Saturday

May 23, 2015

May 23, 2015

Total # Posts: 1,982

**physics **

The pressure in a fire hose is 20 atm. How high can a firefighter spray water from this hose? One atm is about 1×105 Pa. The density of water is 1.0 g/ml, or 103 kg/m3. The acceleration of gravity, g, is 9.8 m/s2.
*November 13, 2012*

**physics charges. please help!**

A charge Q = +4.5 uC is located at the origin and is fixed so that it cannot move. A small object with mass m = 2.0 g and charge q = +8.0 uC is released from rest at point A on the x-axis at x = 2.0 cm. The small object moves without friction along the x-axis under the ...
*November 12, 2012*

**world history**

identify zhongguo
*November 8, 2012*

**Physics electric force, please help!**

A charge of +Q and a charge of +2Q are separated by a distance r. The electric force of +2Q on +Q has a magnitude of F and is directed to the right. Which one of the following statements is correct regarding the electric force of +Q on +2Q? (A)The electric force of +Q on +2Q ...
*November 8, 2012*

**algebra**

6b+14=-7-b can u help me find out what b stands for in this problem.
*November 7, 2012*

**Trigonometric **

Given that sinx = 7 /25 pi/2 <or equal to x <or equal to pi Find the value of cos 2x
*November 6, 2012*

**Calculus**

A car traveling 132 feet per second decelerates at a constant rate to 60 feet per second in three seconds. A. what is the negative acceleration? B. How long after the brakes are first applied will it take to come to a complete stop? C. How far does it travel before coming to a...
*November 5, 2012*

**physics**

a vending machine ate another students dollar. the student had enough. he dropped the vending machine off a 20 m cliff. at the same time his buddy at the bottom of the cliff throws a grenade straight up towards the vending machine. the grenade strikes the vending machine after...
*November 4, 2012*

**phyicis**

a vending machine ate another students dollar. the student had enough. he dropped the vending machine off a 20 m cliff. at the same time his buddy at the bottom of the cliff throws a grenade straight up towards the vending machine. the grenade strikes the vending machine after...
*November 4, 2012*

**chemistry**

It would be higher than the true value
*November 2, 2012*

**Chemistry**

Oh ok I thought I had to divide by the molecular weight of CaCO3 to find the moles of CO3. So I take the 0.54g CO3 and divide that by 60.01g which gives me 0.009 mol CO3 in 0.009 mol CaCO3?
*November 2, 2012*

**Chemistry**

I have 0.009 moles of CaCO3 and I needed to find how many moles of CO3 are in the CaCO3. I am just making sure I am doing this correctly. 0.009 mol CaCO3 x 60.01/100.09= 0.54g CO3 0.54g CO3/ 100.09g CaCO3 = 0.005 mol CO3
*November 2, 2012*

**phyicis**

Homer Hickham and his buddies launched model rockets in the late 1950's when the US was trying to get a rocket into space. If homer launches a rocket from rest and its engine delivers a constance acceleration of 8.2 m/s^2 for 5.0seconds after which the fuel is used up by ...
*October 29, 2012*

**phyicis**

After cruising at 75 mph down I-80 for 15 minutes on a roach trip, you hit traffic and travel at 15m/s for 15 minutes for the rest of trip. your average speed is 24.26 m/s. What if you were traveling at each speed for the same distance instead of time? What would your average ...
*October 29, 2012*

**Social studies**

how does geography affect the development of a civilization?
*October 20, 2012*

**Math**

the end point of a line segment is (-3,7) and the midpoint is (1-1) find the other endpoint
*October 18, 2012*

**Physics. please help! due tomorrow!**

Let W1 represent the work required to accelerate an object on a frictionless horizontal surface from rest to a speed of v. if W2 represents the work required to accelerate the same object on the same surface from a speed of v to 2v, then which one of the following is the ...
*October 18, 2012*

**chemistry**

calculate the relativistic mass of 1.81x10^24 photons (3.00 mol) with wavelength of 450 nm.
*October 15, 2012*

**Chemistry**

I know, I don't understand. I don't know violet light or red light either, we haven't learned mass of those.
*October 15, 2012*

**math**

y=(w-5)270 for w
*October 15, 2012*

**physics**

A 5.20 package slides 1.57 down a long ramp that is inclined at 13.0 below the horizontal. The coefficient of kinetic friction between the package and the ramp is = 0.305 Calculate the work done on the package by friction. Calculate the work done on the package by gravity. ...
*October 5, 2012*

**physics**

A 5.20 package slides 1.57 down a long ramp that is inclined at 13.0 below the horizontal. The coefficient of kinetic friction between the package and the ramp is = 0.305 Calculate the work done on the package by friction. Calculate the work done on the package by gravity. ...
*October 4, 2012*

**Precalc**

how do I graph this function? x^2-xy+2x-1=0
*October 4, 2012*

**science**

On Earth, the ratio of the force (newtons) to the mass (kilograms) of an object is always the same
*October 4, 2012*

**definition**

CORRECT!!!! Somehow... i never thought of that word!!! thank u!
*September 29, 2012*

**definition**

what is a word that you don't choose when making a choice?
*September 29, 2012*

**Earth Science**

Does energy flows through the Earth's system by heat?
*September 28, 2012*

**Earth Science**

Can someone five me an example of how carbon cycles through the Earth's system?
*September 28, 2012*

**Math - LCD**

What is the LCD for x^2,x, and x?
*September 27, 2012*

**math **

is it true that you only have to check your solution in a rational equation if the solution is 0?
*September 27, 2012*

**Algebra**

All i know is the answer is 122.2%, i don't know what kind of problem this is or how to solve it haha
*September 24, 2012*

**AP Chemistry**

For the reaction ? Al + ? CuSO4 ↽⇀? Al2(SO4)3+? Cu a maximum of how many moles of Al2(SO4)3 could be formed from 5.95 mol of Al and 1.31 mol of CuSO4? Answer in units of mol.
*September 19, 2012*

**AP Chemistry**

For the reaction ? C6H6 + ? O2 ↽⇀? CO2 + ? H2O a maximum of ? moles of CO2 could be formed from 9 mol of C6H6 and 2.81 mol of O2. Answer in units of mol
*September 19, 2012*

**AP Chemistry**

So is it 1655.84?
*September 19, 2012*

**AP Chemistry**

What volume of 3.16 M HNO3 is required to prepare 524 mL of a 0.2 M HNO3 solution? Answer in units of mL.
*September 19, 2012*

**AP Chemistry**

How many grams of sucrose (C12H22O11) must be dissolved in 60 g water to make a solution in which the mole fraction of sucrose is 0.4? Answer in units of g.
*September 19, 2012*

**physics**

A ping pong ball is rolling across a table top at 22 m/s. If it is 71 m away from the edge, how much acceleration does a person blowing on it need to apply to stop it from falling if they blow for 8.7 seconds?
*September 17, 2012*

**physics**

A ping pong ball is rolling across a table top at 22 m/s. If it is 71 m away from the edge, how much acceleration does a person blowing on it need to apply to stop it from falling if they blow for 8.7 seconds?
*September 17, 2012*

**Math**

What is the smallest number with digits to the thousandths place that will round to 34.6?
*September 17, 2012*

**Stats**

Suppose X & Y are two independent stocks' returns with: E(X) = E(Y) =15% and V(X) = 144, V(Y) = 256 Problem 1. Buy half X and half Y, so w1 = w2 = 0.5 and Z = (X+Y)/2 Note: The answer says that the variance is 100 but I thought it would be 200. Since I would be adding half...
*September 14, 2012*

**science**

what is the density of liquid in a baloon that weighs 20N on a spring scale if the baloon has a volume of 0.75L what is the liquid density g/ml
*September 13, 2012*

**Physics**

Two 125 N forces pull on a 50 kg mass. One of the forces pulls to the right and the other pulls 90 degrees from the first force. What is the net acceleration of the mass?
*September 12, 2012*

**Chemistry**

oh I'm sorry it's a typo The question is this: Calculate the molality of a 0.410 molar aqueous glucose solution whose density is 1.15 g/mol
*September 12, 2012*

**Chemistry**

Calculate the molality of of a sol'n whose density is 1.15 g/ml
*September 12, 2012*

**Algebra**

48m^6
*September 12, 2012*

**science**

bromine and mercury are the only 2 liquids on the periodic table, could you predict this? why or why not?
*September 10, 2012*

**econ**

Suppose there are 1000 identical firms producing diamonds. Diamond miners receive the wage rate w. Assume that the short-run cost function for each diamond-producing firm is C(q) = wq + q2. a. If w = 10, what is the supply curve of an individual firm? What is the market supply...
*September 5, 2012*

**Math**

I am stuck with this logic problem: Logic – Jack of All Trades Trudy loves learning new things and is always taking some course or other forum the local college’s adult education program. She’s signed up for four upcoming classes – calligraphy, picture ...
*August 29, 2012*

**Math**

I am stuck with this logic problem: Logic – Jack of All Trades Trudy loves learning new things and is always taking some course or other forum the local college’s adult education program. She’s signed up for four upcoming classes – calligraphy, picture ...
*August 28, 2012*

**Labor business**

Why?
*August 13, 2012*

**Labor business**

Should only those who are trained lawyers allowed to be arbitrators for labor disputes?
*August 13, 2012*

**math**

339.97 x 48= 16318.56 16318.56+ 3260= 19578.56
*August 13, 2012*

**Computer**

How can I find information to develop an Excel spreadsheet using conclusions from my research about mulimedia tools that aid classroom instruction?
*June 24, 2012*

**physics **

Two identical diverging lenses are separated by 15 cm. The focal length of each lens is -8.0 cm. An object is located 4.0 cm to the left of the lens that is on the left. Determine the final image distance relative to the lens on the right.
*May 30, 2012*

**geometry**

determine the values of x and y for which ABCD is a parallelogram. AB = 3x + 7, BC = y +8, CD = 5x + 1, DA = 2y - 3
*May 29, 2012*

**geometry**

classify a triangle with side lengths 5, 9 and 12 as acute, right, or obtuse
*May 29, 2012*

**geometry**

ABCD is a trapezoid with median EF and bases AB and CD. AB = 18, EF = 28. Find CD
*May 29, 2012*

**math**

what is the inverse of: f(x) = 2(x – 4)^2 + 5
*May 28, 2012*

**Math**

This is how the question looks on the sheet?
*May 27, 2012*

**Math**

A rabbit population satisfies the logistic equation dy dt = 2x10^-7y(10^6- y); where t is the time measured in months. The population is suddenly reduced to 40% of its steady state size by myxamatosis. If the myxamatosis then has no further effeect, how large is the population...
*May 27, 2012*

**Problem Solving**

A 4oz jar of spice costs 92 cents. What is the unit cost per ounce.
*May 23, 2012*

**writting out clock time**

How do I write 1 minute 45.9 seconds? Is it 1:45.9 or is that one hour 45.9 seconds?
*May 22, 2012*

**math**

Records from buzz's sawmill show that workers have a 0.02 probability of losing an arm and a 0.03 probability of losing a leg in a year. What is the probability that a worker does not lose an arm? What is the probability that worker does not lose and arm or leg?
*May 18, 2012*

**math**

What is the number of ways 9 people from a group of 13 could be arranged in a line.
*May 17, 2012*

**MATH**

The probability that a voting-age adult in 2004 voted in the presidential election was 0.57. Five voting-age adults in 2004 were randomly selected. Find the probability that exactly 2 or the 5 adults voted in the presidential election.
*May 13, 2012*

**statistics**

11 are from Atlantis and 5 are from Zedonia
*May 12, 2012*

**statistics**

A group meeting is attended by 16 delegates. (a)If a 6-person negotiation panel is selected at random from the 16 delegates, what is the probability the negotiation panel consists of 3 delegates from Atlantis and 3 delegates from Zedonia?
*May 12, 2012*

**physics**

i am also stumped on this question The bounce periods y are measured for a set of masses x hung from a spring. Assuming the exponential form y = bx m, (log y) vs. (log x) is plotted, yielding a linear trendline equation of (log y) = 0.4796 (log x) + 0.1029, with R2 = 0.9991. ...
*May 12, 2012*

**physics**

A 2630-kg car drives up a hill 769 meters high in 41.0 seconds. Calculate the power exerted
*May 12, 2012*

**bio**

what do macrophages have to do with coplement proteins
*May 10, 2012*

**english**

so adverb?
*May 10, 2012*

**english**

(forth) is italicized
*May 10, 2012*

**english**

thank you and i have something different now: What part of speech is the italicized word in the sentence below? Four score and seven years ago, our forefathers brought forth upon this continent a new nation conceived in liberty and dedicated to the proposition that all men are...
*May 10, 2012*

**english**

so its complex??
*May 10, 2012*

**english**

please help
*May 10, 2012*

**english**

is this a compound or complex sentence: They were lovely people, the kind you might meet anywhere.
*May 10, 2012*

**Statistics**

A large furniture store has begun a new ad campaign on local television. Before the campaign, the long term average daily sales were $24,819. A random sample of 40 days during the new ad campaign gave a sample mean daily sale of x(bar)=$25,910 with sample standard deviation s...
*May 9, 2012*

**english**

its adjective clause?
*May 8, 2012*

**english**

i have one more :The hero falls in love with a countess (who is very beautiful).
*May 8, 2012*

**english**

its past participial phrase
*May 8, 2012*

**english**

i think it could be: Headed by a senior,
*May 8, 2012*

**english**

so it would be nominative absolute??
*May 8, 2012*

**english**

senior
*May 8, 2012*

**english**

or prepositional phrase with a gerund
*May 8, 2012*

**english**

thank you and what about this one:Headed by a senior, the group drew up rules for School Spirit Week. i think its nominative absolute??
*May 8, 2012*

**english**

please help me!!!! Put the sizes on the uniforms while sorting them out. and the italicized is sorting them out,can only be: adverb clause infinitive phrase past participial phrase elliptical clause adjective clause
*May 8, 2012*

**english**

please help me
*May 8, 2012*

**chemistry **

The half life of phosphorus -32 is 14.3 days. What percentage of an original samples radioactivity remains after 57.2 days?
*May 7, 2012*

**biology**

What reactions go on in your brain when you fall asleep? If you could give me a website that goes INDEPTH as to what happens in the brain when you fall asleep that would be great!
*May 7, 2012*

**statistics**

The international olympic committe states that the female participation in the 2004 summer olympic games was 42%, even with new sports such as weight lifting, hammer throw, and modern pentathalon being added to the games. Broadcasting and clothing companies want to change ...
*May 4, 2012*

**math**

For the geometric series 50+48+... a. 867.373 is the approximate value of a partial sum of the series. How many terms were added to get this number? b. To what number does the serveries converge?
*May 3, 2012*

**APUSH PLZ HELP!**

In 1850 the South was in good political shape. Each of the following descriptions explains why that was true except? A. Zachary Taylor, the president, was a southern slave-owner B. The majority of the presidential cabinet were southerners C. Most of the justices on the US ...
*May 2, 2012*

**APUSH**

In 1850 the South was in good political shape. Each of the following descriptions explains why that was true except? A. Zachary Taylor, the president, was a southern slave-owner B. The majority of the presidential cabinet were southerners C. Most of the justices on the US ...
*May 2, 2012*

**science**

How do you think objects will fall when there is no air
*May 2, 2012*

**Math Word problems (3rd Grade)**

A 4oz jar of spice costs 92 cents. What is the unit cost per ounce?
*April 30, 2012*

**bio**

how is the thalamus the sensor regulator for the brain (what are the steps that happen when it receives a stimuli?
*April 30, 2012*

**biology**

how does the REM help create a sleep signal sent from the pons in the brain that helps to stop motor neurons in the spine when a person sleeps. Please help me! I am looking for detailed information right down to the certain proteins and such! I have searched everywhere and ...
*April 29, 2012*

**Music**

I need to make an instrument for my music class. does anyone have any good ideas? we will have a week to make it. It cant be something that involves using power tools. Any ideas? and if so do you have a website on how to make it? I wanted to try to make an accordian like out ...
*April 26, 2012*

**math**

using three dimensional objects. trace one face of a cone. trace one face of a pyramid.
*April 24, 2012*

**algebra**

Mr.dorkus lost five test papers.he found a summary of the missing scores which said that the mode of the scores was 90 the meadian was 85 and the mean was 83.The grades were whole numbers bettween 0 and 100. what is the lowest possible score of the missing test
*April 23, 2012*