# Posts by Serena

Total # Posts: 271

**physics**

We confirm the concept of the geothermal effect in an alternative fashion to the discussion in the text. We know that the average rate at which heat is conducted through the surface of the ground in North America is 54.0 mJ/(s m2). Assuming a surface temperature of -2 oC, what...

**physics**

We consider hemoglobin along a 0.29 m long tube filled with water. The cross-sectional area of the tube is 326 mm2. The diffusion coefficient is 7 x 10^-11 m^2/s A total amount of hemoglobin of 1.22 x 10-12 g is transported in a steady rate along the tube in 24 seconds. What ...

**algebra**

what is the answer to x-5w=

**chemistry**

and i go to brock

**chemistry**

my lab is actually not until next week

**chemistry**

neutralization is -55.84kJ/mol

**chemistry**

when 12.76mL of HCl of unknown concentration (but less than the base) are reacted with 15mL of 3.254M NaOH, 1.68kJ of heat are released. What is the molarity of the HCl solution?

**chemistry**

the molar heat of neutralization is -55.84kJ/mol

**chemistry**

13.98mL of 2.902M HCl are reacted with 15mL of 3.198M NaOH. Use the molar heat of neutralization to determine the kJ of heat produced.

**physics**

If 842 J of heat is needed to increase the temperature of ethane gas (C2H6) in a 15 litre container from 237 K to 400 K, how much gas is in the container

**physics**

1.7 mol of an ideal gas which starts at 1.6 atm and 50 o C does 2.0 kJ of work during an adiabatic expansion. What is the final volume of the gas?

**physics**

Find the work for an isothermal expansion of 3.08 mol of an ideal gas at temperature of 18oC from pi = 4.55 atm to pf = 3.32 atm.

**physics**

A container of volume 14.2 cm3 is initially filled with air. The container is then evacuated at 0oC to a pressure of 32 mPa. How many molecules are in the container after evacuation if we assume that air is an ideal gas?

**physics**

"Calculate the internal energy for the air in human lungs after a regular inhalation. You find this volume discussed in the context of the spirometer (textbook p. 203). Hint: treat air as an ideal gas with the molecular mass M = 29.00 g/mol " Not sure the process to ...

**chemistry**

what is the hybridization of BrO2+

**Biology**

4.0 g of ferrous ammmonium sulphate, FeSO4(NH4)2SO4 6H2O, is used. Since the oxalate is in excess, calculate the theoretical yield of the iron complex. Please help with this question. Thank you.

**English**

Hi I am doing an article on why I think humans should not eat meat from the perspective of a parent with a child. I need three solid arguments for this; please help.

**Media**

Hi, I am doing an paper on editors and their roles in broadcast. I wanted to get some ideas about how editors choose their lead story and why they are led to choose that story. Any ideas? thanks

**math**

input ouput 2 8 7 3 5 5 0 0

**Math**

Convert from base 10 to the indicated base. 2500 to base 14 I got CA8 to the base of 14. Is that correct?

**math**

a pari of shoes is on sale for 10% off the original price. If the sale price is $14.40, what was the original price of the item?

**7th grade**

rosa wants to buy a computer desk that originally cost $650. It has been marked down to a new price of $520. What is the percent off?

**science**

a 1200W machine operates at 120V. what is the resistance of the machine?

**stock market**

If i invested 10,000 on 50 stocks that were 210.93 each, then the price of each went up to 217.00 each. How much did I earn?

**plants**

there are mechanisms that prevent pollination of one plant species by pollen from another. this would prevent a) the formation of hybrids between the pollen donor and the pollen receptor b) a waste of pollen c) pollen from attempting to develop on the stigma of an incorrect ...

**science**

what is the thing a candle holds?

**chemistry**

3.78kg Cu x (1000g/1kg) x (1 mol/63.546g) = 59.5 mol Cu 59.5 mol Cu x (13.05kJ/1mol) = 776 kJ evolved

**English**

Why does Gene not have an interest in Brinker in the book A Separate Peace?

**CMC220**

I was asking for someone to do the homework. Only asking for some good resources to assist with additional references for the assignment. I have about 600 words out of 750-1050 complete.The text book does not provide enough to complete the assignment without be repetitive. ...

**CMC220**

how each new medium affected news content and delivery, including how people engaged with news and how the media that preceded it adapted their content and delivery. Be sure to discuss newspapers, magazines, radio, TV, and satellite and Internet services.

**acc250**

Has anyone done the Sahron Clark, accouting in Peachtree? Just wondering how to enter the supplies on hand, to the adjusted trial balance. confused about this.

**algebra**

8x^3+27=0 8x^3=-27 x^3=-(27/8) x=-3/2 proof 8(-3/2)^3=27=0 8(-27/8)+27=0 -27+27=0 0=0

**biology**

How did the primordial atmosphere, photosynthesis, oxygen, the ozone layer, and the endosymbiotic theory influence the origin of living organisms?

**Mathematics**

A map drawn to scale of 1:50 000 with the actual distance between two points is 4.5km.Calculate the number of centimetres that should be used to represent this distance on the map.

**5th grade Math**

One tap can fill a barrel in 3 minutes and another can fill it in 6 minutes. Both taps are turned on together for 1 minute. What fravction of the barrel will be filled in 1 minute?

**social studies**

I come at the beginning of time, I come at the end of time, I come twice a week and once per year. What am I?

**english**

I need a 75-150 word response detailing what you have learned so far in the course.

**Math**

f(x) = 2x+4 and g(x)= x2-1 find (f * g)(4) find (g * f)(x) find f^(-1)(x)

**MATH PLEASE HELP!**

that right there is the question

**5th grade Math**

WAIT WHAT!!

**5th grade Math**

Insert parentheses to make this sentence true. 3*8+6 squared -8/2=26. My teacher told me I think that the parentheses go around the 3 and last 8. Is that true. How did you do that?

**math**

What does this have to do with preschool and what is your question?

**HR**

Thanks. Do you have any specific examples of areas in the world that have this challenge?

**HR**

What human resource challenges might a Canadian company face when operating globally? Give examples of two areas in the world and respond. Any suggestions?

**Calculus**

Approximate the area under the curve on the given interval using n rectangles and the evaluation rules (a)left endpoint, (b) midpoint and (c) right endpoint. y=(x+2)^(1/2) on [1,4], n=16 How am I suppose to do this?

**Reading**

Is there any flowers that rhymes with journal??????

**Reading**

Thanks if anybody can help me!! I need some words that rhymes with journal. Thanks!!!!!!!!!!!1

**Reading**

I have a question about dogs(shih tzu's) Is a shih tzu a mixed breed? Please Help me!!!!! :( :)

**LCD**

Is 6/28 the lowest common denominator or 3/7

**fractions: models**

11/10

**reading**

For the color codes evil represents red so what color represents happy?

**Science**

I am looking for ideas for 3rd grade recycleable inventions.

**physics**

Q=Area/Thickness*Heatconductivity*deltaTemp How you get this equation? and how you use the styrofoam=.03 J/s*m*C?

**physics**

At a picnic, a Styrofoam cup contains lemonade and ice at 0 degree C. The thickness of the cup is 2.0*10^-3m, and the area is 0.016m^2. The temperature at the outside surface of the cup is 35 degree C. The latent heat of fusion for ice is 3.35*10^5 J/kg. What mass of ice melts...

**4th grade Algebra**

How to solve this problem. 3X-Y=12

**Math**

OK I need so much help: i can't figure out this problem, and if i don't get it right i get an f on the assignmrnt: ok here is the problem: 5/6n+4= 5 7/8 HELP

**Social Studies**

4. ______Blank is one of the world's oldest civilation and Busch Garden's newest area. Answer: Egypt

**About previous Physics post/answer from Bobpursely**

So do you mean to say....Ferris wheels use motors, therefore meaning that electrical energy is present. Electrical energy from the motor is then turned into kinetic energy. Electricity, generated from a switch and wires, travel through the motor which makes a magnetic field. ...

**physics**

Parabolic...a projectile makes parabolic motion.

**Physics Stuff**

Hi, everyone who is going to read this, thank you for trying to help me, this really means a lot to me, you are saving my behind! Ok, so here it goes: I was wondering if this information is correct; please tell me if it is not A Ferris wheel is a vertical wheel...it undergoes ...

**biology**

Will macromolecule work?

**biology**

Posted above

**Physics and Dr. Bob**

Thanks, could you possibly ask someone with more physics knowledge to take a look at my posts, that would be awesome! Thanks very much, I am scanning that site right now!! S.

**Physics and Dr. Bob**

Not be to a nag, I was just wondering (in addition the energy section from my previous post)...in the wheel the electrical energy is present due to the motor. THis is then turned into kinetic energy, from the magnetic field that is created due to the copper coils surrounding ...

**Physics problems**

This is not helpful?

**Physics problems**

Hi, everyone who is going to read this, thank you for trying to help me, this really means a lot to me, you are saving my behind! Ok, so here it goes: I was wondering if this information is correct; please tell me if it is not A Ferris wheel is a vertical wheel...it undergoes ...

**What's another word for power-hungry?**

Greedy, corrupted, conceited (spelling)

**social studies**

What are the mummy-shaped figures that worked in the afterlife's fields for the mummy

**mathematics**

Your high school softball team won 80% of the games it played this year.If your team won 20 games, how many games did it play?

**math**

3,504

**Math(Geometry)**

number seven is the first letter of a number starting with one then continuing. number eight is the first letter of months starting with january then continuing.