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December 20, 2014

Posts by Julia


Total # Posts: 495

math
Vin paid $60 for 4 new DVDs. His friend Samuel paid $78 for 6 new DVDs. Who got a better deal?
October 19, 2011

physics
A particle starts from the origin at t = 0 with an initial velocity of 5.5 m/s along the positive x axis.If the acceleration is (-2.8i + 4.1jm/s^2, determine (a)the velocity and (b)position of the particle at the moment it reaches its maximum x coordinate.
October 16, 2011

solid mechanics 1
a load P is supported
October 12, 2011

solid mechanics 1
a load p is supported by a steel pin that has been inserted in a short wooden member hanging from the ceiling. the ultimate strength of the wood used is 60 MPa in tension and 7.5 MPa in shear, while the ultimate strength of the steel is 145 MPa in shear. knowing that b= 40 mm...
October 7, 2011

spanish
what is the difference gramtically between these two sentences Necesitamos sillas más cómodas. Se necesitan sillas más cómodas.
October 5, 2011

chemistry
How many moles of carbon, hydrogen, and oxygen are present in a 100g sample of ascorbic acid?
October 4, 2011

science
Is volume the amount of space an object takes up?
September 25, 2011

MAth
rewrite it as an addition problem. -4.8 + 4.9 = what? And then add 5.7 to your answer of -4.8 + 4.9 and that would be your answer.
September 25, 2011

physics
With an average acceleration of -.56 m/s2, how long will it take a cyclist to bring a bicycle with an initial speed of 13.3 m/s to a complete stop?
September 22, 2011

English
It would be a metaphor-is that correct?
September 20, 2011

English
1.What figure of speech is this? I think it is personification "Death stands above me, whispering low I know not what into my ear." simile litotes personification metonymy synecdoche 2.What figure of speech is this:The fog comes on little cat feet This one I hav no ...
September 20, 2011

Physics
A female gymnast weighs 400 N. If she is hanging stationary from a high bar, how many forces are acting on her?
September 11, 2011

science
design an expirament to test if the price of the gasoline affects the mileage in my car. find the dependent variable.
September 5, 2011

Science
bouyant force i think.
September 4, 2011

calculus
can you explain how you got both answers?
August 8, 2011

calculus
i dont understand the last step. how did you get to -1 + e^3 -1 = -2 + e^3
August 8, 2011

calculus
Find the sum of the series 2 + 9/2! + 27/3! + 81/4! . . .
August 8, 2011

Grammar
Unable to find her driver's license, Mary asked the agent whether a credit card would be sufficient enough evidence to prove her identity. Here, "sufficient enought" is the error. But I do not know why that is. Please explain in details! Thank you.
August 1, 2011

Chemistry :)
Balance the following redox equation and identify the element oxidized, the element reduced, the oxidizing agent, and the reducing agent. Show all of the work used to solve the problem. NO2- + Al AlO2- + NH3 Thanks :)
June 19, 2011

math
x+y+3z=600 x+y+z=400 1. In the system of equations above, what is the value of x+y? 2. There are 25 trays on a table in the cafeteria. Each tray contains a cup only, a plate only, or both a cup and a plate. If 15 of the trays contain cups and 21 of the trays contain plates, ...
June 17, 2011

grammer
firt grade, a diamante, noun, then two adjectives, then verbs ending in ed or ing, then related nouns, then more ing/ed verbs, adjectives, then noun.
June 13, 2011

grammer
what is a related noun? mom and i are stuck.
June 13, 2011

algebra
100.1
May 27, 2011

Chemistry
I forgot to add that in my experiment I used 1.2 grams of 10-52-10 plant food ( + 4 grams MgSO4 7H2O) and obtained 2.30 g of MgNH4PO4 6H20
May 27, 2011

Chemistry
need to calculate percent yield of MgNH4PO4 . 6H2O obtained in my experiment using 10-52-10 plant food label as a guide to determine the theoretical yield of MgNH4PO4 . 6H2O. My calculations so far: air dry weight of MgNH4PO4 . 6H2O = 2.30 g Grams of phosphorusin MgNH4PO4 ...
May 27, 2011

Physics
All right. Think of the trap door as a bar and draw a free-body diagram (FBD) with it as such. Assuming this is a uniform system, the center of mass will also be at the center of the door and that is also where gravity will be pulling on the door. Since the door is!@#$%^&ed at...
April 27, 2011

Physics
A trap door, of length and width 1.65 m, is held open at an angle of 65.0 degrees with respect to the floor. A rope is attached to the raised edge of the door and fastened to the wall behind the door in such a position that the rope pulls perpendicularly to the trap door. If ...
April 27, 2011

stats
salary study conducted. mean for men = $42,000. Std deviation = $9,000. mean for women = $39,000. Std dev for women = 8,000. If 100 men surveyed, at a CI of 95% what is the the most number of women surveyed if there was no Statistical difference in the mean for men and women?
April 26, 2011

Algrebra
What goes into 12 that goes into 36? 4 goes into 12 3 times and into 36 9 times. This can be simplified again by 3s. 3 goes into itself 1 time and into 9 3 times. So, your final answer would be 1/3rd.
March 10, 2011

algebra 2
I am not sure what "Solve each system" means, but I would assume with the given information that you need to solve for "c", then solve for "d" with the answer to "c". To do that, your equation would look like this.... 3c+2(4) = 2 3c+8 = ...
March 10, 2011

Finance
Ms. Sue, thank you for sending me this link. I am having trouble putting the pieces together to fit my problem above. Could you perhaps expain it a little further?
March 10, 2011

Finance
A U.S. Firm wants to raise $10 million of capital so it can invest in new technology. How much will it need to raise in order to net $10 million, using the average costs of raising funds.
March 10, 2011

grade 4 math
thank you!
February 28, 2011

grade 4 math
is that the answer?
February 28, 2011

grade 4 math
Several friends are taking turns flying akite. Each friend flies the kite for the same amount of time.They spend 6 hours flying the kite altogether. Explain whatinformation you need to find how long each friend flew thekite for.
February 28, 2011

math
Tierra, Nico, and Alex had $865 altogether. Tierra spent 2/5 of her money. Nico spent $40,and Alex spent twice as much as Tierra. If the three had the same amount of money left, how much money did alex have in the begging?
February 24, 2011

math
Tierra, Nico, and Alex had $865 altogether. Tierra spent 2/5 of her money. Nico spent $40,and Alex spent twice as much as Tierra. If the three had the same amount of money left, how much money did alex have in the begging?
February 24, 2011

math
Tierra, Nico, and Alex had $865 altogether. Tierra spent 2/5 of her money. Nico spent $40,and Alex spent twice as much as Tierra. If the three had the same amount of money left, how much money did alex have in the begging?
February 24, 2011

Physics-Could someone please help me?
Could someone provide me with a simple explanation of how the Doppler Effect is used to determine the speed and direction of moving object
February 23, 2011

Chemistry
How many kJ will be released as 575 g of steam at 176 degrees celsius are changed into ice at -75 degrees celsius?
February 22, 2011

Chemistry
How many kilojoules of heat energy are needed to change 49.6 g of ice at 15 degrees celsius to water at 58 degrees celsius? I am having trouble figuring out how to solve this.
February 22, 2011

Physics-Please help
Could someone provide me with a simple explanation of how the Doppler Effect is used to determine the speed and direction of moving object
February 22, 2011

Math
When I do 12 times 9.5 do I do 12 x 9.5 OR 12 x9.5 but I am pretty sure it is the first one. Thank you so much!
February 21, 2011

Math
4th word is HOW not hw
February 21, 2011

Math
To find out hw much inches are in 9.5 feet, do I do 12 times 9.5? I would do that because there is 12 in. in a foot.
February 21, 2011

physics
Roxanne is making a strawberry milkshake in her blender. A tiny .0050-kg strawberry is rapidly spun aroundhe inside of the container with a speed of 14.0 m/s, held by a force of 10.0N. What is the radius of the blender at this location?
February 20, 2011

Physics
Nevermind. I got something close to what I think I'm supposed to get (I calculated 3.71 s). The only thing is, when I plug my time back into the equation to check for correctness, I end up getting a negative 78.4 m, which obviously doesn't equal positive 78.4 m. Any ...
February 13, 2011

Physics
A brick is thrown vertically upward with an initial speed of 3.00 m/s from the roof of a building. If the building is 78.4 m tall, how much time passes before the brick lands on the ground? I think I may have gotten part of this question by first calculating how long it takes ...
February 13, 2011

math
what does squared and cubed mean?
February 9, 2011

Question
Does it have to be about math?
February 9, 2011

Social Studies
Is it in your book?
February 9, 2011

math
what is 6*10^9=
February 7, 2011

math
what is 3*10^6=
February 7, 2011

math
In bengal, india and Bangladashthere are about 2.6*10 to the power of 8. What is 2.6*10 to the power of 8 ?
February 7, 2011

math
u/5=1.9 what is u
February 7, 2011

statistics
Three percent of all items sold by a mail-order company are returned by customers for a refund. Find the probability that of two items sold during a given hour by this company both will be returned for a refund
February 7, 2011

Question
Thankyou
February 7, 2011

Question
Are students allowed to answer questions if we know them?
February 7, 2011

Spanish
Hello I was wondering if a fluent spanish speaker could look over my essay for spanish?
January 12, 2011

chem/plz/check work studying for a final
23. A 32.3 L sample of a gas at 305oC and 1.20 atm is to be cooled at constant pressure until its volume becomes 28.4L. What will be the new gas temperature? Tf = Vf*Ti/Vi Tf =28.4L x (305+273)K / 32.3L = (28.4)(578)K / 32.3 = 16415.2/32.3 Tf = 508K I got this one wrong on a ...
December 16, 2010

chem/plz/check work studying for a final
I guess I need to figure out the s.f. or stop rounding numbers.... :( thank you...
December 16, 2010

chem/plz/check work studying for a final
what is the volume occupied by 16.0g ethane gas (C2H6) at 720 Torr and 18C? V=nRT/P conversion of mol: 16.0g C2H6 X 1mol C2H6/30.07g C2H6= .53mol C2H6 V= .53 mol(0.0821 L*atm/mol*K)(291)K / 720 Torr (1 atm/760Torr) V= 13.5 L
December 16, 2010

chem/thank you DrBob22
thank you so much....your good, I wish you be my teacher I be passing my class with no problem....
December 16, 2010

chem/plz/check work studying for a final
A 20.5 lb cast iron boat anchor displaces 1.33 qt of water when submerged. What is the density of the cast iron, in g/cm3? 1L=1.057 qt 1kg=2.205lb 1lb=453.6g 20.5lb X 453.6g/ 1lb = 9298.9g 1.33qt X 1L/1.057qt = 1.26L 1.26L X 1000cm3/1L = 1260cm3 9298.9g/1260cm3 = 7.38g/cm3 **...
December 16, 2010

chem/plz/check work studying for a final
what is the volume occupied by 16.0g ethane gas (C2H6) at 720 Torr and 18C? V=nRT/P conversion of mol: 16.0g C2H6 X 1mol C2H6/30.07g C2H6= .53mol C2H6 V= .53 mol(0.0821 L*atm/mol*K)(291)K / 720 Torr (1 atm/760Torr) V= 13.5 L
December 16, 2010

algebra
Factor x2 - 100
December 15, 2010

chemistry
how many grams of CaCl2 must be dissolved to make 2.15 L of 0.05020 M Cl
December 14, 2010

chemistry
how many grams of CaCl2 must be dissolved to make 2.15 L of 0.05020 M Cl
December 14, 2010

italian language
A )Completare le farsi con il pronome personale opportune e con le desinenze del participio passato. 1-ALESSIA HA VINTO IL PRIMO PREMIO? ____GLI________ TELEFONO SUBITO E ____GLI _____DICO , SARA FELICISSIMA. 2- DEI COMPAGNI DI CLASSE HO RIVIST_O__SOLTANTO DUE . 3-ALBERTO E ...
December 8, 2010

italian
A )Completare le farsi con il pronome personale opportune e con le desinenze del participio passato. 1-ALESSIA HA VINTO IL PRIMO PREMIO? ____GLI________ TELEFONO SUBITO E ____GLI _____DICO , SARA FELICISSIMA. 2- DEI COMPAGNI DI CLASSE HO RIVIST_O__SOLTANTO DUE . 3-ALBERTO E ...
December 8, 2010

11th grade
In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.17 x 10^6 m/s. find the central force acting on the electron as it revolves in a circular orbit of radius 5.42 x 10^-11m.
December 5, 2010

Chemistry College
One reaction of iron with hydrochloric acid is represented by the following thermochemical equation. Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g); ΔH°= –87.9 kJ How much heat is liberated at constant pressure if 0.416 g of iron reacts with 42.0 mL of 0.457 M HCl? A...
December 2, 2010

chemistry
The answer doesn't fit with the choices given.
December 2, 2010

college
I believe it's suppose to be Pi/4 radians
November 30, 2010

chem/some1 check my work plz.
thank you for all your help Drbob222...just whish me luck for tomorrow in my test... :)
November 16, 2010

chem/some1 check my work plz.
air bags actived when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. this causes NaN3 to decompose explosively according to the following reaction: 2NaN3(s)=2Na(s)+3N2(g) what mas of NaN3 must be reacted to inflate an air bag...
November 16, 2010

chem/some1 check my work plz.
nitrogen gas contained in a cylinder with a volume of 5.0x10^2 mL @ a temp of 30C and pressure of 710 torr. The gas is then compresse to a volume of 25mL and the temp. is reaised to 820C. what is the new pressure of the nitrogen gas?? Pf=p1*v1*t1/Tf*Vf P=(700torr)(5.02x10^2mL...
November 16, 2010

chem/some1 check my work plz.
air bags actived when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. this causes NaN3 to decompose explosively according to the following reaction: 2NaN3(s)=2Na(s)+3N2(g) what mas of NaN3 must be reacted to inflate an air bag ...
November 16, 2010

chem/some1 check my work plz.
Thank u!!!!
November 16, 2010

chem/some1 check my work plz.
2NH3(g)+3CuO(s)=N2(g)+3Cu(s)+3H2O(g) if 18.1grams of ammonia reacts with 90.4 grams of copper(II) oxide, which is the limitting reagent?? what is the theorectical yield of nitrogen gasd? if 8.52 g of N2 are formed, what is the % yield of nitrogn gas?? please check if is ...
November 16, 2010

chem
thank u so much...
November 15, 2010

chem
An ideal gas in contained in a cylinder with a volume of 5.0x102mL at a temperature of 30C and a pressure of 710 torr. The gas is then compressed to a volume of 25mL, and the temperature is raised to 820C. What is the new pressure of the gas?
November 15, 2010

chem
ok..I see what i did wrong...thank u..ur the best!!!
November 15, 2010

chem
consider the following balance chemical equation: 2NH3(g)+3CuO(s)=N2(g)+3Cu(s)+3H2O(g) if 18.1grams of ammonia reacts with 90.4 grams of copper(II) oxide, which is the limitting reagent?? what is the theorectical yield of nitrogen gasd? if 8.52 g of N2 are formed, what is the...
November 15, 2010

chem/DrBob22
consider the following balance chemical equation: 2NH3(g)+3CuO(s)=N2(g)+3Cu(s)+3H2O(g) if 18.1grams of ammonia reacts with 90.4 grams of copper(II) oxide, which is the limitting reagent?? what is the theorectical yield of nitrogen gasd? if 8.52 g of N2 are formed, what is the...
November 15, 2010

chem
consider the following balance chemical equation: 2NH3(g)+3CuO(s)=N2(g)+3Cu(s)+3H2O(g) if 18.1grams of ammonia reacts with 90.4 grams of copper(II) oxide, which is the limitting reagent?? what is the theorectical yield of nitrogen gasd? if 8.52 g of N2 are formed, what is the...
November 14, 2010

thank u DrBoob22
omg...I was wondering where u...I'm studying for a test for weds and I'm so lost with most of this...thank u for your help...
November 14, 2010

chem
when an aqueous solution BaCl2 is mixied with an aqueois solution of Na2CO3, solid barium carbonate precipitates out of solution. write molecular equation, complete ionic equattionand net equation. is this the right formula?? BaCl2(aq)+Na2CO3(s)=BaCO3(s)????
November 14, 2010

chem
well it saids: A 1.50L rubber balloon is filled with carbon dioxide gas at a temperature of 0.00C and a pressure of 1.00 atm. the density of the carbon dioxide gas under these conditions is 1.98g/L. a)at 50.0C the balloon ha a vlomue of 1.78L. Calculate the carbon dioxide ...
November 14, 2010

chem/bobpursley
but i get 502.o and the answer in the back of my book said 2mL....so..
November 14, 2010

chem
well it saids: A 1.50L rubber balloon is filled with carbon dioxide gas at a temperature of 0.00C and a pressure of 1.00 atm. the density of the carbon dioxide gas under these conditions is 1.98g/L. a)at 50.0C the balloon ha a vlomue of 1.78L. Calculate the carbon dioxide ...
November 14, 2010

chem
at 50.0C the balloon ha a vlomue of 1.78L. Calculate the carbon dioxide density at this temperature.
November 14, 2010

chem
Liquid water has a density of 1.00g/mL at 10.0C and .996g/mL at 30.0C. Calculate the change in volume that occurs when 500mL of water is heated from 10.0C to 30.0C.
November 14, 2010

Thank you Dr.Bob222
Thank you, you don't know how much you have help me with my chem class...thank you so much..your the best!!
November 11, 2010

Thank you Dr.Bob222
Thank you, you don't know how much you have help me with my chem class...thank you so much..your the best!!
November 10, 2010

chem
for a combination reaction, it was calculated that 7.59g of A would exactly react with 4.88g of B. these amounts were reacted, and 9.04g of product was isolated. what was the percentage yield of reaction??
November 10, 2010

chem
supose 1.25 mol of N2 and 50.0g of O2 are moxied together. a)which one is the limiting reactant? b) what is the maximum mass in grams of NO2 that can be produced from the mixture? N2(g) + 2O2(g)=2NO2(g) ***please just show me how to set up the equations I would work the ...
November 9, 2010

chem
AgNO3+NaOH-->AgOH+NaNO3 give me molecular , total ionic and net ionic???"
November 9, 2010

chem
suppose you had an unknown solution that contained either dissolved NaOH, NaCl< or NaNO3. you add 4 drops of AgNO3 solution to 4drops of the unknown solution and observed that no solid formed. What can be concluded the unknown solution? why?
November 9, 2010

chem
in the following total ionic equation, which ions are spectator ions? Cu2+ (aq) + 2NO3-(aq)+2Na+(aq)+S2-(aq)--->CuS(s)+2NO3-(aq)+2Na+(aq)
November 9, 2010

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