Wednesday
February 22, 2017

Posts by bobpursley

Total # Posts: 43,784

social science
Where is Namibia?
February 22, 2017

biology
1E-9 x 1E-7= 1E-16
February 22, 2017

english
incisive: sharp, cutting
February 22, 2017

Science
http://learn.leighcotnoir.com/artspeak/elements-color/primary-colors/
February 22, 2017

Chemistry
mass=.238*1*molmassFeCl3
February 22, 2017

Social Studies
Correct. He was not a friend to citizens of the South.
February 22, 2017

science
molesNH3=70/(14+3) massN2= 28*molesN2=28*1/2*70/17 Remember Nitrogen is N2
February 21, 2017

Math
p(>30)=.3^2=.09
February 21, 2017

Math/velocity
velocity=p'=4cost at t=0, v=4 at t=PI/2, v=0 at t=PI, -4
February 21, 2017

chemistry
from the balanced equation, it is a one mole cO2 per one mole methane. molesmethane=100/16 gramsCO2=100/16 * 44 g
February 21, 2017

chemistry
Diiodozinc I2Zn products...>>>> BaI2 + Zn(OH)2 Notice Zn++ does not change valence, nor does I- zinc hydroxide will form a precipate. Net ionic 2(OH)- + Zn++ >>> Zn(OH)2
February 21, 2017

Chemistry
a. determine moles of acid 75*.175/98 Heq*molesacid=Heqbase*Molaritybase*.215 3*75*.175/98=2*M*.215 solve for molarity of the base.
February 21, 2017

Science
Hmmmm CH4+O2>>CO2 +H20 CH4+2O2>>CO2+2H2O is that balanced?
February 21, 2017

Chemistry
Nope, it is not linear, it is a curve whose slope decreases. AT zero, that means the initial slope. your first slope is .009/20=.00045mmoles/s or 4.5E-7moles/sec. At the end, between 160-180 sec rate=.003/20=.00015E-3=1.5E-7Mol/sec The other way, to get initial slope, is to ...
February 21, 2017

calculus
a. 1/q=1/f-1/p 1/g= (p+f)/pf q= pf/(p+f) dq/dp= f/(p+f)-pf/(p+f)^2 (remember f is a constant, so df/dp=0) check that.
February 20, 2017

Chemistry
5.42 grams H2=2.71 moles YOu need 1/3 of that of N2 moles N2=1/3*2.71=.89 grams N2=.89*28= way more than the 5.42 grams you have, so N2 is the limiting reageant.
February 20, 2017

Chemistry
This reaction requires twice the moles of CO as O2. MolesO2=10.7/32 molesCO=2x above gramsCO=2*10.7/32*molmassCO and the mole mass of CO is 28
February 20, 2017

physiology
if 600 ml of water, then mass of solution is 600g+massGlucose but .13(600+massGlucose)=massglucose 600=massglucose/.13-massglucose massglucose(1/.13 -1)=600 massglucose(.87/.13)=600 massgluxose=.13*600/.87
February 20, 2017

Teacher Aide / Language and other Barriers
C. http://www.rock.k12.nc.us/cms/lib6/NC01000985/Centricity/Domain/1888/What%20beginning%20teachers%20need%20to%20know%20about%20LEP%20and%20ESL.pdf
February 20, 2017

calculus
velocity(0)=1 velocity(2)=1/9 m/s No, and No to your answers.
February 20, 2017

Science
WORK IS THE SAME. WORK=MASS*G*HEIGHT POWER IS LESS ON THE SLOW LIFT POWER=WORK/TIME
February 20, 2017

Chemistry
density=45g/15ml=3g/ml
February 20, 2017

Physics
Are you calculus based? If so, you know the field contributions in the direction perpendicular to the plane increases as the angle from far charges increases (due to the angle), that increases as the field from the close particles decreases.
February 20, 2017

chem
aND?
February 20, 2017

math 1
nope, putting in 5,2 in to the first equation is not - 2 Substitution first equation: y=2-4x into second: -2x-3(2-4x)=1 -2x+12x-6=1 10x=7 x= 7/10 then y=2-4*7/10=2-2.8= -0.8 check that.
February 20, 2017

physics1
magnitude? Easy, they are at right triangles. magnitude=sqrt(23*125)^2 + (12*255)^2 ) angle W of S is arctan((W/S) or arctan ((23*125)^2/(12*255)^2 )
February 20, 2017

Physics
e is the best answer, if you ignore d is worded poorly, distance is dependent on the height and the initial horizontal velocity. So technically, d and e are both not true. I am not certain if your teacher is playing games or not with the wording on d, but distance does depend ...
February 20, 2017

Math
what is 23/4....5.6 so i count six students carrying four or less books.
February 20, 2017

English
You need to put it in context with what is before and around, and what follows. Folks all around the world have suffered oppression, violence, hunger usually caused by countries ran for the profit of few, and the words are inviting the victims to come to a refuge away from all...
February 20, 2017

math
and how high is the building? h/30= tanTheta solve for h.
February 20, 2017

Science
Mercury II? that is two electrons per atom. charge=current*time=2C/sec*2*3600sec. number electrons=charge*1/e now it takes two electrons /atom number atoms=numberelectrons/2 moles Hg= avag number/number atoms
February 20, 2017

Math
I assume you are not a Calculus student... rate water=water/minute = pool/40min+pool/60min - pool/80min =pool(1/40+1/60-1/80) = pool (60+40-30)/2400=pool*(7/240) now to fill the pool is the inverse of this rate, or 240/7 min= about 34 min
February 20, 2017

Chemistry
324kj=50kg(Cwater)(Tf-22.2) look up Cwater, check units (you want it in kj/kg), then solve for Tf
February 20, 2017

Physics
hf=0=hi+vi*t-1/2 g t^2 you are given vi, and time t. solve for initial height hi hf=hi+2.2*4.8 use hi form above, solve for hf the final height of the balloon at time of stone crash.
February 20, 2017

science
time in air: hf=hi-1/2 g t^2 0=.75-4.9 t^2 solve for t then, in the horizontal 20=vi*t solve for vi
February 20, 2017

Chemistry
YOu need 8/3 moles of nitric acid for each mole of copper so how many moles of copper? 15g/63.5=.236 so we need 8/3 * .236 of nitric acid, and we have....much more than that, so the reaction is controlled by the mass of Copper. Now, finally, moles of NO: we get 2/3 mole of NO ...
February 20, 2017

Production and Operation management...Pls Help me
I am not about to do this, I have read Masters thesis on this (including my brother's). What you have to balance in production is ...performance standards, cost, and schedule. Those three things interact in complex ways, that depend on the particular product. Performance ...
February 20, 2017

Thermal physics
You have to be kidding. The only thing you didn't include was to do in three short paragraphs. You can start here: https://www.boundless.com/chemistry/textbooks/boundless-chemistry-textbook/thermodynamics-17/the-laws-of-thermodynamics-123/the-three-laws-of-thermodynamics-...
February 20, 2017

biology
time=6E6 pairs/(1000n/sec*2pair/n) = 3000seconds (check that math) http://book.bionumbers.org/how-long-does-it-take-cells-to-copy-their-genomes/
February 20, 2017

Chemistry
assume 1000g of solution so 301 grams of it is formic acid, and 699 grams of water. moles of water=699/18= ... moles of formic acid=301/molmass=.. mole fraction=molesacid/totalmoles molality= molesacid/.699
February 19, 2017

Physics
What is 1/2 mv^2 m in kilograms, or 2.37grams or .00237 kg v=velocity in m/s=85miles/hr*1hr/3600sec * 1609m/mile = 37.9984 m/s ke= 1/2 m v^2
February 19, 2017

CHEMISTRY
mass gas=20+81-92.80 reason: conservation of mass, initial mass=finalmass+massgas
February 19, 2017

Penn foster
I use dehydrated egg whites. No fat, no chloesterol.
February 18, 2017

Maths/Algebra
1/2 S=T 1/3 S=scarf so, S-1/2S-1/3 s=15 S(1-1/2-1/3)=15 S(6-3-2)/6=15 S(1)=90 goodness, she blew that 90 dollars away. 45 dollars on a T? 30 dollars on a Scarf?
February 18, 2017

Finance
4/360 * 9.75Million= ...
February 18, 2017

PHYSICS
gpe depends on the sine of the angle times height Graphing linearlily? GPE=mgh=mg*distance*sinTheta for a given distance on a ramp, you can plot it this way: y axis: GPE, and height x axis: distance. Now, for the given ramp distance, draw a circle about the origin, of radius r...
February 18, 2017

Laws of Physics
energy used: mgh=68*3 that assumes it stops at the top (ie has not gained KEnergy). workin=energyused/.6 energylost in machine=workin*.4
February 18, 2017

physics
145lbs*1kg/2.2lbs=xxxxkg,figure that out. power=work/time=massinKg*9.8N/kg*4.8m /5.5sec in joules...
February 18, 2017

Chem
What is #moles*Avagrodo's Number ?
February 17, 2017

Esol
He was elected...
February 17, 2017

science
figure time time=73.3m/1.22m/s+73.2/2.80=86.2sec avgvelocity=distance/time=146.4/86.2=1.70m/s
February 17, 2017

Global/World Ancient History
Ancient Greeks believed gods and goddesses controlled nature and guided their lives. They built monuments, buildings, and statues to honor them. Stories of the gods and goddesses and their adventures were told in myths. The Greeks did not believe that gods and goddesses were ...
February 16, 2017

Chemisty
The new molarity is 200/275 of what she intended.
February 16, 2017

electrostatics
Coulombs law applies: F=kqq/d^2 solve for d
February 16, 2017

chemistry
The question makes no sense to me.
February 16, 2017

Physics
moembntum is conserved. 62*.50+3200*V=0 V= - 31/3200 m/s the negative sign means to the right. So if you are looking for the velocity of the spacecraft, it is .0096m/s to the right. I have no idea why you put kg.
February 16, 2017

math
yes. rearrangeing that equation to y=3x+4 same interecept y=10x+4 and it has one solution. the solution to these two equations is (0,4), where the two lines cross.
February 16, 2017

Math
In your trig repertoire , you should know the 3 basic trig values of angles 0°, 30°, 45°, 60°, 90° by knowing the ratio of sides of the 30-60-90 and the 45-45-90 degree triangles. ..Make some flash cards, and memorize these NOW. Or, you can be a dead duck ...
February 16, 2017

Physics
84-20=64 smallest 84+20=104 largest
February 16, 2017

physics
distance: 22+22+7.5cm displacement: -7.5cm
February 16, 2017

Political Science
I assume sitting Federal Judges would not be so stupid to directly lie under oath, since extramarital affairs are state offenses, and in most states, that is illegal, the judge could plead the 5th if he could be charged by that state (of residence, or visiting) http://www....
February 16, 2017

Chemistry
from the equation, you get the 3/2 moles of nitrogen as you had of sodium azide. MolesN2=65g/molmassNaN3 then volume N2, get from PV=nRT
February 16, 2017

Physics
mgh=1/2 mv^2 v=sqrt(2gh)=sqrt(2*9.8*125) that agrees with your answer
February 16, 2017

Math
speed uphill=120/2=60 speed level=3/2 * uphill=90 speed downhill=120 on flat land, d=45=90*t t=1/2 hr
February 16, 2017

Physics
Isn't there a standard formula for doppler , stationary listner, moving source? Source moving towards observer: f'=fo(vwave/(vwave-Vs) and you are looking to compute vs
February 16, 2017

Help MATH
y=-5/3 * x
February 16, 2017

Math
A*4+C*2=30 A+C=9 double the second equation 2A+2C=18, now subtract from eq 1 4A-2A=12 A=6 C=3
February 16, 2017

Aa pd
If I bout 10 tickets, and 9 mo, how much did I pa? This question makes no sense.
February 16, 2017

Technical writing
I read the semi-solon as a separator for two answers. If that is true, I agree D. I often wonder what "more patient" means. How does one know that? I have been waiting for the Powerball lottery to come in now for 17 years, should I be more patient?
February 16, 2017

Physics
first, I would draw a ray diagram (to be used later). Then, do the formulas you already know for each lens, and on the second lens, you will have to calculate the fo from the first image.
February 16, 2017

Technical writing
I disagree with MsSue on this one, knowing full well she is almost always correct << A run-on is a sentence in which two or more independent clauses (i.e complete sentences) are joined without an appropriate punctuation or conjunction. For example: It is nearly half past...
February 16, 2017

physics
friction up plain: mu*mg*cosTheta gravity down plane: mg*SinTheta netforcedown=Mass* acceleration gravity down-frictionup=m*a solve for a.
February 16, 2017

Science
Nope, of course not. http://astrosun2.astro.cornell.edu/academics/courses/astro201/hr_diagram.htm
February 16, 2017

Physics (Magnetism)
The magnetic field if aligned to the same direction as electron velocity, no force is on the electron, regardless of strength.
February 16, 2017

Physics
walk W for 12cosine(25), then S for 12*Sin(25)
February 16, 2017

Algebra
d=krs^2/t where k=4 d=4rs^2/t
February 16, 2017

Math
you can do a ratio: miles/1gallon=93.5/4.25gallons
February 16, 2017

Physics
up the 18kg in 4mtr per 15 second .. what is mtr? What does up the mean?
February 16, 2017

science
a line of constant pressure.
February 16, 2017

SCIENCE
This makes no sense to me.
February 16, 2017

Physics-Energy
After looking, what is missing is format. On my screen, it is not presented as a table. I am not certain what h is, height obviously. Guessing what this is, is a set of three tracks that have a hill in three locations each, and you are measureing height of hill and velocity at...
February 15, 2017

Physics-Energy
something is missing here.
February 15, 2017

Physics - Electric force, field, and potential
it is zero. Think..you have two positive charges equidistant on opposite sides...
February 15, 2017

Physics
Total area? each tire, or both? I am assuming both. Weight=55*9.8N=areacontact*Pressure pressure=55*9.8/.0022m^2 pressure will be in Pascals.
February 15, 2017

biology
it is a polar covalent bond.
February 15, 2017

too-hard probability sir damon/reiny/steve help
I honestly dont know what you are working to. It seems to me you are looking for 2blacks, 1 white out of 9 balls. you can do that bbw wbb bwb three ways. Pr(2black,1w given 1W)=3*4/9*3/8*5/7 =12*15*1/(9*8*7)=4*5/8*7 = 3/14 check my math, I did it in my head. Honestly, I am not...
February 15, 2017

Physics
Hmmm. You put it in water, submerge it, and it weighs more? That means the bouyance force is negative, sucking the cube down. Most unusual
February 15, 2017

Chemistry
Properly written? Looks not so "proper" to me. Technically, it should have states of the compounds, otherwise, it is ok
February 15, 2017

Math
something is missing.
February 15, 2017

4th grade math
correct
February 15, 2017

Social Studies please help!!!
Question 1) The question was < Muslim turks influence turkey's development?>. I don't see that you addressed that at all. Question 2) Only the last sentence addresses the question. I think I would do more comparison to fairly answer the question.
February 15, 2017

lassen
We are not going to do your homework for you. It appears you are answer grazing. If you have some difficulty understanding how to do a problem, state the difficulty you are having, We are her to help students, not give answers to answer grazers.
February 15, 2017

chemistry
balance the equation Mg+2HCl>>>MgCl2 + H2 so one gets the same number of moles of H2 as moles one used of Mg. MolesMg=.12/atomicmassMg volumeH2=molesH2*RTPmolarvolume
February 15, 2017

Physics
M=-fo/fe Why Do You Type With All Words Capitalized? It Is Disconcerting To The Reader.
February 15, 2017

Physics
see other post
February 15, 2017

Math
Nope on a,c. 2/3 of 2/7=4/21 5/9 of 1.5=5/9 * 3/2=15/18=5/6 of means times. Numerator times numerator divided by denominator times denominator
February 15, 2017

Science
vf^2=vi^2+2ad but a=netforce/mass 35^2=25^2+2*(Fgenerated-Friction)*d/mass friction=800N, d=500m solve for Fgenerated.
February 15, 2017

Science
force*time=changemomentum Because the force is a vector, we how shift to vectors. In the direction normal to the plate: forceN*time=mass*(Vnf-Vni) forceN=.020 (350sin30-(-320sin30))/.01 solve that, that is the average force normal to the plate, in the direction up from the ...
February 15, 2017

Philosophy
And, what are your answers? Or do you want us to do the test for you?
February 14, 2017

Physical Science
correct, unless the button was on the step, and he stepped on it.
February 14, 2017

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