Thursday

December 18, 2014

December 18, 2014

Total # Posts: 929

**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**

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*

**math**

The two equal angles would be represented by x each and then the 3rd angle would be 2x + 16 to represent the 16 more than twice. The sum of the three angles is 180 degrees, so 1x + 1x + 2x + 16 = 180. combine like terms (x's). Now you should have a two-step equation of ...
*April 10, 2011*

**Math**

Since the angles are all compared to the second angle, let x (also known as 1x)= 2nd angle; therefore first angle which is twice the second = 2x and the third angle which is three times the second = 3x. All angles of a triangle have a sum of 180 degrees. 1x + 2x + 3x = 180 now...
*April 10, 2011*

**math**

Solve 1/2x - 7 = 21
*April 10, 2011*

**College Algebra**

F(x)=6000(1-25/(x+5)^2)
*April 6, 2011*

**English - Native speakers**

Okay, I know conductor is also a person who checks if passengers in buses or trains have tickets. Also called a ticket collecter. The woman/man helping a woman give birth is a MIDWIFE What do you mean by indefinite time contract? I can't answer that The accounts are a ...
*March 31, 2011*

**Math**

Hi! I need to work out how much water is used per minute in my showerhead, per toilet flush, each dishwasher load, washing machine cycle and taps. How would you suggest I do this if I cannot access the information online? Thanks
*March 31, 2011*

**Maths**

Hi! I need help. I have worked out total rainfall, I have the monthly average (given by beauro) and I worked out the mean rainfall each month. My teacher says I need to work out the amount of rainfall in m-cubed that would fall on the roof each month. How would I do this? ps. ...
*March 31, 2011*

**English**

Okay so you're writing about social networking aren't you? Broaden it a bit. Basically you are talking only on how it helps you stay connected. Why don't you add in about how its changed the way we keep up with current events NOTE: Libya and Egypt organised revolts...
*March 31, 2011*

**business**

Hmmm good question. Is it becuase they have an obligation to sociaty as leaders? Is it because they exist in society as well? Is it because without society they wouldn't survive? Is it becuase it is a sign of being a good person? Is it because businesses have got alot of ...
*March 31, 2011*

**English**

Okay read through it. Where you take breaths or give pauses add your commas, where you don't I'd take them away. Where you say words that you haven't typed add them and where you don't say words, take them out of your text. Good luck!
*March 31, 2011*

**Psychology**

I'd guess d... But I'm not sure
*March 30, 2011*

**world history**

Think about it: US financed TWO WORLD WARS. Right so all that money comes right in. ONly entered WW2 after pearl harbour so not a long period of war left, ditto on ww1, only entered last year of war. So obviously would have spent less and been in better shape than the other ...
*March 30, 2011*

**English**

If you appeal it your trail will go to the Corte d'Assise d'Appello. you might appeal to the Cassarzio but only the law will be reviewed and you will have a new trial scheduled int eh Corte d'Assise d'Apello!
*March 30, 2011*

**English**

Firstly, don't expect a quick resolution, the court system takes forecver. Secondly, you have no right to a lawyer before you see a judge Thirdly, it will probably be the Corte d'Assise because accessory to murder is pretty serious.
*March 30, 2011*

**English**

I'm assuming by processed you mean how does it go through the court heirachy?
*March 30, 2011*

**English**

What do you mean by processed?
*March 30, 2011*

**writing**

Take out the comma in the first sentance. It should read ...town and looking. change everything after help manage to: help manage the sales department of JR's Fashions. change the comma after position are to a semi-colan. ...for the position are; scheduling appointments ...
*March 30, 2011*

**English - Native speakers**

Yep thats exactly right!
*March 30, 2011*

**English - Native speakers**

yeah, so place names capatilized all else normal text.
*March 30, 2011*

**English - Native speakers**

Generally no,you don't write them with capitals. The exception is place names like North Daktoa or the South Pole. See when you use north in the way you said in the second sentance its a common noun, like car or sun. Its confusing, I know. Does this help?
*March 30, 2011*

**Math**

Hi! I'm working on a math assignment and I was wondering if someone could check my math on this. PLZ! Create a model of Tank B. Find the approximate capacity Assuming that the overflow pipe is 100cm below the top of the tank, therefore the revised overflow height equals 0....
*March 30, 2011*

**Fher**

Arect = length x width So you find different factors of the area and you should be able to answer the question competently. As long as you communicate well you might even get extra marks for 'alternate answers'
*March 30, 2011*

**math**

96=x+y x= 96/2 y=96/2
*March 29, 2011*

**7th grade **

Okay so 2x+1=9 We move the 1 over to the other side of the equal sign, which means the equation now reads 2x=9-1 solve this 2x=8 now we divide both sides by 2 (its the multiplier of x and we want to split them apart) x=4 TaDa! With your brakets 2(2t-1)= 14 Okay so firstly we ...
*March 29, 2011*

**ETH**

Well yes probably. If you mean people like refuges or those who are being oppressed in their own country.
*March 29, 2011*

**General**

Yes I have tried Google scholar, but my teacher is telling us to rely on other search engines as well. Thanks for your help! XD
*March 29, 2011*

**General**

Are their any search engines I can use besides bing and google? Any places I can access historical journals? Thanks!
*March 29, 2011*

**3rd grade math**

12
*March 29, 2011*

**5th grade math**

960 divided by 8
*March 29, 2011*

**math**

The mean weight of 75 2nd graders is 55.7 lbs and the mean weight of 25 1st graders is 42.6 lb. What is the mean weight of the 100 children
*March 28, 2011*

**computers**

A relational database for a real-world client what would be the example ?
*March 25, 2011*

**math**

solve this problem using the power rule (10x^8) x (10x^10) =
*March 8, 2011*

**geometry regular polygon**

302.4cm^2
*March 6, 2011*

**ap chemistry**

methanol and ethanol are common organic solvents. if the mole fraction of CH3OH in a mixture of the two solvents is 0.4 what is the mole fraction of methanol in the vapor in equilibrium wih the liquid mixture at room temperature 25 celius. the vapor pressure ofmethanol and ...
*February 23, 2011*

**physics**

Vector vector A has a magnitude of 27 units and points in the positive y-direction. When vector vector B is added to vector A , the resultant vector vector A + vector B points in the negative y-direction with a magnitude of 18 units. Find the magnitude of vector B ?
*February 10, 2011*

**physics**

1.403
*February 1, 2011*

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