# Posts by Rachel

Total # Posts: 1,551

**physics**

An electron moving parallel to the x axis has an initial speed of 4.82 *10^6 m/s at the origin. Its speed is reduced to 1.46 * 10^5 m/s at the point x = 2.00 cm. Calculate the electric potential difference between the origin and that point.

**physics**

A proton is projected in the positive x direction into a region of uniform electric field E = (-6.80 * 10^5 N/C at t = 0. The proton travels 6.80 cm as it comes to rest. (a) Determine the acceleration of the proton. thanks

**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...

**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?

**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 ...

**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'...

**english**

what does juliet ask romeo to do and what does she promise to do

**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.

**human resources**

LEARNING OUTCOME 1 What economic, social, and political forces have made employee training even more important today than it was in the past?

**Math**

A coin is tossed 13 times. How many different outcomes have at least 2 heads ?

**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 ...

**history**

give two reasons that chinas policy of limiting trade with foreigners ended after the 1700's

**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?

**US History**

I don't have an answer, that's the thing.

**US History**

What can you infer about Truman's successful tactic of attacking the "do-nothing congress"?

**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 separate combustion analysis experiment revealed that ...

**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 separate combustion analysis experiment revealed that ...

**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?

**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 ...

**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

**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

**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

**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

**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

**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 ...

**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 ...

**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

**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 ...

**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 ...

**physics**

ok sir is the formula -(1/2)GmM/R

**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

**physics**

Thank you very much sir!

**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

**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

**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.

**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

**chemistry**

What mass of NaCl can be dissolved in 250 g of water at 20 degrees C?

**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, ...

**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

**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 ...

**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, ...

**Science**

To disinegrate due to mixing with a fluid

**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.

**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...

**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

**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

**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 ...

**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?

**math**

It is C 2 X (brother's age) + 3

**Med office asst**

which of the following codes should you insert in block # 217? 802.20 802.30 99204 J9293

**math**

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

**math**

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

**Chem**

how many grams of NH3 are required to completely react with 40.0 grams of NO.

**AP English Language**

1.) Repetition of "whatever is..." (more specifically anaphora) 2.) Rhetorical Question, drawing the audience into the "conversation"

**math**

What is 10-(-5)=?

**Math -Ultimate challenge puzzle**

where it says clyde- i meant claude

**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?

**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

**medical office**

what does it mean when you find a three digit code highlited in the tabular list

**chemistry**

How do you write a conversion factor relating cubic centimeters and milliliters?

**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 ...

**Statistics**

Never mind, got it!!

**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).

**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

**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.

**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 ...

**History**

What is centralization in education and what is decentralization in education. Is there a difference. Is one better than another?

**History**

what is the difference of Centralization or decentralization dealing with education?

**History**

Did the writers of the Constitution validate the ideals of the Declaration or betray them?

**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 ...

**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...

**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! :)

**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 ...

**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 ...

**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...

**earth science**

What is the most abundant fossil fuel?

**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 ...

**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 ...

**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 ...

**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. ...

**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 ...

**MATH**

(A) y=110-2.75x Then graph that. (B) 40 school days

**MATH**

(B) 40 school days

**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 ...

**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 ...

**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?

**math**

40%

**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?

**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 = ?

**Algebra 1**

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

**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.

**Calculus**

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

**Social Studies**

How did events at Chickamauga and Chattanooga affect Georgians?

**math**

how to find the height of a trapezoid with median 12 and area 84

**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 (...

**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'...

**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 :)

**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.

**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.

**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?