Wednesday

August 24, 2016
Total # Posts: 2,109

**Chemistry**

An unknown amount of gas occupies 30.0 L at 2.1 ATM and 298K. How many moles does the sample contain? What is the mass if the gas is helium? What is the mass if the gas is argon?
*April 10, 2013*

**Chemistry**

what volume does 3.01x 10^21 molecules of N2 occupy at STP
*April 10, 2013*

**English (Check Please)**

1. urgency. 2. the life of city dwellers 3. his awe at the starry sky above the camp
*April 8, 2013*

**math**

Multiply both sides by 1/2 (1/2)(2y) = (1/2)(4/3) y = 4/6 y = 2/3
*April 6, 2013*

**algebra**

I think this problem is really (3x - 2) / 3x = 4 / 3 [cross multiply] 3(3x - 2) = 4 * 3x 9x - 6 = 12x 9x -6 + 6 = 12x +'6 9x = 12x + 6 9x - 12x = 12x + 6 - 12x -3x = 6 x = -2
*April 6, 2013*

**grade 6 honors math**

Thanks. Saiko
*April 5, 2013*

**grade 6 honors math**

Of 150 sixth graders choosing electives for next year, 50 signed up for theater, 65 signed up for art and 70 signed up for band. Some students did not choose an elective. Represent this information using Venn Diagrams.
*April 5, 2013*

**math**

The question does not make sense. Did you copy it correctly?
*April 5, 2013*

**Algaebra**

First, draw a picture to represent the pool with walk around it. Let x = width of pool, then x + 5 = length of pool x+ 9 = length of walk, and x+4 = width of walk Area of pool = x(x +5) Area of walk and pool =(x + 9)(x + 4) Area of pool + 156 = Area of walk and pool x(x + 5...
*April 5, 2013*

**calc**

find the limit:x->3 ln(x/3)/x^2-9
*March 31, 2013*

**Math-Population Word Problem**

Ohh my gosh, thank you. I was just confused about "a" but the extra information cant hurt. Thank you so much.
*March 26, 2013*

**Math-Population Word Problem**

thank you very much, it all makes sense now except for a. could you explain how you get that number. I plugged it into a calculator and it is correct but i just don't understand how it works.
*March 26, 2013*

**Math-Population Word Problem**

The population of rabbits in a national forest is modeled by the formula P=8,600+650 ln(t+1) where "t" is the number of years from the present. a)How many rabbits are now in the forest b)Estimate when it will take for the number of rabbits to reach 12,000? c)Estimate...
*March 26, 2013*

**Writing**

I rock
*March 20, 2013*

**English**

In which sentence is the underlined word a past participle? Melted rock can explode or flow from different types of volcanoes. Having been warned of a possible eruption, the people left their town at the base of the volcano. Flowing lava from a volcano is an amazing sight to ...
*March 20, 2013*

**physical science**

A 150-L water heater is rated at 8 kW .If 20 percent of its heat escapes, how long does the heater take to raise the temperature of 150 L of water from 10C to 60C?
*March 16, 2013*

**Chem**

When 20.0 g C2H6 and 60.0 g O2 react to form CO2 and H2O, how many grams of water are formed?
*March 14, 2013*

**Social Studies**

fddrdedededed
*March 7, 2013*

**Calculus**

An ocean oil well is leaking oil into the ocean at a rate of 1 m3/hr resulting in an oil slick in the form of a circular disk (like a quarter or dime). If the slick remains in the shape of a disk with a constant thickness of 1/100 m as the disk expands, determine the rate at ...
*March 6, 2013*

**Calculus**

An ocean oil well is leaking oil into the ocean at a rate of 1 m3/hr resulting in an oil slick in the form of a circular disk (like a quarter or dime). If the slick remains in the shape of a disk with a constant thickness of 1/100 m as the disk expands, determine the rate at ...
*March 6, 2013*

**Calculus**

An ocean oil well is leaking oil into the ocean at a rate of 1 m3/hr resulting in an oil slick in the form of a circular disk (like a quarter or dime). If the slick remains in the shape of a disk with a constant thickness of 1/100 m as the disk expands, determine the rate at ...
*March 6, 2013*

**4th grade Algebra**

Hi
*March 6, 2013*

**math**

what is 21/2 x 1/2
*March 4, 2013*

**physical**

A 70-kg man and a 50-kg woman are in a 60-kg boat when its motor fails. The man dives into the water with a horizontal speed of 3m/s in order to swim ashore. If he changes his mind, can he swim back to the boat if his swimming speed is 1m/s? If not, can the woman change the ...
*March 2, 2013*

**physical**

When 1 g of gasoline is burned in an engine, about 48 kJ of heat is produced. How much mass is lost in the process? Do you think this mass change could directly measured
*March 2, 2013*

**Science**

If there was zero change in Earth’s eccentricity, how might that affect the possibility of an ice age?
*March 1, 2013*

**physics**

. A 70-kg man and a 50-kg woman are in a 60-kg boat when its motor fails. The man dives into the water with a horizontal speed of 3m/s in order to swim ashore. If he changes his mind, can he swim back to the boat if his swimming speed is 1m/s? If not, can the woman change the ...
*February 28, 2013*

**physics**

I used the equations of motion for constant acceleration (The object is assumed to fall with the acceleration due to gravity which I took to be 10 m/s^2) Equations of motion: V^2=U^2 + 2*a*s V=U+at Note: when objects rebounds, acceleration = - 10m/s^2 since the latter is a ...
*February 25, 2013*

**physics**

I worked it out and got 4.8N
*February 25, 2013*

**science**

The acceleration of gravity on the surface of Venus is 8.9m/s^2. Would a ball thrown upward on Venus return to the ground sooner or later than a ball thrown upward with the same speed on the earth?
*February 22, 2013*

**science**

A force of 20 N gives an object an acceleration of 5m/s^2. (a) What force would be needed to give the same object an acceleration of 1m/s^2? (b) What force be needed to give it an acceleration of 10m/s^2?
*February 22, 2013*

**math**

0.5, 3/5, 1 3/4, 0.9 in order from least to greatest
*February 21, 2013*

**chemistry**

How do you find q in q=mC delta t without the mass
*February 21, 2013*

**trigometry**

1. A 16-foot ladder on ground level is leaning against a house. If the base of the ladder is placed 5.0 feet from the house, what is the angle formed at the top of the ladder? A. 24° B. 18° C. 72° D. 20° please help I don't know how to do this
*February 20, 2013*

**Calculus**

calculate the derivative (2,5) (2.1,5.3) h'(2) if h(x)=(f(x))^3 k'(2) if k(x)=f(x))^-1 g'(5) if g(x)=f^-1(x)
*February 18, 2013*

**Physics 11**

0.5m
*February 10, 2013*

**Physics 11**

0.5
*February 10, 2013*

**Physics**

You run a race with your friend. At first you each have the same kinetic energy, but then you find that she is beating you. When you increase your speed by 21.0%, you are running at the same speed she is. If your mass is 77.0 kg, what is her mass?
*February 10, 2013*

**SS**

your mom
*February 7, 2013*

**calc**

agree thank you steve
*February 5, 2013*

**calc**

find the derivatives of the given functions. g(t)=sqrt t(1+t)/t^2
*February 5, 2013*

**Math PLEASE HELP FAST!!!!**

c
*January 30, 2013*

**history**

ms.sue,thank you for the answer, but i have to discribe the things Juan Ponce De Leon discovered in his journey to the new land! My homework question is, discribe the things he discovered in his journey to the new world like plants,animals,people and land???
*January 29, 2013*

**history**

what did Juan Ponce De Leon discover in his journey to the new world: plants,animals,people,land?
*January 29, 2013*

**math**

If a hiker walks trail B (1 mile in length) at 6 mph and trail C (3 mils in length) at 2 mph, what is the hiker's overall average speed, in mph, for hiking on the two trails?
*January 28, 2013*

**Math on time**

thank
*January 27, 2013*

**Math on time**

Trying to understand how to solve this? Paige spends 1 hour on her homework. She spends equal amounts of time on all subjects. If Paige spends ½ hour on Spanish, how many subjects does she study?
*January 27, 2013*

**Math**

The area of certain rectangle is 288 yd. the perimeter is 68 yd. if you double the length and width, what will be the area and perimeter of the new rectangle.
*January 23, 2013*

**Math**

A plane leaves Boston at 10 am (Boston time) and flies non-stop to LA, 2700 miles away, at 580 miles per hour (mph). On the same route, a second plane is flying non-stop from LA to Boston at 620 mph. If the second plane lease LA at 10 am (LA time), how many miles from LA will ...
*January 22, 2013*

**English/Essay**

Could someone tell me if I have done my essay the right way? Please its due Monday?? "The internet is a much easier resource for students than a library” The first reason the internet is a much easier resource for students than a library, you can Find specific ...
*January 12, 2013*

**9th grade algebra**

25.4
*January 10, 2013*

**math**

(+6) + (-11) + (+5) + (-7)
*January 10, 2013*

**Pie Charts**

On the pie chart it reads: 1999 U.S. Electricity Generation by Fuel Type (Billion Kilowat hours) Coal: 1882, 51% Natural Gas:565 15.3% Petroleum: 119, 3.2% Nuclear: 728, 19.7% Hydroelectric: 307, 8.3% Other Renewables: 89, 2.5% What was the total amount of electricity ...
*December 13, 2012*

**8th grade math **

Jerome, Kevin, & Seth shared a submarine sandwich. Jerome ate 1/2 of the sandwich, Kevin ate 1/3 of the sandwich and Seth ate the rest. What is the ration of Jerome's share to Kevin's share to Seth's share? 1. 2:3:6 2. 2:6:3 3.3:1:2 4.3:2:1 5.6:3:2 please help!
*December 7, 2012*

**Social Studies**

I don't have an atlas and I need help finding the location. I need the nearest city and the country that it's in. Thank you. 1. 31° s, 64° w 2. 13° s,71° w 3. 16° s, 68° w
*December 6, 2012*

**algebra**

matching graphs inequailty
*December 6, 2012*

**Physics**

16) A curve of radius 120 m is banked at an angle of 18°. At what speed can it be negotiated under icy conditions where friction is negligible? 2 m/s 12 m /s 20 m /s 5 m/s 11 m/s
*December 6, 2012*

**algebra2**

how do you find out the vertex when graphing inequalities of quadratics in equations like this y<x^2-16 it factors out to like x+4 x-4 and I know that i can use that to find the x intercepts but the way to find the vertex i dont understand
*December 4, 2012*

**english**

another word for nothing more than? For example, if you say that advice is nothing more than
*December 2, 2012*

**algebra 2**

sorry i needed to add more info for this to make sense the problem is asking to write the quadratic equation that has those roots. so in this case i'd use those roots to find -b/a but i dont get how that correlates to -b/a?
*December 2, 2012*

**algebra 2**

how is 7-3i + 7+3i = 14/1 we're doing sum and product of roots, and i dont get how this is equal to 14
*December 2, 2012*

**Algebra**

Each team in a soccer leaguehas played every other team 5 times. Current league standings are: Team A 37 Points Team B 34 Points Team C 28 Points Team D 26 Points Team E 20 Points If a team receives 3 points for a win, 1 point for a tie, and 0 points for a loss, how many of ...
*November 29, 2012*

**Chemistry**

What is the molality of a solution formed by dissolving 1.95 mol of KCl in 17.0 mol of water (MM of water = 18.02 g/mol), answer in 3 sigfigs?
*November 26, 2012*

**math**

4x/5-x=x/15-20/3=
*November 21, 2012*

**Physics**

A uniform rod of length L and mass m initially at rest is struck by a horizontal force F0 a distance x below the pivot O. The rod is free to rotate about its pivot without friction. If F0 is the average value of the force and Δt is its duration. (a) What is the speed of ...
*November 17, 2012*

**Science **

How much force was used to move a box 42m if 13,734 J of work was done on it?
*November 16, 2012*

**physics**

What is the angular momentum of a figure skater spinning at 4.4 with arms in close to her body, assuming her to be a uniform cylinder with a height of 1.6 , a radius of 15 , and a mass of 53 ?
*November 11, 2012*

**Physics **

A class of 11 students taking an exam has a power output per student of 122 W. Assume that the initial temperature of the room is 18.8oC and that its dimensions are 6.40 m by 14.5 m by 3.50 m. What is the temperature (in oC, do not enter units) of the room at the end of 54.0 ...
*November 11, 2012*

**Physics!**

If a water heater has a capacity of 54.4 gallons and a 4910 W heating element, how much time is required to raise the temperature of the water from 19.8oC to 60.0oC? Assume that the heater is well insulated and no water is withdrawn from the tank during this time.
*November 11, 2012*

**Physics**

Sorry, rotational inertia I = 6.4 * 10^-3 kg*m^2. I really am stuck on this, can't figure out how to use angular momentum/torque relations to connect the dots and be able to solve for what they're asking ;\.
*November 9, 2012*

**Physics**

A gyroscope with rotational inertia 6.4 10-3 kg·m2 is precessing in a horizontal plane at 0.46 rad/s under the influence of a 0.31 N·m torque caused by a force pointing vertically downward. How fast is the gyroscope spinning on its axis?
*November 9, 2012*

**chemistry**

I don't think this makes sense... there are not any oxygens on the left so Im pretty sure it doesn't work, unless you just add oxygen to the left im not sure you can do that though... If so it would look like this KNO3 --> KNO3 + O ^add O to this side as well Once ...
*November 8, 2012*

**arrays and expanded algorithm**

23×17
*November 6, 2012*

**chemistry**

Fe(s) +Pb^2 (aq)---->Fe ^2+ (aq) +Pb(s) which reactant has been oxidized
*November 4, 2012*

**English 8R - Homework Check (plzzzz read)**

Very obvious you have copied... we have all done it before... just put it in your own words (especially in the beginning)
*November 4, 2012*

**Science**

wuz up
*November 2, 2012*

**Calculus**

A rectangular cardboard poser is to have 150 sq ft in for printed matter. It is to have a 3inch margin at the top and bottom and a 2inch margin at the right and left. Find the dimensions of the poser so that the amount of cardboard used is minimized.
*October 29, 2012*

**math**

explain why the equation x^(5)-3x+1=0 must have a solution with 0 < x <1
*October 29, 2012*

**Chemistry**

Determine how many mL of solution A (acetic acid-indicator solution) must be added to solution B (sodium acetate-indicator solution) to obtain a buffer solution that is equimolar in acetate and acetic acid. Solution A: 10.0 mL 3.0e-4M bromescol green solution 25.0mL 1.60M ...
*October 29, 2012*

**Physics**

because b and m_o are constants and i believe that e^-kt is taken as a constand as well. Leaving dx to be integrated between 0 and x(t). am i correct? more opinions welcomed please
*October 25, 2012*

**Physics**

I think that the answer comes out to be v(t)=(uk-g)t - b*m_o*(e^-kt)*x(t)
*October 25, 2012*

**Physics**

A rocket ascends from rest in a uniform gravitational field by ejecting exhaust with constant speed u. Assume that the rate at which mass is expelled is given by dm/dt=mk, where m is the instantaneous mass of the rocket and k is a cosntant, and that the rocket is retarded by ...
*October 25, 2012*

**BC Calculus**

Use linear approximation to estimate sec^2(pi/4 + .025) Need help quickly please!! :)
*October 24, 2012*

**Physics**

7.74s
*October 23, 2012*

**math**

Samuel solved the equation h – 234 = 1,192 and found the solution to be h = 958. Is he correct? He is right I think because when you subtract 234 from 1192 it equals 958 right?
*October 23, 2012*

**Calculus**

simplify log2(4x^2 2^x)
*October 22, 2012*

**math**

In an election, Kate lost to Lee by 32 votes. Because the vote was so close, they decided to have a re-vote. All of Kate's supporters voted fro her again, but some of Lee's supporters switched their votes to vote for Kate. Kate won by the revote by 6 votes. How may of ...
*October 21, 2012*

**math**

What is the distance between the rectangular coordinates (1,16) and (10,4)?
*October 21, 2012*

**goverment **

in the recent presidential election, romney's comment "binders full of woman" really offended people. why were people so offended, i dont really understand, did he mean something bad?
*October 21, 2012*

**calculus **

Write h(x) = 6x^4 - 2x^2 + 1 as a composition of two functions f and g
*October 20, 2012*

**Literature**

13. Scan this line from Cowley's poem: "its hills bent low within my reach." How many feet does this line contain? A. 5 B. 7 C. 6 [D. 4]
*October 15, 2012*

**Literature**

c is the correct answer finished the tesr
*October 15, 2012*

**Literature**

5. As we find with most songs, in poetry [A. there's no specific point of view.] B. each couplet must rhyme. C. sound and content have equal weight. D. meanings are hidden in imprecise words.
*October 15, 2012*

**Literature**

2. In The Call of the Wild, the bond between Buck and Thornton is best explained by observing that A. dog and man were like mirror opposites. [B. dog and man were both in touch with their primordial nature.] C. Buck had helped Thornton pay off his debts. D. Buck found Thornton...
*October 15, 2012*

**chemistry**

what fraction of an original sample of a radioactive isotope remains after three half-lives have passed? 1/8?
*October 13, 2012*

**Statistics **

A 50-question true-false exam is given. Each correct answer is worth 10 points. Consider an unprepared student who randomly guesses on each question. In your solution, please be sure to show the exact steps you used to arrive at the answers. A. If 5 points are deducted for ...
*October 10, 2012*

**Calculus**

thank you
*October 9, 2012*

**Calculus**

Find the derivatives of the function f(y)= sinh(sinh(7y).
*October 9, 2012*

**chemistry**

52.9kj/mole
*October 9, 2012*

**math**

A candle is 17 in. tall after burning for 3 hours. After 5 hours, it is 15 in. tall. Write a linear equation to model the relationship between height h of the candle and time t. Predict how tall the candle will be after burning 8 hours.
*October 9, 2012*