Monday
November 24, 2014

Posts by bobpursley


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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