Tuesday

September 2, 2014

September 2, 2014

Total # Posts: 886

**Chemistry**

An experiment shows a 144mL sample of gas has a mass of 0.173g at a pressure of 720mmHg at a temperature of 31 degrees celsius. what is the molar mass of the sample of gas?
*March 18, 2013*

**Math**

In right triangle ABC what is the arithmetic mean (average), in degrees, of the measures of the two smallest angles? Explain how the answer is 45 degrees.
*March 11, 2013*

**algebra**

Triangles ABC and DEF are similar. Find the area of triangle ABC. Round your answer to the nearest tenth. the answer should be __________m^2 triangle abc has a 12m. triangle def has 12m and 18m.
*March 9, 2013*

**Chemistry**

How many grams of Na3PO4 are needed to produce 250mL solution that has an Na concentration of 1.04M?
*March 9, 2013*

**College Algebra**

Consider only the discriminant, b2 - 4ac, to determine whether one real-number solution, two different real-number solutions, or two different imaginary-number solutions. 2x2 = -2 -5 Thank you
*March 9, 2013*

**Math**

In the word Symmetry, which letters are symmetrical?
*March 6, 2013*

**HELP!**

Please it is important!
*March 1, 2013*

**Physics**

A space probe is carried by a rocket into outer space where it continues to move on its own in a straight line. What keeps the probe moving? Is the answer: the gravitation forces from diﬀerent stars and planets
*March 1, 2013*

**HELP!**

Please help!!!!!!!!!!!
*March 1, 2013*

**Physics**

If a Mack truck and Honda Civic have a headon collision, upon which vehicle is the impact force greater and which vehicle experiences the greater acceleration? I know they have same force.
*March 1, 2013*

**Physics**

Thanks
*March 1, 2013*

**Physics**

1)The Earth exerts an 710 N gravitational force on a man. What force does the man exert on the Earth? Answer in units of N 2)If a book is sitting on a table, the force of gravity pulls it down. Why doesn’t it fall? Is it because The table is pushing up on it with a force ...
*March 1, 2013*

**Physics**

Thanks
*March 1, 2013*

**Physics**

You hit someone with a force of 197 N. How much force is exerted on you? Answer in units of N Is the answer 197 N
*March 1, 2013*

**Physics**

You hit someone with a force of 197 N. How much force is exerted on you? Answer in units of N
*March 1, 2013*

**algebra**

Solve. x/9-1/7=26/63 STEP 1: The LCM is _________ To clear denominators, multiply each side of the equation by the LCM. _______/1 (x/9-1/7)=__________/1 multiply 26/63. STEP 2: Use the Distributive Property. _____/1 multiply x/9 - _________/1 multiply 1/7 = ______________. ...
*March 1, 2013*

**algebra**

Solve the formula for the variable given. P = r-c/n solve for c. (business) I have worked this problem so many times I'm getting confused. please help. Thanking you in advance
*March 1, 2013*

**algebra**

Triangles ABC and DEF are similar. Find the perimeter of triangle DEF. Round your answer to the nearest tenth. ab=4ft bc=6ft ac=5ft de=6ft ef= 9ft there is no feet given for df Please can anyone help me solve this with steps I don't understand how to do this. Thanking you ...
*March 1, 2013*

**algebra**

Triangles ABC and DEF are similar. Find the perimeter of triangle DEF. Round your answer to the nearest tenth.
*March 1, 2013*

**chemistry**

hemoglobin is the protein that transports O2 through the blood from the lungs to the rest of the body. in doing so, each molecule of hemoglobin combines with four molecules of O2. if 1.00 g of hemoglobin combines with 1.53 mL of O2 at 37 C and 743 torr, what is the molar mass ...
*February 20, 2013*

**chemistry**

Solid white P melts then vaporizes at high temperatures. Gaseous white P effuses at a rate that is 0.404 times that of neon in the same apparatus under the same conditions. How many atoms are in a molecule of gaseous white phosphorus?
*February 20, 2013*

**CHEMISTRY URGENT!**

for combined gas law
*February 3, 2013*

**CHEMISTRY URGENT!**

just one question how do you find the constant k???
*February 3, 2013*

**Chemistry**

how many half lives have passed if only 0.625g remain of the original 40g?
*January 28, 2013*

**math**

Thank you very much Reiny and also Damon. This is the first time I felt embarrassed helping my son. Sign of things to come of course. As Reiny suggested, we ended up plotting and then selecting less than half a dozen candidates. I also cheated and made a spreadsheet just to ...
*January 27, 2013*

**math**

sorry B=(-2,11)
*January 27, 2013*

**math**

My son has been given the collinear problem below that has be stumped two folds. 1- By trying to solve the problem using (y2-y1)/(x2-x1)=slope -- and then, find the (b) in y=mx+b for two points takes way way too long to be a 7th grade probem. My son has already been working on...
*January 27, 2013*

**Chemistry**

I got 7516.88J for ?J and mass of soln = 158.2g So my equation is 7516.88 J = 158.2g x 3.78 J/(g·°C)x(Tfinal -21.87) 12.57 = Tfinal - 21.87 Tfinal = 34.44°C Which was wrong. The hint they gave me was Start by finding the amount of heat produced when 70.0 mL of 0...
*January 24, 2013*

**Chemistry**

The neutralization of H3PO4 with KOH is exothermic. H3PO4(aq) + 3KOH(aq) -> 3H2O(l) +K3PO4(aq) +173.2KJ 70.0 mL of 0.207 M H3PO4 is mixed with 70.0 mL of 0.620 M KOH initially at 21.87 °C. Predict the final temperature of the solution if its density is 1.13 g/mL and its...
*January 24, 2013*

**Chemistry**

Can someone please help with this problem and explain it please? If soil has a density of 1.32 g/cm cubed, then what does 1.0 cubic yards of soil weigh in pounds?
*January 21, 2013*

**social science **

1) Which large European city declined significantly in population over the past century? A) Paris B) London C) Rome D) Madrid 2) The industrial city was characterized b A) decentralization B) corporate growth C) manufacturing D) commerce 3) Modern humans have existed for ...
*January 16, 2013*

**Chem**

34.5 g of O2 react with lithium metal to produce solid lithium oxide. How many grams of Li2O are produced
*January 7, 2013*

**Physics**

A rogue chipmunk has been raiding the secrete acorn stash of 3 squirrels. On discovering the perpetrator in the very act they secure him with 3 ropes and attempt to pull him off the limb where he falls to his demise. The first squirrel pulls at an angle of 12 degrees with a ...
*December 15, 2012*

**Chemistry**

Solve the following pls. Calculate the number of grams in these quantities: 1. 0.0600 mol HC2H302 2. 4.50 x10^21 molecules glucose C6H2O6
*December 14, 2012*

**Psychology**

what is the study called where the same people are tested repeatedly at different ages?
*December 5, 2012*

**math 6th grade**

what does y=x
*December 4, 2012*

**math**

A drawer contains exactly 5 red socks, 8 blue socks, 10 while socks, 12 green socks , and 7 yellow socks. Find the least number of socks to be chosen which will guarantee that there will be at least seven socks of the same color.
*November 30, 2012*

**4th Math**

can u help me find the input and output?Input numbers are 3,5,9 and output numbers are 12,15,30,33 and how u got the answers
*November 28, 2012*

**Exceptional Child**

James wants a new toy. He says, "James toy". He is using: A. short sentences B. telegraphic speech. C. baby talk. D. holophrastic speech.
*November 27, 2012*

**trig**

I don't understand what to do after i convert everything into cos and sin. Verify: cosx(tanx+cotx)=cscx
*November 25, 2012*

**chemistry**

first you must find the # of moles of NaCO3 produced: 79g NaCO3/83g(per mole of NaCO3)NaCO3 = .95 moles NaCO3 then you compare the # of moles in the equation, its a 1:1 molar ratio NaO + CO2 ==> NaCO3 (use dimensional analysis) .95 mol NaCO3| 1 mol NaO | 39g NaO ...
*November 25, 2012*

**SCIENCE 9 URGENT!!**

2. Look into the urinary system or urogenital system. (This is just a guess) You can do more research on the internet. But it can get you started.
*November 7, 2012*

**SCIENCE 9 URGENT!!**

4. The testes are outside of the body. Because sperm can only live at a specific temperature. Our body temperature is too hot for them, and they would die. That is why they have to be outside of the body.
*November 7, 2012*

**English**

Thank you I thought it might be an intensive pronoun because if removed the meaning os the sentence would be the same.
*October 21, 2012*

**English**

In this sentence: Matt began to see himself differently after he talked to Mr. Bataky. In this sentence "himself" is an object pronoun, subject pronoun, intensive pronoun, reflexive pronoun?
*October 21, 2012*

**Chemistry**

how do you balance the equation with H3PO4(aq)and BaCl2(aq)?
*October 21, 2012*

**math**

What percent of $1.00 is a nickel?
*October 17, 2012*

**math**

Thank you
*October 11, 2012*

**math**

I am not sure why you multiplied. Can you explain that. Thank you
*October 11, 2012*

**math**

If there is 1/6 of a cake and Mitchell only wants 3/12 of it, how much of the cake does he want
*October 11, 2012*

**physics**

Two objects (39.0 and 21.0 kg) are connected by a massless string that passes over a massless, frictionless pulley. The pulley hangs from the ceiling. Find (a) the acceleration of the objects and (b) the tension in the string.
*October 3, 2012*

**physics**

A student is skateboarding down a ramp that is 8.48 m long and inclined at 16.4° with respect to the horizontal. The initial speed of the skateboarder at the top of the ramp is 3.94 m/s. Neglect friction and find the speed at the bottom of the ramp.
*October 3, 2012*

**Pre Cal**

f(x) = log3(93 x + 3 815 x + 3)
*October 2, 2012*

**Home, school, Communication**

I went back and looked again. You're correct C is the right answer. thank you
*October 2, 2012*

**Home, school, Communication**

Sandwiching refers to all of the following EXCEPT: A a communication technique that is often useful. B providing less plesant news between two more plesant ideas. C litening carefully. D beginning and ending communication on positive note. I pick A
*October 2, 2012*

**Math**

Write an algebraic expression for the verbal expression: five times the sum of three and f
*October 2, 2012*

**Home, School and community**

I pick A
*October 2, 2012*

**Home, School and community**

Which of the following is NOT always true about parents who ask for special treatment? A They are trying to take advantage of a teacher. B They want the best for their child. C They require thoughtful consideration of how to provide for request. D they won't understand if ...
*October 2, 2012*

**trig**

i have to draw a flat unit circle all the way to 4 pi in radians. i can get to 2 pi but i have trouble finding the radians if i went one more time around the unit circle.
*September 28, 2012*

**Math**

How many significant figures does 22.0, 0.22, 22. , 0.022? Im just confused as to the decimal addition to numbers and what the sig figs will be for them. Thank you!!!
*September 20, 2012*

**SIG FIGS**

How many significant figures does 22.0, 0.22, 22. , 0.022? Im just confused as to the decimal addition to numbers and what the sig figs will be for them. If you dont mind can you please state some rules for sig figs that are helpful and some confusing rules as well and pretty ...
*September 20, 2012*

**biology**

What are the step by step in finding the answer for this? 4C6H1206 carbon atoms: Hydrogen atoms: Oxygen atoms: Molecules:
*September 19, 2012*

**Stats**

Problem 29. Demand for cookies (Q) is given as follows: Q = 180/Pc + I/Pd + 3 Pc = price of cookies I = income Pd = price of donuts Note: Q=28, Pc=10, Pd=7 Given the above information what is the price elasticity of demand at Q=28?
*September 18, 2012*

**adv algebra**

name the property that each equation illustrates 83+6=6+83
*September 13, 2012*

**Math**

If 2(b + 1) < -6, then a. b < -4 b. b > -4 c. b < -7/2 d. b > -7/2
*September 10, 2012*

**Math**

If 2(b + 1) < -6, then a. b -4 b. b > -4 c. b < -7/2 d. b > -7/2
*September 10, 2012*

**accounting**

Logan Products computes its predetermined overhead rate annually on the basis of direct labor-hours. At the beginning of the year, it estimated that 38,000 direct labor-hours would be required for the period’s estimated level of production. The company also estimated $...
*September 8, 2012*

**accounting**

Selected T-accounts for Rolm Company are given below for the just completed year: Raw Materials Manufacturing Overhead Bal. 1/1 31,000 Credits ? Debits 390,000 Credits ? Debits 420,000 Bal. 12/31 56,000 Work in Process Factory Wages Payable Bal. 1/1 73,000 Credits 710,000 ...
*September 8, 2012*

**accounting**

The following cost data relate to the manufacturing activities of Black Company during the just completed year: Manufacturing overhead costs: Property taxes, factory $ 3,000 Utilities, factory 4,800 Indirect labor 9,900 Depreciation, factory 23,900 Insurance, factory 5,800 ...
*September 8, 2012*

**Phy 231**

A baton consists of a nearly massless rod of length L and two spheres attached to the end of the rod, whose masses are each M and whose centers are separated by L. The spheres have radius R. If the sphere radius R is not negligible compared to the length L, what is the moment ...
*July 31, 2012*

**Phy 231**

A CD-Rom starts from rest and undergoes uniform angular acceleration until it reaches 26,000 rpm in 0.25 s. Through what angle does it rotate during this time?
*July 31, 2012*

**Phy 231**

an 18-wheeler travels down the highway with a speed of 50 km/hr. each wheel has a 30 cm radius and a mass of 16 kg. what is the total kinetic(translational and rotational) energy of all 18 wheels?
*July 31, 2012*

**Civics Moral Education**

I need help with my homework
*July 20, 2012*

**computers**

How can i tell python to stop printing something after a specific amount of time?
*July 13, 2012*

**human development**

what are the results of renee baillargeon's sliding carrot research may suggest the object permanence
*July 9, 2012*

**science**

what animals dont have a circulatory system. please answer fast thank you
*June 17, 2012*

**English Writing**

Apology letter Please help me thanks in advance? Hotel manager is writing a letter to one his customer because there is no room available for him. He came to watch football match with his family now. hotel manager put him up in the motel and paid for that. Manager is offering ...
*June 15, 2012*

**english**

The thesis statement tells the reader what the essay will be about, and what point you, the author, will be making. You know what the essay will be about. That was your topic. Now you must look at your outline or diagram and decide what point you will be making. What do the ...
*June 15, 2012*

**spelling bee**

thank you
*May 30, 2012*

**spelling bee**

how do you know when to use ous, ious, eous, or uous when spelling. im asking for in the sense of a rule or something that can help me out while im spelling. And if you have any can you please give me some other rules that my also help me out. Thank you
*May 30, 2012*

**algebra**

5x -4 = 304
*May 20, 2012*

**Algebra**

solve in (x-5) =7
*May 20, 2012*

**Chemistry**

the chemical dichlorobenzne will not disolve in water, what muct the polarity of dichlorobenznebe by and why?
*May 13, 2012*

**examinations**

i remember most of the things i'm actually pretty good in math usually with a 97+ average all the time. i'm also part of the math club in school. but i just want to know how well will i be able to do and how much time will i need to get a 95+ grade on the regents.
*May 6, 2012*

**examinations**

how long does it take to study for the algebra regents? do you think i can study for it in a month? I have taken the first 9 chapters of the barrons book and also studied for the shsat and passed but, will one month be enough for me to study and get at least a 95 and ...
*May 6, 2012*

**math**

A tree that is 100 feet tall casts a shadow that is 150 feet long. Determine the angle at which the rays of the sun hit the ground, to the nearest degree.
*April 23, 2012*

**physics please HELP !**

Which situations are examples of a particle with a non-zero acceleration? (Select all that are true for full credit.) a)A car driving around a circular track at constant speed. b)A child going back and forth on a swing c)A runner moving in a straight line with a constant speed...
*April 18, 2012*

**physics**

Which situations are examples of a particle with a non-zero acceleration? (Select all that are true for full credit.) a)A car driving around a circular track at constant speed. b)A child going back and forth on a swing c)A runner moving in a straight line with a constant speed...
*April 18, 2012*

**Science**

A weight lifter lifts a barbell from the ground, raises it at a constat velocity and holds it motionless over his head. How does the force of the lifter compare with the wieght of the barbell at different stages of the lift?
*April 11, 2012*

**algebra**

solve by addition method x +3y +z =6 3x + y – z = -2 2x +2y – z = 1
*March 30, 2012*

**physics**

A 67.5-kg basketball player jumps vertically and leaves the floor with a velocity of 1.66 m/s upward. (Take upward as positive and forward as positive.) (a) What impulse does the player experience? magnitude direction (up,down, back or zero) (b) What force does the floor exert...
*March 29, 2012*

**physics**

A 0.255-kg volleyball approaches a player horizontally with a speed of 14.2 m/s. The player strikes the ball with her fist and causes the ball to move in the opposite direction with a speed of 22.0 m/s. (a) What impulse is delivered to the ball by the player? (b) If the player...
*March 29, 2012*

**physics**

A force of magnitude Fx acting in the x-direction on a 2.50-kg particle varies in time as shown in the figure below. (a) Find the impulse of the force. (b) Find the final velocity of the particle if it is initially at rest (c) Find the final velocity of the particle if it is ...
*March 29, 2012*

**algebra**

Could someone please help me with this? Is it possible to subtract two polynomials, each of degree 3, and have the difference be a polynomial of degree 2? If so, give an example. If not, explain why not. thanks
*March 28, 2012*

**algebra**

Could someone please help me with this? (1) If x is a nonzero real number, is x–2 always positive, always negative, or positive or negative depending on whether x is positive or negative? Explain your answer.
*March 28, 2012*

**language arts**

try google.
*March 26, 2012*

**physics please help!!**

figures should help you. draw the figure of the radar gun and try solving it.
*March 26, 2012*

**Calculus**

yes ur correct.
*March 26, 2012*

**Chemistry**

How many mL of a .10 M NaOH solution are needed to neutralize 15 mL of .20 M H3PO4 solution? Write nbalanced equation: 3NaOH + H3PO4 → Na3PO4 + 3H2O 3mol NaOH recat with 1mol H3PO4 In all these titration questions, do it the simple way: Use the following equation: Ma*Va/...
*March 26, 2012*

**chemistry**

ok then no change.
*March 26, 2012*

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