Saturday

October 1, 2016
Total # Posts: 811

**Physics**

A ball is thrown straight down with a velocity of 12 m/s; what will be its velocity 2.0 s after being released? Please help me solve this!!

*September 25, 2016*

**History**

Explain how scientists use evidence to interpret history Explain the features of early civilizations Identify the effects of Neolithic Revolution on humanity thanks in advance

*September 21, 2016*

**World History **

Explain how scientists use evidence to interpret history Explain the features of early civilizations Identify the effects of the Neolithic Revolution on humanity

*September 20, 2016*

**Geometry**

E = hc/y , solve for the variable h

*September 18, 2016*

**Inorganic Chemistry**

How comes no answer for this????

*September 16, 2016*

**Physics**

How far does a runner travel if they maintain a speed of 8.5 m/s for 240 s?

*September 8, 2016*

**Physics**

During the first 50 s a truck traveled at constant speed of 25 m/s. Find the distance that it traveled.

*September 8, 2016*

**Physics**

A rabbit can cover a distance of 80 m in 5 s. What is the speed of the rabbit?

*September 8, 2016*

**Language Arts (Books)**

How does the writer use Elphaba to convey a message or a lesson in the book Wicked?

*September 5, 2016*

**PICOT Question**

I would like to to research on Concussions in College Football Players but am having trouble trying to use the PICOT to formulate a question. This is what I have so far: In college football athletes with concussions does current treatments and management compared to past ...

*July 18, 2016*

**Math**

a man can swim with a speed of 4 km per hr in still water. How long does he take to cross a river 1 km wide if the river flows steadily at 3 km per hr and he makes his strokes normal to the river current? How far down the river does he go when he reaches the other bank? Ans: ...

*June 30, 2016*

**Algebra**

Find K given y=200 when x=300

*June 13, 2016*

**Algebra**

Write the equation of the line in slope intercept form; passing through (3,11) with slope 7/3

*June 9, 2016*

**Algebra**

A is the point (4,-3) and b is (-1,1). Find the gradient of a line perpendicular to AB. Plz help!!!!

*May 24, 2016*

**Algebra**

Thank you John

*May 24, 2016*

**Algebra**

Write the gradient of the line perpendicular to the line with gradient. (a) 5 , (b) 7 , (c) -4 , (d) -9 , (e) 1/2 , (f) -3/4 , (g) 3/8 , (h) -2/3

*May 24, 2016*

**Chemistry**

How to convert 4.6-10.5 micrograms/dL to nmol/L? The answer is 59-135 nmol/L, but I have no idea how to set it up to get that answer.

*May 22, 2016*

**Math**

Match the math sentences that count up and back by tens. 47+40=88 57+30=87 46+10=56 56-10=46 87-40=47 87-30=57 Write the matching math sentences.

*May 18, 2016*

**Math**

Match/Choose the math sentences that count up and back by tens. 47+40=88 57+30=87 46+10=56 56-10=46 87-40=47 87-30=57 Write the matching math sentences.

*May 18, 2016*

**science**

How does the law of conservation of matter apply to mixtures? The law of conservation of matter is a law that states matter cannot be created or destroyed. But how does that affect mixtures HELPPPPP

*May 3, 2016*

**English**

What are the elements of the literary genres of suspense and horror? How is foreshadowing used to create suspense? What is an unreliable narrator? What are the characteristics of a stock character? What is the purpose of poetic devices such as assonance, consonance, and ...

*April 14, 2016*

**LOGARITHM**

Ln(2x-1)^2=7 solve for x. Please check my answer!!! =17.0577259793 Is this number too big?

*April 9, 2016*

**Logarithm**

Please check!!! =17.0577259793 Is this number too big?

*April 9, 2016*

**Logarithm**

Ln(2x-1)^2=7 solve for x. Really confused

*April 9, 2016*

**Logarithm**

Solve for x

*April 9, 2016*

**Logarithm**

Ln2+Lnx=1

*April 9, 2016*

**Math**

Thank you

*April 9, 2016*

**Math**

2e^3x=16 Solve for x. So far I changed this to 2ln3x=16 then ln3x=8 then...

*April 9, 2016*

**Math, science**

in 2009 an earthquake of magnitude 6.7 shook the kermadec islands off the coast of new zealand. also in 2009 an earthquake of magnitude 5.1 occured in the alaska peninsula. How many times stronger was the kermadec earthquake. Use formula log (I1/I2)=m1-m2 A.39.811 B.20.593 C.5...

*April 9, 2016*

**Algebra 2**

Thanks

*April 9, 2016*

**Algebra 2**

I am confused about his question. I 3000 times.04 times 10 and added that to 3000 to get 4200 but its not an option QUESTION::suppose you deposit $3000 in a savings account that pays interest in a a rate of 4%. if no money is added or withdrawn from the account, how much will ...

*April 9, 2016*

**Art**

The right answer is The figures of various community members :(

*March 30, 2016*

**maths,agricultur;life science,business**

Why are you asking this? Only you know what Sciences interest you; not us...

*March 16, 2016*

**Chemistry-DrBob222**

A 1.0 L ball containing Ar at 5 atm is connected to a 10.0 L ball containing N2 at 2atm. A)Calculate the partial pressures and mole fractions of Ar and N2 after the valve is opened and the gases are allowed to mix (they fill the balls on both sides). My answers: P argon = 0....

*March 11, 2016*

**Chemistry-DrBob222**

I know I pored this already, but I for it to mention the assumption. See below. A calorimeter contains 30.0 mL of water at 15.0 C. When 1.50 g of X (a substance with a molar mas of 46.0g/ mol is added, it dissolves via the reaction X (s) + H2O (l) ----> X (aq) and the ...

*March 11, 2016*

**Art Please Ms.Sue **

Which two cultures use creatures to protect or transport humans after death? America (bald eagle) and Spain (bull) Egypt (the animal-headed sons of Horus) and China (the dragon)***** Egypt (the jackal) and China (the lion) Mayans (the crow) and Greeks (the raven) What symbol ...

*March 11, 2016*

**Chemistry**

Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 9 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T = ...

*March 11, 2016*

**Art Please Ms.Sue Help**

Thank you your awesome. Ms.sue

*March 11, 2016*

**Art Please Ms.Sue Help**

1.How do landscape paintings convey the values and ideas of Chinese culture? A.Landscape paintings show chaotic, unhappy culture. B.Landscape paintings reveal the importance of natural history to the Chinese. C.Landscape paintings show that Chinese desire to live in simple ...

*March 11, 2016*

**Chemistry**

A calorimeter contains 30.0 mL of water at 15.0 C. When 1.50 g of X (a substance with a molar mas of 46.0g/ mol is added, it dissolves via the reaction X (s) + H2O (l) ----> X (aq) and the temperature of the solution increases to 26.5 C. Calculate the enthalpy change for ...

*March 11, 2016*

**Chemistry- DrBob222**

Please check. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 9 psi (vs. 14.7 psi at sea level). Under those conditions and ...

*March 11, 2016*

**Chemistry**

1. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 9 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T...

*March 10, 2016*

**Chemistry**

If I was designing an experiment where hydrogen gas was collected over a 0.1 M aqueous HCl solution from the reaction with zinc metal and I assume complete, rapid reaction, what mass of zinc would be used to collect between 50 and 100 mL of the gas? Note: I calculated using ...

*March 9, 2016*

**Chemistry**

What is the equilibrium constant for a weak acid HA that dissociates 1% at an initial concentration of 0.05 M according to the following balanced chemical equation? HA <----> H+ + A-

*March 8, 2016*

**Chemistry-DrBob222**

A 10.00 mL aliquot of 0.100 M NaOH is added to 15.00 mL of 0.100M HCl in a coffee cup calorimeter. The initial temperature of the two dilute liquids were both 25.0 degrees C and the final temperature of the mixture was found to be 37.8 degrees C. What is the (molar) heat of ...

*March 8, 2016*

**Chemistry-DrBob222**

A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees Celsius by reaction of 0.450 g of Mg (AW= 24.3 g/mol) with 50.0 mL of 1.0...

*March 8, 2016*

**Chemistry**

Two gases are mixed in a 10.0L fixed volume flask: 8.0 L of O2 at 2.00 atm and 2.0 L of N2 at 3.00 atm. A) Calculate the partial pressure for each gas and the total pressure. I got ... PO2 = 1.60 atm PN2= 0.600 atm B) How much (volume in liters) argon at 5.0 atm must be added ...

*March 8, 2016*

**Chemistry**

Two gases are mixed in a 10.0L fixed volume flask: 8.0 L of O2 at 2.00 atm and 2.0 L of N2 at 3.00 atm. A) Calculate the partial pressure for each gas and the total pressure. I got ... PO2 = 1.60 atm PN2= 0.600 atm B) How much (volume in liters) argon at 5.0 atm must be added ...

*March 8, 2016*

**Chemistry**

A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees Celsius by reaction of 0.450 g of Mg (AW= 24.3 g/mol) with 50.0 mL of 1.0...

*March 8, 2016*

**Chemsistry**

Write a balanced chemical equation for this: The RXN of hydronium ion with solid calcium carbonate to form calcium and bicarbonate (HCO3-) ions.

*March 7, 2016*

**Chemistry **

Write a balanced chemical equation for this: The RXN of hydronium ion with solid calcium carbonate to form calcium and bicarbonate (HCO3-) ions.

*March 7, 2016*

**8th grade language arts**

Has anyone deemed these answers correct? Found them useful?

*March 5, 2016*

**8th grade language arts**

Has anyone deemed these answers correct? Found them useful?

*March 5, 2016*

**Chemistry- Dr.Bob**

What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is the physical state of water liquid? The explanation from bobpursly was this The sum of heats gained =0 80(cice)(0+15)+80Hf+80cw(...

*March 1, 2016*

**Chemistry-Dr.Bob 222**

What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is the physical state of water liquid? I still don't understand how to do this.

*March 1, 2016*

**Chemistry**

What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is the physical state of water liquid? I don't understand the set up. The setup is like this (answered by bobpursly): The sum of...

*February 29, 2016*

**Chemistry**

CH4 (g)+ H2O (g) --->/<---- 3H2 + CO Use Le Chateliers Principle to explain what will happen to the number of moles of hydrogen at equilibrium when a) CO is removed b) Water Vapor is removed c) Methane is added d) CO is added e) Pressure is increased by adding argon gas...

*February 29, 2016*

**Chemistry**

CH4 (g)+ H2O (g) --->/<---- 3H2 + CO Use Le Chateliers Principle to explain what will happen to the number of moles of hydrogen at equilibrium when a) CO is removed b) Water Vapor is removed c) Methane is added d) CO is added e) Pressure is increased by adding argon gas...

*February 29, 2016*

**Chemistry**

What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is the physical state of water liquid? I don't understand the set up that I have to set the equation equal to 0 ...

*February 29, 2016*

**Chemistry**

I got 1.11 x 10^-6 for K. Here is my work: x= 0.004 -2x= -0.008 (change for CH4) Equilibrium for CH4 is 0.087 - 0.008= 0.079 Change in eq for C2H2 is 0.004 and eq is 0.004 (=x) Change in eq for H2 is 0.012 Eq for H2 is 0.012 K= [C2H2][H2]^3/[CH4]^2 K= (0.004)(0.012)^3/(0.079)^...

*February 29, 2016*

**Chemistry**

The reaction of CH4 in 2CH4(g) ---->/<---- C2H2(g) + 3 H2 (g) is carried out at a different temperature with an initial concentration of [CH4]=0.087M. At equilibrium, the concentration of H2 is 0.012 M. Find the equilibrium constant at this temperature.

*February 28, 2016*

**Chemistry**

how does one go about finding the Tf of this equation 100Hf+100cw(Tf-0) + 300w(Tf-25) =0 and can you also explain what cw and Hf mean? i have no idea.

*February 24, 2016*

**Chemistry**

What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is Tf= 109 C? Is it in the steam phase?

*February 24, 2016*

**Chemistry**

A 1.1% (w/w) solution of cocaine hydrochloride (molar mass 339.81 g/mol) in water. Calculate the molal concentration. Is it 0.0297 mol/kg?

*February 22, 2016*

**Math**

Please explain and show your work 2 3 -+- 3 4

*February 22, 2016*

**Chemistry-Dr.Bob 222**

1. The rate constant for a second order reaction has units of L mol^-1 s^-1. What are the units of the frequency factor, A, for a second order reaction?

*February 19, 2016*

**Chemistry**

Calculate the molal concentration. A 1% (w/w) solution of cocaine hydrochloride ( molar mass 339.81 g/mol) in water.

*February 18, 2016*

**Chemistry**

On a clear day at sea level, the partial pressure of N2 in air is 0.78 atm at 25 degres C. Under these conditions, the concentration of N2 in water is 5.3 x 10^-4 M. What is the partial pressure of N2 when the concentration in water is 3.5 x10^-4 M?

*February 17, 2016*

**Student**

On a clear day at sea level, the partial pressure of N2 in air is 0.78 atm at 25 degres C. Under these conditions, the concentration of N2 in water is 5.3 x 10^-4 M. What is the partial pressure of N2 when the concentration in water is 3.5 x10^-4 M?

*February 17, 2016*

**Economy **

Can anyone compare and contrast N. korea and S. Korea economic provisions on private property ? Then compare to the U.S. Economic provisions on private property ? I'm really confused and I don't know much of the subject. This was a Classwork qtn. Thanks.

*February 16, 2016*

**Economics**

4. Deregulation and the Cost of Trucking. Suppose the government initially limits the number of trucking firms that can haul freight. The market for truck freight is served by a single firm that produces five million ton-miles of service per year, where one ton-mile is the ...

*February 14, 2016*

**Chemistry**

A solution containing equal masses of glycerol, C3H8O3, and water has a density of 1.10 g/mL. Calculate the molality of glycerol. I got 11.9 m.

*February 14, 2016*

**Chemistry**

A first-order reaction has a half-life of 26.4 seconds. How long does it take for the concentration of the reactant in the reaction to fall to one-eighth of its initial value?

*February 14, 2016*

**Chemistry**

1. As the intermolecular forces between molecules increase in magnitude, do you expect each of the following to increase, decrease or remain the same? My answers: Viscosity: increase Boiling point: increase Vapor pressure: decrease Surface tension: increase Heat of ...

*February 14, 2016*

**Chemistry**

A solution containing equal masses of glycerol, C3H8O3, and water has a density of 1.10 g/mL. Calculate the molality of glycerol. I got 11.9 m.

*February 14, 2016*

**Chemistry**

1. As the intermolecular forces between molecules increase in magnitude, do you expect each of the following to increase, decrease or remain the same? My answers: Viscosity: increase Boiling point: increase Vapor pressure: decrease Surface tension: increase Heat of ...

*February 13, 2016*

**Chemistry-Dr.Bob**

The solubility of CO2 in water at 25 degrees Celsius and P CO2= 1 atm is 0.034 mol/L. What is its water solubility under normal atmospheric conditions (in air, carbon dioxide is about 380 ppmv assuming that CO2 obeys Henry's Law?

*February 13, 2016*

**Math**

The volume of a rectangular prism is 6x^3 -x^2 -2x. Which model could represent the rectangular prism? A. Height: 3x-2 Length: 2x+1 Width: x B. Height: 3x+2 Length: 2x-1 Width: x C. Height: 3x-2 Length: 2x-1 Width: x D. Height: 2x-2 Length: 3x+1 Width: x I don't understand...

*January 29, 2016*

**Math, pre-algebra**

The volume of a rectangular prism is 6x^3 -x^2 -2x. Which model could represent the rectangular prism? A. Height: 3x-2 Length: 2x+1 Width: x B. Height: 3x+2 Length: 2x-1 Width: x C. Height: 3x-2 Length: 2x-1 Width: x D. Height: 2x-2 Length: 3x+1 Width: x I don't understand...

*January 29, 2016*

**Connexus Help me!!**

Congratulations, Shantee!! When is your baby due? Is it a boy or a girl? Good for you!

*January 27, 2016*

**Math**

Our difference is 6. We have a sum of 14. What numbers are we? We know number 10. How did you find 4? Please describe and solve the riddle.Write the number sentence.

*January 26, 2016*

**Math **

F(x) = square root of x-6 -5

*January 22, 2016*

**Algebra **

Find the perimeter of the triangle whose vertices are the following specified points in the plane (-2,-7) (1,-6) and (-7,7)

*January 13, 2016*

**Algebra **

Find the perimeter of the triangle whose certified are the following specified points in the plane (5,-1) (-9,3) and (0,1

*January 12, 2016*

**U.S History**

Ms. Sue please help I really need it!!!

*January 5, 2016*

**U.S History**

Which of these describes the location of the Gulf of Mexico? (5 points) South of West Florida East of East Florida*** West of New Orleans South of Great Britain 4. © 2012 The Exploration Company What can you infer about what Lewis and Clark saw as they moved west from the...

*January 5, 2016*

**U.S History**

Ms. Sue please help!!!!

*January 5, 2016*

**U.S History**

Which of these describes the location of the Gulf of Mexico? A. South of West Florida B. East of East Florida C. West of New Orleans D. South of Great Britain I think its A.

*January 5, 2016*

**Algebra **

The perimeter of a square must be greater than 40 inches but less than 94 inches. Find the range of possible side lengths yay satisfy these conditions.

*January 5, 2016*

**Algebra **

8w less than or equal to 9w - 5 or 1-4w > 25. Enter the solution using interval notation?

*January 5, 2016*

**Algebra**

Among all rectangles that have a perimeter of 184, find the dimensions of one whose area is largest. Write your answers as fractions reduced to lowest terms.

*January 4, 2016*

**Math **

Find the standard form for the equation for the circle center (-4,7/4) and tangent to the y axis

*January 4, 2016*

**Algebra**

Compare the graph of a compound inequality involving and with the graph of a compound inequality involving or.

*December 21, 2015*

**Algebra**

What compound inequality represents the phrase "all real numbers that are greater than or equal to 0 and less than 8"

*December 21, 2015*

**Algebra**

Write an inequality for Six times a number increased by 38 is no more than the number decreased by 14

*December 20, 2015*

**Algebra**

Whats an inequality for negative three sevenths of a number is at least 102.

*December 20, 2015*

**Phyical Science**

I already got the answer

*December 14, 2015*

**Phyical Science**

Which is more expensive to create wind power or natural gas?

*December 14, 2015*

**Inequalities**

Write two different inequalities that you can solve by adding 5 and multiplying by -3.

*December 13, 2015*

**Math**

A system of equations is shown below: x + y = 3 2x − y = 6 The x-coordinate of the solution to this system of equations is _____. I'm thinking it could be X=3

*December 11, 2015*