Sunday

February 14, 2016
Total # Posts: 368

**physics**

change in potential energy divided by the power. ( 1 W = 1 J/s) Initial potential energy= mass* g* height = mass * g*0 = 0 Final potential energy = mass* g* 16.0 finf diffence between final and initial and divide by Power. Answer will be in seconds(s)
*October 12, 2009*

**physics**

How long will it take a 1920 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
*October 12, 2009*

**nutrition**

What are some of the health problems associated with anorexia nervosa, bulimia nervosa, and binge-eating disorder? Explain, from a physiological standpoint, how eating disorders may lead to health problems. Give at least three examples to support your answer.
*September 29, 2009*

**Algebra**

Suppose you are an event coordinator for a large performance theater. One of the hottest new Broadway musicals has started to tour, and your city is the first stop on the tour. You need to supply information about projected ticket sales to the box office manager. The box ...
*September 19, 2009*

**biology**

what does homeostasis means?
*September 17, 2009*

**physics**

a positive point charge q sits at the center of a hollow spherical shell. The shell, with radius R and negligible thickness, has net charge -2q. find an expression for the for the electric field strength (a) inside the sphere, r<R (b) outside the sphere, r>R. in what ...
*September 16, 2009*

**Math**

Find the sum of all n exterior angles of a n-sided convex polygon, where n is any positive integer larger than 3. Show all the working details and reasons. I already know that the total is 360 degrees, but how would I use mathematical proof to figure it out?
*September 3, 2009*

**Algebra**

Factor: 4x^2-12x+9
*August 5, 2009*

**statistics**

Four research participants take a test of manual dexterity (high scores mean better dexterity) and an anxiety test(high scores mean more anxiety) The scores are as follows.
*July 18, 2009*

**statistics**

Do students at various colleges differ in how sociable they are? Twenty-Five students were randomly selected from each of three colleges in a particular region and were asked to report on the amount of the time they spent socializing each day with other students. The results ...
*July 18, 2009*

**sattistics**

Twenty students randomly assigned to an experimental group receive an instructional program: 30 in a control group do not. After 6 months, both groups are tested on their knowledge. The experimental group has a mean of 38 on the test(with an estimated population standard ...
*July 18, 2009*

**statistics**

Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24- hour cycle of sleeping and walking- even if they are not exposed to the usual pattern of sunlight. To test ...
*July 18, 2009*

**Econ Please Help**

USE THE EXPENDITURE EQUATION FOR GDP TO FIND VALUES FOR EACH SECTOR FOR YEARS 1929 AND 1933
*June 30, 2009*

**chemistry**

What is an example of a specific mixture that could be separated with simple distillation and a specific mixture for which only fractional distillation would be used? I think a methanol-water mixture could be done with simple distillation, since they have b.p which are further...
*June 6, 2009*

**psych**

compare and contrast triat theory
*April 19, 2009*

**math**

1)what equation represents a line that is perpendicular to the line whose equation is -2y=3x+7? 2)if the measures of the angles of a triangle are reprsented by 2x, 3x-15, and 7x+15, is the triangle an acute triangle?
*April 7, 2009*

**science**

Who invented compass
*March 29, 2009*

**CHEM help needed**

how do i find the Volume of Atoms within Unit Cell in(Å^3)? I think it has something to do with avogadros number but i do not know exactly...so far i know that the volume of the unit cell is 47.045881 Å^3. PLEASE HELP
*February 14, 2009*

**CHEM HELP**

The partial pressure of water above a solution of water and a nonvolatile solute at 25oC is 19.2 mm Hg. What is the mole fraction of the solute please help....I really don't know how I am supposed to solve this question. I know that Partial pressure of the solvent above a ...
*February 13, 2009*

**CHEM please HELP**

thanks
*February 13, 2009*

**CHEM please HELP**

The boiling point elevation of a solution consisting of 2.12 g of a nonvolatile solute in 97.4 g of benzene is 0.6602 oC. What is the molecular weight of the unknown solute? i have no idea how to solve this question
*February 13, 2009*

**CHEM URGENT**

liquid methanol, CH3OH is being prepared to be poured into a beaker of water. (THERE CAN BE MORE THAN ONE ANSWER FOR Q1-3) 1) What intermolecular forces are broken in the methanol when these substances are mixed? -hydrogen-bonding -dispersion forces -dipole-dipole interactions...
*February 13, 2009*

**IT 210**

Sequential and Selection Process Control Structure
*February 13, 2009*

**art help needed**

1 false 2 true 3 true 4 false
*February 5, 2009*

**chemistry**

A 0.03 mol sample of NH4NO3(s) is placed in a 1 L evacuated flask, which is then sealed and heated. The NH4NO3(s) decomposes completely according to the balanced equation above. The total pressure in the flask measured at 400 K is closest to which of the following?
*January 8, 2009*

**hstory**

?what was signed in 1215,required the king to follow the same laws as other english people?
*December 4, 2008*

**5th grade**

how dud sqyabti, the interpreter for massasoit and the pilgrims. learn english
*November 20, 2008*

**12th grade chemistry**

A piece of iron wire weighs 2.225g. It is dissolved in acid, which oxidizes the iron to iron(II), and made up to 250 mL. A 25mL sample required 31.0 mL of a 0.0185mol/L solution of potassium dichromate. Calculate the percentage of iron in the wire.
*November 10, 2008*

**Chemistry**

A 156.5 g piece of stainless steel was heated to 510 C and quickly added to 25.11 g of ice at -30 C in a well-insulated flask that was immediately sealed. What will be the final temperature of the system if there is no loss of energy to the surroundings? How much liquid will ...
*October 26, 2008*

**Chemistry**

A 156.5 g piece of stainless steel was heated to 510 C and quickly added to 25.11 g of ice at -30 C in a well-insulated flask that was immediately sealed. What will be the final temperature of the system if there is no loss of energy to the surroundings? Does anyone know how I...
*October 26, 2008*

**spanish**

feliz yo cumpleanos estoy cuando es mi
*October 7, 2008*

**chemistry**

I did a lab in chemistry in which 15-mL jumbo Beral pipets with acetone was heated in boiling water until all of the liquid evaporated. Then the pipets were placed into room temperature water so that the evaporated liquid turns into condensed vapor. The molar mass was later ...
*September 24, 2008*

**6gr math**

78+m=
*September 8, 2008*

**math**

can not unscramble this math word sserwmt
*September 4, 2008*

**Math**

can not unscramble this math word mmttuoaeive
*September 4, 2008*

**Science**

What does copper react with when heated and what is formed as a result? (When you put copper underneath a fire, would the copper be reacting with oxygen or carbon dioxide?)
*September 1, 2008*

**Algebra**

The answer is 1:30 AM Thank You
*July 27, 2008*

**Algebra**

Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling 40 miles per hour. Train B is traveling 48 miles an hour. Train A passes a station at 10:25 pm. If train B passes the same station at 10:55 pm, at what time will train B catch up with ...
*July 27, 2008*

**Algebra**

In 1992, the life expectancy of males in a certain country was 69.8 years. In 1999, it was 72.6 years. Let E represent life expectancy in year t, and let t represent the numbers of years since 1992.
*July 27, 2008*

**chemistry**

whata the period block and group in which elements with the following electron configuration is located? a) [Ne] 3s^23p^4 b) [Kr] 4d^105s^25p^2 c) [Xe] 4f^145d^106s^26p^5
*May 20, 2008*

**algebra**

radicals
*May 11, 2008*

**Math**

SO how many mins. are in 900 s
*April 26, 2008*

**math**

thank you for the website it really helped me on my homework
*March 13, 2008*

**math**

an acute angle has how many degrees in it and how many degrees are in an obtuse angle
*March 13, 2008*

**math**

the square root of 1000 divided by 2 then multiplied by 100 to the fith power then minus 6 then timed by two equals?
*March 13, 2008*

**language arts**

what did john f Kennedy do as president?
*March 13, 2008*

**algebra II**

how do I work a exponential and logarithmic function on a TI83?
*February 5, 2008*

**physics 2**

a metallic object is given a positive charge by induction, does the mass change (increase, decrease, same)? what if given a negative charge instead? I think protons has more mass so mass increases and the opposite is true for electrons. Am I right?
*February 3, 2008*

**math**

y = ax + b, if the slope of the line is 1, what is the acute angle between the line and the x-axis?
*January 28, 2008*

**algebra**

a new parking lothas spaces for 450 cars. the ratio of spaces for fullsized cars to compact cars is 11 to 4. how many spaces are for full-sized cars? how many spaces for compact cars?
*December 12, 2007*

**Social Studies: Jim Crow Laws**

How did Jim Crow laws affect the economy?
*December 9, 2007*

**SCI 275**

I chose raw carrots as my vegetable. According to the chart, the energy gained compared to the energy lost was 10% gained to 90% lost. I would say this is clear evidence that humans need to consume foods closer to the bottom of the food chain so a higher amount of the original...
*November 12, 2007*

**UOP**

how do I punctuate this sentence? The goose bit the mailman on the leg.
*October 22, 2007*

**Math question**

How many 3by3 tile would it take to install a 12by18 floor.
*September 22, 2007*

**math**

sqrt of x-1=x-3 square both sides. Gather terms, factor or use the quadratic equation. I will be happy to critique your work.
*July 8, 2007*

**math**

(2x^sqrt of 2x)(3^sqrt of 5x)
*July 8, 2007*

**Electrochemistry**

A current of 2.50 A is passed through a solution containing Cu+2 ions for 4.00 hours. Calculate the mass of Cu atoms that form at the cathode. Charge= current*time Convert the charge in coulombs to number of electrons. Since it takes two electrons per Cu+2 atom, divide the ...
*May 17, 2007*

**Electrochemistry**

How much electric charge is needed to produce 1.000kg of Na metal from the Na+ ions in NaCl? You need one electron per atom. How many atoms are present in 1kg of Na? Use avagradros number. To change to coulombs, remember that 1 electron= 1.6E-19C
*May 17, 2007*

**tkngaspreureime**

unscramble these 14 letters to make two words--tkngasprureime
*April 19, 2007*

**unscramble letters**

unscramble 14 letters to make two words
*April 19, 2007*

**PLEASE HELP SOLVE RIDDLE**

1,3,4,6 = 24 USE NUMBERS ONCE YOU CAN + / * OR -.
*March 23, 2007*

**theology**

human reason wedded to truth Is this a question? Are we supposed to somehow metaphysically know the question associated with this? Do you have any thinking on this matter? The "truth" is "human" and "reason" are very seldom associated much less &...
*March 22, 2007*

**Science**

Describe the climate and physical characteristics of that biome and the types of organisms that live within it. Give examples of and describe symbiotic relationships between those organisms. Be sure to include at least one example from each of the following: parasitism, ...
*February 13, 2007*

**math**

For a dried flower arrangement, customers can choose from 2 types of containers, 3 sample designs, and 2 sizes. How many different arrangments does the shop offer? please post if possible in the by midnight tonight. Thank you
*January 23, 2007*

**Math [Probability]**

I'm in a Grade 12 Data Management Course. The Current unit is Factorials and Permutations. I'm having a trouble with this question. The answer is suppose to be 120 but I dont know how. How many different ways can 6 people be seated at a round table? Explain your ...
*September 10, 2006*

**math**

I need to know how to calculate what percentage of a number is to another. let me make that clearer, 35 is what percent of 48? how is that calculated? What you are asking is this: 35 is to 45 as x is to 100 or 35/48=x/100 solve for x x=.729 Now to get % you must multiply x by ...
*August 21, 2005*

**unscrambling word**

can not unscramble this math word mmttuoaeive
*June 14, 2005*