Monday

November 24, 2014

November 24, 2014

Total # Posts: 36,750

**INTSCIENCE**

true
*November 24, 2014*

**int.science**

true
*November 24, 2014*

**Pre-Calc/Trig**

36^(1/2) *64^(1/3)
*November 24, 2014*

**Chemistry**

divide 100J/C by mass, and you will havespecifice heat capacity
*November 22, 2014*

**Chemistry**

n=PV/Rt solve for n, then molmass=1.92/n now, from mol mass, determine the gas
*November 22, 2014*

**physics**

pressure=weight/area
*November 21, 2014*

**math**

(J-22)*3=(R-10) but J=R originally, so 3R-66=R-10 2R=56 R= ...
*November 19, 2014*

**chemistry**

PV=nRT solve for V. You know the moles n, Pressure (1atm), and t(stp).
*November 19, 2014*

**physics**

if it is a horizontal track vf^2=vi^2+2ad remembering a=Forcefriction/mass
*November 19, 2014*

**Science 7th Grade**

rethink 4,7
*November 19, 2014*

**chemistry**

Energy= Planck's constant* speedlight/wavelength
*November 18, 2014*

**chemistry**

divide the energy by 2*avagrado's number, the number of atoms in a mole of H2 Then, use Planck's equation to find the wavelength.
*November 18, 2014*

**physics**

Zero, it is not accelerating.
*November 18, 2014*

**physics**

zero net force
*November 18, 2014*

**ratio proportions**

4/5=A/(200-A) 800-4A=5A 9A=800 A= 800/9 =89 O= 200-89=111
*November 18, 2014*

**4th grade Math**

4x(300-25)=1200-100
*November 18, 2014*

**juvenile law**

your post does not make sense to me. Can you actually ask a question?
*November 18, 2014*

**physics**

final velocity=a*t
*November 18, 2014*

**Chemistry**

wouldn't the original vinegar be ten times that calculation, or .943M grams per liter: .943=grams/molmass grams=.943*molmass percent? percent=massVinegar/masssolution = massabove/liter*1liter/1.01*1000 in the last, instead of 10ml, I assumed for calculation 1 liter of the ...
*November 18, 2014*

**English**

it says... new ideas are mostly worthless, and most try to pass them to another sucker.
*November 18, 2014*

**IPC**

heat=mass*c*deltaT = 500*1*10=5000 calories
*November 18, 2014*

**Chem 11**

As best I can tell, your work is ok. However, I think you should have gotten closer to CuSO4.5H2O What concerns me is the precision of your masses...only two significant digits. I wish your balance would have given when massing four significant digits instead of three. See ...
*November 18, 2014*

**math**

something is missing, like the cost per lb?
*November 18, 2014*

**algebra**

multiplly the first equation by .5 .5x+y=5 3x-y=9 add the equations 3.5x=14 x=4 now in the first equation use that x and solve for y.
*November 18, 2014*

**math**

15liters/tank*1Cup/.3liters= 50 cups/tank I think Ms Sue multiplied when she mean to divide.
*November 18, 2014*

**government**

In some ways, yes. For instance, who does the IRS work for? Congress makes some crazy vague laws, then the administration "intreprets" them into regulations and forms, and the courts then finally rule on the legalities.
*November 18, 2014*

**math**

What is 7!/5!2! ? Why?
*November 18, 2014*

**US Government**

correct, correct
*November 18, 2014*

**physics**

Hmmmm. There must be something missing
*November 18, 2014*

**physics 9th grade**

Impulse=changemomentum impulse=90*4.5 Nt-sec
*November 18, 2014*

**math**

I will do one...third one. (-y^2 +2) (y^2-3) using the FOIL method (-y^2*y^2 +2*(-3) +2y^2-6) -y^4+2y^2 -6 + 2y^2 -6 and combine the negative sixes, and they y^2 terms.
*November 18, 2014*

**Geometry**

volume is proportinal to radius^3 volumJ/VolumeE= (rj/re)^3=(44,423/3960)^3
*November 18, 2014*

**science**

more information has to be known
*November 18, 2014*

**algebra 1**

what is -4x^2y^(5/3)
*November 18, 2014*

**Cal**

y'=4x^3-24x^2+48x+7 y"=12x^2-48x+48 set y" to zero, and solve for x x^2-4x+4=0 (x-2)^2=0 x=2 y= use original equation to find y.
*November 18, 2014*

**Pls check if I got it correct**

nope. 2,3,4 are all wrong. X is LESS than or equal to 49
*November 18, 2014*

**algebra**

I1=.1(M+2000) I2=.12(M) I1+I2=430=.1M+200+.12M solve for M, then M+2000
*November 17, 2014*

**american constitutional law**

http://www.ourdocuments.gov/doc.php?flash=true&doc=57
*November 17, 2014*

**Alegbra 2**

are you grazing for answers? I will check your work.
*November 17, 2014*

**Alegbra 2**

I will check your work.
*November 17, 2014*

**Alegbra 2**

2x^2+5x-2=0 x=(-5+-sqrt(25-24))/6
*November 17, 2014*

**Alegbra 2**

I will check your work
*November 17, 2014*

**chem**

Look at the balanced equation. for each mole of Mg consumed, two moles of H2 gas are produced. So the question is, how many moles of Mg was used: 21g/atomicmassMg Now, twice that is the moles of H2 gas. Volume? V=nRT/P use the correct R for your units.
*November 17, 2014*

**Physics**

weight=mass*acceleration gpe=m*acceleration*height If he goes to the top, his gpe increases.
*November 17, 2014*

**art**

Yes, of course. Often it was very common objects.
*November 17, 2014*

**Science**

Are you serious? 1/4 is 25 percent. If you are above 7th grade, you need to review what percent means.
*November 17, 2014*

**Science**

Bb x Bb= BB, Bb, Bb, bb Looks like only one bb kid out of four.
*November 17, 2014*

**math**

What is 13,600(1+.045/2)^10 put that in your google search window
*November 17, 2014*

**math**

see other post
*November 17, 2014*

**Values Education**

special= a girl scout can succeed at anything. happy= I feel good when I succeed. Girl Scouts are winners! Girl Scouts are growing to be leaders.
*November 17, 2014*

**maths**

340 would have been the mass, as could have been 260 grams.
*November 17, 2014*

**Thermodynamics**

In my bread oven, I have a clay tile in hte oven above the flame which prevents a hot spot just above the flame. Diffuser is very general term, anything that spreads heat away from a point location is a difuser. An heating duct can be a diffuser. I doubt is anyone has written ...
*November 17, 2014*

**calc**

1, yes 2. a "conservative" vector field is one in which if one goes from point A to point B, the change in potential from A to B does not depend on the path taken. Consider from the top of the Mountain to some point B on the bottom, the change in potential energy ...
*November 17, 2014*

**AP CALC. AB**

Your function is odd, I read it as Cosine ( t-((t^2/2) ) + 10 check that Take the derivative, that is velocity Take the derivative again, and set to zero, solve for t. Put that t into velocity .
*November 16, 2014*

**Chemistry**

.65moles
*November 16, 2014*

**physics**

in a .12*2*PI path, it has rolled once. time= distance/speed= 12*2*PI/.35 s angulur apeed= 2PI/time
*November 16, 2014*

**English**

It depends on style guides. Let me quote from Wiki on hypens.. <A definitive collection of hyphenation rules does not exist; rather, different manuals of style prescribe different guidelines. The rules of style that apply to dashes and hyphens have evolved to support ease ...
*November 16, 2014*

**Mathematics**

1/6;6/8; 3/3
*November 16, 2014*

**Chemistry**

" any other bases" is leading far away from sodum hydroxide. The issue is what is meant by "basic" nature. receiving electrons? neutralizing acids?
*November 16, 2014*

**Physics**

Wondering what the empty tanker weights? olive oil mass=200kg olive oil volume= 200kg/densityOO water displaced volume= 200kg/densityWT volume=height*area height=200kg/(densityWT*.9) height=200/1040*.9= you do it. This is the depth of water needed to hold 200kg floating
*November 16, 2014*

**English**

common nouns: person, place, thing. emotion is a thing (state of mind, as mad, joyful, etc) Hint: Kindle should be capitalized
*November 15, 2014*

**Algebra 1 Check My Answer Please.**

nope, nope, nope
*November 15, 2014*

**Algebra 1**

and you thinking is?
*November 15, 2014*

**math**

V=24*10/24*9/3
*November 15, 2014*

**Calculus**

perimeter of new squares sum=x so one length is 9/10 x, the other x Then area sum= (.9x/4)^2+(.1x/4)^2 = 1/16( .81x^2+.01x^2) =1/16( .82x^2)
*November 15, 2014*

**calculus**

profit=n(x-8) Profit= 3/(x-8)+5(100-x) * (x-8) = 3+5(100-x)(x-8) dProfit/dx=0= 500 (x-8)+5(100-x) 0=500x-5x-4000+500 check that. x= 3500/495 check all that, I did it in my head.
*November 15, 2014*

**Physics**

You cannot get a negative number from the above. m=(-350*4.18)/(.386*(-489)) I get almost 8 grams. Work it out.
*November 15, 2014*

**Physics**

Obviously wrong. you specific heats should be in J/g Oops..I eerred. should be... m*Ccu(31-520)+350*Cwater*(31-18)=0 look up the specific heat of water, and copper, and solve for mass m.
*November 15, 2014*

**Physics**

heat added to copper+heat added to water=0 m*Ccu(31)+350*Cwater*(31-18)=0 look up the specific heat of water, and copper, and solve for mass m.
*November 15, 2014*

**Maths**

nearest whole number is 67
*November 15, 2014*

**Question**

Taking one step at a time is a behavior objective for large motor skills. Or clapping hands.
*November 15, 2014*

**Chemistry**

PV=nRT n=96/molmass * PV/RT solve for molmass
*November 15, 2014*

**Question**

I dont know. Is this in some context?
*November 15, 2014*

**chemistry**

Heat=mass*Hv + mass*cwater*(70)
*November 15, 2014*

**science**

what is mass*g*height?
*November 15, 2014*

**Liberal Arts 1**

Joint probablility. Pr=(39/50)-(3/39)
*November 15, 2014*

**chemistry**

vapor pressure is related to mole fraction moles sucrose=massSucrose/342 moles water=450/18 total moles add them 745/760=molessucrose/total moles solve for massSucrose
*November 15, 2014*

**phsics**

see this figure: http://tuhsphysics.ttsd.k12.or.us/Tutorial/NewIBPS/PS9/9-63.JPG when the ladder slips, friction Fv*mu is just equal to the force horizontal. Now sketch the figure on paper, 1) sum the moments about the base and set to zero. 2) sum horizontal forces and set to ...
*November 15, 2014*

**Physics**

You have to know the frequency.
*November 15, 2014*

**Physics**

absolutely several thousand off.
*November 15, 2014*

**Physics**

haat added to brass+heat added to water=0 150*cbrass*(28-Ti)+400*cwater*(28-27.7)=0 solve for Ti
*November 15, 2014*

**chemistry**

heat added to ice+heat added to water=0 124*Hf+124*cwater(Tf-0)+1360*cwater*(Tf-90)=0 solve for Tf
*November 15, 2014*

**chemistry**

disregard last line delta H= heatfor ice melting*molmass/.203
*November 15, 2014*

**chemistry**

heat for ice melting=254*Hf Hf=above*molmassZn/.203
*November 15, 2014*

**physics**

first, pretend it does not get to the melting point. 8700J=50*specificheat*(tf-22) 8700=50*.160*(Tf-22) Tf-22= 1087 so it melted... OK, figure how much eat it took to raised it to melting point. Q=50*.160*(621-22) I get about 4300 J (you check that) so you have left44ooJ Now ...
*November 15, 2014*

**Inflation Exam**

FV=4,725,000/(1+i)^4 whatever i rate you have in the tables. for instance, say i= 2Percent FV=( )(1.02)^4== 4365169.64
*November 15, 2014*

**Chemistry**

heat to melt the ice=Hf*500=you do it. Heat left over=heat to heat water= 500*c*(Tf) solve for Tf
*November 15, 2014*

**physics**

v=distance/time=5/5= 1m/s
*November 15, 2014*

**Physics**

How must the wave be changed? Do you meant tension be changed? f=sqrt(tension) 750/650 = sqrt(T) T=1.331 so the tension must be increased 33 percent.
*November 14, 2014*

**physics**

yes, that is it
*November 14, 2014*

**Physics**

ooops, J/KgC
*November 14, 2014*

**Physics**

heat=m*c*dT c= 200j/*2kg60C)= 200/(120) J/gC
*November 14, 2014*

**physics**

dTemp= q/mc= 135.2J/(0.02475Kg*140J/kgC
*November 14, 2014*

**Physics**

your answer is worthless without units. heat=Hf*mass Hf= heat/mass= 100j/2kg= 50 j/kg
*November 14, 2014*

**physics**

what is (6400/(6400+h))^2=1/16 or 6400/(6400+h)=1/4 or h= 3*6400 km
*November 14, 2014*

**Math**

pr(one tail)=1-pr(all heads)=1-(1/2)^4
*November 14, 2014*

**Math**

Did it occur to you to find theta first? Theta=arcsin8/17 =0.489957326 rad in the first quadrant, or in the second quadrant, PI- 0.489957326 rad= 2.65163533rad Put each of these in your google search windown: sin(2* 2.65163533) cos(2*2.6516) etc
*November 14, 2014*

**Algebra**

Put in x in one of the points, and see what the y computes to be.
*November 14, 2014*

**chemistry**

GOOGLE VSEPR SO2
*November 14, 2014*

**Physics**

force friction=forcecentripetal mg*mu=m v^2/r v= sqrt (mu*R*g)
*November 14, 2014*

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