a half of a garden is planted with corn is it a reasonable to estimate that 2-3rds of the garden is planted with corn?
March 21, 2011

chemistry
If 74.5 grams of a hot metal was added to 56.4 grams of water and the temperature of the water rose from 20.4 to 33.4 degrees, how many KJ of energy was lost by the hot metal? i need helping setting up where the numbers go. I'm lost
March 20, 2011

chemistry
i need help setting this problem up. i don't understand which numbers go where
March 19, 2011

chemistry
If 74.5 grams of a hot metal was added to 56.4 grams of water and the temperature of the water rose from 20.4 to 33.4 degrees, how many KJ of energy was lost by the hot metal?
March 19, 2011

Differential equation- Math
Find the general solution of the following system of equation? Please help, i don't know what to do... dx/dt = 3x +2y +2z dy/dt = -5x - 4y - 2z dz/dt = 5x + 5y +3z.
March 17, 2011

amet
substituting t=12s gives a = 2(12) - 10 = 14m/s-2 Using the formula d = Vit +1/2 at^2 d = 15(12) + 0.5 (14)12^2 d = 180 + 1008 d = 1188 meters (distance traveled) add the initial position d = 1188 + 1.8 = 1189.8 (Position of particle) I hope this is correct... :(
March 17, 2011

social studies
it say to briefly describe the events that followed the Confederate defeat at Gettysburg. (civil war). first is followed meaning before or after. and what does it mean by describe the events?
March 16, 2011

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