Tuesday

July 29, 2014

July 29, 2014

Total # Posts: 281

**Physics**

Nevermind, thanks!

**Physics**

Thank you, but I still don't understand the steps that you took.

**Physics**

1 g/cm^3 = _________ kg/m^3 I tried converting g to kg and then cm to m, and then dividing. I get the answer 1x10^(-1). When I type in this problem on the internet, many sources say it is 1000. I am very confused as to how this answer was reached.

**Biology**

B. Microevolution evolution.berkeley.edu/evolibrary/article/evoscales_02

**Math**

Deceleration uniformly, a car traveling 25 m/s takes 10 seconds to come to a complete stop. What is the magnitude and direction of the car's acceleration as it slows down? North at 2.5 m/s (2) South at 2.5 m/s (2) North at 9.8 m/s (2) South at 25 m/s

**Math**

Deceleration uniformly, a car traveling 25 m/s takes 10 seconds to come to a complete stop. What is the magnitude and direction of the car's acceleration as it slows down? North at 2.5 m/s (2) South at 2.5 m/s (2) North at 9.8 m/s (2) South at 25 m/s

**Biology**

Volume of RBCs in venous circulation increased by 3% than than of RBCs in arterial circulation, why?

**Chemistry**

Given the following chemical reaction what is the bond enthalpy of OH 4NH3 3O2 yields 2N2 6H20 Change H 1266 kJ NH equals 389 O O equals 498 and N N equals 941 3

**Science**

A box that is initially at rest is pushed by a person at an angle 0 with a force F until it reaches a speed of v. The coefficient of kinetic friction between the box and the surface is U. Is this: work done by person equal to magnitude of friction F work done by person greater...

**chemistry - exam practice help!!**

if you have your text on you, you think you can help me out with number 77 on pg 859 ? i have no clue how to do it :S

**chemistry - exam practice help!!**

np. number 13 is like this : first find moles of Ag which is volume (in L) times molarity. should get 0.15 moles Ag. to convert to coulombs you multiply it by faraday's constant. (approx 96500 C/mol) . the units will cancel out the moles and you should be left with 1.45 * ...

**chemistry - exam practice help!!**

10 is b) its a 2:1 ratio so you multipy the rate by 1/2 and 25 is 110.6 kj. first you find delta H , then delta S , then you put those values into : delta G = delta H - T*deltaS

**chemistry - exam practice help!!**

For the cell shown below, which will increase the cell voltage the most? Fe2+ | Fe3+ || Cu2+ | Cu A) Halve[Cu2+] B) Double[Cu2+] C) Double[Fe2+] D) Halve[Fe2+] E) Cut Cu electrode in half ... Ecell = E0 cell + 0.059/n * log([Cu+]/[Fe2+]) Ecell is directly proportional [Cu+] to...

**chemistry - exam practice help!!**

Given the table below predict the numerical value of the standard cell potential for the reaction: 2 Cr(s) + 3 Cu2+(aq) 2 Cr3+(aq) + 3 Cu(s) Half Reaction E (volts) (1) Cr3+ + 3 e- Cr E= -0.74 (2) Cr3+ + e- Cr2+ E=-0.41 (3) Cr2O72- + 14 H+ + 6 e- 2 Cr3+ + 7 H2O E= 1.33 (4) Cu+...

**Chemistry**

i figured it out, i have to multiple the concentration by 2 because of the 2 hydroxides right? and yes i do know # 4 you want to convert 0.0354 mg/mL at 1 atm to mol/L at 0.00036 atm. so : (0.0354 mg/mL) x ( 0.00036) = 1.2744 x 10^-5 mg*CO / mL then you just want to convert un...

**Chemistry**

determine the pH of a 0.116 M Ba(OH)2 solution at 25 degrees C. i keep getting 13.06 for this answer, but the answer is 13.37 :S what i do is i take the negative log of the concentration which is 0.9355 which is pOH. i know that pH = 14 - pOH so i get pH = 13.06 where am i goi...

**Chemistry**

sorry it was a typo, 11.54. but still , you are right. 5.04 / 16 = 0.315 so answer ended up being the same in the end. thank you !

**Chemistry **

Is this done right? White phosphorous, P4, spontaneously bursts into flame in Oxygen gas. if 6.5 g of white phosphorous reacts completely with oxygen to form 11.54g of a phosphorous oxide, what is the empirical formula of this oxide? this is what i did: total = 11.4 g , P4 = 6...

**chemistry - exam practice help!!**

wow, i don't know how i missed that connection before. of course, its simple. i must be getting too nervous for my test lol. Thank you so much for clearing that up for me!

**chemistry - exam practice help!!**

thank you! and yes the 1,045 was a typo , but how did you know that the change row in the ice table for NaF under Na+ and F- were gonna be 1.045 ? wouldn't they be x as well ? that's just the only part that messes me up. :S

**chemistry - exam practice help!!**

i'm not exactly sure how to do this question :/ i dont even know where to start. "Determine the equilibrium [F-] of the following solution with initial concentrations od [HF]= 1.296 M and [NaF] = 1,045 M (ka for HF is 6.6 * 10 ^ -4) options are a) 1.046 b) 0.251 c) 2....

**physics**

A particle starts from the origin with a velocity of 6.0 i m/s and moves in the xy plane with a constant acceleration of (-2.0i + 4.0j)m/s^2 . at he instant the particle achieves maximum positive x-coordinate, how far is it from the origin?

**physics- TEST TMRW PLS HELP!**

how would i do this? -----------------A-----------B-------- I<----1.5m------>l<--0.6m-->l<-0.3m->l a carpenter carries a 6kg board . the downward force he feels on his shoulder (A) is .... ? (B is where his hand is) pls help!! i have so much difficulty with t...

**physics- TEST TMRW PLS HELP!**

there are basically two forces acting on the object. so do i find the resultant force first and then cross that with r?

**physics- TEST TMRW PLS HELP!**

w w w . m e d i a . c h e g g c d n . c o m / m e d i a / a c 3 / a c 3 b b 1 e 1 - 5 b a 8 - 4 1 9 e - 9 a 8 4 -a d 5 0 e 4 6 a 2 9 4 e / p h p s U O o L 3 .p n g (delete all spaces for link to work) Determine the magnitude of the resultant moment produced by the forces about...

**physics**

pls explain this to me ? "momentum is inertia....but inertia is NOT momentum" :S confused

**physics- TEST TMRW PLS HELP!**

thank you so much!

**physics- TEST TMRW PLS HELP!**

Why is the following situation impossible? A librarian lifts a book from the ground to a high shelf, doing 20.0 J of work in the lifting process. As he turns his back, the book falls off the shelf back to the ground. The gravitational force from the Earth on the book does 20.0...

**physics- please explain**

Why is the following situation impossible? A librarian lifts a book from the ground to a high shelf, doing 20.0 J of work in the lifting process. As he turns his back, the book falls off the shelf back to the ground. The gravitational force from the Earth on the book does 20.0...

**Chemistry**

Thank you!

**Chemistry**

What are three common types of products produced by reactions that occur in aqueous solutions? (out of the following) -gases -water -electrons -precipitates -acids -ions -bases

**Education**

I think that the correct answer is B. How children should behave. An objective is a goal that you would like to reach, so that is probably the most reasonable answer. "Behavioral Objectives: These types of objectives indicate the specific behaviors students must demonstra...

**Chemistry**

Why is the formula for sodium nitrate NaNO3?

**CHEMISTRY**

Someone answered this question before.

**Chemistry**

Thank you so much!

**Chemistry**

How do “chemical” salts form? Thank you in advance.

**Chemistry**

Why is the use of tin limited?

**Chemistry**

What does the reaction of alkaline earth metals with water tell you? Thanks in advance.

**Chemistry**

Oh OK, thank you!

**Chemistry**

Would it be a cation? Thank you in advance.

**Chemistry**

When hydrogen reacts with a metal, does it form a cation or an anion?

**chemistry**

You have to put " Pb(OH)4(aq) " in square brackets... [Pb(OH)4]2–(aq)

**math**

3 and 10

**8th Grade Science**

a= (Vf - Vi) / t

**8th Grade Science**

a= (31km/hr - 29km/hr) / 5sec a= 0.4 km/hr/s That's how I got one of the answers....I am confused at what you are trying to show me.

**8th Grade Science**

This involves the acceleration formula.

**8th Grade Science**

A runner whose initial speed is 29 km/hr increases her speed to 31 km/hr in order to win a race. If the runner takes 0.5 seconds to complete this increase in speed, what is her acceleration? I think it's either 1440 km/hr/hr or 0.4 km/hr/sec. Are you supposed to convert th...

**math**

i am wonder how to do divsion

**physics**

a golf ball is hit off a tee witha speed of 50m/s at an angle of 37 degrees above the horizontal. At what two values of x (horizontal distance from the tee) will the ball be 25m above the ground?

**physics**

a golf ball is hit off a tee witha speed of 50m/s at an angle of 37 degrees above the horizontal. At what two values of x (horizontal distance from the tee) will the ball be 25m above the ground?

**social studies**

Thanks

**social studies**

What would be the dangers of working in a factory like the Highland Park Plant in Henry Ford's time?

**Math**

What do you want us to do?

**HISTORY**

Me. I have already answered though...

**HISTORY**

Please finish the sentence!

**HISTORY**

I believe that the boundaries I created for nations of the Middle East would be a force for cooperation rather than conflict because...

**History- check my essay!**

Here is my answer again: Winston Churchill, a strong leader who told it like it was. He was a true British man. Churchill was not afraid to stand up for what he believed in. He would never give up or surrender. Churchill would always have the British spirit within him, all the...

**History- check my essay!**

Can someone tell me what they think of what I wrote? Here is the question and my answer: (This homework question was removed due to a copyright claim submitted by K12 Inc.) Answer: Winston Churchill, a strong leader who told it like it was. He was a true British man. Churchill...

**math**

You could always just multiply the two denominators together and get 96!

**math**

x/24 = 3/8 You have to get the same denominator. So, multiply 3/8 by 3/3, and you would get 9/24. 9 is your answer.

**Calculus**

Express the limit as a definite integral on the given integral, [5pi,3pi]. limit notation: cos(xi)/xi

**Language Arts**

Thank you! :)

**Language Arts**

Are these real words? surfeitly surfeitness surfeitous

**calculus**

Boat A leaves the dock at 12pm heading due South at a constant speed of 20 km/h. Meanwhile, at 12pm Boat B, a pirate ship, is 15 km due West of the dock where boat A started, and is sailing due East at a constant speed of 15 km/h. If the pirates get within 10 km of another boa...

**Language Arts**

Thank you, Ms. Sue.

**Language Arts**

Do you know the names of those websites?

**Language Arts**

Are there any websites that I can use to actually find the information?

**Language Arts**

I have to do some research of the poor in the Victorian Era. These are some things that I have to look for: 1. What kinds of programs were in existence to help the poor? 2. What was a poorhouse? 3. What was Debtor's prison? 4. Why were the poor, poor? Are there any website...

**physics**

If you walk at 1 m/s down the aisle of a bus that is moving at 10 m/s along the road, how fast are you moving relative to the road when you walk toward the front of the bus? Toward the rear of the bus?

**math**

f/5g = h

**power point**

animation, because it MOVES it around

**algebra**

sorry...suBtraction

**algebra**

PEMDAS 1. Parenthesis 2. Exponents 3. Multiplication/Division 4. Addition/Suntraction

**poer point**

design theme, because everything is based around a theme (ex. Hawaiian party, everything is Hawaiian)

**Science**

I typed in iced tea powder, iced tea, etc... And only shopping results came up. Thank you.

**Science**

Does anyone know where to find facts about iced tea powder? ex. who made it, where did it come from, anything!

**sunshine math**

wait....what is sunshine math?

**sunshine math**

4+6+(8/2) 10+4 =14

**Science**

Thank you very much. :)

**Science**

Are there any interesting facts on estuaries?

**algebra**

y=7-3x y=13+x h=f/5g

**math**

At the Whistlestop Cafe, 15 of the 19 patrons are mechanics. If a sample of 8 is taken, what is the probability that exactly 5 patrons are mechanics? Round your answer to 4 decimal places.

**math**

At the Whistlestop Cafe, 15 of the 19 patrons are mechanics. If a sample of 8 is taken, what is the probability that exactly 5 patrons are mechanics? Round your answer to 4 decimal places.

**Social Studies cont.**

This is not in my book. I already checked. But thank you!

**Social Studies cont.**

Explain a very negative outcome of these explorations.

**Social Studies**

Thank you!

**Social Studies**

Prince Henry had a school for sailors and for the advancement of navigation. Where did he send ships?

**6th grade**

What is the congruence?

**science**

I think that my science teacher said that the moon is made up of the same material as earth. I'm not sure...

**Language Arts**

Thank you! :)

**Language Arts**

Thank you, but what would be the definition for the adjective?

**Language Arts**

Is obscured a verb, adjective, or both?

**Language Arts**

Thank you! :)

**Language Arts**

What are the other forms of the word, 'reap'. I only found reaps and reaped.

**English**

How many do you need to find? 0r do you just need to find all of them?

**Science**

Thank You!

**Science**

I think it's icecaps & glaciers and lakes & rivers.

**Science**

Which of the following contain water that is easily available for human use? (more than one answer) Icecaps & glaciers - 76% of fresh water Shallow Groundwater- 12% of fresh water Deep Groundwater - 11% of fresh water Lakes & Rivers - 0.34% of fresh water Water Vapor - 0.037% ...

**Language Arts**

What is the pronunciation of unsavory?

**Language Arts**

Does anyone know a website that tells you other forms of a word? Ex. run - ran, running