# Posts by Julia

Total # Posts: 659

**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

**Chemistry**

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

**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.

**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

**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!

**Math**

4th word is HOW not hw

**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.

**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?

**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 ...

**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 ...

**math**

what does squared and cubed mean?

**Question**

Does it have to be about math?

**Social Studies**

Is it in your book?

**math**

what is 6*10^9=

**math**

what is 3*10^6=

**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 ?

**math**

u/5=1.9 what is u

**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

**Question**

Thankyou

**Question**

Are students allowed to answer questions if we know them?

**Spanish**

Hello I was wondering if a fluent spanish speaker could look over my essay for spanish?

**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 ...

**chem/plz/check work studying for a final**

I guess I need to figure out the s.f. or stop rounding numbers.... :( thank you...

**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

**chem/thank you DrBob22**

thank you so much....your good, I wish you be my teacher I be passing my class with no problem....

**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 **...

**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

**algebra**

Factor x2 - 100

**chemistry**

how many grams of CaCl2 must be dissolved to make 2.15 L of 0.05020 M Cl

**chemistry**

how many grams of CaCl2 must be dissolved to make 2.15 L of 0.05020 M Cl

**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 ...

**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 ...

**math**

6:4

**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.

**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...

**chemistry**

The answer doesn't fit with the choices given.

**college**

I believe it's suppose to be Pi/4 radians

**chem/some1 check my work plz.**

thank you for all your help Drbob222...just whish me luck for tomorrow in my test... :)

**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...

**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...

**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 ...

**chem/some1 check my work plz.**

Thank u!!!!

**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 ...

**chem**

thank u so much...

**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?

**chem**

ok..I see what i did wrong...thank u..ur the best!!!

**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...

**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...

**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...

**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...

**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)????

**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 ...

**chem/bobpursley**

but i get 502.o and the answer in the back of my book said 2mL....so..

**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 ...

**chem**

at 50.0C the balloon ha a vlomue of 1.78L. Calculate the carbon dioxide density at this temperature.

**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.

**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!!

**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!!

**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??

**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 ...

**chem**

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

**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?

**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)

**math**

how does the integral of cscx = ln|cscx - cotx|+C and ln |tan x/2|+C?

**Chemistry- volumn**

chemistry: 50mL HNO3 + 50.5mL HaOH = volumn?

**chemistry**

1. Because a N2 bond takes much more energy to break because it is a triple bond whereas H2 bond is relatively easy to break 2. use the Arhenius equation to obtain a ratio of 0.3078

**chem**

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

**intro to chem**

Thank you Drbo22...but if it dosent make sence I'm sorry but that's what the tearche wrote in the paper he gave us...

**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 ...

**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

**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.

**Spanish**

How do I say in sentence form my favorite holiday is christmas and the date.

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

Thank you

**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

**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...

**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.

**PHYSICS**

thanks you so much

**PHYSICS**

A 9.5-kg monkey is hanging by one arm from a branch and is swinging on a vertical circle. As an approximation, assume a radial distance of 80 cm between the branch and the point where the monkey's mass is located. As the monkey swings through the lowest point on the circle...

**Physics**

riding in a car at constant velocity and see an open manhole. I take out an watermelon and hold it out window. My speed is 10m/s and the initial height of watermelon or any fruit is 1 m. I need to do a calculation to be able to know how far ahead of manhole I have to drop ...

**Physics**

I riding in a car at constant velocity and see an open manhole. I take out an watermelon and hold it out window. My speed is 10m/s and the initial height of watermelon is 1 m. I need to do a calculation to be able to know how far ahead of manhole I have to drop watermelon so ...

**geometry**

6

**English-Ms. Sue could you look at this**

I'm not sure who is the speaker in The Journey-is it your conscience or someone else looking back? Please give me your opinion

**English**

Who is the speaker in Journey by Mary Oliver.Is it your conscious directing you, telling you what you must do?

**Orgo - recrytalization**

thanx

**Orgo - recrytalization**

180mg of crude benzoic acid was recrystallized in an appropriate solvent, with a percent recovery of 67%. How much benzoic acid was recovered?

**italian**

ok thanks anyway !!

**italian**

i don't want it from internet but self made

**italian**

i need an essay in italian about the shopping mania.please help me

**Spanish**

Thank you

**Spanish**

Is this correct how I answered these two questions? Donde vive presidente de los Estados Unidos? My answer: El presidente vive en Washington, D.C. De donde es tu amigo? Answer: El amigo es de Colombia. I know I didn't use accent marks-I will put those in, just wanted to ...

**math**

I can't find the definition and a picture example of distance-time-rate of speed. Help!

**english**

Make a list of expressions that are followed by the '-ing' form

**Math - Rational Roots**

1.) What are the possible rational roots of the function f(x) = 3x^4 - x - 2 2.) What are the rational roots of the following equation: x^3 - 4x^2 - 4x +16 = 0 Thank you for any help!

**physics**

What equation should I used for a water bottle rocket lab? I am using distance vs volume of water. Of course, the volume of water is my independent variable. What equation should I use for this lab?

**Child Psychology**

guidance counselor

**ALGEBRA**

well, it also has a graph with a landscape layout but it will not past into this is there another way i can submit it for help? I am looking for someone to help with a few assignments

**ALGEBRA**

Landscape Design Landscape designers often use coordinate geometry and algebra as they help their clients. In many regions, landscape design is a growing field. With the increasing popularity of do-it-yourself television shows, many homeowners are becoming amateur landscape ...

**prealgebra**

THANK YOU!!!

**prealgebra**

the value, v, of a shopkeepers inventory software program is given by v= -(1)/(2)t+5 where t is the number of years since the shopkeeper bought the program. What is the program worth 4 years after its first year purchased? Plot the point with the given t-value, 4

**Math - Calculus**

What is the domain of this function?: y= ln(2x-12)