Saturday

November 28, 2015
Total # Posts: 973

**Chemistry. Please help!!**

Calculate the final temperature when a 18.7 gram sample of ice at 0 degrees C is placed into a styrofoam cup containing 113 grams of water at 71.6 degrees C. Assume that there is no loss or gain of heat from the surroundings. Heat of fusion of ice = 333 Jg^-1 Specific heat of ...
*March 2, 2012*

**Chemistry. Please help!**

it's ok. i figured out the last ones. thanks so much!!
*February 28, 2012*

**Chemistry. Please help!**

For the problems below, I have the answers written but from questions d-i, I don't understand how they got the answer. I tried doing it and somehow I messed up with the formula with 3/2 and 5/2 so please show work on how they got the answers for d-i. In answering this set ...
*February 28, 2012*

**math**

THANK YOU VERY MUCH I REALLY APPRECIATE THE HELP MS.SUE
*February 27, 2012*

**math**

If there are 32 students and 5/8 walk to school . How many walk to school. HOw is this problem worked out
*February 27, 2012*

**calculus. please helppp!!**

that worked. thank u so much!!
*February 22, 2012*

**calculus. please helppp!!**

is there a way to use difference quotients for it?
*February 22, 2012*

**calculus. please helppp!!**

urghh it says thats not right!
*February 22, 2012*

**calculus. please helppp!!**

the values changed. now its table is: (0, 14) (2, 38) (4, 60), (6, 77) (8, 93) (10, 104) so i said the first derivative is positive, second is negative. f^' (2) ---> between x=0 and x=2, it's 12 between x = 2 and x = 4, it's 11 average = 11.5 f^' (8) ---->...
*February 22, 2012*

**calculus. please helppp!!**

its says the answers are wrong. doesn't specify which one. so I'm not sure if the actual answer is wrong or if its the negative sign.
*February 22, 2012*

**calculus. please helppp!!**

i tried the for x = 2, -12.25 and for x =8, -8.5 and the website says it's wrong. it doesn't say which one is wrong. should the values be negative or positive?
*February 22, 2012*

**calculus. please helppp!!**

for x = 8 do u use between x =6 and x=8 and between x=8 and x=10?
*February 22, 2012*

**calculus. please helppp!!**

so then for x = 8, u do the exact same steps by dividing the numbers by 2?
*February 22, 2012*

**calculus. please helppp!!**

yeah for 2 but when I tried that for x = 8, I have a huge gap between the two numbers for 8. I got between x=0 and x =8, it is -88. then dividing that by 8, i got -11. then when i did between x= 8 and x =10, i got -55. then dividing that by 8, i got -1.875 and now I'm stuck
*February 22, 2012*

**calculus. please helppp!!**

1.) values of f(t) are given in the following table: t 0 2 4 6 8 10 f(t) 137 112 88 68 49 34 Estimate (f prime) f^' (2) and f^' (8) Please show work so I can understand. I'm really stuck. if the table comes out messed up, the values are: (0, 137) (2, 112) (4, 88) (...
*February 22, 2012*

**calculus**

I'm getting confused on x= 8 would you do between x=0 and x= 8, the change is -88 and then divide that by 8 = -11 between x= 8 and x= 10, y changes -15 and then divide that by 8 to get -1.875 but then what?
*February 22, 2012*

**calculus**

oh ok. but wut about f^'(2). how do i find that from the table?
*February 22, 2012*

**calculus**

i just saw the table is messed up so the values are: (0, 137) (2, 112) (4, 88) (6, 68) (8, 49) (10, 34)
*February 22, 2012*

**calculus**

1.) values of f(t) are given in the following table: t 0 2 4 6 8 10 f(t) 137 112 88 68 49 34 a. Does this function appear to have a positive or negative first derivative? Second derivative? * I think both derivatives are negative b. Estimate (f prime) f^' (2) and f^' (...
*February 22, 2012*

**Science**

How many grams of oxygen are collected in a reaction where 230. mL of oxygen gas is collected over water at a temperature of 25°C and a total pressure of 697 torr?
*February 16, 2012*

**language**

Thank u sooo much :-).
*February 7, 2012*

**language**

1. (Glue, plural) 2. (place, plural)
*February 7, 2012*

**language**

Underline the present-tense verb. Tell whether it is singular or plural. 1. A craftsperson uses small shells or pieces of large shells. (uses ,singular) 2. most people glue the shells into the frame. (frame, plural) 3. Then they place it on a flat surface. (surface, plural). 4...
*February 7, 2012*

**language**

Please let me know if I'm right Shaped, past.
*February 7, 2012*

**language**

2. Shaped, past.
*February 7, 2012*

**language**

Rolls, present
*February 7, 2012*

**language**

Rolls, past
*February 7, 2012*

**language**

(Rolls, past)
*February 7, 2012*

**language**

Write the verb in each sentence. Write whether the action is past, present, or future 1. A Potter adds sand to the clay (adds, present) 2. Then he rolls the clay into long, pipe-shaped pieces. (Pipe-shape, past) 3.Another potters will use a potter's wheel . (will use, ...
*February 7, 2012*

**Information Systems**

Hi ..Can somebody suggest me some good ideas or topics for senior projects related to Information Systems. Thank You !
*February 1, 2012*

**social studies**

I don't know
*January 17, 2012*

**Algebra**

(1/2)*(30)*(38)= 570
*November 25, 2011*

**chemistry**

how can you tell if a combination in a mixture forms a precipatate or not?How can you tell from the sollubility table?
*November 20, 2011*

**english**

Leadership Traits of Effective Managers. I NEED SOME GOOD ARTICLES FOR THIS TOPIC.
*November 14, 2011*

**Economics**

The index most widely used by the government and the private sector to measure changes in the cost of living is the (a) the GDP deflator, (b) Producer Price Index, (c) The interest rate, (d) Consumer Price Index
*November 9, 2011*

**chemistry**

what is the binding energy of an electron in a photosensitive metal (in kj/mol) if the minimum frequency of light that can eject electrons from the metal is 6.3 x 20^14 Hz?
*November 7, 2011*

**chemistry**

thank you
*November 7, 2011*

**chemistry**

radium-266 may emit a photon of light with a frequency of 4.5x 10^19 s^-1 when it undergoes nuclear fission. what is the wavelength in pm of this photon?
*November 7, 2011*

**Physics**

A boy kicks a football with an initial velocity of 20 m/s at an angle of 30 above the horizontal. What is the vertical component of it's velocity at the highest point of it's trajectory?
*November 6, 2011*

**Physics**

A hockey puck slides off the edge of a table with the initial velocity of 20m/s. The table height is 2.0 m. What is the accleration of the puck right after it leaves the table?
*November 6, 2011*

**social studies**

what is common for pilgrims and our life?
*October 27, 2011*

**physics**

deez nuts
*October 26, 2011*

**physics**

Hayes fires a projectile from his air gun. The gun provides a constant 300 N of force on a 0.1 kg projectile as it travels through the 0.3 meter barrel. How fast is it going when it leaves? It starts from rest and there is no friction.
*October 24, 2011*

**Algebra**

invested $1,110.00, how much was his rate of interest?
*October 21, 2011*

**problem solving**

The greatest common factor of two nubers is one. What do you know about the numbers.
*October 19, 2011*

**math**

it is 9 am yor family vacation stars in new york city with a final estination in miami. you travel 58 miles every hour if you do not stop for meals or attractions.you first head to washington d.c.and you must stop for 1 hour lunch at noon. use rounding to estimate how many ...
*October 18, 2011*

**cal**

If a ball is thrown into the air with a velocity of 41 ft/s, its height (in feet) after t seconds is given by y = 41t − 16t^2. Find the velocity when t = 1.
*October 18, 2011*

**math**

a boy is blowing a spherical balloon at a rate of 50 cm3/s.at what rate is the radius of the balloon changing when the radius is 10 cm?give your answer to 2 decimal places.
*October 11, 2011*

**math**

a boy is blowing a spherical balloon at a rate of 50 cm3/s.at what rate is the radius of the balloon changing when the radius is 10 cm?give your answer to 2 decimal places.
*October 11, 2011*

**chemistry**

calculate how many mL of 6M HCL are needed to prepare 100mL HCL solution with a concentration of ~1M?
*October 10, 2011*

**Chemistry**

What is the final temperature after a 21.8 g piece of ice is placed into a styrofoam cup containing 114 g of hot water at 68.2 degrees C. Please explain because I don't even understand how to start.
*October 5, 2011*

**physics**

You are trying to ﬁnd out how high you have to pitch a water balloon in order for it to burst when it hits the ground. You discover that the balloon bursts when you have pitched it to a height of 14 m. With what velocity did the balloon hit the ground? The acceleration ...
*October 2, 2011*

**physics**

Judy, by chance, spots a potted plant falling outside the window at 2.04 m/s . Further down the same building, Judy’s boyfriend clocks the pot at 56 m/s . How far apart are the friends? The acceleration of gravity is 9.8 m/s 2 .
*October 2, 2011*

**Math**

At a party, if 1/3 of one sheet cake and 1/6 of another sheet cake remain uneaten, what fraction of a whole sheet remains uneaten .
*September 29, 2011*

**physics**

A 1200 kg car on a horizontal surface starts from rest and accelerates uniformly to 72 km/h in 20.0 s. Friction exets an average force of 450 N on the car during this time. a) what is the net work done on the car b) how far does the car move during this acceleration now i ...
*September 28, 2011*

**Math**

For 3 person relay, a coach can choose from 4 of his top runners. How many different 3- person teams can he choose?
*September 28, 2011*

**chem**

a piece of (density= 10.5 g/ml)dropped into water displaces 21.56 ml of water. what is the mass (in grams) of this piece of silver?
*September 27, 2011*

**computers**

I need some good links for technology newsletter related to information technology.
*September 27, 2011*

**Physics**

Vector A has a magnitude of 7 and is at an angle of 22.5 degrees measured counter-clockwise from the x axis. Vector B has a magnitude of 12 and is at an angle of 110.4 degrees measured counter-clockwise from the x axis. Vector C has a magnitude of 6 and is at an angle of 180 ...
*September 23, 2011*

**math**

-3 + x/1 = 3 Since any number divided by 1 =itself, we can simplify the x/1; -3 + x = 3 Since we want to get "x" by itself, so we can solve for "x," let's add a +3 to the -3 on the left. Remember, whatever we do to the left, we have to do to the right. ...
*September 22, 2011*

**math**

thous - hundreds - tens - ones 5 3 9 8 5 3 7 9 Thousands and hundreds are the same, so you can eliminate 1/2 of the numbers. Now, take a look at the ones and tens columns. . . What are the largest numbers? (9's) Which 9 holds the largest place value? i.e. 9 of 10s? OR 9 of...
*September 22, 2011*

**More Critical Thinking**

What do you think? Here is an example of a passage that contains an ought imperative by searching and asking Google: "What is an ought imperative): Never fuel your vehicle while the motor is running. If for some reason the vehicle starts moving, it could cause a serious ...
*September 20, 2011*

**algebra**

Find your least common denominator and convert all the fractions before you start to solve the equation. (LCD = 24 x/8 = 3x/24 1/6 = 4/24 6 = 144/24 Now the equation looks like this: x/8 - 4/24 = 144/24 Let's work to get x on one side, so add 4/24 to each side: 3x/24 = 144...
*September 20, 2011*

**Math**

I don't know if there is a formula or way to set up an equation, so I would just start a grid. Note: If your calculator doesn't have a % function or if doing by hand, remember percent means per 100; therefore, for example, 5% = .05 year 1 = 42,000 yr 2 5% = 42,000 x 5...
*September 20, 2011*

**algebra**

You may want to review the answer given to -100/-5 =
*September 20, 2011*

**social studies 7th**

Jefferson Davis Elected President of the Confederate States of America November 6, 1861 Who was president during the Civil War? If you were from a Northern state, you answered Abraham Lincoln. If you were from a Southern state, you may have answered Jefferson Davis. I would ...
*September 17, 2011*

**social studies 7th**

I think it started in 1861; therefore, 1861-1865. That's what I am finding with several different sites on a web search as well. You may want to confirm--JJ
*September 17, 2011*

**physics**

2.0
*September 17, 2011*

**Physics**

You lean over the edge of a building that is 106 meters above the ground and throw an object straight upwards. This object takes 3 seconds to reach its maximum vertical displacement above your hand and then falls to the ground. From the moment it leaves your hand, how long ...
*September 16, 2011*

**Math**

You've done the math to learn how many $20 bills Aunt May has that equals the $10,000. Based on how many $20 bills, spending 1 a day, you have answered the "how many days"! You've got it and done all the work; just think how the number of $20 bills relates to...
*September 15, 2011*

**math**

12 gray out of 64. Find the percent: 12 divided by 64 = ?? (you'll get a decimal, no need to move decimal to make a percent--just keep the decimal for the next step. Next step: 400 x the decimal found above = ?? and this answer will tell you how many gray sweatshirts to ...
*September 15, 2011*

**Math**

18 dimes = 1.80 7 qtrs = 1.75 Total = the $3.55 Can you work it backwards, as I have no idea how to set an equation. It was instinct for me to see that initially I had to break the 55-cents down and then work with the $3.00. I'm sorry I can't help with setting the ...
*September 13, 2011*

**geometry**

Hi Kayla, First determine your definition of a "prime number. (It can only be divisible by itself or 1, evenly.) Replace "n" with a number and add 1 to it; then test the definition. e.g., if N = 1; then 1 + 1 = 2 (Is 2 a prime number?) try again, e.g.if N = 3; ...
*September 8, 2011*

**Math**

I am doing homework and supposed to write down prime numbers up to 50, this is what I wrote down. (1,3,5,7,11,13,17,22,23,2731,33,35,37,41,43,45,47) Is there any numbers missing?
*September 7, 2011*

**Math**

Are these prime number correct all the way up to 50 (1,3,5,7,11,13,17,22,23,25,27,31,33,35,37,41,43,45,47 ) What kind of tens are prime
*September 7, 2011*

**PHYSICS**

Suppose you are given that z = c y2/x3 where c is some number. For a particular value of c, x and y, z is equal to 129. Suppose x is decreased by a factor of 2.3 and y is decreased by a factor 7.9. What is the new value of z?
*September 1, 2011*

**math**

To find an average get a total of the entries and divide by the number of entries. In this problem get a total of the expenses for the 4 weeks. Then, take that total and divide by 4 to get the average. Hope that helps! JJ
*August 28, 2011*

**PHYSICS**

Referring to the diagram, if c = 32 and theta is equal to 57.6 degrees, find the difference in the length of sides a and b. Another words determine the length of side a, determine the length of side b, and then subtract b from a (a - b). (For example if a = 10 and b = 2, then ...
*August 26, 2011*

**science**

1. You first need to find how many cm in an inch by going to a conversion chart or manipulating how many inches in a meter. It is much easier to go to a conversion chart. i.e, 1-inch = ?? cm. (Be sure you are going in the right direction. In other words you do NOT want to find...
*August 25, 2011*

**MATHS**

two circles c1 and c2 meet at the points A and B. CD is a common tangent to these circles where C and D lie on the circumference of C1 and C2 respectively. CA is the tangent to c2 at A. When produced DB meets the circumference of C1 at p. Prove that PC is parallel to AD
*August 18, 2011*

**Transcription**

Oh My! I was at that site a couple of times tonight and earlier this week. That's where I began my argument with the apostrophe and got twisted thinking that "speaking" was a participle, and as you can see, I got tangled. I have bookmarked with seeing your ...
*August 13, 2011*

**Transcription**

Another bell just rang. Apostrophe "s" means "his" in the old English, so with substituting "his," my light bulb confirms your answer. The gentleman's--his speaking. Oy Vey! Where was my head. . . .Onward, now! Thank you, again!
*August 13, 2011*

**Transcription**

Ah Ha! Nothing about MT is easy--LOL! I have to laugh at myself; since I started MT I feel like my years of background in both grammar and copy editing have had the rug pulled from underneath, causing me to have mono conversations that feel like they may need RX at times--LOL...
*August 13, 2011*

**Transcription**

Thank you Writeacher! Did I "goof" thinking that "speaking" is a participle/adj modifying English? TIA-JJ
*August 13, 2011*

**Transcription**

I'm on the fence about apostrophe or not in the following sentence. The possessive is not coming immediately before a noun or gerund; however, the English does belong to the gentleman. I realize a noun can show ownership to a noun that may have an adjective in front of the...
*August 13, 2011*

**Grammar MT**

You may want to check context and spelling of "mail." Diseases in the 3rd ed BOS no longer use the apostrophe s in front of the word disease, syndrome, etc; however, it would stay if the word disease, syndrome, etc were not included in the sentence, but implied. You ...
*August 13, 2011*

**physics**

An apple of mass 0.1kg is thrown from a 123 meter high building at an angle of 45 degrees with an initial velocity of 5. How long does it take for the apple to hit the ground? (assume g = 9.8 m.s-2)
*August 2, 2011*

**Algebra**

Tricia and janine are roommates and leave Houston on Interstate 10 at the same time to visit their families for a long weekend. Tricia travels west and Janine travels east. If Tricia's average speed is 12 mph faster than Janine's, find the speed of each if they are ...
*July 28, 2011*

**mod 4 child care management**

Supervising your staff each day and scheduling regular staff meetings are part of the _______ management approach. A. negative feedback C. preventative B. goal-oriented D. educational
*June 27, 2011*

**child care management mod 4**

Teachers in child care centers should meet which of the following educational qualifications? A. High school graduate B. High school graduate with some college course work in child development or early childhood education C. Two to four years of college (associate’s or ...
*June 26, 2011*

**operating system**

here is my code but have an error !! there are different classes. // this class creates the variables we are going to use in the threads public class Qs { int n; //creating an integer value boolean valueSet = false; //creating a boolean statement //creating a method with a ...
*June 1, 2011*

**operating system**

Two processes communicating using (memory locations “variables” or files).
*June 1, 2011*

**chem**

@DrBob222: is that the answer?
*May 31, 2011*

**chem**

I don't know
*May 31, 2011*

**chem**

yes i did that but the answer i get is weird
*May 31, 2011*

**chem**

*** I meant Kp = 4.0 x 10^18
*May 31, 2011*

**chem**

In an equilibrium mixture of HCl, Cl2 and H2, the partial pressure of H2 is 4.2 mPa and that of Cl2 is 8.3 mPa. What is the partial pressure of HCl at 500 oK given that at that temperature Kp = 4.0 x 1018 for H2(g)+ Cl2(g)--> 2HCl(g)
*May 31, 2011*

**Termodinamic**

Entalphy variation for C5H6COOH.
*May 20, 2011*

**chemistry**

How many moles of chloroethylene contain 5.47×10^26 molecules?
*April 22, 2011*

**biology**

DNA breaks apart when the _________ bonds between bases break??
*April 11, 2011*