Saturday

September 20, 2014

September 20, 2014

Total # Posts: 482

**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*

**math**

how does the integral of cscx = ln|cscx - cotx|+C and ln |tan x/2|+C?
*November 7, 2010*

**Chemistry- volumn**

chemistry: 50mL HNO3 + 50.5mL HaOH = volumn?
*November 5, 2010*

**chem**

calculate the molality of a solution that has 1.02kg sucrose (C12H22O11), dissolved in 554g water.
*October 27, 2010*

**intro to chem**

Thank you Drbo22...but if it dosent make sence I'm sorry but thats what the tearche wrote in the paper he gave us...
*October 27, 2010*

**intro to chem**

disolving sucrose, NaCl< and calcium chloried affect the boiling point of frezing point of water. Assuming that you have 0.1m solution of all these 3 compounds: a)rank then in order of decreasing freezing point. b) rank in order of increasing boiling point c)why do the ...
*October 27, 2010*

**math**

thank you soooooooo much! this really helped me allot! ( had an answer on my paper didn't know it so I looked it up) he he (:c) <-- monkey
*October 20, 2010*

**english**

someone can help me with a discription with this KEY WORDS: advertising billboards, buskers, clowns, drama groups, fireworks, graffiti, 'live statues', musicians, open-air concerts, pavement artists, sculptures, statues.
*October 18, 2010*

**Spanish**

How do I say in sentence form my favorite holiday is christmas and the date.
*October 12, 2010*

**Algebra-Pleasehelp-I'm so stuck!!**

Thank you
*October 11, 2010*

**Algebra-Pleasehelp-I'm so stuck!!**

Please help How do you graph the radical that is below negative of the sqrt(x+1) my teacher said we should set up x and y according to parent function. The endpoint of this would be (-1,0) How do I find the other points-I'm really stuck
*October 11, 2010*

**physics**

A man pulls a crate of mass 61.0 kg across a level floor. He pulls with a force of 178.0 N at an angle of 20.0� above the horizontal. When the crate is moving, the frictional force between the floor and the crate has a magnitude of 124.0 N. If the crate starts from rest...
*October 8, 2010*

**PHYSICS**

A jet flying at 135 m/s banks to make a horizontal circular turn. The radius of the turn is 3810 m, and the mass of the jet is 1.82*10^5 kg. Calculate the magnitude of the necessary lifting force.
*October 5, 2010*

**PHYSICS**

thanks you so much
*October 5, 2010*

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