Questions Asked on
June 12, 2012

chemistry
A 375 g sample of well water is found to contain 17.0 mg of lead. How much lead (in parts per million) is in the well water? Round to the nearest tenth. Don't forget the unit.
asked by sara 
early childhood
When children do print alphabet letters among the easiest to print are a. A and X b . O and L c. C and U d. S and M is b correct
asked by reema 
calculus
a university alumni group wishes to provide an annual scholarship in the amount of 1500 beginning next year. if the scholarship fund will earn an interest rate of 8%/year compounded continuously, find the amount of the endowment the alumni are required to
asked by soffy 
Chemistry
The decomposition of dinitrogen tetroxide produces nitrogen dioxide: N2O4 (g) > 2 NO2(g) ΔG°= 2.80 kJ/mol Find the minimum partial pressure of N2O4 at which the reaction is spontaneous if P(NO2)=2.00 bar and T=298 K.
asked by Kerrie 
Physics
A 2.5 m rod of mass M= 4. kg is attached to a pivot .8m from the left end so that it can rotate vertically. At the left end of the rod is a small object with mass m=1.5kg. A spring with a spring constant k=90N/m is attached to the right end of the rod. The
asked by Brandon w 
Algebra III
How many positive odd integers less than 10,000 can be represented using the digits 0, 3, 6 an 9?
asked by Anonymous 
Update Math Question
The area of triangle B is 64 times greater than the area of triangle A.The perimeter of triangle B is how many times greater than the perimeter of triangle A? how many times greater than the perimeter of triangle A? A. 8 times greater B.64 times greater
asked by jessica 
Math
Cassidy says that capacity is the same as the amount. do you agree? explain why or why not.
asked by Kingbla 
Chemistry
If a plant produces 8.06 mol of C6H12O6 how many moles of CO2 are needed
asked by Yolanda 
Physics
Three applied forces F1= 20N, F2= 40N and F3= 10N act on a crate with a mass of 2kg on an incline with θ = 30o, φ = 60o and μk = 0.2, find the acceleration
asked by user 
physics....
1) Yellow light that has a wavelength of 560 nm passes through two narrow slits that are 0.300 mm apart. An interference pattern is produced on a screen 160 cm distant. What is the location of the firstorder maximum? 2) A communication satellite is
asked by kennedy 
physics
What is the moment of inertia of a solid cylinder of radius R=0.9550m,thickness t= 0.015m, and total mass M= 3.565 kg?
asked by George 
Math
The measures of three angles of a quadrilateral are 80, 90, and 103 degrees. Find the measure of the fourth angle.
asked by Maquavia Mccrae 
Economics
Bank A has a leverage ratio of 10, while Bank B has a leverage ratio of 20. Similar losses on bank loans at the two banks cause the value of their assets to fall by 7 percent. Which bank shows a larger change in bank capital? Does either bank remain
asked by Alvin 
chemistry
The presence of a catalyst provides a reaction pathway in which the activation energy of a certain reaction is reduced from 188 kJ/mol to 86 kJ/mol which increases the rate of the reaction. How many times faster is the reaction with the catalyst at 307 K,
asked by Smith 
Physics
A system consists of two particles. Particle 1 with mass 2.0 kg is located at (2.0 m, 6.0 m) and has a velocity of (2.1 m/s, 4.1 m/s). Particle 2 with mass 4.5 kg is located at (4.0 m, 1.0 m) and has a velocity of (4.6 m/s, 4.6 m/s). Determine the position
asked by James 
Physics
An airplane flying at 82km/hr at 30 degrees east of north encounters a 40km/hr wind due west. What is the speed of the plane relative to the ground?
asked by M 
Math
Find the value of K such that the following trinomials can be factored over the integers: 1. 36x^2+18x+K 2. 3x^2  16x+K
asked by Raj 
physics
A satellite with a mass of 260 kg approaches a large planet at a speed vi,1 = 13.1 km/s. The planet is moving at a speed vi,2 = 10.2 km/s in the opposite direction. The satellite partially orbits the planet and then moves away from the planet in a
asked by lanre 
physics
A rock is tossed straight up with a speed of 29m/s. When it returns, it falls into a hole 13m deep. Solve for rock's velocity as it hits the bottom of the hole. &How long is the rock in the air, from the instant it is released until it hits the bottom of
asked by Amanda 
chemistry
Determine the entropy change for the following displacement reaction Cl2(g) + PbBr2(aq) > PbCl2(aq) + Br2(l
asked by lekeith 
chemistry
From the following Information, calculate the standard change of enthalpy for the combustion of coal. SHOW WORK AND BALANCED REACTION!!! Compound DeltaHf (kj/mol) Coal 0.0 Carbon dioxide 393.5 Water (l) 285.9 Oxygen 0.0
asked by Chloe 
chemistry
From the following Information, calculate the standard change of enthalpy for the combustion of coal. SHOW WORK AND BALANCED REACTION!!! Compound DeltaHf (kj/mol) Coal 0.0 Carbon dioxide 393.5 Water (l) 285.9 Oxygen 0.0
asked by Chloe 
Chemistry
For 105ml of a buffer that is .40 M in HOCL and .36M in NaOCL what is the pH after 13.4 ml of 1.5M NaOH is added? Ka for HOCL is 3.5x10^8
asked by Andrew 
chemistry
an electron jumps from energy level to energy level two by absorbing a photon of energy 8eV. What is the most likely energy of the photon that will be emitted by the electron when it moves back down to energy level one
asked by rona 
Physics
A 13.0 kg box is released on a 33 degree incline and accelerates down the incline at o.20 m/s^2. A. Find the friction force impeding it's motion B. What is the coefficient of kinetic friction
asked by Mike 
statistics
Suppose a box has eight differently colored tennis balls in it. The colors are green, blue, red, purple, orange, black, and white. if I will randomly pick out three balls (without replacement), then what is the probability that the balls chosen will be
asked by Sarah 
U.S. GOVERNMENT
1) The year that the Declaration of Independence was signed and pronounced to the rest of the world was... A) 1776 B) 1787 C) 1781 D) 1765 2)Which of the following was ratified with the assistance of adding a Bill of Rights to assure citizens that their
asked by Booker Perry 
Statistics
How is the rejection region defined and how is that related to the zscore and the p value? When do you reject or fail to reject the null hypothesis? Why do you think statisticians are asked to complete hypothesis testing? Can you think of examples in
asked by Anonymous 
College Chemistry
The initial concentration for the compounds involved in the reaction shown were determined to be [CH4(g)] = 0.6616 mol/L, [H2O(g)] = 0.8127 mol/L, [CO(g)] = 0.9566 mol/L, [H2(g)] = 0.7688 mol/L. Calculate the value of the equilibrium constant (Kc) at 1200
asked by Morgan 
Physics
A potter's wheel rotates with an angular frequency of 1.54 rad/s. What is its period?
asked by Kate 
Physics
A 25 N book sits on a table. What is the magnitude of the normal force the table exerts on the book?
asked by Rachel 
english
I am both a quick worker and careful.
asked by Anonymous 
physics
A 156 gram 8 ball rolls across a pool table at 2 m/s when it collides with a 7 ball of equal mass rolling in the opposite direction at 1.5 m/s. The 8 ball bounces backwards at 1 m/s. Find the momentum of the 7 ball.
asked by someone 
chemistry
The rate constant of the reaction between CO2 and OH  in aqueous solution to give the HCO3 ion is 1.5 1010 1/(M·s) at 25°C. Determine the rate constant at blood temperature (37°C), given that the activation energy for the reaction is 38 kJ/mol. units
asked by parker 
SCI/256 PEOPLE, SCIENCE, AND THE ENVIRONMENT
What are some social, economic, aesthetic, and ethical issues involved in a current environmental controversy? Explain.
asked by Evans 
ECONOMICS
Imagine that you manage a company that has invested $5 million in developing a new product, but has not completed development. At the last meeting, your salespeople report that the arrival of new competing products has reduced expected sales of your new
asked by JIM 
Math
Find the domain and range of the relation, and state whether or not the relation is a function. {(3, 9), (3, 10), (3, 11), (3, 12)}
asked by Anonymous 
Art
Here is the last part of the same summary. Thank you, Writeacher. 1) One day the garage owner discovers his wife’s loveaffair. To escape his violent reaction, she runs out of the house, and is run down by Gatsby’s yellow car, driven by Daisy. 2) To
asked by John 
Science
How do you test the properties of an unknown material?
asked by Lewis 
English
for narrative essay i want to write about death, like before i used to think my world be perfect everyone be with me I have everything until my great grandmother died, and that be the first time someone in my family die that i be really close to, so that
asked by Mohammad 
statistics
Suppose that a researcher is interested in estimating the mean systolic blood pressure, , of executives of major corporations. He plans to use the blood pressures of a random sample of executives of major corporations to estimate . Assuming that the
asked by Anonymous 
physics
A 3.3kg ball of clay with a speed of 14 m/s is thrown against a wall and sticks to the wall. What is the magnitude of the impulse exerted on the ball?
asked by lanre 
history Cuban Revolution please help
how did the Cuban revolution affect the Caribbean?
asked by mike 
physics
A spring with a springconstant 2.2 N/cm is compressed 28 cm and released. The 5 kg mass skids down the frictional incline of height 31 cm and inclined at a 18◦ angle. The acceleration of gravity is 9.8 m/s2 . The path is frictionless except for a
asked by melissa 
GEDWord Problems
Enrique put $300 dollars into a savings account at 5% interest per year. The earned interest on the $300 was added to the account at the end of the year. At the time Enrique made an additional deposit of $200. How much does have in his account?
asked by kayla 
ALGEBRA
Suppose an insurance agent offers you a policy that will provide you with a yearly income of $280,000 in 20 years. What is the comparable annual salary today, assuming an inflation rate of 5%?. (Round your answer to the nearest cent.)
asked by Urgen please help 
Earth Science
Which of the following processes helps to shape the landforms of Earth?  Mass movement  Glaciers  Wind  All of the above
asked by PLEASE HELP 
Math
for the curve y=2(3^x)+1, determine: the horizontal asymptote the yintercept range end behaviour also, how would i sketch this?
asked by Rebecca 
College
If the line passing through point (a,1) and (8,7) is parallel to the line passing through the points (4,9) and (a+2,1) what is the value of a?
asked by Justin 
Chemistry
why would the concentration of ascorbic acid decrease as the temperature rises? Also is there any reason that the concentration would drop suddenly at 30 C then go back up and continue to decrease evenly. ( i repeated these 3set titrations 3 times and all
asked by Aimee 
Chemistry
What massof iron is contained in 86.6 grams if FeSO4?
asked by Andre 
calculus
according to data released by the chamber of commerce of a certain city, the weekly wages of female factory workers are normally distributed with a mean of 575 and a standard deviation of 50. Find the probability that a female factory worker selected at
asked by soffy 
SS7R  ANSWER ASAP FINAL EXAM START@1:30 TODAY
what are the advantages of the north and south in the civil war and what's their strategies?
asked by Laruen 
math
What is the apr if the amount financed $3500; Interest Charged $ 675; Number of Payments 24
asked by shawn 
Algebra II
Solve 4^(x+2)= 160 How would I round this answer to the nearest hundredth? My answer was 200, I don't believe I worked the problem out correctly.
asked by Greg B. 
Physics
A sphere weighs 200N resting on a wall. It is supported by a rope 20 degrees from the wall. What will be the tension force on the rope?
asked by Jet 
ALGEBRA
(a) Write the expression in terms of natural logarithms. (Express all logarithmic functions in terms of ln(x) in your answer.) log_(8.9) \(135\) = (b) Give a calculator approximation (correct to four decimal places). log_(8.9) \(135\) ~=
asked by Urgen please help 
Geography
Growth by cell division that makes both ends of a plant longer but not wider is called A secondary growth. B annual ring growth. C vascular growth. D primary growth. is it D? thanks
asked by Alexa 
Art
Writeacher, here is a summary I urgently need you to check. Thank you. 1) Gatsby is an enigmatic figure, a mysterious “selfmade man”, who appears to have achieved the American dream of immense wealth. 2) He is the owner of a palatial mansion where he
asked by John 
CHemistry
what is a conjugate acid/base pair that would be suitable to prepare an ideal buffer with a pH more than 7? If possible can you include Ka and Kb values to explain why the pH would be more than 7
asked by Lisa 
algebra
sue nees to find the length & width of a room. the room is 4 meters longer then it is wide. its perimeter is 24 meters. what is the width?
asked by ej 
Business
According to the doctrine of supply , the amount________ will increase as the _________decreases. I'm stuck on this question. I can't seem to find it in my text book
asked by Laura 
Chemistry
why would the concentration of ascorbic acid decrease as the temperature rises? Also is there any reason that the concentration would drop suddenly at 30 C then go back up and continue to decrease evenly. ( i repeated these 3set titrations 3 times and all
asked by Aimee 
Business
I have this assignment of constructing a business plan. I have chosen to make a flower shop which sells mainly different types of flowers, flower perfumes, flower scented soaps, air fresheners, etc. Would this business be in the primary, secondary,
asked by Crissy XD 
statistics
. Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190
asked by stacy 
physical science
Which of these is the balanced equation for this reaction? A. B. C. D.
asked by kierra 
calculus
to find the possible relative extrema of the function f(x,y) subject to the constraint g(x,y)=8, the lagrangian function based on the lagrange multiplier λ is given by....
asked by soffy 
math equations
Solve x = log3 15
asked by jess 
early childhood
When learning a finger play children usually learn the first 1 actions 2 rhythm 3 words 4 rhymes is 1 right
asked by reema 
physics
A spring with a springconstant 2.2 N/cm is compressed 28 cm and released. The 5 kg mass skids down the frictional incline of height 31 cm and inclined at a 18◦ angle. The acceleration of gravity is 9.8 m/s2 . The path is frictionless except for a
asked by melissa 
Foreign languages
Writeacher, I urgently need you to check these sentences, though I believe they don't make sense. Although I'm not a mechanic, I don't think the use of scientific English is correct. 1) I would like to focus on a kind of technology which is used to
asked by John 
Medical Office Procedures
Which screen do you use to set the reason for the visit?
asked by Michelle 
DeskToping
The _______ symbol is contained on the numeric keypad. A. ) B. % C. + D. $ I got C. If you press the downarrow key ( ): A. You will jump to the previous page B. You will jump to the next page C. The inseration point will move down one line D. The
asked by Sarah 
to ms.sue
ok and thank you!
asked by Celest 
Physical Edu
The principle of progressive overload is described by an improvement in physical fitness which requires a gradual increase in physical activity and working the body beyond accustomed levels. is it True
asked by Andy 
Math
(2/3)^2 + (4)^2
asked by Rebecca 
Earth Science
How old is the Gneiss in Greenland?
asked by fred 
Math
Suppose the modified quota is 6.47. Fill in the blanks, and round your answers to two decimal places. (a) Find the lower quota. (b) Find the upper quota. (c) Find the arithmetic mean of the lower and upper quotas. (d) Find the geometric mean of the lower
asked by Randy 
math
a cshaped tile (2 in the top row, 1 on the second, 2 on the bottom) can be placed on a number chart so that the sum of the numbers covered is 29. show how this can be done
asked by nour 
Chemistry PLEASE HELP!
• A compound is known to contain only C, H, and N. • On combustion of a sample of 12.5 mg, 22.3 mg of CO2 and 15.2 mg of H2O were produced. •Use this data to find the empirical formula for the compound. (Please show working out)
asked by Kevin 
geometry
Show all work. Mary purchased a package of 15 different plants.but she only needed 10 plants for planting. In how many ways can she select the 10 plants from the package to be planted?
asked by angela 
calculus
find the average value of the function f(x,y)=e^(x^2) over the plane region R which is the triangle with vertices (0,0), (1,0) and (1,1)
asked by soffy 
calculus
find the derivative of the function f(x) = e^(3x) sec (7x)
asked by soffy 
chemistry
The firstorder rate constant for photodissociation of A is 5.97 1/h. Calculate the time needed for the concentration of A to decrease to the following quantities. a. 5% of its original value h b. onethird of its initial concentration h
asked by mel 
calculus
find the derivative of the function f(x) = x^2 cos (7x)
asked by soffy 
math
how do you graph f(x)=sin(x)5
asked by lanae 
math 2
how do you solve the fowlling question
asked by aliyah 
Quadratic Equations
The question is Is the point (3, 2) a solution of the intersection of the following set of quadratic equations: Y < X^2 X^2 + Y^2 < 16 I guess I am somewhat confused by the way it's written. Would I be graphing this to find out? I'm so confused with
asked by Greg B. 
science
an electrical energy supplied to a toy car was 240 joules.If the car weighing 40N moved through a distance of 5m,calculate the efficiency
asked by nanakofi 
math
Determine the period, amplitude and phase shift for each given function: A)y = 4 cos 3x + 5 B)y = 2/3 sin (30x90)10 c)y = 0.38 tan (x/3+pi/3) d)y = pi cos(2x)+ pi
asked by darshi 
Statistics
A stoplight at the corner of Lincolnway and Duff Avenue is red 20% of the time. For someone who drives through this stoplight 10 times a week, what is the probability that they will stop at least three times?
asked by Shelby 
ALGEBRA
If the principal P = $900, the rate r = 4 1 2 %, and time t = 1 year, find the following. (a) What is the amount of interest? $ (b) What is the future value?
asked by Urgen please help 
Foreign languages
This is the second part of the paragraph. Though I don't think it makes sense at all, I would like you to have a look at it. I added a sentence on nanotechnology I'd like you to check, Writeacher. 1) So this element of the composite torque is not under
asked by John 
Math
The perimeter of triangle B is how many times greater than the perimeter of triangle A?
asked by jessica 
math
I don't understand this question. I am suppose to be simplifying this: u^41/u^31 I put (u^2+1) (u+1)(u1) for the top but the bottom, I can't figure out why my book put (u^2+u+1)(u1) when it's only u^3...where did the extra u come from?
asked by Help 
Social Studies
Does anyone have any information about Sulawesi artifacts? I am having trouble finding facts about an ancient ceremonial mahogany grass bowl. Thanks.
asked by Jesse 
to ms.sueproject
about my summer poject, my teacher said we had to go to the library to borrow book or go somewhere to buy it.
asked by Celest 
Elementary Statistics
Given a level of confidence of 95% and a population standard deviation of 13, answer the following: (A) What other information is necessary to find the sample size (n)? (B) Find the Maximum Error of Estimate (E) if n = 82.
asked by Victoria 
Desktoping
The ______ symbol is used to represent mulitipication A. Asterisk B. At (@) C. Number (#) D. Tilde (~) I got C.
asked by Sarah 
chemistry
A solution has H+ = 5.0 ´ 10–5 M. Assume temperature of the solution is 25 Centigrade.The pH of this solution is?
asked by sidd 
chemistry
What volume of LR(Lactated Ringer's) solution would be required to make 1.0L of a solution that was .050M in chloride ion?
asked by Bill 
physics
A 58kg astronaut inside a 9mlong space capsule of mass 550 kg is floating weightlessly on one end of the capsule. He kicks off the wall at a velocity of 3.6 m/s toward the other end of the capsule. How long does it take the astronaut to reach the far
asked by lanre 
English
What does HiRobo look like? 1. He is long and strong. 2. His arm is long and strong. 3. He has a long and strong arm. 4. He has a long strong arm. (Are the answers all correct? What about #3 and #4? Which one is correct? are both OK?)
asked by rfvv 
english
i need help to finding a ballad pome
asked by idiot 
probability
two dice are tossed. find the probability that the sum is odd given that the sum is 5 or less
asked by Anonymous 
math
What is the range of f(x) = log(x – 3)?
asked by Anonymous 
history
which of the following was characteristic of the old stone age
asked by jaymoney 
physics
m1=4kg and m2=2kg and angle is 42 degrees.if the mass m2 is moving down with 0.5 m/s^2 acceleration, find the coefficient of the friction
asked by user 
math
If the value of x is 0, then what is the value of y in the function y = 3x  5x2 + 9x3  8?
asked by Anonymous 
early chidhood
It is likely that a preschooler who learns to read early 1 will watch a lot of television 2 will enjoy playing outdoors as do other children 3 will watch less tv than other children 4 will enjoy playing outdoors as do other children and will watch less tv
asked by reema 
math 2
how do you solve the fowllowing question 6+(2x7) fraction 2 over 3 =31
asked by aliyah 
geometry
L is a point on . CN = 85, CL = 32 – x and LN = 4x – 7. What is CL?
asked by Anonymous 
Math
Please round the number 43,678.426785 to the nearest ten thousand
asked by Jane 
GEDWord Problems
Taxes on lot A are $151.00 are more than on lot B. the combined taxes on the 2 lots are $1,121.00. What are the taxes for each lot?
asked by kayla 
Math
If I have 28 ft 9 5/8 inches and I need 3 equal rooms how big is each room supposed to be?
asked by Mich