Thursday
November 27, 2014

Posts by Rachel


Total # Posts: 1,237

physics
(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 8.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) Imagine adding electrons to the pin until the negative charge has the very large value 2.00 mC...
March 26, 2011

math
a bag full of gum drops. 2/3 of which are blue. the red drops are 3/8 of the number of blue. There are 3 green drops. How many drops in the bag?
March 25, 2011

Science
The water molecules now in your body were once part of a molecular cloud. Only about onemillionth of the mass of a molecular cloud is in the form of water molecules, and the mass density of such a cloud is roughly 4.0×10−21 {\rm g}/{\rm cm}^{3} Estimate the volume ...
March 24, 2011

Music
Can you please check my answers. 1. A lyrical movement or piece for solo voice with instrumental accompaniment is called a/an A. ostinato. B. aria. C. operetta. D. chorus. 2. What is the difference between an oratorio and an opera? A. An opera is staged and an oratorio isn'...
March 23, 2011

english
what does juliet ask romeo to do and what does she promise to do
March 23, 2011

Grade 12 Chemistry
Determine the concentration of a calcium chloride solution if 1.75 L of the solution contains 0.125 mol of calcium chloride.
March 22, 2011

Math
A coin is tossed 13 times. How many different outcomes have at least 2 heads ?
March 22, 2011

AP Chem
A student performs an experiment to determine the enthalpy of neutralization of hydrochloric acid and sodium hydroxide. The student combines 25 mL of equimolar solutions of acid and base, both having an initial temperature of 22.5 C, in an open polystyrene calorimeter. Each ...
March 22, 2011

history
give two reasons that chinas policy of limiting trade with foreigners ended after the 1700's
March 21, 2011

Chemistry
What mass of silver chloride can be prepared by the reaction of 160.0 mL of 0.10 M silver nitrate with 120.0 mL of 0.19 M calcium chloride?
March 15, 2011

US History
I dont have an answer, thats the thing.
March 14, 2011

US History
What can you infer about Truman's successful tactic of attacking the "do-nothing congress"?
March 14, 2011

Chemisty!
a flask with a volume of 267.5 mL contains a few milliliters of a volatile hydrocarbon. after vaporizing the gas at 100 degrees C, the flask is weighed and found to contain 0.728 grams of hydrocarbon vapor at 755 mmHg. a seperate combustion analysis experiment revealed that ...
March 14, 2011

chemistry
a flask with a volume of 267.5 mL contains a few milliliters of a volatile hydrocarbon. after vaporizing the gas at 100 degrees C, the flask is weighed and found to contain 0.728 grams of hydrocarbon vapor at 755 mmHg. a seperate combustion analysis experiment revealed that ...
March 14, 2011

chemistry
A 150.0 mL flask contains 0.391 grams of a volatile oxide of sulfur. The pressure in the flask is 750 mmHg and the temperature is 22C. Is the gas SO2 or SO3?
March 14, 2011

economics
Eric borrowed 515 dollars today and has agreed to pay back in equal monthly installments over 6 years. The bank charges Eric 4.94% per year, compounded monthly. What is the amount that Eric will owe the bank at the end of month 20 (that is, after the 20-th installment has ...
March 13, 2011

English 9-Thanks-I responded under my sister's page-Sorry-
My sister also posted something today and when I went back to respond to you, I accidentally responded under her last response page-Sorry for the confusion Thanks again for all your help
March 13, 2011

English 9-WritteacherPlease recheck answer and provide some d
Another way is to put in "Sons" by John Updike and then the nexuslearning site is listed in dogpile
March 13, 2011

English 9-WritteacherPlease recheck answer and provide some d
I just put as much of thewebsite above as I could-it wouldn't allow me to actually put the entire address in
March 13, 2011

English 9-Please recheck answer and provide some d
Here is the site-I found it again-it would the usual and then-nexuslearning and then Elements of Lit with underscores between them and then hyphen and Course5 Thank you for checking this-I really appreciate it
March 13, 2011

English 9-Writteacher could youPlease recheck answer and provide some d
I put the website in the last response-I found it online for you-Thanks for any additional help you could provide
March 13, 2011

English 9-Please recheck answer and provide some d
It's a story about a father recalling details of present day son and then reverts back to himself,his dad and his dad's dad and then back to present son-so that's why I eliminated "c" The story is at nexuslearningwebsite if you're looking for it ...
March 13, 2011

English 9-Please recheck answer and provide some d
I have a question about the short story "Son" by John Updike. I have research this and read it but find it very confusing-I have two answers totally eliminated and would just like some input-Thank you so much Is "Son told in a.order from the contemporary father ...
March 13, 2011

Spanish 7th grade
The actual wording is "If something is dulce, one would probably want to drink lemonade or something sour" and I have to answer with a yes or no-That was the exact homework question-I thought it was odd so that's why I posted it
March 13, 2011

physics
Suppose a cylindrical habitat in space 7.70 km in diameter and 25.0 km long has been proposed. Such a habitat would have cities, land, and lakes on the inside surface and air and clouds in the center. They would all be held in place by rotation of the cylinder about its long ...
March 11, 2011

physics
Two hypothetical planets of masses m1 and m2 and radii r1 and r2, respectively, are nearly at rest when they are an infinite distance apart. Because of their gravitational attraction, they head toward each other on a collision course. Note: Both the energy and momentum of the ...
March 11, 2011

physics
ok sir is the formula -(1/2)GmM/R
March 11, 2011

physics
A 981-kg satellite orbits the Earth at a constant altitude of 103-km. How much energy must be added to the system to move the satellite into a circular orbit with altitude 199 km? I need answer in MJ please tell me what formula
March 11, 2011

physics
Thank you very much sir!
March 11, 2011

physics
A system consists of three particles, each of mass 2.10 g, located at the corners of an equilateral triangle with sides of 22.0 cm. Calculate the potential energy of the system. Please help me what formula to use please
March 11, 2011

physics
What is the minimum speed, relative to the Sun, necessary for a spacecraft to escape the solar system if it starts at the Earth's orbit? Please tell me what formula
March 11, 2011

PHYSICS
At the Earth's surface, a projectile is launched straight up at a speed of 8.4 km/s. To what height will it rise? Ignore air resistance and the rotation of the Earth.
March 11, 2011

PHYSICS
How much work is done by the Moon's gravitational field as a 1005 kg meteor comes in from outer space and impacts on the Moon's surface? PLEASEEEEEEEEEE
March 10, 2011

chemistry
What mass of NaCl can be dissolved in 250 g of water at 20 degrees C?
March 10, 2011

Child Care
1. The interaction between a child's biological makeup and the environmental influences that affect his or her development and behavior is called the a) balanced systems approach b) ecological systems theory c) body in the classroom analysis d) me/them dynamic 2. Alcohol, ...
March 9, 2011

Spanish-8th Grade-Please check
I have a question about the owrd cubiertos in Spanish. Does ths word include la servillete el cuchillo el vaso la cuchara el tendor OR is it just like the plate and spoon, fork, knife and NOT the vaso or servillete(napkin)? The word and transaltion is confusing me Thank you
March 8, 2011

Genetics
Question 11 (1 point) Save As the degree of relatedness within a population increases, the level of inbreeding in that population also increases. As relatedness and inbreeding go up, individuals become more similar genetically and therefore genetic variability goes down. How ...
March 6, 2011

Stats
if a researcher were studying the effects of a teaching method on patient learning outcomes, how must he or she word the research question (different from hypothesis) to use the t-test for statistical differences? What type of data must he or she collect (interval, ratio, ...
March 5, 2011

Science
To disinegrate due to mixing with a fluid
March 4, 2011

science
two equally charged spheres, X and Y, repel each other with a force of 8.0 x 10^-6 N when placed a certain distance apart. Another identical, but uncharged, sphere is touched to sphere Y and then moved next to sphere X. Calculate the electric force acting on sphere Y.
March 4, 2011

Physics
A parallel-plate capacitor is made from two plates 12.0cm on each side and 4.50mm apart. Half of the space between these plates contains only air, but the other half is filled with Plexiglas of dielectric constant 3.40. An 18.0 V battery is connected across the plates. What is...
March 3, 2011

U.S.History- 8th grade
Could someone help me with this question? Which of the following groups of workers lived in poverty? nurses unskilled workes technicians immigrants I'm torn between unskilled workers and immigrants
March 3, 2011

Medical Office Asst
On the ADA for Keith Konklin, the number 333-2589 should be placed in block A( #7 B) # 18 C0 # 19 D) #31
March 1, 2011

English
In the poem "Home Burial", who do you think was in the right, the husband Amy? I believe Amy was in the right because, he shouldnn't have walked in the house talking about the fence, after leaving his son's grave. A fence would have been the last thing on my ...
February 28, 2011

Calculus
I'm a bit confused about the average equations with integration. I need to solve this problem, and I think I'm supposed to use substitution, but I can't get it to work. The problem looks like this: z(t)=4tsin(t^2), [0,π^1/2] Any input?
February 27, 2011

math
It is C 2 X (brother's age) + 3
February 25, 2011

Med office asst
which of the following codes should you insert in block # 217? 802.20 802.30 99204 J9293
February 25, 2011

math
Radioactive radium has a half-life of approximately 1599 years. What percent of a given amount remains after 100 years?
February 24, 2011

math
Radioactive radium has a half-life of approximately 1599 years. What percent of a given amount remains after 100 years?
February 24, 2011

Chem
how many grams of NH3 are required to completely react with 40.0 grams of NO.
February 24, 2011

AP English Language
1.) Repetition of "whatever is..." (more specifically anaphora) 2.) Rhetorical Question, drawing the audience into the "conversation"
February 23, 2011

math
What is 10-(-5)=?
February 23, 2011

Math -Ultimate challenge puzzle
where it says clyde- i meant claude
February 22, 2011

Math -Ultimate challenge puzzle
andrew, bernard, and clyde are bicicling. each one is riding the bicicle of on friend and wearing the hat of another. the one who wears claude's hat is riding bernard's bicicle. who is riding andrew's bicicle?
February 22, 2011

Medical office
what does it mean when you find a three digit code highlited in the tabular list A, Poisoning B. Accident, C. Theraputic Use D. Undetermined
February 22, 2011

medical office
what does it mean when you find a three digit code highlited in the tabular list
February 22, 2011

chemistry
How do you write a conversion factor relating cubic centimeters and milliliters?
February 20, 2011

physics
A solid copper object hangs at the bottom of a steel wire of negligible mass. The top end of the wire is fixed. When the wire is struck, it emits sound with a fundamental frequency of 300 Hz. The copper object is then submerged in water so that half its volume is below the ...
February 16, 2011

Statistics
Never mind, got it!!
February 15, 2011

Statistics
On average 3 % of a certain type of TV tube burn out before their guarantee has expired. If a merchant sells 120 such tubes, find the probability that he will be forced to replace at least 3 of them (Use the Poisson approximation to the Binomial distribution).
February 15, 2011

Vocabulary
What is the best comparison of incentive is to goad as a. pontential is to mortify b. quibble is to dishearten c. flaw is to entice d. hazard is to dissuade
February 15, 2011

Calculus
Solve the differential equation. t(dy/dt) + 2y= t^3 t>0, y(1)=0 I think I solved it properly, I'm just trying to check my final solution.
February 15, 2011

History
A prince whose character is thus marked by every act which may define a tyrant is unfit to be the ruler of a [free] people who mean to be free. Future ages will scarcely believe that the hardiness of one man adventured, within the short compass of twelve years only, to lay a ...
February 15, 2011

History
What is centralization in education and what is decentralization in education. Is there a difference. Is one better than another?
February 15, 2011

History
what is the difference of Centralization or decentralization dealing with education?
February 15, 2011

History
Did the writers of the Constitution validate the ideals of the Declaration or betray them?
February 15, 2011

History
Why has this portion been taken out of the declaration of independence "He has waged cruel war against human nature itself, violating its most sacred rights of life and liberty in the persons of a distant people who never offended him, captivating & carrying them into ...
February 15, 2011

economics
Suppose you wish to invest X dollars in a bank account which pays 5% per year. You want to use this account to pay for costs that appear each year, starting with year 15. The amount you have to pay in year 15 is 276.71 and then the payments grow at a rate of 5% per year until...
February 13, 2011

math
how do you solve the exponential equation, 12^x = 14^3x? If someone could show me step by step I would greatly appreciate it. thank you! :)
February 13, 2011

Physics
Picture the following: A square with 4 point charges. Charges Q are diagonal from eachother, and charges -Q are diagonal from eachother. The length of each side is "a". One of the -Q charges is "kicked" away with an outward initial speed of V0, while the ...
February 12, 2011

Physics
Two point charges are placed on the x axis. The charge +4q is at x=3.00 m, and the -q charge is at x=-3.00. a) There is a point on the x axis between the two charges where the electric potential is zero. Where is this point? Found it to be: -1.80m b) The electric potential ...
February 12, 2011

physics
If the ball is in equilibrium when the string makes a 25.9 ◦ angle with the vertical as indicated, what is the net charge on the ball? Answer in units of µC. i know how to do this if i had the balls mass and the electric field or some other information, but im lost...
February 10, 2011

science
What role do condensation nuclei play in condensation? (cloud flormation) I did some research and found that the condensation nuclei attract water and produce condensation so would that mean my answer would be something like 'that the condensation nuclei help to form the ...
February 8, 2011

economics
Jerry is considering buying today a new bond which makes infinite annual payments. In particular the bond pays its holder 557.3 dollars one year from the day of purchase and the annual payment increases by 129.32 dollars each year thereafter. What is the maximum amount that ...
February 6, 2011

economics
In order to have money for their daughter's college education, a young couple started a savings plan into which they made intermittent deposits. They started the account with a deposit of 128.44 dollars (in year zero) and then added 421.97 dollars in year 3, and 723.46 ...
February 5, 2011

economics
Nair Inc. bought a "growing perpetuity" bond. The bond will pay 631.85 dollars at the end of year 1 and the payment will increase by 2.5 percent each year forever thereafter. Assuming the interest rate is 11.26% (forever), what is the maximum amount that Nair Inc. ...
February 5, 2011

economics
Suppose you wish to create a scholarship fund which will pay 73.43 each year for the next 14 years. If you accomplish your task by depositing a single amount today into a bank account which pays 12.91% per year, what must the deposit amount be? (Accuracy is at the second ...
February 5, 2011

Physics
An object of mass m= 4.8g and charge Q = 49uC is attached to a string and placed in a uniform electric field that is inclined at an angle of 30.0 with the horizontal (see the figure). The object is in static equilibrium when the string is horizontal. a) find the magnitude of ...
February 3, 2011

Physics
A small m = 2.00 g plastic ball is suspended by a L = 24.0 cm long string in a uniform electric field, as shown in Figure P15.50. If the ball is in equilibrium when the string makes a 18.0° angle with the vertical as indicated, what is the net charge on the ball? The ...
February 1, 2011

Physics
A small m = 2.00 g plastic ball is suspended by a L = 24.0 cm long string in a uniform electric field, as shown in Figure P15.50. If the ball is in equilibrium when the string makes a 18.0° angle with the vertical as indicated, what is the net charge on the ball?
February 1, 2011

math
40%
January 30, 2011

Calculus
Find the area enclosed by the following functions from x=0 to x=2: y=sqrt*(x+2) y=1/(1+x) I got 2/3(8)-ln3-2/3(sqrt*8) can someone please verify this?
January 30, 2011

Math
i) The two lines 4x-6y=-5, and 7x+6y=7 intersect at the point where x= and y=? ii) If the line 7x+ky=7 is parallel to 4x-6y=-5, then what is the value of k? Answer: k = ?
January 28, 2011

Algebra 1
I'm graphing linear inequalities...it says I need to do: y<2x+4 y>5 How do I do this?
January 27, 2011

Physics
An organ pipe open at both ends has a harmonic with a frequency of 480 Hz. The next higher harmonic in the pipe has a frequency of 540 Hz. Calculate the frequency of the fundamental and the length of the pipe. I know 540/480 is 9/8. I have no idea where to go from here.
January 26, 2011

Calculus
Integrate the following: sin^3 x/cosx Have attempted numerous ways but can't get anything sensible to come out of it.
January 24, 2011

Social Studies
How did events at Chickamauga and Chattanooga affect Georgians?
January 24, 2011

math
how to find the height of a trapezoid with median 12 and area 84
January 24, 2011

Chemistry
Calculate the concentrations of S2O8 2-, I-, S2O32 2- in moles per litre of reaction mixture given the following: 20mL of 0.1 M (NH4)2S2O8 added to: 20mL of 0.2M KI 10mL of 0.01M Na2S2O3 5mL 0.2% starch Also, calculate -(delta)S2O8 2- that is, how much S2O8 2- is used up (...
January 24, 2011

Chem- Dr. Bob!
Posted by Rachel on Thursday, January 20, 2011 at 3:57pm. Does anyone know where I can get an image of the valence bond model for maleic acid? ie. showing the pi and sigma bonds and indicating the hybridization (sp2, sp3.. ) OR could someone describe these things to me? I'...
January 23, 2011

Calculus
That would be great if you could! I'm working on getting the correct indefinite as you have above, but when I get it it would be great to have something to check my definite integral with :)
January 22, 2011

Calculus
Okay, so I ended up with the expression: 1/2[4/3arctan(4(x^2+1/2)/3) Can you confirm this is correct before I use the fundamental theorem of calculus to determine the definite integral please.
January 22, 2011

Calculus
Find the integral of x/ (x^4+x^2+1) from 2 to 3. I was going to integrate using the method for partial fractions but I can't factor x^4+x^2+1.
January 22, 2011

Calculus
What is the integral of 1-tan^2theta from 0 to pi/3? Using the identity tan^2theta=sec^2theta-1, I got my answer to be 2pi/3 - sqrt*3 Can someone verify this for me please?
January 22, 2011

Chem- Dr. Bob!
Oh! Okay, I'm familiar with R groups on amino acids etc.. The question just asks me to label the hybridization for each carbon and oxygen atom. So here's what I've got: The carbon atoms bonded to eachother are sp2 hybridized atoms. The carbon atoms bonded double ...
January 22, 2011

Chem- Dr. Bob!
Posted by Rachel on Thursday, January 20, 2011 at 3:57pm. Does anyone know where I can get an image of the valence bond model for maleic acid? ie. showing the pi and sigma bonds and indicating the hybridization (sp2, sp3.. ) OR could someone describe these things to me? I'...
January 22, 2011

Chemistry
Can someone please check my work? Calculate the mass of (NH4)2S2O8 needed to prepare 250mL of a 0.100M solution. I got 5.705 g. Calculate the volume of 2.00M KI needed to prepare 250mL of a 0.200M solution. I got 0.025L or 25mL. Calculate the volume of 0.100M Na2S2O3 needed to...
January 22, 2011

Chemistry
Does anyone know where I can get an image of the valence bond model for maleic acid? ie. showing the pi and sigma bonds and indicating the hybridization (sp2, sp3.. ) OR could someone describe these things to me? I'm just trying to check my work and make sure I didn't ...
January 20, 2011

statistics
Ordinal. Data is classified into two types: qualitative (aka categorial) or quantitative. Within the qualitative types, there are ordinal (which is ordered data- common ex. is sm, md, lrg- just as in your question) or non-ordinal.
January 20, 2011

geometry
How can I prove that triangle jlm is congruent to triangle ljk if line jl is perpendicular to line lm and line lj is perpendicular to line jk and line mj is congruent to line kl
January 19, 2011

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