Saturday
February 13, 2016

# Posts by jake

Total # Posts: 2,050

Physics
A 66.0 kg diver is on a diving board, which is 1.10 m above the water. He falls at a speed of 9.10 m/s. Calculate his kinetic energy as he hits the water. I know KE is 1/2mv^2, but how can I find KE when height is involved?
March 4, 2008

social studies
why did the great wall lose its importance after Wu Di's reign
March 4, 2008

science
what can you use to decide whether liquids tested are polar or nonpolar?
March 3, 2008

science
what basis can you use to decide whether liquids tested are polar or nonpolar?
March 3, 2008

science
A substance in a solid at room temperature. It is unable to conduct electricity as a solid but can conduct electricity as a liquid. This compound melts at 755 degrees celsius. Would you expect this compound to have ionic bonds, metallic bonds, or covalent bonds? A) metallic ...
February 28, 2008

science
below are about 21 questions from my final study guide. I was given a 563 question study guide for my final and obviously I did not understand every question. So basically I did not understand 4% of the questions which is pretty good. Just any help with the questions below ...
February 28, 2008

science
This is a science question so be prepared. lol How many orbitals does hydrogen (H) have? 1 or 2 or 3 How many orbitals does oxygen (O) have? 1 or 2 or 3
February 25, 2008

science
I need some help with my science homework. Well it is not really my homework it is my study guide but the actual test is the same as the study guide almost. They just switch around the words and stuff around to mess with your mind. These were just the only 7 problems I need ...
February 25, 2008

science
I need some help with my science homework. Well it is not really my homework it is my study guide but the actual test is the same as the study guide almost. They just switch around the words and stuff around to mess with your mind. These were just the only 7 problems I need ...
February 25, 2008

long physics E&M
i have the same problem.
February 19, 2008

Maps
I need to find a map where I can highlight countries on it. It has to have Switzerland, Europe, and The United States included on it.
February 12, 2008

physcial science
a 50 kg crate is lifted to a height of 10 meters. a. how much potential energy does the crate have after being lifted? b. if it took 5 seconds to lift the crate, using a machine what was the power rating of the machine?
February 11, 2008

physical science
a car of mass 900 kg move at 10 m/s. What is the braking force required to stop the car in a time of 5 seconds?
February 11, 2008

physical science
this is the question in the book, i dont understand either
February 11, 2008

physical science
find the net force produced by a 40 Newton force and a 50 Newton force in each of the following cases: Both forces act in the same direction both forces act in opposite directions.
February 11, 2008

physical science
Thats all the information i have
February 11, 2008

Psychology
When was the California Psychological Inventory created?
February 8, 2008

Psychology
Where was the Rorschach ink blot test created? I know it was created by a Swiss psychologist Hermann Rorschach but where?
February 8, 2008

Math
To gather enough nectar to make 1 pound of honey, a bee must visit 2 million flowers. How many flowers must a bee visit to make 64 ounces of honey?
February 7, 2008

AP Chemistry
Could you please review my work and see what i'm doing incorrectly? Thank you Given this information: CxHyOz (s) + O2 (g) ----> CO2 + H20 given: 2.165 g of the unknown hydrocarbon v = 1.868 L P = 130.2 kPa T = 65.0 degrees C g of H2O = 1.818 a)find g H in hydrocarbon 1....
February 5, 2008

Chemistry
this helped so much! thank you, i understand now.
February 4, 2008

Chemistry
Sorry I have one other question that i'm unsure about. for the solution process of A (s)----> A (aq) the teacher demonstrates upon mixing A in H2O that the temp falls from 22 to 5 degrees C. The soluability of this solid is known to be 28g/100g H2O at 30 degrees C. If ...
February 4, 2008

Chemistry
thank you
February 4, 2008

Chemistry
If the partial pressure of CO2 is 2.87 atm the soluability in H2O is known to be 4.68 M. What would be the soluability of CO2 in H2O if the partial pressure is increased to 7.60 atm? Assume the temp is held constant. would it work to set up a proportion for this question? if ...
February 4, 2008

Chemistry
The vapor pressure of water above a sugar water solution at 25.0 degrees C is 21.4 mmHg. What is the mole fraction of sugar in the solution? (assume sugar is a non-electrolyte, non-volatile solute and the vp of pure water at 25 degrees C is 23.8 mmHg) help, how do i solve this...
February 4, 2008

Literature
In Lord Of The Flies, Jack leaves part of what they kill for the beast. What does this remind you of, in general?
February 1, 2008

CHEMISTRY
that couldn't be right though because i only started out with .953 g and conservation of mass applies
January 30, 2008

CHEMISTRY
so the second equation would be: 0.635X + 0.526(0.953-X)=0.944 ????? 0.635X + 0.5013-.526X=0.944 0.109X/.109=0.4427/.109 x=4.061???? to three sig figs=4.06 is that the grams of BaCrO4???
January 30, 2008

CHEMISTRY
Yes, I didn't want to use a second variable because my teacher wants us to use different approaches. i checked the molar mass of AgNo3 and it is 169.87, so thank you. I didn't notice that. the new factor would be: 107.87/169.87 = .635 i'm not quite sure how to ...
January 30, 2008

CHEMISTRY
sorry, it would probably hep you to know that the objective is to calculate the percentage of silver and barium in the nitrate salt mixture. i know how to find the percentage once i get the grams, but i have no idea how to get the grams from this point. thanks :]
January 30, 2008

CHEMISTRY
I'm in the same class as Catie, and we're working on the same lab; however, i chose a different approach. here's what i have below, your help is much appreciated. so i have X= g AgNO3 0.953-x = Ba(NO3)2 therefore .953-X-NO3=? so far I caluclated the % of Ag and Ba ...
January 30, 2008

English
What are some images Robert Browning is trying to make us see in "A Woman's Lat Word" and "Rabbi Ben Ezra"? Is there a site where I can read an analysis of these two poems?
January 30, 2008

AP CHEMISTRY
The unit cells for most alkali metal halides are face-entered for both the cations and anions. In the case of NaCl the sodium ion is just a little too large for the chloride ions to touch each other along the face diagonal. The unit cell edge length is 564.0 pm. The sodium ion...
January 24, 2008

science
for what?
January 16, 2008

Biology
thanks
January 12, 2008

Biology
I know that the phosphate [cells] and sodium barcarbonate [blood plasma] buffer systems are two examples of biological buffers; however, i am writing an essay for bio and i need a third example. does anyone know of a third biological buffer system?
January 12, 2008

Science
Why is is it important to place your arm in a horizontal position rather than letting it hang down at your side when you take your blood pressure? Does everyone's heart create the same pressure? Why or why not?
January 12, 2008

Science
A fish is homozygous dominant for bug eyes and his mate is heterozygous. show the possible offspring. i have BB BB Bb and Bb for the possible offspring, but how do I express this phenotypic ratio? would 4:0 correct?
January 9, 2008

Chemistry
If I have to make a solution with sodium bicarbonate (baking soda) how do i find the molarity and how do i correctly make the solution??? i.e. how do i prepare a solution of sodium bicarbonate with a molarity of 0.01?
January 8, 2008

math
Damon I really dont understand please one hint.mt mom does not understand either
January 7, 2008

math
One number in each group does not fit 66,90,32,45,300 Pattern? 99,981,459,89,729 Pattern? 128,244,556,788,762 Pattern
January 7, 2008

math
12,18,15,21,18,24,21,27,24,30,27,34 13,26,18,36,23,36,28,41,33,46,38,51 44,54,47,57,50,60,63,73,66,76,69,79,72, 15,14,15,24,25,34,35,44,45,54,55
January 7, 2008

math
complete the pattern 12,18,15,21,18,?,?,?,?,?,?, 13,26,18,36,23,?,?,?,?,?,?,?, 44,54,47,57,50,?,?,?,?,?,?,?, 5,14,15,24,25,?,?,?,?,?,?,?,?
January 7, 2008

Math
How do i find the equation of a parabola in the form ax^2+bx+c?
January 7, 2008

AP CHEM
An ice cube tray contains enough water at 22.0 C to make 18 ice cubes that each have a mass of 30.0g. The tray is placed in a freezer that uses CF2CL2 as a refridgerant. The heat of vap of CF2CL2 is 158 J/g. What mass of CF@CL2 must be vaporized in the refridgeration cycle to ...
January 2, 2008

AP Chemistry
Thank you!
January 2, 2008

AP Chemistry
I was wondering if anyone could possible help me with this homework question? The normal boiling point for acetone is 56.5 degrees C. At an elevation of 5300 ft the atmospheric pressure is 630. torr. What would be the boiling point of acetone (deltahvap = 32.0 kJ/mol) at this ...
January 2, 2008

What is discrete math? And is it relatively easy?
I ask because my TA recommended taking it next semester along with calc 3. My major is electrical engineering, and I might throw actuarial science into the mix too. So yeah, lots of math.
December 18, 2007

French
thats right
December 10, 2007

Math
why does the president put vegtables in his blender?
December 9, 2007

physics
i dont get it
December 4, 2007

How do you use the substitution method in math?
Example: 2y + x = 3 (1) 4y – 3x = 1 (2) Equation 1 looks like it would be easy to solve for x, so we take it and isolate x: 2y + x = 3 x = 3 – 2y (3) Now we can use this result and substitute 3 - 2y in for x in equation 2: Now that we have y, we still need to ...
November 28, 2007

Biology
they have exoskeletons?
November 27, 2007

English (Classical Myths)
I have a myth project assigned. I got lucky (or so I thought) and had the myth of Polyphemus. Wikipedia has it if anyone doesnt know it. There are three things that I need for my project: 1) The moral of the story. 2) How the story explains natural phenomenon. 3) How the myth ...
November 27, 2007

biology - requirements of diffusion?
Im pretty sure its D because I think both A and C are needed and B sounds logical.
November 27, 2007

Math
oh lol, first I looked at this question and I was like wow, this is impossible to do because I thought you were asking for the COMMON factor for all of those... in the case of factors of each individual #... it should take you less than 5 minutes to do them... so you have ...
November 20, 2007

math
please help! find 3 consective numbers with a sum of 12. find three consective numbers with a sum of 45
November 20, 2007

Anything related to projectile is related to quadratic. Examples can range from shooting a bullet like the example above to a simple action such as throwing a baseball upward. You can use quadratic to figure out what is the maximum height your ball will goes up to, what's ...
November 20, 2007

biology
umm... aren't they both contain DNA and DNA is made out of nitrogenous base and phosphate backbone? So I would say nitrogen and phosphorous.
November 19, 2007

Algebra/Trigonometry
huh? what is this? lol... 1/y-1/y = 0... then -3 = -3 duh?
November 18, 2007

Chemistry
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
November 18, 2007

Chemistry
Not 100% sure, but I say it's D. I think there are only 4 orbitals: s(2), p(6), d(10), f(18).
November 18, 2007

Biology
In glycolysis, Acetyl-CoA is recycled so it can be used again for another cycle or elsewhere for biosynthesis.
November 18, 2007

science
Efficiency can never reach 100% because there's always loss of energy during the process of carrying out work. One example is energy loss because they're converted into heat while operating.
November 16, 2007

math
Okay, this one you really really should plot out the coordinates. It will give you an approximate orientation of the line. If plotted it out and realized that ST is a diagonal segment with a POSITIVE slope (meaning it goes up from left to right, that let you know that the y ...
November 13, 2007

math
No, I didn't say D is (3,-1). The question asks you for 3 points on the segment CD that will divide that segment to 4 pieces equally. I'm just saying that the CLOSEST point to CD is (3,-1) just to correct what drwls said. The 3 points on the segment CD are (3,-1), (3,2...
November 13, 2007

math
Just plot out the two points and connect them and count the number of squares on your graphing papers to find the length. You should have 12 squares total in length if you drew in correctly because (8+|-4|) =12. Now you need to divide that into 4 equal parts so do 12/4 = 3 ...
November 13, 2007

math
3^2 is where I get the +9 from... the -6x is from (-3x)+(-3x). Solution = (-2,-1),(8,-1).
November 13, 2007

math
13^2 mean "13 square" or "13 x 13" or "13 raise to the power of 2". You have to square both sides of the equation to cancel off the "square root" on the right side of the equation so you can figure out "x", not "square ...
November 13, 2007

math
All right... so you have two points (x,-1) and (3,11) this is correlating to (x1,y1) and (x2,y2)in the distance formula. d = sqroot [(x2-x1)^2 + (y2-y1)^2] Plug in the numbers and you'll have: 13 = sqroot [(3-x)^2 + (11-(-1))^2] 13^2 = x^2-6x+9 + 12^2 169 = x^2-6x+153 0 = ...
November 13, 2007

math
I replied you, but I can't see it down here. Click on your first post of your question to view it.
November 13, 2007

math
Okay, to do all these problems relating to point coordinates. The first thing you do is to plot those points on the graph so you can have a clear picture of what it looks like. That's just a hint although you might be able to do this without plotting it, but it will be ...
November 13, 2007

math
Maybe re-wording this question will help you out. Find the distance between two points: a)(-4,3) and (5,-4) b)(-3,-2) and (3,5) I'm sure your teacher gave you this formula: d = sqroot [(x2 - x1)^2 + (y2 - y1)^2] where x and y are defined as (x,y) in the coordinate. x2 just...
November 13, 2007

Chemistry - Kinetics
a) Yes, you can probably tell because the activation energy gets lower and thus allow the reaction to speed up way faster than without a catalyst... it's kind of dumb to ask if in catalyst is involved in a CATALYZED reaction... b) No, the catalyst will get recycled at the ...
November 13, 2007

Genetic
I need to write a proposal of the possible traits we can actually measure in lab. What are some quantatitive traits of woodlice/isopod beside measuring their maximum speed.
November 13, 2007

math
What do you mean by "how would be the answer"? The answer to this problem is 1.
November 7, 2007

math
At 4:00 Joe's thermoter read 30C. He put it in the freezer and read it every 5 minutes. At 4:05pm, the temperature was 23C. At4:10pm the temperature was 16C.The pattern continues, when will the temperature be below 0C?
November 5, 2007

science-physics
November 5, 2007

Evolution
In an experiment using quantitative genetic approaches to investigate the evolution of butterfly eye-spots as a model system for understanding development. There are 3 groups of butterfly populations: small (mean diameter = 2.6 mm), intermediate (3.4 mm), and large eyespots (3...
November 5, 2007

Algebra 2
The way I think of "range" is the possible values of the y-axis on your graph. The easiest way to see this is to actually enter the function into your graphing calculator and graph it out. In your example, you have a straight line with a slope of -1/3, so basically ...
November 5, 2007

math
how many possible 3 digit numbers are there that have a middle zero? how many possible 4 digit numbers are there that have two middle zeros? Explain your answears
November 4, 2007

CHEMISTRY
I don't even understand how this question works. How do I solve it? A microwave oven heats by radiating food with microwave radiation, which is absorbed by the food and converted to heat. suppose an oven's microwave is 13.7 cm. a container w/ 175 mL of water was placed...
October 31, 2007

IB Math Studies
Would it be appropriate to use a chi-square test for analysis of statistics in the following topics? •Number of Surgical Fatalities vs. U.S. State •Number of professional men’s soccer injuries vs. country of their team
October 28, 2007

AP US History
compare the rebellion of the american revolution to the rebellion of the civil war
October 28, 2007

CHEM-HELP!!!!
help? how do i calculate the heat of formation of a solid? i only know how to find the heat of formation of a liquid. here's what i have so far. delta t= 16.8 degrees c mass= 33.136 g cp = 4.184 j/g degrees c m cp delta t = -2329J (process is exothermic) what do i do now?
October 24, 2007

English
Does anyone recall the mythical beasts that were described on the map in Ondaatje's Running in The Family, the chapter entitled Tabula Asiae? I left my book in my locker ;/
October 24, 2007

Chemistry
Zinc is often used to calibrate calorimeters because it undergoes a very sharp phase transition from the solid to the liquid at 419.5°C. Calculate the enthalpy change when 5 g of zinc metal is heated from 100°C to the point where the entire sample is melted. (The heat ...
October 23, 2007

Math
If you say "10 less than y". Does it mean 10-y or y-10. Which is correct and why?
October 17, 2007

CHEMISTRY
If 142.38 g of l water at 21.7 degrees C is placed into a syrofoam cup with 174.36 g of ice at -27.5 degrees C what would be the final temperature of the entire contents at equilibrium? If it is partially frozen, how many g of the ice has melted? given values cp water = 4.184 ...
October 14, 2007

use google book search to find the first line of page 3 in the book 'curious george goes to a chocolate factory' [sorry to make you do this hw but my internet is not fast enought to load this page] thx ^^!
October 2, 2007

Chemistry
2 HCl (aq) + Ba (OH2) (aq) ----> BaCl2 + 2 H20 (l) deltaH = -118 kJ Calculate the heat when 100.0 mL of 0.500 M HCl is mixed with 300.0 mL of 0.100 M Ba(Oh2). Assuming that the temp. of both solutions was initially 25.0 degrees C and that the final mixture has a mass of 400...
October 1, 2007

CHEMISTRY
A 2.75 g sample of the hydrocarbon acetone, CH3COCH3, is burned in a bomb calorimeter with 975 mL of water, initially at 23.50 degrees celsius. The bomb is constructed of 285.0 g of nickel metal having a specific heat capacity of Cp = 0.826 J/ g degrees C. The final ...
September 30, 2007

Ap Chemistry
Posted by Jake on Sunday, September 23, 2007 at 1:08pm. My objective is to find the molar volume of a gas. Is this the correct balanced equation for magnesium ribbon reacting with hydrochloric acid to form hydrogen gas? 2Mg (s) + 2HCL (l) ----> H2 (g) + 2MgCl (aq) Also, I&#...
September 25, 2007

AP Chemistry
Thanks, sir. This is what I did, could you tell me if its correct? given value 1.072 g/meter 1.072 g/m X .02 m [the magnesium ribbon was 2.0 cm] = 0.02144 gMg Then to find the moles of H2: 0.02144 g mg ( 1 mol Mg/24.31 g Mg) (2 mol H2/1 mol Mg) = 1.76 X 10^ -3
September 23, 2007

AP Chemistry
My objective is to find the molar mass of a gas. Is this the correct balanced equation for magnesium ribbon reacting with hydrochloric acid to form hydrogen gas? 2Mg (s) + 2HCL (l) ----> H2 (g) + 2MgCl (aq) Also, I'm required to find the mass of the magnesium ribbon in ...
September 23, 2007

Economics
economics
September 22, 2007

pigskin geography
i dentifly the panhandle state the the seattle seahaw will fly over going to their game
September 19, 2007

american history
What were republicans plans to do about Roosevelt not following through with things he said he would do? like not using the bullypullpit and stuff. PLEASE HELP!
September 15, 2007

science
how do u convert tons into kilograms?
September 13, 2007

Chemistry
Carminic acid,a naturally occuring red pigment extracted from the cochineal insect, contains only C,H,and O. It was commonly used as a dye in the first half of the nineteenth century. It is 53.66% C and 4.09% H by mass. A titration of the 0.3602 g sample pf the carminic acid ...
August 27, 2007