Monday

July 28, 2014

July 28, 2014

Total # Posts: 6,197

**Chemistry**

How many more grams of Li SO4 can you dissolve in 250g of water at 10.0 degrees C than at 50 degrees C. The solubility is 35.0 at 10 degrees and at 50 degrees C it is at 32.5. Thanks DR Bob for all your help.

**Math (URGENT)**

I understand why the vertex is there, I just don't understand what you mean by completing the square.

**Math (URGENT)**

How to graph this: Step 0: y=x(x-4) Step 1: y=x^2-4x What's next? Calculator shows vertex at (2,-4) I asked before, but I'm still stuck. Please help. thanks.

**chemistry**

Dr Bob, could you please tell me if this is right. Thanks again. Molar Mass of Na = 22.990 Cl = 35.453 NaCl = 58.453 g/mol Change g to moles……. moles= grams/molar mass = (25g) / 58.453 g/mol = 0.427moles Then M = moles/L = .427 moles/ 0.0105 = 406.66

**chemistry**

An aqueous solution is 25 % mass % NaCI. The density of the solution is 1.05g/ml. What is the molarity of the solution?

**chemistry**

How would you prepare 1.00 L of an alchol water solution that is 5.00 vol % alchol.

**chemistry**

How many more grams of Li SO4 can you dissolve in 250g of water at 10.0 degrees C than at 50 degrees C.

**Math (URGENT)**

How to graph: y=x(x-4) Calculator shows the vertex at (2,-4) Can someone explain why? Thanks.

**Math**

Simplify: y=x(x-4) little help please. thanks.

**chemistry**

Exactly define the number of hydrogen and hydroxide ions at pH 6. What about pH 8?

**chemistry**

4284.416. but what unit would it be in?

**chemistry**

If a gram of water at sea level is heated from 37 degrees Celsius to 101 degrees. How much heat would be absorbed by the water?

**Math**

I have 6 pairs of socks lying unmatched in my dresser drawer. Each pair is a different color(brown, black, red, yellow, green, and purple). When I wake up in the morning, I randomly grab 2 of the loose socks and put them on without looking. If 2 socks are randomly selected fro...

**Physical Chemistry**

Derive an expression for number of electrons N(E) with energy that can escape from a metal in terms of Z(E) (density of state) and F(E) (Fermi-dirac function) and ф (work function).

**Science**

Which of the following is visible to a person only because light from another source reflects off it? - lightning - flashlight - cloud - sun

**Calculus**

(a) Find the Riemann sum for f(x) = 7 sin x, 0 ≤ x ≤ 3π/2, with six terms, taking the sample points to be right endpoints. (Round your answers to six decimal places.) I got 3.887250 as an answer, but that's not right. (b) Repeat part (a) with midpoints as ...

**Math**

Record 7 digits (0-9) in ascending order that have a mean of 3 and a median of 1. Explain how to come up with the answer as well please and thank you.

**Math**

Record 7 digits (0-9) in ascending order that have an inter-quartile range of 4.

**physics**

A large, solid metal sphere is suspended from a the ceiling by a cable, and is free to rotate about the wire. If the mass of the sphere is 176 kg, its radius is 0.7 m, and it is initially rotating at 28 rpm (revolutions per minute), what work is required to increase its rotati...

**History**

Please Help. How did the Islamic Slave Trade change the existing system?

**History**

Please Help. What was one of the powerful movements that transformed European society during the early modern era? Between the 16th and 17th centuries.

**History**

Please Help. I would like to ask if it would have been possible with out the prior development of the Enlightenment? For instance, if some of the main issues that troubled Martin Luther (such as the Catholic Church's practice of requiring "tributes" for pray and/...

**History**

Please help. What was one of the powerful movements that transformed European society during the early modern era?

**Calculus**

A stone is dropped from the upper observation deck of a tower, 200 m above the ground. (Assume g = 9.8 m/s^2.) a)Find the distance (in meters) of the stone above ground level at time t. b)With what velocity does it strike the ground? (Round your answer to one decimal place.) c...

**US history HELP**

From late 1941 into early 1942, World War II in the Pacific experienced a succession of Japanese victories that saw numerous Allied outposts fall.

**Health**

Does Sickle Cell Disease involve a single gene or entire chromosome?

**economics**

since the AC curve in the problem is upward-sloping everywhere, it is not possible to construct a zero-profit equilibrium given the assumptions of the problem (this outcome requires a U-shaped AC curve). this problem will consider an alternative example where a long-run equili...

**economics**

Q AC MC 1 4 12 2 8 20 3 12 28 4 16 36 5 20 44 6 24 52 7 28 60 8 32 68 9 36 76 suppose that there are 70 firms in operating in the industry. using the MC curve, find out how much output in total is delivered to the market at each price (you only need to consider prices equal to...

**spanish**

Could anyone please tell me why these sentences are grammatically incorrect please 1. Queremos nuestros hijos tienen maestros buenos y competentes. 2. Esto requiere el gobierno a gastar más dinero. 3. El que me preocupa es que no tenemos suficiente dinero. 4. Es importa...

**computer**

How does a computer generated animation work? (Points: 5) The computer creates constant movement in the characters. The computer, along with human workers, moves the characters on the screen. The computer creates a set of continuous movements, one character at a time. The comp...

**computer**

What graphics program would you use to create a vector-based graphic that is easily resizable? (Points: 5) CAD Draw Paint Photo-editing im confused between A and C

**Computer**

If you want to create images that can be easily resized, or one that looks like it was created with a pencil or pen, you should choose a __________ graphics package. (Points: 5) bitmap-based colorized raster-based vector-based Is it D

**computer**

plz help

**computer**

Which type of graphics file format keeps track of each individual point in the image? (Points: 5) Bitmap Detailed image Pointilated Vector is it "Vector"

**Social Studies**

Eli Whitney revolutionized industry in the north and south and impacted the Civil War. What 2 key innovations is he attributed with?

**omputer**

THank you so much

**omputer**

The process called __________ marks a particular part of the document for special processing. (Points: 5) blocking editing identifying selecting is it D? im confused betweem B n D

**computer**

A collection of integrated software is called a software: (Points: 5) congregation. family. office. suite. im confused about this one i think its D

**computer**

What type of software is provided with the expectation that the users will change it to meet their particular needs? (Points: 5) Commercial Software Open Source Software Public Domain Software Shareware is it "Open source software" im confused

**computer**

2. _____is applications software designed to help users be more efficient. (Points: 5) a.Assistance software b.Efficiency software c.Productivity software d.Software suites is it D

**calculus**

Hydrocodone bitartrate is used as a cough suppressant. After the drug is fully absorbed, the quantity of drug in the body decreases at a rate proportional to the amount left in the body, with constant of proportionality . Suppose that the half-life of hydrocodone bitartrate in...

**math PLEASE HURRY**

72magnets

**chem**

51.33 mL

**physics**

Two cars leave the same point at the same time, each travelling at the same constant speed and each having the same mass. The first car drives directly east, while the second car heads directly north. If the centre of mass of the two-car system is travelling at 51 km/h (i.e. t...

**Calculus**

Find the rectangle of largest area that can be inscribed in a semicircle of radius R, assuming that one side of the rectangle lies on the diameter of the semicircle. NOTE: Let L denote the length of the side that lies on the diameter and H denote the height of the rectangle. Y...

**Math**

Suppose 8 out of every 20 students are absent from school less than five days a year. Predict how many students would be absent from school less than five days a year out of 40,000 students.

**computer**

Which of the following operating system types is used in PDAs? (Points: 5) a.Multi-user/multi-tasking b.Real-time c.Single-user/multi-tasking d.Single-user/single-tasking is it B

**computers **

plz help

**computers **

Which of the following operating system types is used in medical equipment or a cash register? (Points: 5) a. multi-user/multi-tasking b. real time c. single-user/multi tasking d. single user/single tasking is it A

**social studies.**

15 is C 16 is D I am pretty sure that these are your answers.

**physics help please**

What are the small-amplitude period and frequency of a 10.0 m long pendulum?

**math**

So: 47 137 227 317 Do I need to add +360n?

**math**

tan(2theta-34degrees)=squareroot3, theta range{real numbers of degrees}

**math**

So: 47 137 227 317 Do I need to add +360n?

**math**

sgr2 sinD cosD=sinD

**math**

The points (−12, 20), (0, 5), (42, −3) lie on the graph of f. List three points on the graph of g(x) = 10 − 2f(−3x).

**Physics**

At a particular instant, a stationary observer on the ground sees a package falling from a moving airplane with a speed vobserver at an angle θ to the vertical. To the pilot flying horizontally at a constant speed relative to the ground the package appears to be falling v...

**Physics**

A boat heads directly across a river with a velocity of 12 m/s. If the river flows at 6.0 m/s find the magnitude and direction (with respect to the shore) of the boat's resultant velocity.

**maths**

add all the numbers and divide the answer by 11

**Algebra 2**

The perimeter of a rectangle is 122m. The length of the rectangle is 11m less than 5 times the width. Find the dimensions of the rectangle.

**Europe in the 19th century**

huh? What sites?

**Europe in the 19th century**

I have to write a paper on the changes of labor relations in the quarter century before WWI. So far I can only think the journeymen and master craftsmen, and how the journeymen doesn't have to depend on the master anymore. What other changes in the labor relations are there?

**marketing**

How do consumption habits for products such as Scotch whisky vary from country to country? Why are some spirits products and brands strictly local, while some have global potential?

**math**

3/9 divided by 7/8

**math**

If there are exactly 5 times as many children as adults at a show, which of the following cannot be the number of people at the show?

**math**

In a class of 29 children, each of 20 children has a dog and each of 15 has a cat. How many of the children have both a dog an a cat using Vinn Diagrams

**calculus**

Find the inflection points of f''(x)= x(x+1)(x-2)^2. Explain

**science**

Hi

**calculus**

Lim (1+(a/x))^(bx) x->infinity I'm having a lot of trouble with this limit.

**Chemistry**

I understand that it is 30C, but what equation would one use for this?

**Chemistry**

10 mL of 60oC water is mixed with 10 mL of 0oC water in a perfect calorimeter. What is the final temperature?

**Translation**

I am in a translation class and the sentence contains this phrase can you tell me what it means The city was brutal in its reaction wiping 50 3/4p off the share price what does 50 3/4p stand for

**physics**

You jog at 6.2 mi/h for 5.0 mi, then you jump into a car and drive for another 5.0 mi. With what average speed must you drive if your average speed for the entire 10.0 miles is to be 10.6 mi/h? I don't get why the answer isn't 15.

**chemistry**

Using a coffee-cup calorimeter, it is found that when an ice cube with a mass of 24.6 g melts, 8.19 kJ of heat are absorbed. (a) Calculate the change in enthalpy per gram and per mole of water. (b) Write the thermochemical equation for this physical change. (c) What mass of ic...

**chemistry**

When 1.50 g of calcium chloride is dissolved in 150.0 g of water, the temperature of the water rises from 20.50°C to 22.25°C. Assume that all the heat is absorbed by the solution. (a) Calculate the heat of solution per gram and per mole of CaCl2 that dissolves. (b) Is ...

**math**

From 1950 to 1970,some glaciers in Alaska thinned by an average of 1.7 ft per year.What was the change in glacier thickness during this period?

**History**

Please Help? What impact did Niccolo Machiavelli have on events during his days?

**History**

Please help How does Niccolo Machiavelli fit the Renaissance mold?

**chemistry**

Cl- => Atomic number 17 - 10 (Core electrons from [Ne] = 7 K+ => Atomic Number 19 - 18 (Core electrons fom [Ar] = 1

**Logic**

Im guessing its No he doesnt teach 8th grade because he doesnt carpool with Chris...but this is a little tricky to me

**Logic**

Gene will teach 7th grade of Gene will teach 8th grade. If Gene teaches 7th grade, he will be assigned to the Sunset Road School. Gene will carpool with Chris if he is assigned to the Sunset Road School. If Gene teaches *th grade he will have his daughter Briana in his class. ...

**physics**

Hello, I'm trying to figure out which of the following statements are TRUE. I suspect that 2, 6, 8 are true...and that there is one more that is true, but not sure which one? Thanks! It is impossible to have a collision between two objects in which the center-of-mass of th...

**math**

if I leave home to go to the beach and at 7:05 am I am 1/3 of the way there. At 7:25am I am 3/4 of the way there. What time will I arrive at the beach.

**Chem 101**

Using the "Unit conversion method", derive an equation to calculate the heat required to raise the calorimeter to the maximum temperature.

**criminal law**

typically the chronological, ______ of a child is used to determine criminal responsibility rather than mental capacity. a. age b. well being c. health d. sanity im confused between A and D

**criminal law**

conspiracy is an ______ crime a. accessory after the fact b. general intent c. specific intent d. structure is it B

**criminal law**

the law will not punish an ______ act a. ignorant b. reckless c. involuntary d. premeditated i think its C

**Psychology**

i think its C

**physics**

5.82N

**calculus**

f(x) = ln x, [1, 6] If it satisfies the hypotheses, find all numbers c that satisfy the conclusion of the Mean Value Theorem. (Enter your answers as a comma-separated list. If it does not satisfy the hypotheses, enter DNE).

**psychology**

1. psychologists who believe in _____ are most likely to attempt to understand diversity in ethnic background as an influence on behavior: a. individual differences b. free will c. determinism d. universal principles is it "A" 2. Dr. Hall believes that thought proces...

**Psychology**

1. Often called the "father of modern psychology." William Wundt painstakingly examined the small pieces of behavior. He was not interested in personality mental disorders. He did study the cognitive elements of: a. thinking, perception, and consciousness b. hearing,...

**Psychology**

1. Samantha is suffering from fatigue and sometimes cannot make herself get out of bed in the morning. She feels that the world is a sad, unhappy place and would like to be relieved of her existence. Dr. Powell and Samantha examine her feelings very closely and consider the re...

**calculus**

a splenical ballon is being inflated @ 10 cubic inches per secound. how fast is the radius of the ballon increasing when the surface area of the ballon is 2 pi square inches( answer to 4 decimal places)?

**Grade 11 physics**

a string can hold up 12 kg without breaking. You tie the string to a 30kg object sitting on ice and use it to pull the object horizontally 22m. Calculate the minimum possible time to complete the task

**physics**

A 95kg box initially at rest on a horizonal floor requires a 650N horizontal force to set it in motion. After the box is in motion, a horizontal force of 560N keeps it moving at a constant velocity. Determine uS and uK the clock and the floor.

**algebra**

i have tried alot of different ways of doing this problem but i cant find the right answer. QUESTION:2and2/3 plus 2/3 plus 1and1/3

**math**

if their are 72 students 2/3 of the students are 12 years old how many are 12 years old

**Chemistry**

Given that Kw for water is 2.4× 10–14 at 37 °C, compute the pH of a neutral aqueous solution at 37 °C, which is the normal human body temperature.

**chemistry**

[H+]= [ClO4-]= [OH-]=

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