physics please HELP !
130,869 results, page 94

Chemistry please help
Elemental mercury was first discovered when a mercury oxide was decomposed with heat, forming mercury metal and oxygen gas. When a 0.204g sample of the mercury oxide is heated, 0.189 g of mercury metal remains. a)what is mole ratio of mercury to oxygen in the sample? would it... 
physics
1. You are planning to build a mini hydro power plant. A river near your home is w = 4.0 m wide and h = 1.0 m deep. You measure the water flow to be v = 1.50 m/s over the brink of a waterfall H = 10.0 m high. The company that makes the turbine advertises e = 25% efficiency in ... 
Physics
A pilot of mass 65 kg in a jet aircraft makes a complete vertical circle in midair. The vertical circle has a radius of 1.70 km at a constant speed of 215 m/s. Determine the force of the seat on the pilot at (a) the bottom of the loop and (b) the top of the loop. (Note that ... 
Physics
A pilot of mass 65 kg in a jet aircraft makes a complete vertical circle in midair. The vertical circle has a radius of 1.70 km at a constant speed of 215 m/s. Determine the force of the seat on the pilot at (a) the bottom of the loop and (b) the top of the loop. (Note that ... 
US HISTORY  Help please
Which answer best explains how the Articles of Confederation addressed the question of creating a court system? The Articles established the trialbyjury system for the first time in history. The Articles created state, regional, and national courts throughout the land.*** ... 
Functions
consider the functions g(x)=(4x^2)^0.5 and h(x)=(x^2)5. find the composite functions hog(x) and goh(x), if they exist, and state the domain and range of the composite functions.  ok, i have figured out that hog(x)=1X^2, but in my answer ... 
Physics
Consider the following four possibilities for two point charges and choose the one(s) that do not change the magnitude of the electrostatic force that each charge exerts on the other: A. Double the magnitude of each charge and double the separation between them. B. Double the ... 
essay check please
This is the introduction of my essay , please check it !!!!!!!!!!!! It would really help “All men are born equally free”Salmon P. Chase. A very important character that shapes our society is equality, but many people don’t believe in it. Racism and discrimination are ... 
Spanish B
What is one of the main factors attributed to Panama's booming economy? A)The control of Los Estados Unidos over the Panama Canal. B)Panama's sole control over the Panama Canal. C)France's abandonment of the Panama Canal project. D)Joint control of the Panama Canal and Los ... 
Vector Calculus
Can someone help me with this please. A vector field in cylindrical polar coordinates is given by V = R Rˆ + R 3 s i n ( φ ) c o s ( φ ) φˆ + 3 z kˆ where Rˆ, φˆ, kˆ are the appropriate unit vectors. Translate this vector field into the Cartesian x, y, z coordinate... 
AP Physics
You go to kitchen to boil water. You pour 280 gram of water to a container, and put the container on a 293 W electric heater. Assume that all the heat from the heater is used to heat the water. The specific heat of water is 4.19 J/g ° C. As always, be accurate to 4 ... 
Physics (Help Please)
An astronaut of mass 84.0 kg is taking a space walk to work on the International Space Station. Because of a malfunction with the booster rockets on his spacesuit, he finds himself drifting away from the station with a constant speed of 0.570 m/s. With the booster rockets no ... 
Writeacher
Writeacher, Do you specialize in any particular subject? I've seen you answer to math, english, physics, etc. I'm just curious. I don't believe I've answered to any physics questions  poor student to depend on me for that!! Mostly I respond to English questions (grammar, ... 
maths
Two cyclists start biking from a trail's start 3 hours apart. The second cyclist travels at 10 miles per hour and starts 3 hours after the first cyclist who is traveling at 6 miles per hour. How much time will pass before the second cyclist catches up with the first from the ... 
Statistics
I am doing a stats study and im stuck on what test to perform. Please look at my subject and advise me.. I am testing to see whether a person that is best in math and science will be able remember more numbers than letters and if a person that is better in language and history... 
please help :)
Even though I know what random selection, directional selection, stabilizing selection, disruptive selection and sexual selection are I can not understant what does Starlings producing five eggs in each clutch has to do with it. In my final I got this question and I don't know... 
science(answer please)
please answer these 1.what similarities do nuclear energy and chemical energy share?pick all that apply A.both are types of kinetic energy. B.both are types of potential energy C.both involve magnetic energy D.both involve stored energy 3.the energy an object has due to its ... 
Honors English 10A
Can you please help me with a few more Ms. Sue? Read lines 59 from "The Olympic Swimmer." Swimmers swivel, splash, and kick Back and forth in a clear, blue pool; Like fish at play in Neptune's sea. Swimming relaxed, and calm, and free. These stars, like sharks, cut the waves... 
Quadratic Relations, Algebra, Math
URGENT!! PLEASE HELP In a volleyball match. Jenny serves the volleyball at 14m/s, from a height of 2.5m above the court. The height o the ball in flight can be estimated using the equation h=4.9t^2+14t+2.5, where h is the height, in meters, and t is the time, in seconds, ... 
Physics
A sanding disk with rotational inertia 1.1 x 10^3 kg*m^2 is attached to an electric drill whose motor delivers a torque of 6 Nm about the central axis of the disk. What are the following values about the central axis at the instant the torque has been applied for 185 ... 
physics
a sea saw consist of a uniform bar 4m long and of mass 2kg. a boy of weight 42N sits at end of the sea saw while another boy of weight 38N sits at the end of the season. at what point must the season be pivoted if it is to balance. according to physics 
physics
I do not understand the answer that was given to me on a post dated Nov. 23. Please help explain my questions that appear at the end of this post. Bart  Posted by Bart on Wednesday, November 23, 2011 at 6:52am. A baseball is hit with a speed of 27 meters per... 
MATH!
PLEASE HELP! Okay I'm DESPERATE. Can somebody please tell me what n^364 divided by n4 is? And for x/x+2  4/x2  1 is the answer 2(3x+2)/(x2)(x+2 n^364 is a difference of cubes: you should have an equation to factor it. http://www.purplemath.com/modules/specfact2.htm No... 
Physics
The human brain consumes about 21.3 W of power under normal conditions. (More power may be required during exams...) How long can a candy bar (299 Calories) power the normally functioning brain? Note: The nutritional Calorie is equivalent to 1000 calories, or 1 kcal, as ... 
Early Child Ed.
Would you check these questions and my answers,please? 1. Stories such as "The Three Little Pigs,""The Billy Goats Gruff," or Dr. Seuss books,promote children's cognitive and linguistic skills through the _____________ strategy. A. repetition B. eventcasts C. referential ... 
Physics
A 855 N crate rests on the floor. a) How much work is required to move it at constant speed 7.7 m along the floor against a friction force of 180 N? b) How much work is required to move it at constant speed 7.7 m vertically? I really NEED help I am very lost with physics!!!! 
chemistry HELP PLEASE !
A solution consisting of isobutyl bromide and isobutyl chloride is found to have a refractive index of 1.3931 at 20oC. The refractive indices at 20oC of isobutyl bromide and isobutyl chloride are 1.4368 and 1.3785, respectively. Determine the molar composition (in percent) of ... 
Simplify
Simplify the following number. ∛729 I think it is ∛9, but I do not know. Please help, and check my answer. I will appreciate it if you guys can answer this as soon as possible. It is part of a RATIONAL EXPONENTS question. The original equation was 9^(1/3)∙&#... 
Physics...help please!
A body of mass m moves in the +x direction, subject only to drag force: Fx= (1/2)(CD*rhoair*S*vx^2) With drag coefficient CD, air density rho air, cross sectional area S, and velocity component vx. At time t=0 the body is at postion x=0 and has velocity of vx=v0 where v0 is ... 
Physics...help please!
A body of mass m moves in the +x direction, subject only to drag force: Fx= (1/2)(CD*rhoair*S*vx^2) With drag coefficient CD, air density rho air, cross sectional area S, and velocity component vx. At time t=0 the body is at postion x=0 and has velocity of vx=v0 where v0 is ... 
Physics
Speed of a satellite orbit (physics problem)? What is the speed of a satellite in a geosynchronous orbit about Earth? _________m/s Compare it with the speed of the Earth as it orbits the Sun. _________m/s 
Geometry help
Points EC bisects points AD at C. For each of the following, find the value of 'x' and the measure of the indicated segment. Please correct me if I'm wrong! 1. AC= 3x+6 and CD=2x+14 x=_______ AC=______ Answer: x=8 AC= 30 2. AC= 5x8 and CD=163x x=______ AD=_____ Answer: x=3 ... 
Physics Elena please help! I'm so confused!!
A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 21.0° with the horizontal. A 37.0 kg piece of luggage is placed on the carousel, ... 
Physics
A block is attached to a spring and set in motion on a horizontal frictionless surface by pulling the block back a distance 10cm from equilibrium. Now, replace the block with one double the mass and set the block into motion again by pulling the block a distance 10cm from ... 
poetry, please comment
The Abuse Ends Now by: Kathy A I wasn't enough So he became rough I'm just not that tough As he was handcuffed I saw his face I hoped he knew he was a disgrace After all this time of looking into those deceiving blue eyes I just sit and cry Because of every single lie The last... 
Some Please Help me  PreCalc
Verify that the point ( square root(31)/7, 3square root(2)/7 ) lies on the graph of the unit circle. If it does, use symmetry to find three other points that also lie on the graph of the unit circle. (direction  Type ordered pairs). PS: The 3 is outside the square root ( ... 
physics PLEASE HELP
I know its hard me explaining: In a problem I have it shows a picture of wave and shows the horizontal displacement from the halfway point of one peak of one wave to the halfway point of the trough right next to it. The choices are A: wavelength/2 B: wavelength C: 2 X ... 
English Please Help
Please I need some help. I'm struggling really bad with my paper for english. Paper is on "War as a social disease". We cant use no physical characteristics or traits. Or use the word people or children. How does fear relate to war as a social disease? We can't use no examples... 
Physics drwls please help
A certain CD has a playing time of 80 minutes. When the music starts, the CD is rotating at an angular speed of 4.8 x 10^2 revolutions per minute (rpm). At the end of the music, the CD is rotating at 2.1 x 10^2 rpm. Find the magnitude of the average angular acceleration of the... 
english
Hi I have some questions and I would really if you answer my questions! I want to be Nurse Practitioner and I am very passion about it. But I have a lot of problems. First English is not my native language, second I am not good at math, third I am kind intimidated by the ... 
physics
As a contrast between the old and the modern and between the large and the small, consider the following: In old rural England 1 hide (110 acres) was the area of land needed to sustain one family with a single plough for one year. (An area of 1 acre is equal to 4047 m2.) Also... 
Science please help
Draw Bohr diagrams of a magnesium atom bonding with fluorine atoms. Draw atoms then electron transfer and finally the ions that form. What type of bonding occurs? Draw Bohr diagrams of 2 hyrdogen atoms bonding with an oxygen atom by sharing electrons to form a water molecule. ... 
Physics
Please help me! 1)1. Two charged point bodies are placed into the opposite on diagonal vertices of a rectangular with sides of 6 and 8 cm in vacuum – Q1=3.2x1011 C; Q2=4.267x1011 C. Calculate the electric field intensity at two other vertices of the rectangular and the ... 
Physics, please help today!
0.0100kg particles have been glued to a rod of Length L=6.00cm and negligible mass and can rotate around a perpendicular axis through point O at one end. How much work is required to change the rotational rate (a) from 020.0 rad/s, (b) from 20.0 rad/s to 40.0 rad/s, and (c) ... 
Comprehensive science ADV
Overview: Enviromental problems, Endangered animals are becoming endangered one of the examples are the panamian godlen frog. And when i posted the first question it was the wrong one!! The real one is... Question: Describe What is being done to save endagered frogs. for ... 
English
Can you please check this short letter of enquiry, please? 1) My husband and I are looking for a double room plus an extra bed for my sixyearold child for 14 nights from 4 July to 18 July. 2) In particular, we would like to know your rates in half board (breakfast/dinner) ... 
grammar punctuation
Fine the error in punctuation or capitalization 1. "After you've rested," Frank said, "please help me move these boxes." "Can we wait until later?" asked Emily. "I have a lot of homework." "It won't take very long." replied Frank. (my choice) Emily told him that she would be ... 
AP WORLD HISTORY HELP
I read this section, still don't get it. Respond to the following questions from Duiker p. 186. Please be sure that you respond to each question fully for full credit. Please note: in order to respond to the following questions you should have read the chapter and have an ... 
Algebrato Bob (Please)
Bob, thank you for the info. You always make everything sound so easy. Yu are so smart! And, I am not! If you will, please answer further. For example the first number is 1415926535, when it says make a graph fo the frequency of each digit. I look through the other 99 numbers ... 
Chemistry(Please check)
. Ksp for Fe(IO3)3 is 1014. Two solutions, one being iron(III) nitrate and the other being sodium iodate, were mixed. At the instant of mixing, [Fe3+] = 104M and [IO3] = 105M. What happens? My answer is that a precipitate forms because Qsp > Ksp. Would you agree? ... 
Math Please check
The electricity meter on Donna's house read 71,236.4 kwh at the beginning of March and 73,196.2 kwh at the end of March. She pays 7.4 per kwh. What is the amount of her electricity bill for March? Round to the nearest cent. I came up with $145.03 Would you please check to make... 
Math (Please help!!)
Given A(4,2), B(44), and C(18,8, answer the following questions Write the equations of the line containing the altitude the passes through B in standard form. Write the equation of the line containing the median that passes through point C in slopeintercept form Write the ... 
Physics
For a question in physics... I was told to draw a graph of vertical displacement, y, versus time, t, in 2sec increments from 0 to 1.8. What was given to me was: v_yo_= +10m/s v_xo_= +5m/s a_y_ = 10m/s^2 So I used the formula: y=vo+1/2at^2 I drew the graph, and got a parabala... 
Physics
Archimedes principle. The weight of the bouy is given, so the weight of water displaced by the submerged part of the bouy equals that. Figure the volume that weight of water displaces, then figure the height of a .33m diameter column of water will have of that volume. A large ... 
Pre ALGEBRA
Someone please help 2. You toss a coin 15 times. P(heads) 2/5 = • experimental; the result is found by repeating an experiment. **** • experimental; the result is based on the number of possible outcomes. • theoretical; the result is found by repeating theoretical; the ... 
Math
I don't if I'm right for these two questions i just need a check if I'm right,if I'm wrong please show me how to get that answer. Rewrite the following exponential functions as logarithmic functions a)f(x)=9^x ans:f(x) Log^1(xlog(9)) b)f(x)=(7/8)^x ans:log^1(x(log 7  log 8... 
chemistry
A proposed mechanism for a reaction is: (i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = 7.8 kJ/mol a) Which is the rate determining step? Explain why. (ii) It ... 
physics
A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.845 m/s encounters a rough horizontal surface of length scripted l = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.357 and he exerts a constant ... 
chemistry
for the equilibrium H2+CO2<>H2O+CO Kc=3.18 at 1106K. if each of the four species was initially present at 3.000M calculate the equilibrium concentration of the CO at this temperature..... OK I can get as far as equilibrium (final) H2O=3.000x CO=3.000xx H2=3.000+x CO2... 
Physics
Could someone please tell me what equations i am suppose to use to work out these problems. A capacitor in RC circuit has two overlapping plates of width 3.40 m and length 8.90 m separated by 2.60 cm. A dielectric of dielectric constant being 73.0 fills the space between the ... 
math, PLEASE HELP!
Point E(0, 2) is a vertex of square DEFG. After a 90* clockwise rotation of the square about the origin, which of the following is the location of E? A. (2,0) B. (2,0) C. (2,2) D. (0,2) Point D(3,5) is a vertex of triangle DEF. After rotation of the triangle about the ... 
Physics
To determine the location of his center of mass, a physics student lies on a lightweight plank supported by two scales L = 2.40 m apart If the left scale reads 278 N, and the right scale reads 116 N, calculate the student's mass. Calculate the distance from the student's head ... 
physics
To determine the location of his center of mass, a physics student lies on a lightweight plank supported by two scales L = 2.44 m apart. If the left scale reads 309 N, and the right scale reads 125 N, calculate the student's mass. Calculate the distance from the student's head... 
Physics
I need immediate help on these questions:. 2.a small plastic ball with a mass of 0.005kg is suspended from a thread and hangs in equilibrium as shown in the drawing below when a small rod with a 2 uC charge is brought to within 3mm of the ball a)find the tension force in the ... 
Physics
Could you please check my answers and help me out with the last two? Thanxs! 1.Carefully define the following words: distance, displacement, speed, velocity, acceleration. Does it make a difference if we designate distance as "x" or "d"? (I don't understand this question) 2.... 
Paul Martin
Who knows what website I can go to for some baby pictures of Paul Martin? It is for my social studies project. Thankz:P I did an internet check and found only pictures of the Prime Minister as an adult. I suggest you try finding a biography in your library. There is also a ... 
Math please help hurry
A submarine is travelling parallel to the surface of the ocean at a depth of 626m. It begins a constant ascent in order to reach the surface after travelling a distance of 4420m. The ascent takes 35mins. A.) what angle of ascent or angle of elevation would the submarine need ... 
physics
A 1.00 kg hollow ball with a radius of 2.2^10^1 m, filled with air, is released from rest at the bottom of a 1.50 m deep pool of water. How high above the water does the ball shoot upward if the upward force exerted by the fluid on the ball 40 N? Neglect all frictional ... 
Math ASAP please
13. Mia charges $2.25 per hour when she babysits, plus $5.00 for transportation expenses. Write a function rule to represent the amount y Mia charges to babysit for x hours. (1 point) y = 2.25x + 5.00 y = 5.00y + 2.25 y = 5.00x + 2.25 y = 7.25x 14. The sale price of ground ... 
algebra
Will someone please look over these? I am so lost on these. 1. find the domain of p(x)=xsquared+10 I said {xx is a real number 2. find the intercepts of 3x+2y=6 I got (0,3) and (2,0) 4.find the equation of (6,6)and (6,6) got y=x 7. slope and yintercept of x+2y=4 got ... 
English
Indirectly affected person 1 or group 1 when mountain climbing unprepared please help and thank you person 1 or group 1 means first person or group to be indirectly affected Indirectly affected person 2 or group 2 when mountain climbing unprepare please help and thank you last... 
writing/language arts
Hey! I'm supposed to write a 34 page essay, describing something or someplace. So I choose my balcony.. I live on the seventeenth floor and using my 5 sense I described it as best as I could :) I was wondering if you would suggest some similes, metaphors, hyperboles, ... 
Chemistry please help!
A zinccopper battery is constructed as follows at 25°C. ZnZn^2+ (0.15 M)Cu2+(3.00 M)Cu The mass of each electrode is 200. g. a) Calculate the cell potential when this battery is first connected.  i got this to be 1.14V b.) Calculate the cell potential after 10.0 A of ... 
math(please help me!!)
4x^2+20x+5y+xy *you have to factor by grouping,for more information just ask me* First, take out 4x from the first two and y from the second: 4x(x+5) + y(x+5). Then combine the 4x and the y: (4x+y)(x+5). That's your answer. thanks.  can you help me with this one? *48x^2y+20xz... 
Physics
Can you show work please..? 1. Joe is sledding down a snow hill when he collides with Mike half way down the hill. Joe and the sled have a mass of 65 kg and their velocity before the collision was 12 m/s. If Mike has a mass of 55 kg, what velocity would Joe, Mike, and the sled... 
Math
Can you please go step by step, Ill show what I did and you can correct me. The question is: a+a(x+1) My way: a+a(x+1) 2a(x+1) 2ax+2a Could someone please check over this and provide a correct answer and my error. Thanks in advance. a+a(x+1) does not equal 2a(x+1) If it was (a... 
PHYSICS helppppp
A 0.2 kilogram baseball is thrown vertically downwards towards to the same horizontal floor. The baseball possesses an initial velocity of 30 meters per second. The height is 10.00m. (A) Calculate the POTENTIAL GRAVITATIONAL ENERGY and KINETIC ENERGY of the baseball at the ... 
PHYSICS
An object is placed on an incline with friction. The incline is slowly raised from a zero degrees and at 29.2 degrees, the object begins to slide down the incline. The incline is then raised to 40.5 degrees and the object is placed back on the incline. The coefficient of ... 
statistics/please check calculations
questions reads as follows: sat scores around the nation tends to have a mean score around 500, a standard deviation of 100 points and are approximately normal distribution. a person who scores 600 on the sat has approximately what percentile rank within the population? please... 
math(check answers please)
please check my answers and thanks have a nice day. 2.which of the following ratios is equivalent to 5/20 A.1/4(I PICKED THIS) B.1/5 C.20/100 D.2/5 3.which of the following ratios is ((NOT)) equivalent to 4/8? A.1/2 B.2/4 C.20/45(I PICKED THIS) D.12/24 4.which of the following... 
physics
Decide whether each of the following statements are TTrue, or FFalse. A) Velocity antinodes of standing air waves occur at closed ends of tubes. B) Pressure nodes of standing air waves occur at closed ends of tubes. C) Velocity nodes of standing air waves occur at open ends... 
Science Please Help!!!
Which best describes a cave ecosystem? A) Plentiful food, widely varying temperature B) Plentiful food, constant temperature C) Very little food, widely varying temperature D) Very little food, constant temperature I think it's either C or D....maybe C??? Please help! (= 
please help
hi im trying to order something online im shipping it to brooklyn ny but i don't know if im apo or fpo please someone help .someone posted this but i still don't know if im apo or fpo can you tell me if im fpo or apo i live in brooklyn ny Since this is not my area of expertise... 
physics
Hello I'm having trouble with this physics question: You are examining the loss in intensity as light passes through a fibre optic cable. The input intensity is measured as 55.1 W/m2 and the output intensity as 28.7 W/m2. Calculate the attenuation of the signal in decibels (dB... 
Foreign languages
Writeacher, thank you very much! Can you please check these sentences, too? 1) They left for the supermarket a few minutes ago.My child is with them. They need to buy food for lunch and won't be back until noon. We'll spend the afternoon at home because it's scorching hot ... 
English
Help, Please! I don't quite understand what is asking in this assignment (Essay) Task: Write an essay that compares Frankenstein and his creation to a modern zombie story with the focus on how a monster might be used as a metaphor for science or scientific advances and/or how ... 
astronomy
The red supergiant Betelgeuse has a surface temperature of 3600 K. a) Using the fact that the Sun's surface temperature is about 5800 K and that its continuous spectrum peaks at a wavelength of 500 nm, find the peak wavelength of Betelgeuse's continuous spectrum. (Please enter... 
Computing: Simple Python
Hi this is the code I'm working on, but every time I run it, every character inputted is printed, so hello becomes 'h','e','l','l','o', even numbers! I can't seem to fix it so that it can be added to the list and printed normally, thanks! #Printing the original list (This was ... 
FrenchSraJMcGin
Did I translate these two sentences correctly? (please forgive my accents)I know the words that I need, but I am not sure how's the ordering in the sentence. What days do you have your french class? = Quel jours tu as un cours de francais? I have french class every monday and ... 
chemistry
i need to know if I am in the right tract please let me know...I am calulating the molality of the following exercise so I could be able to apply the formula T=Kf * molality calculate the freezing point of a solution containin 12.2 grams of benzoic acid, dissolved in 250 grams... 
English
I left out the following statements. Could you please if they are possible, please? 1) Oscar Wilde was a great novelist. Moreover/Furthermore/Further/ he wrote very funny comedies. Italy is wonderful. In addition, Italian people are very friendly. 2) This hotel is very big as ... 
math calc. asap asap please
the point on the curve is 4y=x^2 nearest to (7,2) is: this is what i did: i solved for y and I know that the there's a tangent line at (x1,y1). so using yy1=m(xx1), I found the lines of the tangent and perpendicual lines: slope is derivative so it is 1/2x1 tangent: yy1=.5x1... 
Math
Please can someone show me the steps to do this problem?? Also, please don't tell me to just google the solution because I've already tried and have tried to do this problem by myself for hours now...Thank you so much. You are measuring trees in a forest. Standing on the ... 
Math
Please can someone show me the steps to do this problem?? Also, please don't tell me to just google the solution because I've already tried and have tried to do this problem by myself for hours now...Thank you so much. You are measuring trees in a forest. Standing on the ... 
MATHS
HI linear equation help please... I have plotted known numbers into an excel spreadsheet and it shows the formula as: I am struggling to find the answer to x..?? could you go through it step by step please.....am trying to find ppm of a concentration of iron in test sample... 
Physics
The two strands of the helixshaped DNA molecule are held together by electrostatic forces as shown in the Figure 1644 in the textbook. Assume that the net average charge (due to electron sharing) indicated on H and N atoms is 0.2e and on the indicated C and O atoms is 0.4e. ... 
Physics repost
A wave traveling in the +x direction has an amplitude of 0.45 m, a speed of 6.1 m/s, and a frequency of 16 Hz. Write the equation of the wave in the form given by either Equation 16.3 or 16.4. (Answer in terms of t and x. Assume standard units.) For Further Reading Physics  ... 
French study help
Could anyone please give me some useful web site to learn and practise my french on? I have trouble with the tense, forming sentences,pronunciation etc.(I get confused over these stuff a lot.)and I am a beginner. Or if anyone have any advise on learning french,other than ... 
Math Please check
A package of 16 tea bags costs $2.29. Find the unit price in cents per tea bag. Round to the nearest tenth of a cent. I get 14.3 cent Will you check to make sure I am correct? How do I round it to the nearest tenth? Or is it already rounded to the nearest tenth? Please help! ... 
Physics
two students working on physics assignment to find out how far window is from the roof of a building drop a ball over the edge of the roof the ball takes .1 seconds to travel from the top of the window to its bottom of a distance of 1 m assume the acceleration of gravity to be...