Thursday

December 18, 2014

December 18, 2014

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*

**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*

Pages: **1** | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>