Thursday
December 18, 2014

Posts by bobpursley


Total # Posts: 37,009

Physic
E=k*3/.01^2 - k*2/.01^2= k/.01^2=100k Nt/coulomb
December 16, 2014

Physic
V=kq/.1 b. E=kq/.1^2
December 16, 2014

Physic
potentials are scalar, so you can addthem V=0=40E6/x-60E6/(.5-x) solve for x
December 16, 2014

Policing
C is the most accurate.
December 15, 2014

chemistry(solutions)
what is 13.2/264?
December 15, 2014

Math
it is about 5x1/3 which is about 1 2/3
December 15, 2014

Physics
I will be happy to look at your work.
December 15, 2014

history
I agree
December 15, 2014

7th grade math
go to the head of the class, all correct.
December 14, 2014

P.E. help
correct
December 14, 2014

Science Help!!!!
D.
December 14, 2014

physics
work= force*distance=400cosine15*300
December 14, 2014

Calculus
rel minimum. f' is zero, and the curve is going up (f")
December 14, 2014

phisics
work=57.6 cos25.3*2.71
December 14, 2014

physics
TanTheta=mu*g
December 14, 2014

Calculus
draw the triangle vertical distance horizontal distance= sqrt(x^2-1) hypotenuse= x given dx/dt=1m/s what is d(sqrt(x^2-1))/dt d(hyp)/dt=1/2 * 1/sqrt(x^2-1) * 2xdx/dt so when sqrt(x^2-1)=8, how fast then 1/2 (1/8)*2(sqrt(64+1)*1 = sqrt(65)/8 m/s check my work.
December 14, 2014

Calculus
draw a triangle vertexs:runner, secondbase, firstbase a) x= distance to second base frm runner 90 ft = distance second to first l= distance frm runner to first base so l^2+90^2=x^2 and given dl/dt=24ft/sec 2l dl/dt+0=2xdx/dt solve for dx/dt when l=45 you will have to ...
December 14, 2014

Math
z^3, not x^3 on the z term, I get -24z+30z=6z
December 14, 2014

physics
final energy in spring+gain of PE=0 springenergy-mgy=0 solve for spring energy
December 14, 2014

Calculus
see other post
December 14, 2014

grade 10 physics
see other post
December 13, 2014

Physics grade 10
KE=1/2 m v^2 what is mass?
December 13, 2014

Chemistry
figure the moles of Ba(OH)2 (note formula) in 23.7grams molesBa(OH)2= 23.7/formulamassBa(OH)2 I get about 0.14 moles then consider the balanced equation: Ba(OH)2 + H2SO4 >>> 2H2O + BaSO4 so you need the same amount of moles of sulfuric acid. Molarityacid=molesacid/...
December 13, 2014

physics
One wonders what the frequency being sounded was.
December 13, 2014

Algebra 2
36(x-1)+2x^2(x-1)=0 (36+2x^2)(x-1)=0 x= +- sqrt18, or x=1
December 11, 2014

Algebra 2
5x^3=40 x^3=8 x= 2
December 11, 2014

Algebra 2
let z^2=z 4z^2-13z +9=0 (4z -9)(z-1)=0 z= 9/4 z= 1 x^2=9/4 x^2=1 x= +- 3/2 x= +-1 four solutions
December 11, 2014

Math
on your equation do it this way: futurevale= origianl valeu(1+i)^t take the log of each side log(future value)= log(valueorig)+ tlog(1+i) then, solve for log(i+i), then, take the antilog and you end with something like this 1+i=10^z where z was what you found log(1+i) was ...
December 11, 2014

Chemistry
calculate the moles of Ferric Chloride molality=molesFeCl3/.176 freezing point= 0 - m*1.86 boiling point= 100+m*0.51
December 11, 2014

Math
amplitude=2.5cos(2PI*t/5)+2.5 On your answer, it will go below zero when cosine is negative.
December 11, 2014

mazin
Load current=1.5 amp load terminal voltage= 40*1.5=60volts. voltage drop per battery: .2*1.5=.30 volta 60volts=(1.5-.3)n n= 50 batteries.
December 11, 2014

Estimating sums and differnces of fractions
you are an answer mooching fraud. You were Mrs Johns five minutes ago. Get out of here.
December 10, 2014

Science
between B and C
December 10, 2014

Physics
R= rho*length /area
December 10, 2014

Physics
spring energy= change gravational PE 1/2 k x^2 = mgh solve for h.
December 10, 2014

Chemistry
SeBr4 molecules is .923 * avagrodo's number number of atoms= 5*.923*avag number
December 10, 2014

Math
Nearest 1/2? on the first, 4/5 will round to either 2.5/5 or 5/5 :(those are the 1/2 of five). 4/5 is closer to 5/5 than 2.5/5, so 3 4/5 to the nearest 1/2 is 4 100 1/3. you have to round to 1.5/3, or 3/3. 1/3 is closer to 1.5/3, so 100 1/3 rounds to 100 1.5/3, which is 100 1/...
December 10, 2014

pharmaceutical technology
w/W=16/100
December 10, 2014

Math
T-17=M
December 10, 2014

science
What is a 3km object? Obviously, a very long object. work= FORCE*distance If you meant to say an object is moved 3km, then force=work/distance=51kj/3km=17Newtons
December 10, 2014

Writing
I agree. If the President came to your class, you would not introduce him until you knew why he was there, and what he had to say. It is the same with a paper or essay. Know what it says, before you introduce it. YOu dont write the introduction, then start writing, it might go...
December 10, 2014

Sociology
well, it takes some brains and skill to remain childless, so I bet high levels of education and income.
December 10, 2014

Computer science
Have you considered reading a book on this? Search Amazon, or your local bookstore.
December 10, 2014

music history
https://www.youtube.com/watch?v=zrW_Gtekmn0
December 10, 2014

music history
http://doridro.net/download/Deshattobodhok/Rokto%20Lal/Mago%20Bhabna%20Keno.mp3.html
December 10, 2014

moral science
I am wondering what immoral science is called?
December 10, 2014

algebra 1
markup price=27*1.75 customer purchased = 27*1.75*.60
December 9, 2014

Math
what is 4/8 feet?
December 9, 2014

Physics
it is one hz off, low. 439hz. I have never heard of a person who can detect lower than 20 hz. In fact, most physics books actually say the range of hearing starts at 20hz.
December 9, 2014

general chemistry
I just did this. Did you understand my picture,and equation? Have you ever thought that machine are not perfect? Look at the picture link...
December 9, 2014

Calculus angle of elevation
You have to have the height the man's eyes are frm the floor to do this. angle of observation= arctan(eye-5)/d where distance d is the horizontal distance. eye = height of eyes off floor. you are given d'=3ft/sec theta= arctan(eye-5/d) 4ye-5=d*tanTheta take the ...
December 9, 2014

Math
time going=d/8 time back=d/6 7=d/8+d/6 solve for d first. multiply both sides by 24 24*7=3d+4d 24=d now go back to first equations, solve for times.
December 9, 2014

physics
http://formulas.tutorvista.com/physics/doppler-shift-formula.html
December 9, 2014

general chemistry
you have to think on a side. http://www.chemteam.info/Liquids&Solids/fcc-face-view1.gif Looks like to me four r radius= 1 diagonal 4r=sqrt2* 362pm solve for r.
December 9, 2014

Science/Math
it rises because of displacement. stick your finger in a cup of tea, the water level rises. Same reason.
December 9, 2014

Science/Math
It will rise to new volume 6.1ml more than before the stopper were submerged.
December 9, 2014

general chemistry
it releases heat when it condenses. a. calculate the moles in 50g. moles= 50/molmass calculate the molmass of methanol. b. heat= moles*(-Hevap)
December 9, 2014

algebra
n=2q N*.05+15.30+.25q=74.80 2q(.05) +15.30+.25q=74.80 solve for number of qurters, q.
December 9, 2014

Abnormal Psychology
Mr B reminds me of many drunks I have known.
December 9, 2014

chemistry
from what? Solid NaOH, from a known stock solution? Assuming solid NaOH pellets. determine the mass needed mass=.250*.076*40 (40 is the formula mass of NaOH) accurately measure the mass needed. put 240 ml of distilled H20 in an Erlenmeyer flask, add the solid NaOH. Put the ...
December 9, 2014

chemistry
It takes heat to do this reduction reaction, ie, it absorbs heat, so the sign of deltaH is ....
December 9, 2014

Algebra 2
hf=ho+vi*t-g/2 * t^2 0=5+30t-4.9t^2 solve the quadratic with the quadratic equation.
December 9, 2014

physics
did I miss the question?
December 9, 2014

Can you help me with this math problem? ASAP plz!
derpy, you need to stop mooching answers. Show some work.
December 9, 2014

Math
Hmmmm -9x-45-10-x=35 -10x=90 x=-9 check that.
December 9, 2014

physics
distance=velocity*time .48m=v*.505s solve for v
December 9, 2014

Physics
Ok, the change in KE goes to PE 1/2 m (8.2^2-7.3^2)=mgh solve for h.
December 9, 2014

chem
Grahams law, difusion rate is proportional to inverse sqrt of mass. let the fastest rate be RATE relative rate of second is RATE(sqrt(36/38)= .973 RATE relative rate of last is Rate(sqrt(36/40)=.949Rate
December 9, 2014

Pre-Algebra can you please help?!
Opps, it is wrong. This said simple interest, not compounded. try totalINTEREST= 400( .045)x3 + 450(.032)x3
December 9, 2014

Pre-Algebra can you please help?!
what is totalINTEREST= 400( 1.045)^3 + 450( 1.032)^3 -400-450 put this in your google search window 400( 1.045)^3 + 450( 1.032)^3 - 850=
December 9, 2014

Psychology
my guess is c, but I can't find any research on it.
December 9, 2014

science
moles of H2O in 9.2 grams: moles=9.2/18=you do it. Moles of H2 in one mole of H2O: one so you get 9.2/18 moles of H2. That is 9.2/18 * 2 grams.
December 9, 2014

mechanics (plz help..)
I dont follow the statement. How can what the man does, change the path of the rain? What if the man stops? or goes inside? Or, or you moving the vertical frame of reference?
December 9, 2014

Sociology
race and ethnicity
December 9, 2014

Math
1 8/9 - days*1/6= amount left days=7
December 9, 2014

algebra2
m= minutes over allowed billedamount=65+.1m
December 9, 2014

Algebra 2 semester2
N*.05+D*.1=5.60 N+8=3D (3D-8).05+ .1D=5.60 solve for D first.
December 9, 2014

Chemistry
it is equal and opposite.
December 9, 2014

physics
What is the length of a wave mean? if you mean distance between peaks...that is wavelength, but 6cm?
December 9, 2014

physics
k=mg/.05 N/m xnew=newForce/k
December 9, 2014

Pre Algebra
correct.
December 9, 2014

physics
first, the lifting force: 119N*sin30 now the normal force= mg-119*sin30 now the friction: mu* (mg-119Sin30) pulling force: 119Cos30 net force=mass*acceleration pullingforce-friction=mass(a) solve for acceleration a. Finally, Vf^2=Vi^2+2ad solve for Vf
December 9, 2014

physics
see other post.
December 9, 2014

math
G=B+13 g=22+13=?
December 8, 2014

Math
what is 12:1 ?
December 8, 2014

Math
L= 2*rows. R=3*rows= 90 given so rows= 30 all seats= 5*rows=150
December 8, 2014

physics
hour hand goes 2/12 * 2PI radians minute hand= 120*2PI second= minute displacement*60 check my thinking.
December 8, 2014

science
did I miss the question here?
December 8, 2014

Science
18
December 8, 2014

Math
His biggest mistake was sleeping in 4th grade math class. The second mistakes is he added denominators, only numerators add.
December 8, 2014

Biology
Do you care about saving the world? Or care about understanding the world around you? Or the impact on the world when you do something outside?
December 8, 2014

algebra
No on the first, l/w=2, on the second, it is NOT 2
December 8, 2014

Math
108/18=6, so increase each by x6 pinapple: 24 cups orange: 48 cups..
December 8, 2014

math- weighted averages
500*.6 + V*.3= .5(500+V) solve for V
December 8, 2014

Physics
first figure the angles the verticalmakes with the cables. Left=49 right:48 Sum of vertical forces is zero. 690-L*cos49 -R*cos48=0 put that into the form a*L + b*R=c then second equation: sum horizontal forces is zero. L*sin49-R*sin48=0 so you have two equations, two unknowns...
December 8, 2014

us hist help!!!!
I am wonder what the other choices are.
December 8, 2014

language arts
yes, she married for practical reasons...
December 8, 2014

Trig
sec^2= 1/cos^2, and -tan^2= -sin^2/cos^2 so on the left.. (-sin^2 +1)/cos^2= (cos^2)/cos^2= 1
December 8, 2014

chemistry
Looks like z=2 looks like A= 212-208 X looks an alpha particle.
December 8, 2014

Phsyics
k= weight/distance= 3*9.8/.15 N/m
December 8, 2014

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