Friday
July 25, 2014

Posts by Rachel


Total # Posts: 1,179

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 f...

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 sla...

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 th...

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 als...

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...

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 c...

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 Je...

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 do...

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. wi...

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 deci...

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 t...

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 elect...

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 (cons...

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?

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 bo...

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'...

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...

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 ...

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.

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

English
It was impossible for him to come. What part of speech is "impossible" in the previous sentence?

English
In the sentence "He was made clean." what part of speech is clean?

math
528

Algebra-Please help
so the answer is x = 6 according to what you're saying? and the domain is the (h) in here correct? So in the future I just look for the h , take the opposite and that is my domain?

Algebra-Please help
Where do I look for the domain in this- The domain of y =1/(x-6) + 3 Possible answers: All real numbers except x=6 All real numbers except x = -6 All real numbers except x=3 All real numbers except x= -3 Thank you

Algebra
Is there an easier way to do this? "A freight train leaves a station at 4:00 p.m. traveling at 30 kilometers per hour. A passenger train leaves 1 hour later, traveling at 50 kilometers per hour. At what time will the passenger train overtake the freight train?

5th grade math
3/6 - 2/6 = 1/6

Physics
Consider a version of the atwood machine in which the masses are frictionless incline. The mass sliding on incline 1, m1, is 1.5 kg, and the angle of this incline is 62 deg. If the mass on the second incline, m2, is 2.5 kg, what is the angle 2 so that the system does not accel...

math
how to make 29 9ths a mixed number

English
with my irl

Physics
Describe how an electroscope works?

algebra 2
The length of a rectangle is 5 less than 3 times the width. If the perimeter is 54 units, what is the length and the width?

algebra
combine and reduce 6b/3a + b/a = answer 3b/a

mrs. sue please read (History)
What about for single parents?

History quick question
Did people back in the 1700's use financial aid/assistance.?

huckleberry finn
thrashed (25) cowhiding (25) licked (26) skinned stonned tanned I do not know the page numbers for the last 3

Chemistry
Explain why CH2ClBr and CH2Cl2 do not have optical, geometric, or structural isomers?

physics
how many lunar radii are in one AU?

More Frequency - Physics
A guitar player plucks two strings simultaneously. One string is tuned to a (fundamental) frequency of 381 Hz. It is found that beats are audible, with a beat frequency of 5.54 Hz. What are possible values for the frequency of the other string? (Answer the larger frequency fir...

Frequency - Physics
An organ pipe that is closed at one end has a fundamental frequency of 128 Hz. There is a leak in the church roof, and some water gets into the bottom of the pipe, as shown in the Figure. The organist then finds that this organ pipe has a frequency of 217 Hz. What is the depth...

math
Ms. Gutierrez needs to order rope for her gym class of 32 students. Each student will receive a piece of rope that is 5 feet 8 inches long. What is the total length of rope Ms. Gutierrez needs to order for her class?

Math
Rationalize the denominator. Assume all variables represent positive numbers? - 245x3 y5

physics
How much work must be done to stop a 1040 kg car traveling at 111 km/h?

Algebra
Show that two WRONG's can make a RIGHT. Replace each different letter in the addition problem with a different digit. It is required that O=zero.

Chemistry
Cobalt-60 is a radioactive isotope used to treat cancers. A gamma ray emitted by this isotope has an energy of 1.33 MeV (million electron volts; 1 eV = 1.602 multiplied by 10-19 J). What is the frequency (in Hz) and the wavelength (in m) of this gamma ray?

algebra 2
can you answer this question? a store is offering a discount of 30% on a suit. There is a sales tax of 6%. A) using a composition of function, represent this situatio in which the discount is taken before the sales tax is applied. B) using a composition of functions represent ...

sociology
Ok thank you so much for the help!! This is how I described the difference between them. Deviance-In a sociological context describes actions or behaviors that violate cultural norms including formally-enacted rules as well as informal violations of social norms. It is the rec...

sociology
What is the difference between deviance and nonconformity?

math
not sure!

math
solve for x: 2xcubed+18x=-15xsquared

chemistry
For each of the following acid-base reactions, calculate how many grams of each acid are necessary to completely react with and neutralize 2.1g of the base. 1) HCl(aq)+NaOH(aq)-->H2O(l)+NaCl(aq) 2) 2HNO3(aq)+Ca(OH)2(aq)-->2H20(l)+Ca(NO3)2(aq) 3) H2SO4(aq)+2KOH(aq)-->2...

chemistry
Determine the theoretical yield of C when each of the following amounts of A and B are allowed to react in the generic reaction: A+2B-->3C 1) 1mol A; 1 mole B 2) 1mole A; 3 mole B 3) 2mole A; 2 mole B 4) 32mole A; 68 mole B

chemistry
the value for the Ksp of silver chromate is reported to be 1.1 x 10^-12. in a saturated solution of silver chromate, the silver ion concentration is found to be 2.5 x 10^-4M. what must the chromate ion concentration be?

Geometry
A farmer uses 140 ft. of fencing to enclose a rectangular field. if the ratio of length to width is 3:4, find the diagonal of the field. Any help is appreciated, thank you!

French
Can you check these thanks. Le métro Directions: Completez 1. Il y a dix tickets de métr dans un ----------. Answer: carnet 2. On peut acheter des tickets au ----------- ou au -------------. Answer 1: guichet Answer 2: distribueur automatique 3. Les voyageurs att...

chem
How do I figure out the final Fe?

chem
A 455-g chunk of iron is removed from an oven and plunged into 385g water in an insulated container. The temperature of the water increases from 27 degrees celsius to 89 degrees celsius. If the specific heat of iron is 0.449 J g^-1 degrees Celsius^-1, what must have been the o...

chemistry
How many calories does it take to convert 22 grams of liquid water with a temperature of 48 degrees C to steam?

science
I mean Is 2Ag+S the same as Ag2S? The 2nd 2 is supposedly a subscript

science
Is 2Ag+S the same as Ag©üS?

Statistics
IQ test scores are normally distributed with a mean of 97 and a standard deviation of 11.An individual's IQ score is found to be 123.Find the z-score corresponding to this value

physics
thanks

physics
What force is required to accelerate a 90kg bike to 20 m/s in 15 sec? I need to know HOW to do it!

physics
What force is required to accelerate a 90kg bike to 20 m/s in 15 sec? I need to know HOW to do it!

global
if you are a greek individual living under ottoman rule, what would you say to persuade a European nation to help your cause ?

physics
A 625-kg racing car completes one lap in 14.3 s around a circular track with a radius of 55.0 m. The car moves at constant speed. (a) What is the acceleration of the car?

physics
Two force vectors F1 = (2.5 N) x - (3.0 N) y and F2 = - (6.0 N) x + (4.8 N) y are applied to a particle. What third force F3 would make the net, or resultant, force on the particle zero? Magnitude ___ N Direction ___° (from the +x axis)

physics
Two force vectors F1 = (2.5 N) x - (3.0 N) y and F2 = - (6.0 N) x + (4.8 N) y are applied to a particle. What third force F3 would make the net, or resultant, force on the particle zero? Magnitude ___ N Direction ___° (from the +x axis)

chemistry
write a net ionic equation for the following: 1)Iron (III) chloride reacts with Potassium hydroxide to produce Iron (III) oxide, Potassium chloride, and Hydrogen gas. 2)Hydrochloric acid reacts with Potassium carbonate to produce Potassium chloride, Hydrogen gas and Carbon dio...

chemistry
write a net ionic equation for the following: Copper (II) sulfate reacts with Ammonium hydroxide to produce Copper (II) oxide, Ammonium sulfate, and water.

Phsyics
A bullet of mass 1.8 X 10-3 kg is moving at +500. m/s when it impacts a tree stump. It penetrates into the stump 6.00 centimeters before coming to rest. 1. Assuming the acceleration to be constant, calculate the force (including direction) exerted by the stump on the bullet.

Phsyics
A bullet of mass 1.8 X 10-3 kg is moving at +500. m/s when it impacts a tree stump. It penetrates into the stump 6.00 centimeters before coming to rest. 1. Assuming the acceleration to be constant, calculate the force (including direction) exerted by the stump on the bullet.

Phsyics
A bullet of mass 1.8 X 10-3 kg is moving at +500. m/s when it impacts a tree stump. It penetrates into the stump 6.00 centimeters before coming to rest. 1. Assuming the acceleration to be constant, calculate the force (including direction) exerted by the stump on the bullet.

chemistry
A pure copper cube has an edge length of 2.00cm. How many copper atoms does it contain? (volume of a cube = (edge length)^3; density of copper = 8.96g/cm^3 )

chemistry
thank you so much. you explain things really well!

chemistry
Lead is often found in Earth's crust as several lead compounds. Calculate the mass in kilograms of the amount of each of the following lead compounds that contains 4500kg of lead. 1)PbCO3 (cerussite) 2) PbSO4(anglesite)

chemistry
What volume of each of the following solutions contains 0.13mol of KCl? 1).345M of KCl 2)2.0M of KCl 3).895M of KCl

chemistry
How many liters of a 0.530M sucrose (C12H22O11) solution contain 1.3kg of sucrose?

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