Saturday

October 25, 2014

October 25, 2014

Total # Posts: 87

**Differential Equations**

Consider the system shown below of two masses of mass m, coupled together between two fixed walls via springs with varying spring constants. Let x(t) and y(t) be the horizontal displacements of the two masses as a function of time. (a)Write down a system of differential ...
*October 13, 2014*

**chemistry**

A 0.5917 g sample of a pure soluble chloride compound is dissolved in water, and all of the chloride ion is precipitated as AgCl by the addition of an excess of silver nitrate. The mass of the resulting AgCl is found to be 1.5683 g. What is the mass percentage of chlorine in ...
*March 3, 2014*

**chemistry**

When aqueous solutions of potassium hypochlorite and nitric acid are mixed, an aqueous solution of potassium nitrate and hypochlorous acid results. Write the net ionic equation for the reaction. Use H+ for the hydronium ion.
*March 3, 2014*

**Chemistry 1150**

Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction: NH4NO3(s)→NH+4(aq)+NO...
*February 25, 2014*

**Physics**

A speedboat increases in speed from 21 m/s to 30.9 m/s in a distance 191 m. a)Find the magnitude of its acceleration. Answer in units of m/s^2. b)Find the time it takes the boat to travel this distance. Answer in units of s.
*February 5, 2014*

**math**

8x + 5y = -144 4x + y = -36
*November 5, 2013*

**chemistry**

. Which of the following will result in a chemical change? A. Melting ice to obtain water B. Evaporating alcohol into vapor C. Drying wood in a shed D. Burning coal in a furnace 2. A salt is obtained as a reaction between A. a nonmetal and a metal. B. a base and water. C. an ...
*July 2, 2013*

**Physics**

A student applies a force of magnitude 39.0 N at an angle of 22.6o with the horizontal to push a 4.00-kg textbook 1.00 m across a table from rest to a final speed of 1.75 m/s. Find the work done by friction on the textbook.
*July 18, 2012*

**Personal Finance**

What does it mean by 401k Investment Vehicles?
*June 14, 2012*

**personl finance**

What does it mean by 401k Investment Vehicles?
*June 13, 2012*

**chemistry**

The presence of a catalyst provides a reaction pathway in which the activation energy of a certain reaction is reduced from 188 kJ/mol to 86 kJ/mol which increases the rate of the reaction. How many times faster is the reaction with the catalyst at 307 K, all other factors ...
*June 12, 2012*

**chemistry**

I did that for both temperatures and divided both of them by each other but my answer is incorrect.
*June 12, 2012*

**Introduction to Psychology**

Alexander, a fifth- grade teacher, believes that Kimberly's behavior is a result of poor parenting, The school concerned with her inability to focus, attend to directions, and recall information from the previous day or events from earlier in the day.
*May 30, 2012*

**Introduction to Psychology**

Behavioral and Psychodynamic perspectives differ in that the former emphasizes the ______ while the latter focuses on _____.
*May 30, 2012*

**Introduction to Psychology**

Dr. Hall believes that thought processes determine behavior.She encourages her patient to examine the way he looks at problems and solves problems. They look for successful and unsuccessful evaluations and strategies.
*May 30, 2012*

**math**

ht tp://ww w.you tube.c om/watch?v=xjV HHE22r3I
*March 14, 2012*

**RES/341**

ht tp://ww w.you tube.c om/watch?v=xjV HHE22r3I
*March 14, 2012*

**College Physics - Acceleration**

ht tp://ww w.you tube.c om/watch?v=xjV HHE22r3I
*March 14, 2012*

**Math **

Beaufort Scale and Wind Effects 0 Smoke rises vertically 1 Smoke shows wind direction 2 Wind felt on face 3 Leaves move, flags extend 4 Paper, small branches move 5 Small trees sway, flags beat 6 Large branches sway, flags beat 7 Large branches sway, walking is difficult 8 ...
*February 22, 2012*

**math**

Beaufort Scale and Wind Effects 0 Smoke rises vertically 1 Smoke shows wind direction 2 Wind felt on face 3 Leaves move, flags extend 4 Paper, small branches move 5 Small trees sway, flags beat 6 Large branches sway, flags beat 7 Large branches sway, walking is difficult 8 ...
*February 16, 2012*

**algebra**

If a pro basketball player has a vertical leap of about 20in., what is his hang time? Use the hang time function v=49t^2
*November 9, 2011*

**algebra**

Rationalize the denominator, assume that all expressions under radicals represent postive numbers. sqrt:a - sqrt:b/sqrt:a + sqrt:b
*November 8, 2011*

**Math**

you are welcome i hope that helped you
*October 20, 2011*

**Math**

on what i was taught is move the decimal back until you cant move it back and count how many times you had moved it and you will have that many 0s
*October 20, 2011*

**Math**

350/1000 thats the answer
*October 20, 2011*

**math**

thank you very much ms.Sue
*October 20, 2011*

**math**

To advertise their business, Toni and Mandy can either purchase flyers or e-mail addresses. They can print, distribute and pay the postage of 3 million flyers for $450. Find the unit price for the flyers.
*October 7, 2011*

**algebra**

thanks for the help Damon
*August 2, 2011*

**algebra**

Write an equation of the line containing the specified point and parallel to the indicated line.(1,4)3x+y=5
*August 2, 2011*

**Chemistry**

An unsaturated hydrocarbon is a hydrocarbon containing at least one double or triple bond.
*May 10, 2011*

**honors geometry**

That's kind of hard to imagine, but it seems to me you just plug 9 in into the formula... Please clarify if I'm wrong.
*May 10, 2011*

**Biology**

It definitely would affect the economy, since people eat that.
*May 10, 2011*

**Critical Thinking (philosophy)**

questions 1-25
*April 30, 2011*

**Human Development**

Blake amuses and challenges his teachers with his independent thinking. He’s self-reliant and responds appropriately to corrections and criticism. Blake’s parents probably use the _______ style of child rearing. A. permissive C. authoritative B. authoritarian D. ...
*March 29, 2011*

**math**

How much money must I start out with if I want to end up with 20,000 over 5 years with and intrest rate of 5% a year.
*February 14, 2011*

**chi-square test**

the assumptions for using a chi-square test. Research articles provide practical examples from the research to support your assumptions. Include a citation of one article you used for your research
*December 15, 2010*

**analysis of variance **

which analysis of variance should be applied when an experiment has more than one independent variable. Discuss the assumptions and limitations of the analysis of variance in comparison with the t test including a discussion of post hoc tests
*December 15, 2010*

**statistic**

how a t Test for a dependent variable can be of great value in applying a new approach to the treatment of aggressive behavior to a small group of students. Why would this t Test be preferred to using another test statistic?
*December 15, 2010*

**hypothesis statistic**

how a t Test can be employed in hypothesis testing by the use of directional vs. nondirectional hypotheses. Discuss types of research where using the t statistic may be an appropriate alternative to using a z-score. Respond to at least two of your fellow students’ ...
*December 15, 2010*

**AP Calculus**

True or False If f'(c)=0=f''(c)is less than 0, the f(c) is a local maximum. Justify your answer.
*December 15, 2010*

**psy325**

For each of the following samples that were given an experimental treatment, test whether these samples represent populations that are different from the general population: (a) a sample of 10 with a mean of 44, (b) a sample of 1 with a mean of 48. The general population of ...
*December 15, 2010*

**psy325**

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3
*December 15, 2010*

**chemistry**

Why is the ionic compound NaCl (table salt) able to dissolve in a glass of the molecular compound water (H2O)?
*November 29, 2010*

**chemistry**

If 35.8 grams of LiCl are dissolved in 184 grams of water, what is the concentration of the solution in percent by mass?
*November 29, 2010*

**chemistry**

What would be the resulting molarity of a solution made by dissolving 21.9 grams of KCl in enough water to make an 869-milliliter solution?
*November 29, 2010*

**chemistry**

If 2.1 moles of CaCl2 are dissolved in enough water to make a 0.92-liter solution, what is the resulting molarity?
*November 28, 2010*

**chemistry**

if it requires 35.0 milliliters of 0.50 molar NaOH to neutralize 25.0 milliliters of HCl, what is the concentration of the HCl solution? Balanced equation: NaOH + HCl yields NaCl + H2O
*November 17, 2010*

**chemistry**

If 2.1 moles of CaCl2 are dissolved in enough water to make a 0.92-liter solution, what is the resulting molarity? 0.44 M CaCl2 0.70 M CaCl2 2.3 M CaCl2 3.0 M CaCl2
*November 7, 2010*

**chemistry**

Water is a polar solvent. Which of the following will not dissolve in water? sugar table salt vinegar olive oil
*November 7, 2010*

**chemistry**

How many liters of fluorine gas, at standard temperature and pressure, will react with 23.5 grams of potassium metal?
*October 31, 2010*

**chemistry**

Under certain conditions, neon (Ne) gas diffuses at a rate of 7.0 centimeters per second. Under the same conditions, an unknown gas diffuses at a rate of 4.9 centimeters per second. What is the approximate molar mass of the unknown gas? 6.5 g/mol 11 g/mol 20 g/mol 41 g/mol
*October 31, 2010*

**chemistry**

78.4 liters thank you!
*October 31, 2010*

**chemistry**

What is the volume of 3.5 moles of oxygen gas (O2) at standard temperature and pressure (STP)? 6.4 L 22.4 L 32.0 L 78.4 L
*October 31, 2010*

**chemistry**

Which of the following gases effuses the fastest at a given temperature? Ne CH4 Ar H2
*October 31, 2010*

**chemistry**

How many grams of methane gas (CH4) are in a 15.8 liter sample at 1.2 atmospheres and 27°C
*October 31, 2010*

**chemistry**

Under certain conditions, neon (Ne) gas diffuses at a rate of 7.0 centimeters per second. Under the same conditions, an unknown gas diffuses at a rate of 4.9 centimeters per second. What is the approximate molar mass of the unknown gas?
*October 31, 2010*

**algebra II**

If a pro basketball player has a vertical leap of about 25 inches, what would his hang time be? Use V=48T^2 Answer:_______seconds.
*October 23, 2010*

**Eurpoean History **

Late 1800s to early 1900s
*October 21, 2010*

**Eurpoean History **

How did imperial forces entice resistant countries into submission? What role did the promise of democracy play? In your opinion, was this promise kept? Why or why not?
*October 21, 2010*

**algebra**

sarah has dimes and nickels which total $1.65. the number of nickels she has is 3 less than the number of dimes. how many of each does she have?
*October 17, 2010*

**math**

i posted a different question. why did they get deleted?
*October 16, 2010*

**math**

two planes take off from an airport at the same time and head in opposite directions at 260 mph and 275 mph respectively. in how many hours will they be 1605 miles apart?
*October 16, 2010*

**math**

a coast guard ship left the port at 30 mph. four hours later a helicopter was dispatched at 90 mph to intercept the ship. how long will it take the helicopter to catch the ship?
*October 16, 2010*

**algebra**

an insecticide originally contained 1/2 oz of pyrethrins. the new formula contains 5/8 oz of pyrethrins. what percent of pyrethrins of the original formula does the new formula contain?
*October 9, 2010*

**algebra**

Solve by elimination 7r-5s=41 5r+7s=61
*October 5, 2010*

**math**

ok thanks i thought it was that simple, just wanted to check my answer.
*June 26, 2010*

**math**

Evaluate 80mi/h x 3 h Be sure to use the proper units
*June 26, 2010*

**math**

is that 40 square feet?
*June 23, 2010*

**math**

A rectangular window is 5 ft by 8 ft. Becky wants to replace the glass in the window. How many square feet of glass should she buy?
*June 23, 2010*

**geometry**

Let A = {circle, square} and let B = {3, 4, 5}. Find A X B
*June 18, 2010*

**11th grade English**

Write your own journal entry from the perspective of a member of Bradford's colony. What do you think of these unruly pirates? What shocks you the most about these surly characters? How do the manners of the pirates differ from yours?
*May 16, 2010*

**Government**

What's the U.S model of corporate control? What are its consequences for the American society?
*May 1, 2010*

**college trig**

From a point on the ground a person notices that a 110-ft tree on top of a hill subtends an angle of 3°. If the angle of elevation to the bottom of the tree, represented by angle A in the figure below, measures 37°, find the height h of the hill
*March 26, 2010*

**College Chemistry**

A 38 L gas tank at 35 Celsius has nitrogen at a pressure of 4.65 atm. The contents of the tank are transferred without loss to an evacuated 55.0L tank in a cold room where the temperature is 4 Celsius. What is the pressure of the tank??
*March 2, 2010*

**us history**

FGAFA AAVXA DGAVX VADAD DVDDD VGAV
*December 2, 2009*

**us history**

cryptogram grid
*December 2, 2009*

**Health**

What short-term and long-term health conditions are direct consequences of the obesity epidemic? What individual and societal changes can help reverse the obesity epidemic?
*April 28, 2009*

**governmnet**

Describe the basic character of the unitary states. how can one reconcile the concept of the unitary state with the principles of the Declaration of Independence?
*April 2, 2009*

**college**

what kind of government does the Gayanashagowa represent?
*April 2, 2009*

**Calculus**

Find the maximum and minimum values of f(x,y,z)=x+4y+5z on the sphere x^2+y^2+z^2=1.
*November 19, 2008*

**finance**

suppose the Wrights found that both Tom and Sue had a life insurance protection gap of $50,000. Present the steps in sequence how Wrights should proceed to search for protection to close that gap?
*June 25, 2008*

**math**

one decimeter is equal to....how many centimeters
*March 27, 2008*

**Math**

.8x/.8 = 12,590/.8 x= 15,737.50 But where did you get 0.8 from?
*March 11, 2008*

**Math**

The sales price of a car is 12,590, which is 20% off the original price. What is the Original price?
*March 11, 2008*

**Math**

If sally can paint a house in 4hrs, and John can paint the same house in 6hrs, How long will it take for both of them to paint the house together?
*March 11, 2008*

**Math**

Jim is able to sell a hand-carved statue for $670 which was a 35% profit over his cost. How much did the statue originally cost him? How do you find the answer to this?
*March 11, 2008*

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