Questions Asked on
November 8, 2008

physics conservation of momentum
A 0.5 kg ball is thrown horizontally towards a wall with a speed of 10 m/s. The initial velocity is chosen to be the positive xdirection for this question. The ball horizontally rebounds back from the wall with a speed of 10 m/s in the negative
asked by rachel 
college chemistrythermochemistry
A 1.50g sample of NH4NO3(s) is added to 35.0g of water in a foam cup and stirred intil it dissolves. The temperature of the solution drops from 22.7 to 19.4 degrees celcius. What is the heat of dissolution of NH4NO3, expressed in kJ/mol NH4NO3?
asked by maryanne 
organic chemistry
Determine the percent composition of your unknown mixture. My data for refractive indexes for acetone is 1.365 and water is 1.330. This is what my unknown mixture was composed of. How do I use this info to find percent composition of each compound?
asked by Jenn 
japanese :)
anyone really good at Japanese writing and stuff? :D because i could use some help with some of my exam preparation and sentence structures and stuff :) ( i will add your email address if that's okay) domo arigatou ^^"
asked by remi 
chemistry
Calculate the heat of formation of SiO4(s), given that the heats of formation of SiO2(s), 910.90 KJ/mol; H2O(l), 285.8 KJ/mol; HF (g), 271.1 KJ/mol. I know the heat of formation is products minus reactants but how do i do this when no reaction is given
asked by matt 
science...help
name the covalent compounds SCI6 CS2
asked by Anonymous 
math
a rectangular box with a volume of 60 ft^3 fas a square base. Find a funtion that models its surface area S in terms of the length x of one side of its base
asked by lauren 
chemistry
what is the best combination for preparing CH3CH2CH2CH2OCH3 is CH3CH2CH2CH2OH+NaOCH3 CH3CH2CH2CH2ONa+NaOCH3 CH3CH2CH2CH2Br+NaOCH3 CH3CH2CH2CH2Br+CH3Br
asked by Jake 
chemistry
The reaction of secbutylmagnesium bromide with formaldehyde followed by hydrolysis yields? 2,2dimethyl1pentanol 2butanol 2methyl1butanol 2pentanol 2,2dimethyl1propanol
asked by Jake 
math/physics
a ball with mass 0.15 kg is thrown upward with initial velocity 20 m/sec from the roof of a building 30 m high. there is a force due to air resistance of v/30, where velocity v is measured in m/sec. a. find the maximum height above the ground the ball
asked by cyrus 
chemistry
what is the best synthesis of 2methyl2pentene (CH3)2C=CHCH2CH3? 1.(CH3)2CHCH2CH2CH3+F2,heat 2. KOC(CH3)2 1.(CH3)2CHCH2CH2CH3+Cl2,heat2.NaOCH2CH3 1.(CH3)2CHCH2CH2CH3+Br2,heat2.NaOCH3 1.(CH3)2CHCh2CH2CH3+I2,heat2.NaOCH2CH3
asked by Jake 
chemistry
Write balanced halfcell reactions and equations for the following: Mo24O37(s) + MnO4(aq) makes MoO3(s) + Mn+2(aq) (BASIC)
asked by kate 
chemistry
Calculate the number of grams of reactant left over when 28.35 grams of silver reacts with 50.0 liters of air at STP which is 20.9476 % oxygen by volume. The density of air at STP is 1.292 g/L. attemtp at solution volume of oxygen= .209476*50L=10.5L How do
asked by jason 
chemistry
C6H5NO2+? = C6H5N2Cl
asked by Jake 
physics check my answers)
An ice skater of mass 50kg moving at 10 m/s coasts to a halt in 100 m on a smooth ice surface a. calculater acceleration of the skater (.5 m/s) b. what is the force of friction between the ice and the skates? (25 N) c. calculate the coefficient of friction
asked by lauren 
11th gradeMath!
an air traffic controller spots two planes at the same altitude flying towards one another. their flight paths form a right angle at point p. One plane is 150 miles from point p and is moving 450mph. the other plane is moving at 450mph but is 200 miles
asked by Amy 
maths please check my answer
paul orders a pizza. chef carl randomly chooses two different toppings to put on the pizza from the following:~ pepperoni, onion, sausage, mushrooms and anchovies. if paul does not eat pizza with mushrooms, determine the probablity that paul will not eat
asked by Anonymous 
physics
A 20 kg sled rests on a horizontal surface. if it takes 75 N to start the sled in motion and 60 N to keep it moving at a constant speed, what are the coefficients of static and kinetic friction respectively? explain please
asked by kim 
science
the result of all 3 physicl tests shown are most useful for determining the 1.. rate of weathering of the minerals 2.. identity of the minrels 3.. envoronment for the minerals formed 4.. geologic period when the minerals formed
asked by Anonymous 
SAT Essay
Is compromise always the best way to resolve a conflict? Plan and write an essay in which you develop your point of view on this issue. Support your position with reasoning and examples taken from your reading, studies, experience, or observations.
asked by Sahil 
social studies
hi can someone help me with these two questions 1. The bank of the US a. refuesed to engage in corruption b. fostered "wildcat" Western banks c. was partly foreign owend d. issued unsound currency I think the answer is B 2. Federal internal improvements in
asked by bill 
college chemistrythermochemistry
i have one more question: I know this one has to do with hess's law but i'm not sure of how to get the enthalpy of vaporization from this? Clculate the enthalpy of vaporization of solid potassium bromide to a gas of ions, the process
asked by maryanne 
Math and Society
You can afford monthly payments of $1200. If current mortgage rates are 7.5% for a 30year fixed rate loan, what loan principal can you afford? If you are required to make a 20% down payment and you have cash on hand to do it, what price home can you
asked by Michele 
11th gradeCalculas
An animal will defend the region around its home by attacking intruders that come in to the region. According to the statistical studies reported in J.M. Emlen's Ecology: An Evolutionary Approach, the defended region's area varies directly with the 1.31
asked by Amy 
social studies
Hi can someone help me please with this question 1. The mormons achieved success in Utah primarily because of a. economic individualism and free enterprise b. rejection of foreign immigrants c. economic cooperation and collectivism d. cooperation with the
asked by bill 
maths
john has a total of 9 stamps, which consists of 25cent and 2cent stamps. his stamps have a value of $1.10. how many of each stamp does john have?
asked by jess 
torque problem!
A spring (k =819N/m) is hanging from the ceiling of an elevator, and a 5.1kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length) when the elevator is accelerating upward at a = 0.46m/s^2?
asked by Cecilia 
3rd grade music
Song, "America" by Neil Diamond. In stanza 7, "Got a dream they've come to share" what does this line mean and what do the people have in common.Use examples from song to support answer.
asked by elaine 
HR but about Special Education Teachers
Answer the following questions about a new employee training program for the position you selected for your final project: (final project Special Ed Teacher) 1. Needs assessment: What types of issues might indicate a need for training? From what sources
asked by Christi 
11th grade
A uniform plank of length 6.0 m and weight 231 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the drawing). To what distance x can a person who weighs 451 N walk on the overhanging part of the plank before
asked by Cindy 
Science/English
Here is my Science presentation, I'm having trouble with the last two sentences. What would you put as the last two sentences? Computer Technology My presentation is about how computers have changed from the past to the present. Then what I think is going
asked by Sammi 
English game
Find a Person Who Game (1) Directions : Hello, class. Today we are going to play the Find a Person Who Game. I have prepared a sheet of paper for you each. Write the numbers 1 through 16 in the squares above. You can put them in any order you would like.
asked by John 
English/Grammar
I have a comma question! When using the phrase "as well as" do i put the comma before, after, or before AND after the phrase. An example sentince is: At the store i bought milk as well as bread.
asked by Abby 
geometry
please help find answer. very urgent. triangle PQR is a 306090 triangle with right angle Q and segment PQ as the longest. Find the possible coordinates of R if (2,6) and Q (2,6). please help
asked by chippy 
intergrated science
can u unsramble this word for me please the assatiepr
asked by jade 
Differential Calculus
use the rule that says limit of (e^h  1)/h = 1 as h approaches 0 to show that the limit of [ln(x+h) lnx]/h as h approaches 0 = 1/x, where x>0
asked by Kristen 
Chemistry
I need help with getting started: 1.The crystal structure of an ionic compound consists of alternating cations and anions lying next to each other in three dimensions. If the cation radius is 55.1% of the anion radius and the distance between the cation
asked by Cathy 
science
in the year 1971. astronaut alan shepard hit a golf ball whila on the surfase of the moon. it became the longest golf shot in history alan shepard was able to hit his recod golf shot because A.the moon dods not have any gravity B.THE GRAVITY OF THE MOON IS
asked by steven 
accounting
Calculate margin, net income, and ROE For the year ended December 31,2009, Ebanks, Inc. earned an ROI of 12%. Sales for the year were $96 million, and average asset turnover was 2.4 Average owners equity was $32 million. Calculate Ebanks, Inc.’s margin
asked by MURIEL 
Chemistry
I need help with getting started: 1.The crystal structure of an ionic compound consists of alternating cations and anions lying next to each other in three dimensions. If the cation radius is 55.1% of the anion radius and the distance between the cation
asked by Kate 
environmental studies
What landfill and waste characteristics would be best suited to a bioreactor process?
asked by Thano 
History
How many years has it been since the first century to today?
asked by Sammi 
global ...help
the ancient athenians are credited with 1inventing and using the wheel 2 eliminating sanvery 3 inventing the printing press 4 esablishing governments that had democratic elements.
asked by Anonymous 
chem
a compound containing only boron, nitrogen and hydrogen was found to be 40.3% B, 52.2%N, and 7.5% H by mass. If 3.301g of this compound is dissolved in 50.00g of benzene, the solution produced freezes at 1.30 degrees celsius. If Kf(freezing point
asked by tomi 
biology
Why do bamboos have leaves that encircle the stem? (Is it for some kind of structure support?) Also, why are there leaves at the top of the plant on lateral branches? There is graffiti at the base of some of the bamboo shoots. Why doesn't the graffiti grow
asked by Anonymous 
health care
If the health care organization is going to use advertising; should there be any restrictions on what the ad may contain?
asked by april 
french
comment diton "donuts"? so "do you like donuts?" would be "tu aimes ....?" merci
asked by amanda 
Environmental Studies
How does landfill gas move in the environment?
asked by Thano 
Environmental Studies
When does methane production occur in a landfill and when is it profitable?
asked by Thano 
Maths
two algebra questions which i need for Tuesday. 1. when h is 105 what is n in the following formula: n(n+1)  2 2. the same as question one but this time h is 5050
asked by Rebecca 
Law
The Canadian Charter of Rights & Freedoms is a bill of rights. How to I do explain what a 'bill of rights' is to someone about 5 years of age?
asked by Lena 
eth 125
hat are some way Japanese Americans have maintained levels of economic success since WW II
asked by Anonymous 
Math
It is kind of logic question that deals with math. A Contractor needs 54 square feet of bricks to construct a rectangular walkway. What does that mean? Please explain very clearly.
asked by R 
calculus
use the rule that says limit of (e^h  1)/h = 1 as h approaches 0 to show that the limit of [ln(x+h) lnx]/h as h approaches 0 = 1/x, where x>0
asked by Anonymous 
physics
A soild wheel initially rotating at 50.0 rad/s comes to a uniform stop after 8.00 rotations. Calculate the tangential accleration at the rim. Given that the angular acceleration is 24.9 rad/s^2. I know its aT = r alpha but how do I get the radius?
asked by Rod 
English
There are four types/purposes of Communication 1. Exposistion 2. Narration 3. Description 4. Argumentation can someone give me a definition and an example of Exposistion? thanks. :)
asked by Akitsuke 
Math check
Solve: 3x^211=0 Is the answer" + sqrt 11/3?
asked by Shawn 
Writing
i have to do a research paper for journalism class. It has to be something that has to do with washington, d.c. but the topic cant be too generalo. it has to be something specific that i will be able to write 1,500 to 3,00 words. Also, the topic has to
asked by ELLEN 
physics again (check answers please)
What net force increases a velocity of a car from 20 m/s to 35 m/s in 8.0 s if the mass of the car is 1600 kg? (3000 N). What force would cause the car to stop? (3000N) What coefficient of friction is needed to supply the force of friction? (.0191) are
asked by lauren 
biology
You are conducting an experiment to determine whether lichen populations are affected by local airborne pollutants. Which of the following observations would best support your hypothesis that high levels of pollutants in rainwater cause a reduction in
asked by Anonymous 
Calc
cylindrical can is to be made from a rectangular piece of aluminum that is 25 inches long and 10inches high by rolling the metal horizontally. Determine the circumference of the cylinder, the radius of the cylinder, the height of the cylinder, and the
asked by Kelley 
11th GradeCalc
cylindrical can is to be made from a rectangular piece of aluminum that is 25 inches long and 10inches high by rolling the metal horizontally. Determine the circumference of the cylinder, the radius of the cylinder, the height of the cylinder, and the
asked by Kelley 
biology
Why do bamboos have leaves that encircle the stem? (Is it for some kind of structure support?) Also, why are there leaves at the top of the plant on lateral branches? There is graffiti at the base of some of the bamboo shoots. Why doesn't the graffiti grow
asked by Anonymous 
chemistry
i need help with a balanced equation for the displacement of aluminum in the soil and H+ ions from acid rain? (for leaching) thanks :)
asked by remi 
chemistry
The average speed of a hydrogen molecule at 20*C is 1930m/s. What is the wavelength of the H2 molecule at this temperature?
asked by joe 
Law
What's the criteria for being a Canadian citizen? And if you are born in Canada are you automatically a Canadian citizen? Like suppose you can on vacation to Canada from some foreign country and you gave birth to your kid here, would your kid be a Canadian
asked by Lena 
DDP...help
if the accepteable range is between .745 in and .755 in, what percentage of your sample blocks would be considered unaccesptable?
asked by Anonymous 
Math
I am having a hard time with these problems and could you show me how to work them so next time i will know how. find the first and third quartiles of Q and Q of the set of numbers 11,12,16,14,14,14,8,12,10,18 find any outliers ( if any) in the set of
asked by Gertrude Sanders 
physics
A block slides down a 10 angled incline at a constant speed. what is the coefficient of sliding friction between the blocks surface and the incline?
asked by kim 
french
Q'estce que veut dire "n'estce pas"?
asked by amanda 
social studies
in harcourt bracesocial studies ancient civilizations is it true or false that steling was not a very serious crime & why
asked by maria valecia 
Math
If a famlies total living expenses are 63,000 a year. After the death of the insured, the total family income would be 55,000. How much life insurance is required to cover the dependents icome shortfall, if prevailing interest rate 4%. I am not sure that
asked by Debbie 
Algebra
Solve: 5x(x5)2x(x+4)=90 Is the answer 5,6 ?
asked by Shawn 
Chemistry
what is the big idea of energy
asked by Chinchilla 
sciencce
a block slides down an angle 10 incline at a constant speed. what is the coefficient of sliding friction between the block's surface and the incline?
asked by kim 
math
what is the standard deviation of the numbers {78, 79, 81, 82, 85}. And can you tell me how i am supposed to find the standard deviation
asked by chase 
Calculus
Find the limit of (10^x  5^x)/x as x approaches 0 without using l'Hospital's rule
asked by Anonymous 
Medical transcription
Can you please tell me if the following transcription for a Pathology report makes sense, and if it is correct? The glands'slides closed together, but afebrile's stroma separates them. Copora amylase is present within numerous glands. Papillary epithelia
asked by Ruth 
intermediate algebra
Write the equation of the line containing (3,4) and perpendicular to y = 2/3x + 2. Write your answer in slopeintercept form. Not sure how to do this one. m = 3/2 y = mx + b y  4 = 3/2 (x4) am i on the right track? would I add 4 to the y side to make
asked by jennifer 
math help me/....
how do we solve this??? 2(3x5)+12=0 and this?? 4/11 = x+6/ 2x
asked by Anonymous 
math
solve by the substitution method 3x + 6y = 27 2x + y = 12 what is the solution of the system..(type an ordered pair, or N if there is no solution) has to be like (3,5)please help me
asked by mikey123 
Math Algebra check
Solve: 3x^211=0 Is the answer" + sqrt11/3?
asked by Shawn 
Organic
Are any of the following a tertiary amine 2methyl2butanamine NMethyl1butanamine NMethyl2butanamine
asked by Jake 
organic
Explain why glucose undergoes mutarotation
asked by Jake 
speeches
Im doing my speech on guiness world records, but i don't know how to start it. Can u help me think of something?
asked by chantelle 
Math
in 15 and 16, suppose f(x)=x. Find a equation for the image of f under the transformation. 15. S(x,y)=(x/4,5y) 16. T(x,y)=(x+1,y)
asked by Trisha 
SOSE
in a dictatorship who has no say in anything? and how are they excluded?? THANX!!
asked by SAMMI^^^ 
6th grade English
Why is diversity healthy within a culture?
asked by Emma Leigh 
AED
i still need help comparing these 2: comparing and contrasting approaches for teaching English language arts in a constructivist classroom and in a traditional classroom
asked by troyer0269 
science
What does ti mean to depress the scapula? Does that mean to shrug shoulders?
asked by Lauren 
social studies
what are pennsylvania 5 natural regions?
asked by joseph 
maths helpppppp!!!!!!!!!!!!!!!!!!!!!!!!!!
is this correct??? 2+(5) 25 7 7. and how do we do this??? 3+10
asked by Anonymous 
math
2 times the cube root of radical 3. plus the cube root of radical 4.
asked by amanda 
organic
which phenol is the most acidic? phenol 2methyl6nitrophenol 3methyl5nitrophenol 2,6dimethyl3nitrophenol 2,4,6trimethylphenol
asked by Jake 
science
whish of the following plantstraits not inherited gras turns darker when sprinkled whid nitrgen B.arosebush has thorns C.maple tree leaves die in the fall D.a cactus stores water
asked by steven 
math
help with ratios pleeeeeeeeeeeease or i get an f
asked by diana 
Physics
a car accs from 10 m/s to 50m/s in 8 seconds, what is the acceleration?
asked by Tommy 
Calculus
what is the limit of x/(ln x) as x approaches 0?
asked by Jane 
DDP
what phase(s) of a design process might sttistics be most applicable?
asked by Anonymous 
global....help
which ancient civilization established the basis of western democrocy?
asked by Anonymous