Wednesday

February 22, 2017
Total # Posts: 3,274

**physics**

Gold, which has a density of 19.32 g/cm3, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber. (a) If a sample of gold with a mass of 8.464 g, is pressed into a leaf of 5.036 ìm thickness, what is the area (in m2) of the leaf? (b...

*September 1, 2011*

**chem**

because of the electrons they share

*September 1, 2011*

**physics**

A person on a diet might lose 1.5 kg per week. Express the mass loss rate in milligrams per second, as if the dieter could sense the second-by-second loss

*September 1, 2011*

**geometry**

@ Ms.Sue 6cm

*August 31, 2011*

**geometry**

a circle has a circumference of 6c. Find the diametermof the circle

*August 31, 2011*

**geometry**

rectangles length is 3 more than twice its width and has a perimeter of 30 centimeters find the dimensions

*August 31, 2011*

**Physics**

Two point charges, Q1 = -7.0 and Q2 = 2.0 are located between two oppositely charged parallel plates, as shown in the figure . The two charges are separated by a distance of x = 0.33m . Assume that the electric field produced by the charged plates is uniform and equal to E = 6...

*August 29, 2011*

**chemistry**

B-Mercaptoethanol is available as a 98% (w/w) solution, sp gr 1.114. What voulume is needed to prepare 0.100 L of a 50.0 mM solution. fw=78.13

*August 28, 2011*

**Chemistry**

given 6.7 grams of sodium acetate and 6.7 g of magnesium acetate, calculate the number of moles of acetate in sodium acetate. calculate the number of moles of acetate in magnesium acetate.

*August 28, 2011*

**chemistry**

if there are 8.0 mg of Na+ contaminant per liter of water sample, calculate the number of moles of Na+ per liter. Calculate the weight of Na+ in a 1L sample of water that contains 1.00 x 10^2 umol Na+/L

*August 28, 2011*

**geometry**

Angle C is an inscribed angle of circle P. Angle C measures (-3x - 6)° and arc AB measures (-4x)° . Find x. circle P with points A, B, and C on the circle and inscribed angle A C B drawn Question 4 answers -2 -4 -6 -8

*August 26, 2011*

**Chem**

Well I got Iron(3)hydroxide as a solid and NaNo3 as aqueous..... Not sure if that is right but that's my best guess as of right now....

*August 24, 2011*

**Chem**

Solid ferric nitrate and aqueous sodium hydroxide are combined with water in a test tube. A brown to red precipitate forms in the test tube. Write a complete chemical reaction that accounts for the formation of the solid.

*August 24, 2011*

**Chemistry**

A stock aqueous solution contains 348.29 grams of NaCl per 1.000L. 68.00mLs of water is added to 10.00mLs of the stock solution. What is the molarity of the dilution???

*August 24, 2011*

**geometry**

rectangles length is 3 more than twice its width and has a perimeter of 30 centimeters find the dimensions

*August 21, 2011*

**geometry**

Yeah it can. Point J is the mid-point already figured it out..

*August 21, 2011*

**geometry**

suppose point J is between points H and J. Let HJ=2x+5,JK=3x-7,and KH=18. Find the length

*August 21, 2011*

**anatomy**

where are the shoulders relative to these parts? 1. throat (inferior) 2. hip (superior) 3. ears (inferior) 4. hands (superior) 5. eyes (inferior) will someone please take a look at my answers and tell my if i am right

*August 19, 2011*

**math**

In Philadelphia the number of hours of daylight on day t (where t is the number of days after Jan. 1) is modeled by the function L(t)= 12+2.83sin(2pi/365(t-365)) A) Which days of the year have about 10 hours of daylight? B) Which days of the year have more than 10 hours of ...

*August 13, 2011*

**calc**

sin(4x)/sin(x)=4cos(x)cos(x) verify the identity

*August 13, 2011*

**calculus**

Consider a gun fired from a tower 96ft above the ground. The angle of elevation of the gun is 60 degrees, and its muzzle velocity is 1600 ft/sec (also gravity in this equation is 32 ft/sec^2). a)When does the bullet hit the ground? b)Write a parametric equation that models the...

*August 13, 2011*

**physical science 101**

A) h=0.5gt^2 40=0.5(9.8)(t^2) 40=4.9t^2 t^2=8.16 t=2.86s

*August 11, 2011*

**COM155**

Write two paragraphs about how interest rates affect our purchasing decisions. High interest rates make us stop and think, do we need this item? Is it a necessity? When interest rates are high people tend to finance things less. Why pay a lot in interest when you can just ...

*August 9, 2011*

**History**

The answer to the first question is TRUE! I hope i was able to help you!!!

*August 9, 2011*

**health**

what are possible impact of not logging off or exit from the patient's record

*July 30, 2011*

**history**

what new ideas in technology occurred during the Greco-Roman civilization?

*July 29, 2011*

**Computers**

Give an example of where you might use Word, Excel, Access, and Powerpoint other than computer class?

*July 29, 2011*

**Math**

find a quadratic equation having 3+root3 and 3-root3

*July 26, 2011*

**math**

A library crew can shelve books in six hours. Another crew can do the job in four hours. If the first crew begins and is joined by the second crew one hour later, how many hours will it take to finish the job?

*July 26, 2011*

**math**

find a quadratic function whose graph has a max of 25 and x-intercepts of -3 and 2.

*July 26, 2011*

**math**

when graphing greater than, less than, etc. do you shade and if you do which way do I shade?

*July 26, 2011*

**math**

whats interval notation?

*July 26, 2011*

**Bio**

A biologist marked a cell that he knew was about to undergo meiosis. A short time later he observed the four cells produced by the original marked cell; their chromosome numbers were 17, 17, 18, and 16. He knew these numbers indicated that something abnormal had occurred ...

*July 24, 2011*

**independent clause**

Identify the : I stood at the window, but I didn't see him.

*July 24, 2011*

**HCA/210**

For my final project, I have to develop a unique proposal that describes a new health care system. My question is, is this assignment just referring to the health insurance aspect of the health care system?

*July 11, 2011*

**Chem**

a blue solution of copper(II) sulfate is mixed with a colerless solution of sodium phosphate and a blue percipitate is formed. Using solubility rules predict the formula of the percipitate

*July 6, 2011*

**health**

compare the HITECH requirements with the goals and strategies of the original strategic framework

*July 5, 2011*

**math**

This is the problem given: The side of a hill faces due south and is inclined to the horizontal at an angle alpha. A straight railway upon it is inclined at an angle beta to the horizontal. If the bearing of the railway is gamma east of north, show that cos(gamma) = cot(alpha)...

*July 5, 2011*

**Chem**

10 grams of sodium chloride is treated with excess silver nitrate AgNO3 + NaCl =AgCl +NaNO3.. HOW MUCH IS PERCIPITATED

*July 4, 2011*

**Accounting**

you have just won the National Publisher's Sweepstakes. You have two options, you can receive ten, $500,000 semiannual payments starting today, or you can take your winnings in a lump-sum payment now based on 7% annual interest rate. Determine the equivalent lump-sum ...

*July 4, 2011*

**grammar**

interrogative

*July 3, 2011*

**History**

THANK YOU =)

*July 3, 2011*

**History**

Hello Any help would be greatful...TIA 1..What is the Agrarian Myth According from Hofstater? 2. When did the Myth 1st appear and whom was responsible for it? 3.Was there ever a time in America History when conditions corresponded to the myth? Thanks

*July 3, 2011*

**Science**

Part 1 Which of the following is a redox reaction? a. H2CO3 (aq) + 2NH3 (aq) → 2NH4+ (aq) + CO32- (aq) b. 2VO3- (aq) + Zn (s) + 8H+ (aq) → 2VO2+ (aq) + Zn2+ (aq) + 4H2O (l) d. Zn(NO) (aq) + 2NaOH (aq) → Zn(OH) (s) + 2NaNO (aq) part 2 For the redox reaction in...

*June 30, 2011*

**Chemistry**

The reaction for the metabolism of sucrose, C12H22O11, is the same as for its combustion in oxygen to yield CO2(g) and H2O(l). The standard heat of formation of sucrose is -2230 kJ mol-1. Based upon data in Table 6.2 and problem 6.75 the amount of energy (in kJ) released by ...

*June 29, 2011*

**Chemistry**

Calculate the concentrations of each of the ions in 0.25 M Fe(NO3)2. a) [Fe2+], M b) [NO3-], M

*June 27, 2011*

**science**

Which of the following best describes plasma? A) a group of super cooled particles with very low kinetic energy B) an ionized group of particles with low kinetic energy C) a gas that becomes a solid without first becoming a liquid D)an electrically charged gas with very high ...

*June 23, 2011*

**statistics**

Build a 95% confidence interval for the mean of the population from the given sample data. Assume that the population has a normal distribution. 16.4, 15.7, 16.2, 15.8 17.1 15.8, 15.9, 16.0, 16.4 15.0

*June 22, 2011*

**statistics**

Use the margin of error E = $10, confidence level of 99%, and ó = $40 to find the minimum sample size needed to estimate an unknown population mean, .ì

*June 22, 2011*

**statistics**

The weights of certain machine components are normally distributed with a mean of 9.75g and a standard deviation of 0.08g. Find the weights that separate the top 5% and the bottom 5%.

*June 22, 2011*

**statistics**

A bank’s loan officer rates applicants for credit. The ratings are normally distributed with a mean of 175 and a standard deviation of 15. If an applicant is randomly selected, find the probability of a rating that is between 150 and 200.

*June 22, 2011*

**statistics**

A final exam in Math 157 is normally distributed and has a mean of 75 with a standard deviation of 12. If 36 students are randomly selected, find the probability that the mean of their test scores is greater than 70.

*June 22, 2011*

**chemistry**

Discuss in detail, one way in which atomic nuclear decay takes place. What is the significance of atomic nuclear decay? Analyze the societal implications of using this process.

*June 18, 2011*

**math**

The graph of f (x)₌√x undergoes a vertical stretch by a factor of k, k›1.The vertically stretched graph would look the same if it had been horizontally compressed by a certain factor. Determine this factor

*June 18, 2011*

**chemistry**

How much heat flows from 20kg of 90 degrees water placed in contact with 20kg of 10 degrees water, producing a final temperature of 50 degrees? c=4186j/kgC

*June 16, 2011*

**Algebra**

A can of soda is placed inside a cooler. As the soda cools, its temperature T(x) in degrees Celsius is given by the following exponential function, where is the number of minutes since the can was placed in the cooler. T(x)=-22+44e^-0.03x Find the initial temperature of the ...

*June 15, 2011*

**chemistry**

Can you please explain the buffer system used in buffered aspirin? For example, what is the chemical formula of the buffer that is used? How does it react with the aspirin?

*June 14, 2011*

**statistics**

researchers believe a new sleep on average 10 hours per night ( µ = 10), with a population standard deviation of 2.3 hours(s=2.3) it is assume that the number of hours of sleep per night is normal distributed , however you think this drug causes people to sleep less than...

*June 13, 2011*

**chemistry**

How could you separate lauric acid from a-naphthol?

*June 12, 2011*

**Algebra**

Find the average rate of change of f(x) 3x^2-4x from x=3 to x=6 . Simplify your answer as much as possible.

*June 9, 2011*

**College Algebra**

Write the following as an radical expression. v^(4/5)

*June 8, 2011*

**chemistry**

if 10 ml of a 2M standard solution is used to neutralize 20mL of an unknown base what is the molarity of the unknown and is this standard solution an acid or base?

*June 7, 2011*

**Math**

Can (4x^3)y - 9xy^3 factor?

*June 7, 2011*

**geometry**

whats the volume of a sphere with diameter 30ft with the answer in the terms of pie?

*June 6, 2011*

**social studies**

A study of the causes of the American Revolution of 1776, the French Revolution of 1789, and the Russian Revolution of 1917 best supports the generalization that revolution is most likely to occur when

*June 6, 2011*

**History**

One of the most effective forms of resistance that slaves employed against their masters was A. earning money to buy their freedom. B. not having children. C. working slowly. D. open rebellion. I believe it's C, my book doesn't explain it in great detail so i'm ...

*June 5, 2011*

**Chemistry**

Thank you DR Bob

*June 1, 2011*

**Chemistry**

Hello Dr Bob,, I am still a little confused is this what it will look like 13.5/2.70=5 then take 5*5*5=125

*June 1, 2011*

**Chemistry**

The density of aluminum is 2.70g/cm3. If a cube of aluminum weighs 13.5 grams whatis the length of the edge of the cube. I need help with the formula to figure this one out.

*June 1, 2011*

**Math**

Find the surface area of a right octagonal pyramid with height 2.5 yards, and its base has apothem length 1.5 yards.

*June 1, 2011*

**geometry**

equation x+3y+2z=6 (6,2,3) how would you sketch the plane on a set of axes? is it supposed to look like a triangle? becuse my paper says it makes a trangular pyramid. i don't get it

*May 31, 2011*

**statistics**

A professional gambler claims that he has loaded a die so that the outcomes of 1,2,3,4,5,6 have corrresponding probabilities of 0.1, 0.2, 0.3, 0.4, 0.5, and 0.6. Can he actually do what he has claimed? Is a probablility distrubion described by listening the outcomes along with...

*May 29, 2011*

**eth 125 week7**

Part I Complete the chart following review of relevant information provided in Chapters 9 and 10 of our reading material. The first three groups are identified for you. Select a fourth group considered as Hispanic/Latino from the readings in order to complete the assignment. ...

*May 28, 2011*

**Math**

So the question is basically asking which mountains peaks can be seen from Oahu. Island Distance(Mi) Mountain Height(ft) Lanai - 65 - Lanaihale - 3,370 Maui - 110 - Haleakala - 10,023 Hawaii - 190 - Mauna Kea - 13,796 Molokai - 40 - Kamakou - 4,961 A) Radius of earth= 3960 mi...

*May 25, 2011*

**Chemistry**

Calculate how much heat 32.0 g of water absorbs when it is heated from 26.0°C to 73.5°C.

*May 25, 2011*

**history**

Describe the treatment of US citizens of japanese descent during wwII.

*May 24, 2011*

**history**

describe the treatment of us citizens of japanese descent during world war II.

*May 23, 2011*

**Math**

How do you solve 7x - (-6 - 2x) - x

*May 23, 2011*

**Civics (The American President Movie)**

Nino. No in

*May 23, 2011*

**Chemistry - DrBob PLEASE**

A glass of ice water was made by adding six 25 g ice cubes to one liter of water. If the water was initially 25C and the ice cubes were initially at -15C, what is the final temperature of the ice water? (I don't know how to get it.)

*May 23, 2011*

**Chemistry**

A glass of ice water was made by adding six 25 g ice cubes to one liter of water. If the water was initially 25C and the ice cubes were initially at -15C, what is the final temperature of the ice water?

*May 23, 2011*

**fundaents**

bobpursley, you need to read up on Mazlow's hierarchy of needs. Children's basic physiological needs must be met before they can focus on fulfilling the need to learn and grow.

*May 22, 2011*

**POETRY, PART 1**

From what I have gathered in my Penn F literature book it is B. Both connotative and denotative.

*May 20, 2011*

**statistics**

The following linear equation ,y= b0 = b1x, is a regression line with y-intercept b0 and slope b1.

*May 19, 2011*

**statistics**

The value of the correlation coeficient can be between 0 and 1.

*May 19, 2011*

**social studies**

Who had the smoothest transition from communism

*May 18, 2011*

**Chemisty**

What is the Net Ionic Equation for the following: a.) NH4Br, NaOH b.) Li2CO3, HClO4 c.)Pb(NO3)2, Kl

*May 18, 2011*

**Math**

Divide. Express your answer in simplest form. 1 3/5 , 1/4

*May 17, 2011*

**Statistics**

is this true or false? The linear correlation coefficient, r, is a numerical measure of the strength of the relationship between two variables representing quantitative data.

*May 17, 2011*

**math 117**

A launched rocket has an altitude in meters, given by the polynomial h+vt-4.9^2, h is the height in meters v is the velocity in meters per second and t is the number of seconds for which it takes the rocket to become airborne. If the rocket is launched from the top of a tower ...

*May 15, 2011*

**mitosis and meiosis**

what does mitosis mean?

*May 15, 2011*

**government**

The facts of a case a. are largely irrelevant, in that the judiciary has wide freedom with decisions. b. affect which law or laws will apply to the case. c. are important only if the case involves a statutory dispute. d. are important only if the case involves a constitutional...

*May 13, 2011*

**geometry**

What is the measure of angle DBC if the measure of angle ABD is represented by 4x, the measure of angle DBC is represented by 3x and the measure of angle ABC is 77 degrees?

*May 11, 2011*

**math**

use technology to find the P-value for a two tailed test with n=28 and a test statistic t=2.032 P-value =???? Help please! i don't understand this

*May 8, 2011*

**Physics**

If the change in position Dx is related to velocity v (with units of m/s) in the equation Dx = Av, the constant A has which dimension? a) m/s2 b) m c) s d) m2 I'm not sure how to eliminate the seconds from the velocity. Thanks in advance for any help!

*May 5, 2011*

**conseptual physics**

if you hold one end of a metal nail against a piece of ice, the end in your hand soon becomes cold. does cold flow from the ice to your and? why?

*May 3, 2011*

**math**

input/x,-2,0,2 rule/-x+3 output/y

*May 3, 2011*

**Integrated Physics and Chemistry**

Energy that is dissipated during heat flow cannot usually be used to produce work. True False

*May 3, 2011*

**Chemistry**

H2 + F2--> 2HF deltaH = 518.0 kJ H2 ----> 2H deltaH = 436.8 kJ F2 ---> 2F deltaH = 158.2 kJ (a) calculate Delta H for H + F---> HF (b) what is the standard enthalpy change of formation of F2 Help please!!! i think this is easier than i'm making it. for (b) ...

*April 28, 2011*

**science**

If the temperature at sea level were 23C,what would the air temperature be at a height of 2 kilometers under average conditions?

*April 26, 2011*