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November 21, 2014

Posts by katie


Total # Posts: 1,689

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

science
How do you calculate the atomic mass of magnesium? 79% magnesium-24, 10% magnesium-25, 11% magnesium-26
March 14, 2011

algebra
Tammy bought 16 cookies for a party. She had 6 cookies decorated at an extra cost of 25 cents each. If the total cost of the cookies was $9.50, how much did each plain cookie cost?
March 13, 2011

Science
What is the initial temperature? If it is just for phase change then the formula is Q = m L Q = 0.063 x 32.3
March 12, 2011

Science
Calculate the amount of heat required to completely sublime 63.0 g of solid dry ice CO2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 C.
March 12, 2011

Science
Calculate the amount of heat required to completely sublime 63.0 g of solid dry ice CO2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 C.
March 12, 2011

Chemistry
What is the change in internal energy of a system that releases 1275 J of heat to the surroundings and is compressed so that 235 J of work are done on the system?
March 11, 2011

english
thankyou so much that is so helpful
March 7, 2011

english
Im not sure on how to do my introduction on an essay for a school magazine giving your views on how people treat animals? can someone please help me thanks alot
March 7, 2011

Geography/History
sorry i was saying katilin
March 7, 2011

ENG
Choose the correct verb: Some people (know, Knows) more about their favorite TV characters than they do about the members of their own family. A) knows B) know
March 6, 2011

chemistry
A 6.0 L flask contains a mixture of methane, argon and helium at 45 degrees C and 1.75 am. If the mole fractions of helium and argon are 0.25 and 0.35, respectively, how many molecules of methane are present?
March 1, 2011

Math
The number of calls received by a car towing service averages 14.4 per day (per 24 hour period). After finding the mean number of calls per hour, find the probability that in a randomly selected hour the number of calls is 0
February 27, 2011

calculus
let f(x)=sqrt x+4. Calculate the difference quotient f(5+h)-f(5)/h for h=.1 h=.01 h=-.01 h=-.1
February 24, 2011

PRE-ALGEBRA
2V/5+V/4
February 22, 2011

Calculus
A retangular poster is to be made out of cardboard. The margins on the top and the bottom will be 2 inches. The margins on the sides will be 1 inch. The area of the poster devoted to the printed material must be 300 square inches. (a) to the nearest .001 inches, find the ...
February 17, 2011

algebra1
how do you slove x+3y=-30 9x-12y=3 with substitution and elimation
February 16, 2011

5th grade math
How many possible combinations for an 8-digit binary number are there? How did you get this an answer?
February 15, 2011

Chemistry
A square of aluminum foil measuring 3.20 inches on each side weighs 275 mg. The density of aluminum is 2.70 g/cm3. Find the thickness (in micrometers) of the foil.
February 11, 2011

algebra 2
find the average rate of change for the function f(x)=60x-3x^2 between x=6 and x=19
February 9, 2011

science 4th grade
Science fair projets with fish
February 8, 2011

english
where did the jim crow laws take place? and why?
February 7, 2011

Calculus
The shape is a cone. The radius is 6 cm and the height is 9 cm
February 6, 2011

Calculus
If water is poured into a cup at a rate of 1 cubic centimeter per second, how fast is the dept of the water increasing when the water is 4 cm deep? r = 6 cm h = 9 cm V = 1/3(pie) r^2 x h V = (pie)r'h + 1/3 (pie)r^2 h' 6 / 9 = r / h 6h = 9r r = 3 / 4.5 h V = 1/3(pie) (3...
February 6, 2011

Calculus
Okay, I see what I did wrong. I did dy/dt = 6 instead of dy/dt = .5. Thanks a lot
February 6, 2011

Calculus
A street light is hung 18 ft. above street level. A 6-foot tall man standing directly under the light walks away at a rate of 3 ft/sec. How fast is the tip of the man's shadow moving? I know I would've to set up a proportion. 18 / 6 = x + y / y x = distance of man from...
February 6, 2011

Calculus
Two trucks start from the same point. One truck travels due east at a rate of 50 mph and the other trucks travels due north at a rate of 60 mph. At what rate is the distance between the two vehicles increasing 1 1/2 hours later? I think the answer is 55 mph because I added 60...
February 6, 2011

Calculus
The slope is actually -5. And forget I think i understand this now.
February 6, 2011

Calculus
In the diagram below, the y-coordinate of point P is increasing at a rate of 4 units per minute while point Q remains in its fixed position. Find the rate of change of angle, in radians per minute, when y = 20. y ^ | P (0, y) | | | | |---| |___|________ Q (4, 0) Then, P (0 , ...
February 6, 2011

calculus
Your welcome. Don't worry you'll do good in your studies, keep it up
February 6, 2011

calculus
For example, √x is the same as x^1/2, the derivative of √x is 1/2^ -1/2 equals to 1 / 2√x sqrt(3x) = sqrt(3)sqrt(x) and the derivative of this is sqrt(3)*derivative(sqrt(x)) = sqrt(3)/2sqrt(x), as d/dx (sqrt(x)) = 1/2sqrt(x). now, multiply the top and bottom ...
February 6, 2011

Managerial Accounting
A food division reported cost of sales-food of $198,680. Employees' meals cost $1,225, complimentary meals $142 and transfers in were received from teh bar operaton with a cost of &82. Determine the net cost of sales.
February 6, 2011

alg and trig
6x^3-5x^2+15x+5 / 2x^2-x+3
February 2, 2011

science
how do u learn the skeleton bones in one night
January 31, 2011

NOUNS, PRONOUNS, AND ADJECTIVES
is a noun to go with it
January 29, 2011

Chemistry
Calcium carbonate reacts with phosphoric acid to produce calcium phosphate, carbon dioxide, and water. 3 CaCO3(s) + 2 H3PO4(aq) Ca3(PO4)2(aq) + 3 CO2(g) + 3 H2O(l) How many grams of phosphoric acid react with excess calcium carbonate to produce 3.47 g Ca3(PO4)2?
January 27, 2011

Chemistry
I did follow those steps and they didn't work for the first problem.
January 27, 2011

Math
i don't know what you mean by infinity?? thanks for the other help (:
January 25, 2011

Math
btw, i dont know if i should switch the sign (greater than or less than) or if it should be negative! thank you
January 25, 2011

Math
i have no idea!!!!!
January 25, 2011

Math
-1/4k is greater than 18
January 25, 2011

math in topics
Wait time for a counselor is 60 minutes. There are five counselors and each counselor see a student for an average of 30 minutes per day. How many new counselors are needed to shorten the wait time to 15 minutes? Each counselor see 5 students per day totaling 25 students
January 25, 2011

math in topics
Wait time for a counselor is 60 minutes. There are five counselors and each counselor see a student for an average of 30 minutes per day. How many new counselors are needed to shorten the wait time to 15 minutes?
January 25, 2011

alg2
Solve: 3x − 7 (sqrt x) + 2 = 0
January 20, 2011

alg 2
simplify (x^3/4)^3
January 20, 2011

Social Studies
for class, my teacher is making us do a booklet of key terms that we need to know. We have to draw pictures for each key term. I need some ideas on what to draw for Articles of Confederation and Land Ordinance of 1785. please help!
January 19, 2011

Physics
a) 4% b) 0.4% c) 0.07%
January 17, 2011

HISTORY
(This homework question was removed due to a copyright claim submitted by K12 Inc.) You do NOT have to write me my paragraph, but what I would like is for you to answer each question next to a bullet-point so I can write my paragraph. For example, answer each of these ...
January 15, 2011

math
2x-3y=12 x=4y+1 substitution, elemenation
January 13, 2011

8th grade Math
I need help finding heighth of a pyramid.
January 13, 2011

MT
Identify 2-3 business issues and provide an explanation of why technology cannot be used to aid or solve them.
January 12, 2011

algebra
thank you.
January 11, 2011

algebra
if a student has an average of 8 after 20 tests and then gets a 0 on his 21st test, what would his new average be?
January 11, 2011

Chemistry
If you start with ten grams of lithium hydroxide, how many grams of lithium bromide will be produced? Round to the nearest tenth. Don't forget the units.
January 9, 2011

social studies
This helped me a lot thank you so much!
January 6, 2011

Math
What is the units you measure for area please help fast
January 5, 2011

English
It's Relative Pronoun. David I is wrong because Demonstrative Pronouns are this, these, that and those.
January 4, 2011

physics
nina has a mass of 40 kg and bruno has a mass of 100 kg. they stand on a slippery surface and push off eachother. bruno has an acceleration of 1.0 m/s squared. what is nina's acceleration?
December 22, 2010

PHYSICS
santa drops a package from his sleigh while traveling at constant velocity. if there is no air resistance, with the package hit the ground in front of the sleigh, behind the sleigh, or directly below it? explain reasoning.
December 22, 2010

PHYSICS
does the sun exert a gravitational force on the earth? if so, why doesn't the earth fall into the sun?
December 22, 2010

PHYSICS
assume you have a mass of 100 kg on earth. on the moon, where the gravitation of the moon is 1/6 gravitation of the earth, what is your mass on the moon and what is your weight on the moon
December 22, 2010

PHYSICS
what are the components of a vector that has a magnitude of 1.5 m at the angle of 35 degrees with respect to the positive x axis
December 22, 2010

PHYSICS
Alex is doing tight circles with his car in an empty parking lot, all the while holding his speedometer reading to a steady 20 mph. Is Alex traveling at a constant velocity? Why or why not?
December 22, 2010

11th grade
A reflecting telescope contains a mirror shaped like a paraboloid of revolution. If the mirror is 4 inches across at its opening and is 3 inches deep, where will the collected light be concentrated?
December 16, 2010

physics
as an object is dropped from a high cliff, which of the following statistics can be made in regard to the objects potential energy?
December 16, 2010

physics
A ship approaches saturn at 10.4km/s and saturns speed is 9.6km/s (relative to the sun). Take the interaction as elastic collision. Saturns mass is greater than the space ship. Find the speed of the ship after it goes around Saturn.
December 8, 2010

physics
ladder of mass m and length l leans against a frictionless wall at an angle of 60 degrees. The coefficient of static friction between the ladder and ground is 0.45. A man whose mass is 4 times the ladder climbs up. How far up the ladder can he go before he slips?
December 8, 2010

economics
what is the history on credit cards?
December 7, 2010

algebra 2
A flagpole at a right angle to the horizontal is located on a slope that makes an angle of 12 degrees with the horizontal. The pole's shadow is 16 meters long and points directly up to the slope. The angle of elevation of the sun is 20 degrees. Draw the triangle. Write an ...
December 7, 2010

Advanced Physics
If wind blows at a speed of 30 m/s over the roof of your house, what is the pressure diference on your roof between the air inside and the air outside? What net force does this produce on a roof having an area of 175 m^2? 1.3 kg/m^3 is the density of air.
December 5, 2010

Geometry
Point H is the midpoint I'd line segment GJ Line segment GH is 7x-5 HJ is 4x+1 what is the value of X?
December 5, 2010

Physics
For part c, you use the help Ewater+Eiron=the answer from part a. So this would be the set up: (4186*5*delta T)+(448*1.2*delta T)=0.7 20930delta T + 537.6delta T = 0.7 21467.6delta T = 0.7 delta T= 3.26E-5
December 3, 2010

organic chemistry
How would i construct a graph of refractive index versus percent 1-bromooctane for KI and KCl reactions
December 2, 2010

trig
Find the sign of the expression if the terminal point determined by t is in the given quadrant. cos t X sec t in any given quadrant
December 1, 2010

Math
How to solve the simultaneous equations 3x + y = 17 and y = x + 1 ?
December 1, 2010

College Algebra
ln 2+6 ln x+4 ln (x^2=8) How would I rewrite the expression? I'm struggling in Math.
November 30, 2010

physics
Suppose you roll a bowling ball at 2.5 m/s across the roof of a flat building. It leaves the edge and strikes the ground 2.0 s later. How high is the roof? How far from the edge of the roof does the ball hit the ground?
November 28, 2010

physics
Two spheres A and B, where A has twice the mas of B, are projected at the same horizontal velocity off the edge of two different height shelves. Sphere A leaves from a height of 2.0 m. Sphere B leaves a shelf 1.0 m off the floor. If both spheres leave the edge if the table at ...
November 28, 2010

psychology
Surveys suggest that up to 4% of the U.S. population suffers from generalized anxiety disorder. How are anxiety disorders viewed by various psychological perspectives such as psychodynamic, biological, cognitive, and humanistic? With which perspective do you most agree? With ...
November 23, 2010

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