Thursday

August 25, 2016
Total # Posts: 1,593

**chemistry please**

if i want to find the molarity of a solution that is: 5mL of a 3.521 x 10^-5 M solution, and filled to the 50mL line with ethanol, would this be: (3.521 x 10^-5)(.04L ethanol)?
*February 1, 2009*

**French**

How would you say 'hidden talents' in French? Would it be something like "Est-ce que tu as des talents caches?" (With the accent, I'm on a laptop and it won't let me type it"
*January 30, 2009*

**Chemistry**

Vinegar is 5% acetic acid. If the density of household vinegar is approximately 1.00 g/mL, how many grams of acetic acid are contained in 10.0 mL of vinegar? So I started out with 10.0 mL of HC2H3O2 then multiplied by 1.00g/1mL. What do I do next? Is it done there?
*January 28, 2009*

**physics**

Which is denser, ice at 0 degrees C or water at 4 degrees C? i know water is densest at 4 degrees C, but im not sure if ice is denser.
*January 11, 2009*

**Science**

During photosynthesis, plants produce something that humans need for survival. What is it?
*January 8, 2009*

**Science**

I am a large mass of frozen water. I can move rocks and boulders. I move very slowly, but i cause great changes on Earth. What am I?
*January 8, 2009*

**Chemistry/Physics**

yes but T is affected volume and pressure changes according to the ideal gas law
*January 7, 2009*

**Chemistry/Physics**

A Sample of gas is held at constant pressure in a cylinder moved by a closed piston. If the volume is halved, how will the new Vrms speed compare with the old one? a) square root of 2 times greater b) the same c) 2 times greater d) 4 times greater e) none i think its e because...
*January 7, 2009*

**social studies**

thank you
*January 7, 2009*

**social studies**

which of the following statements best describes kennedy's point of view? a.the only way that people can influence their government is by writing letters to their elected officials. b.you are not a citizen unless you vote. c.voting effects everyones future. d.government ...
*January 7, 2009*

**algebra**

Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 100 mph and train B is traveling at 110 mph. Train A passes a station at 3:10 pm. If train B passes the same station at 3:40pm, at what time will train B catch train A? 4:30 pm I am ...
*January 7, 2009*

**algebra**

Thank you sooo much!
*January 7, 2009*

**algebra**

Amy paid $62.18 for shoes during a 15% off sale. What was the regular price? $71.51 is this correct?
*January 7, 2009*

**algebra**

On 3 consecutive passes, a football team gains 5 yards, loses 28 yards, and gains 41 yards. What number represents the total net yardage? 5-28+41 18
*January 7, 2009*

**Algebra**

I am having problems figuring out some of my word problems for this week. Could someone check these? The equation y=-1777x+27,153 can be used to predict the number of gun deaths in the U. S. x years after 2000, that is, x=0 corresponds to 2000, x=2, corresponds with 2002, x=5...
*January 7, 2009*

**math**

yes so the answer would be 61 correct?
*January 7, 2009*

**science-physics**

All objects emit ______ radiation. Is it incident? The frequency of the radiation of most objects is a) below b) in the middle of c) greater than he frequency of the visibile light spectrum? I think its below as most objects can not be seen by visible light.
*January 4, 2009*

**spanish**

how do u say estoy in the yo form in the past
*December 16, 2008*

**6th grade**

I need help unscrambling these letters to form two words: inenidj tcain They go along with the phrase ______ _____and Persia.
*December 15, 2008*

**math**

A box contains 4 coins: a penny, a nickel, a dime, and a quarter. It costs a dime to reach in and take a coin. What is the expected value of this game?
*December 12, 2008*

**spelling**

grass:lawn::toss:? does anyone know the answer
*December 9, 2008*

**Science**

oh water thanks
*December 2, 2008*

**Science**

I can be three different states of matter, but not at the same time. I am necessary for life, but i can also destroy life. I can be under your feet, around your body, or over your head. What am I?
*December 2, 2008*

**French**

I had the duck story too :) We do these weekly but I like to get them checked when I do them in a hurry because I make twice as many mistakes! Merci Mme
*December 2, 2008*

**French**

Can someone check my paragraph please? Merci! It's about Thanksgiving :) Mes vacances sont passées assez ennuyeuses, alors j'ai inventé des nouvelles vacances! Le mercredi dernier, j'étais rentrée à la maison quand mes parents ont...
*December 2, 2008*

**Physics**

A uniform, spherical bowling ball of mass m and radius R is projected horizontally along the ﬂoor at an initial velocity v0 = 6.00 m/s. The ball is not rotating initially, so ω0 = 0. It picks up rotation due to (kinetic) friction as it initially slips along the &#...
*November 19, 2008*

**Math Check**

Yes thanks so much!
*November 19, 2008*

**Math Check**

is the 2nd equation 2x + 2y = 112 I don't get 4... I'm sure the 1st equation is x+y = 110 but I can't figure out the 2nd.
*November 19, 2008*

**Math Check**

Are the equations for these questions right? 1) Erik has 2 part-time summer jobs. For Job 1 he gets $9/hr on weekdays and for Job 2 he gets $12/hr for weekends. Last week he worked 23 hours and he earned a total of $231. How many hours did he work on the weekend? 9x+12y = 231 ...
*November 19, 2008*

**Math**

Kris is starting a delivery business in Ottawa called Kris' Speedy Express. He charges $5, plus $1.50/kg to deliver a package throughout all of Ottawa including all outside communities. His competition, John's Same Day Deliveries charges $6 per delivery plus $1.00/kg. ...
*November 19, 2008*

**Australian History**

Can someone please tell me the punishments onboard the first fleet to Australia?
*November 19, 2008*

**Physics please help**

Given a simple pendulum of length r and mass m, determine the oscillation period T if the perturbation angle θ is very small (i.e. θ < 10degrees). How can I derive an equation for period using just that info?
*November 17, 2008*

**Physics**

Given a simple pendulum of length r and mass m, determine the oscillation period T if the perturbation angle θ is very small (i.e. θ < 10degrees). How can I derive an equation for period using just that info?
*November 17, 2008*

**Physics**

Given a simple pendulum of length r and mass m, determine the oscillation period T if the perturbation angle θ is very small (i.e. θ < 10degrees). How can I derive an equation for period using just that info?
*November 17, 2008*

**Physics**

Are you getting 5.28 J for the total energy?
*November 14, 2008*

**Physics**

Also for position I'm getting 0.145 when I use this equation => x = -.013 sin 34.6 t + .0640 cos 34.6 t
*November 14, 2008*

**Physics**

I don't get it. I'm getting x = 0. Is that supposed to be right?
*November 14, 2008*

**Physics**

A 215 g mass attached to a horizontal spring oscillates at a frequency of 5.50 Hz. At t=0s, the mass is at x= 6.40 cm and has vx =- 45.0 cm/s. Determine: a) The Maximum acceleration to 3 significant digits. - I calculated this to be 7.64 but it keeps saying I have the wrong SD...
*November 14, 2008*

**Physics**

The two blocks in the figureoscillate on a frictionless surface with a period of 1.5s. The upper block just begins to slip when the amplitude is increased to 38cm. What is the coefficient of static friction between the two blocks?
*November 13, 2008*

**Physics**

Suppose that one oscillation of a swinging lamp takes 5.5s. What maximum speed does the lamp have if its maximum angle from vertical is 3.0degrees? I first found L to be 7.51m. That was right. Now, I calculated the angular frequency of the pendulum to be 1.14. I'm pretty ...
*November 13, 2008*

**science**

what are some key characteristics of fungi?
*November 11, 2008*

**math**

350*(6/100) = 21 350+21 = $371
*November 11, 2008*

**physics**

Use 1 of your kinematic equations twice. vfinal^2 = vinitial^2 + 2ad. First you want to find the speed of the drag racer right when the parachute opens. vfinal^2 = vinitial^2 + 2ad. Substitute 0 for vinitial^2 and take the square root of 2(17)(402). That becomes your initial ...
*November 11, 2008*

**Physics**

There is no kinetic energy unless the object is oscillating.
*November 11, 2008*

**Pre-Algebra**

what?
*November 9, 2008*

**Pre-Algebra**

In a-c, explain what would happen to a figure if you transformed it using the given rule. a. (3x, 6y) b. (x+2, y+1) c. (2x, 2y +5)
*November 9, 2008*

**Pre-Algebra**

A rectange has dimensions of 1 and 6. Another rectangle was drawn from it using a scale factor of 1.5. A. The area of the large rectangle is how many times the area of the small rectangle? B. The perimter of the large rectangle is how many times the perimeter of the small ...
*November 9, 2008*

**Physics Really Need Help Please**

I found 583 for the first one which is right. I have no idea how to do the 2nd and 3d question please help!
*November 7, 2008*

**Physics Really Need Help Please**

At time t=0 a grinding wheel has an angular velocity of 26.0 rad/s. It has a constant angular acceleration of 25.0 rad/s^2 until a circuit breaker trips at time t = 2.50 s. From then on, the wheel turns through an angle of 440 rad as it coasts to a stop at constant angular ...
*November 7, 2008*

**Physics**

I don't understand the question. What's the displacement for either of those parts? What equation should I use?
*November 7, 2008*

**Physics**

At time t=0 a grinding wheel has an angular velocity of 26.0 rad/s. It has a constant angular acceleration of 25.0 rad/s^2 until a circuit breaker trips at time t = 2.50 s. From then on, the wheel turns through an angle of 440 rad as it coasts to a stop at constant angular ...
*November 7, 2008*

**MATH**

well i think that is called the y-intercept form
*November 6, 2008*

**MATH**

How do you write an equation in standard form? Ex.How would you write this in standard form? y+1=x+2
*November 6, 2008*

**5th Grade student teacher: Needs ur help....**

What fun activity could I use to to teach 5th grade students about the Constitution?
*November 6, 2008*

**9th**

6a+4 = -8 6a = -8-4 a = -12/6 a = -2
*November 5, 2008*

**4th grade math**

The sum of two numbers times a third number is equal to the sum of each added number times the third number. For example 4 * (6 + 3) = 4*6 + 4*3.
*November 5, 2008*

**Calculus**

Use the quotient law where you find the derivative of f(x)*g(x)-the derivative of g(x)*f(x) and the whole thing divided by g(x). (x+2)(x^3+x-2)' - (x+2)'(x^3+x-2) ---------------------------------- (x^3+x-2)^2 (x+2)(3x^2+1) - 1(x^3+x-2...
*November 5, 2008*

**Damon**

Thank you so much for all the calculus help! I felt more prepared for the exam!
*November 5, 2008*

**Calc again sorry**

4) The graph of y = (x)/(1+25x^2) for x is greater than or equal to 0 has a horizontal tangent at x = what. So what I did was find the first derivative. I did the quotient rule and ended up with x50x - 1+25x^2 --------------- (1+25x^2)^2 I equated that with 0 but I don't ...
*November 5, 2008*

**Calculus**

lim(x->infinity) sqrtx sin(1/sqrtx) Someone please start me off. I don't know how to find the limits of trigonometric functions.
*November 5, 2008*

**Calculus**

How do you do this question. f(x) = (5x-1)/(2-3x), find f^(-1)(x). The answer is supposed to be (1+2x)/(5+3x). -------------------------------------- And can you please explain this one to me. Suppose that xy^(3)+2y^(2)+xy+2x^(3) = 0. Find the general expression for dy/dx. ...
*November 5, 2008*

**Calculus**

Don't you have to do implicit differentiation?
*November 5, 2008*

**Calculus - Damon**

Thanks so much!
*November 5, 2008*

**Calculus - Damon**

Find the line which passes through the point (0, 1/4) and is tangent to the curve y=x^3 at some point. So I found the derivative which is 3x^2. Let (a, a3) be the point of tangency. 3x^2 = (a3 - 1/4)/(a-0) I'm not sure how to solve for a. Yes, the point is (0,1/4) but it&#...
*November 5, 2008*

**Calculus part 3 so sorry**

y = e^2xsin3x Find the derivative. So I used the product rule and I got sin3x(e^2x)+cos^3x(e^2x). But the actual answer is sin3x(2e^2x)+cos^3x(3e^2x) Where the the 2 and 3 before the e come from?
*November 4, 2008*

**Calculus Part 2**

y = tan(sqrtx) Find dy/dx. So I found it and I got the answer as sec^2(sqrtx) but the answer is (sec^2(sqrtx))/2(sqrtx)...why? ---------------------------------- 2) Find the line which passes through the point (0, 1/4) and is tangent to the curve y=x^3 at some point. So I ...
*November 4, 2008*

**Calculus questions..really need help, please!**

1) Find the value of the lim(x->0) ((sin5x/sin2x)-(sin3x-4x)). I have no idea where to start so if someone could start it off for me it would really help. 2) If f(x) = (2x-3)/(5x+4) then what's the inverse of f(x) So I replaced x with y x = (2y-3)/(5y-3) Now am I ...
*November 4, 2008*

**Calculus**

Can someone explain the method of implicit differentiation to me. I know that we differentiation both sides of the equation with respect to x (I don't understand what they mean by with respect to x). And then y is a function of x...I don't understand what that means. ...
*November 3, 2008*

**Calculus**

Can someone explain the method of implicit differentiation to me. I know that we differentiation both sides of the equation with respect to x (I don't understand what they mean by with respect to x). And then y is a function of x...I don't understand what that means. ...
*November 3, 2008*

**Math**

22 layers
*October 27, 2008*

**Math**

Edward H. White, the first astronaut to spend 20 minutes free-floating in space, had to wear a special suit to protect him from heat, radiation, and particles. the number of layers in his suit is the number that is the only palindrome between 12 and 30. how many layers did his...
*October 27, 2008*

**Science**

are u saying that miles are bigger than km
*October 27, 2008*

**Science**

Which of these rates of speed is the fastest? 40 km/h 28 mi/h 19 knots/h I believe it is 40 km/h am I correct?
*October 27, 2008*

**Science PLEASE, PLEASE, PLEASE ANSWER DUE TOMORROW**

My body is covered with bony plates, but i am a fish. I am male, but i take care of all my young. i can swim, but i prefer to be carried by ocean currents. i look like a familiar land animal. What am i?
*October 22, 2008*

**Verb form " to be"**

How can I introduce or teach 3rd graders how to use the Correct Verb Form of the verb "to be"? I want to tell them when to use the words: am, is, are, was, and were....
*October 21, 2008*

**US history**

ok thank you,, do you know the flaws of the anti federalist views???
*October 20, 2008*

**US history**

Do you know the flaws of the federalist views
*October 20, 2008*

**US history**

Do you know the flaws of the federalist views? haha sorry...
*October 20, 2008*

**US history**

What are the flaws of the federalist views thank you guys so much!
*October 20, 2008*

**US history**

What were the key points to the Federalist viewpoint? Flaws?
*October 20, 2008*

**US history**

what/who did the antifederalists support? (what is diff. from them and the federalist beliefs)
*October 20, 2008*

**US History**

Was there anyone missing from the constitutional convention and if so who was missing from the constitutional convention? I didnt know some people were missing. Can some explain this?
*October 20, 2008*

**Biology**

What is 8 characteristics of animals?
*October 16, 2008*

**11th grade**

1. Bruce, an appliance salesman, earns a commission of $50 for each washing machine he sells and $100 for each refrigerator. Last month he earned $500 in commissions. Find all possibilities for the number of each kind of appliance he could have sold. 2. Luis has 95 cents in ...
*October 15, 2008*

**7th grade**

Maybe just comparing the differences of the elements?
*October 9, 2008*

**math problem**

on monday Sheldon brewed 1 bottle of tonic, on tuesday he brewed 4 bottles, wednesday he brewed 9 and thursday 16. How many bottles did he brew on friday? Is it 30?? I'm 10 years old thanks
*October 9, 2008*

**Math question**

Thank you very much. Sorry
*October 9, 2008*

**Math question**

I don't understand your answer?
*October 9, 2008*

**Math question**

on monday Sheldon brewed 1 bottle of tonic, on tuesday he brewed 4 bottles, wednesday he brewed 9 and thursday 16. How many bottles did he brew on friday? Is it 30?? I'm 10 years old thanks
*October 9, 2008*

**math**

on monday he brewed i bottle of tonic tuesday he brewed 4 bottles, wed he brewed 9 and thursday 16. how many bottles did he brew on friday?
*October 9, 2008*

**6th grade**

How can you make an input output division chart
*October 8, 2008*

**Math**

1808
*October 7, 2008*

**Math**

Jefferson Davis, President of the Confederate States of America, lived a square number of years. he died in 1889. The digits of the year in which he was born sum to 17. When was Jefferson Davis Born.
*October 7, 2008*

**Science**

Javier lives in an area where there is a lot of igneous rock. What is probably near by.
*October 7, 2008*

**Science**

I do not have shape or volume. You cannot see me, but i fill any container in which i am placed. I have weight, but you cannot hold me.What am I? Is it air?
*October 7, 2008*

**Math**

By how many degrees Fahrenheit do the frezzing point and the boiling point of water differ?
*October 7, 2008*

**Science**

I can live in both fresh water and salt water. When full grown, I migrate long distaces to my place of birth. What am I?
*October 7, 2008*

**PreCalculus**

Thanks! I didn't realize it could be so easy!
*October 6, 2008*

**PreCalculus**

I'm so confused... I've always been good at math but this year I'm just not getting it. But I know i can I always get help and a REAL explanation from the people on here so... A steel drum in the shape of a right circular cylinder required to have a volume of 100 ...
*October 6, 2008*

**Science**

Cells make tissue and tissue makes what?
*October 5, 2008*