Wednesday
March 4, 2015

Posts by bobpursley


Total # Posts: 37,585

math
25 square feet.
March 4, 2015

Contemporary Child Day Care
romoting child development through parental training, among other factors, promotes excellent rates of child development-.[3] Parents play a large role in a child's life, socialization, and development. Having multiple parents can add stability to the child's life and ...
March 4, 2015

Algebra
Looks ok to me, that is the average hourly rate. Peraps the teacher is looking for the daily average rate of pay. first day=15/3=5 dollars/hr second day=45/8=5.5.63/hr avg daily rate: add them, divide by two.
March 4, 2015

Algebra
-6x = 75 x = - 75/6
March 4, 2015

Algebra
I4 has no slope. Hmmmm. That is imposible. The slope can go from negative infinity to positive infinity, inclucing a slope of zero. Now if you mean zero slope, then y= any number, it will be parallel to I4. Now when y=-3 is on the line, as given, the line is y= -3. You are ...
March 4, 2015

calculus
y=a^kx y'= k*a^(kx)*ln(a)
March 4, 2015

math
Try g(x)=x^2-2x+3
March 4, 2015

geography
Do we know where the middle is? We have not been able to see the edges yet. Whereever the middle is, we are accelerating away from it very rapidly.
March 4, 2015

physics
Is there a question here?
March 4, 2015

math
I am not certain what you mean by an area of 150+175t. 25*W=area solve for W.
March 3, 2015

math
And the question is?
March 3, 2015

Chemistry
Correct
March 3, 2015

Math
substution: y=2+2/3 x 2x-3(2+2/3 x)=6 2x-6-2x=6 no solution. graphing y=2+2/3 x one line y=2/3 x-6 second line. graph them, the lines are parallel, no solution
March 3, 2015

math
How many pieces? 3/4 is the same as 6/8 so there must be 6 pieces that are one eighth foot long, at least here in Texas.
March 3, 2015

Statistics
let me quote from a readable text: <<State the hypotheses. We begin by stating the value of a population mean in a null hypothesis, which we presume is true. For the children watching TV example, we state the null hypothesis that children in the United States watch an ...
March 3, 2015

islamic studies
Isn't this a matter of opinion? I see on cable TV lots of folks each night who seem to know the mind of God, and how to become pure of heart.
March 3, 2015

physics
what is 820 (25.9/9.8)?
March 3, 2015

Calculus, HELP!!!!!!!!!
Ok, I am lost without a picture.
March 3, 2015

Physics
first, you are adding to the normal force pushing downward. normal force=45SinTheta+mg
March 3, 2015

Chemistry
moles acid=moles base M*35ml=1.5*45ml M=? Your work makes no sense. You are supposed to be finding Molarity sodium ions
March 3, 2015

physics
Vf^2=Vi^2 +2ad so the question is, what is Vi? consider vf=vi+at Now you have two equations, two unknowns, Vf, and Vi. I would solve for Vi in the second equation, then put that in the first equation and solve for Vf
March 3, 2015

algebra
this is -+ one stad deviantion. 68 percent sare within one standard deviation.
March 1, 2015

physics
a= changevelocty/time=2(15/3.25)/3.25
March 1, 2015

Physics
at the top? g=v^2/r v=sqrt(gr)
March 1, 2015

Physics
I dont see how you handled the heat of vaporization. Sum of heats gained=0 11.4(-Hv)+681cwater*(Tf-25)+781cAl*(tf-100)=0 -11.4*540+681*1*(Tf-25)+781*.22*(Tf-100)=0 do the algebra, solve for Tf.
March 1, 2015

physics
f=ma=1*5=5N the ball moved only horizontally. Zero vertical force. Your teacher is remarkably too easy.
March 1, 2015

Impulse and Momentum
momentumbefore=momentumafter mVo=(m+M)V solve for V of the combo. Initial KE=friction work 1/2 (m+M)V^2=mu(g)(m+M)*d solve for d. d= 1/2 (m/(m+M))^2Vo^2/mu*g check that.
March 1, 2015

Impulse and Momentum
use momentum in x,ydirectrions, and conservation of energy.
March 1, 2015

Impulse and Momentum
momentum conserved. Write momnetum equations in x, y directions.
March 1, 2015

Chemistry
yes. bAsic math. x^a * x^b= x^ (a+b) x^a/x^b= x^(a-b) you added exponents. The answer is 1.43
February 27, 2015

science 101
A is correct.
February 27, 2015

Algebra
on the abcd, b nor c, nor d can be zero go one step further on the abcd it also equals ad/bc (x^2-1)((x^2+8x+15)/(x^2-9)(x^2+3x-4) now to do some factoring.. (x+1)(x-1)(x+5)(x+3)/(x+3)(x-3)(x+4)(x-1) do some dividing out.. (x+1)(x+5)/(x-3)(x+4) note that x cannot be 3, nor -4
February 27, 2015

science
google the element naam atomic mass... like Cesium atomic mass
February 27, 2015

math
sum moments about the right end. 1275x+136(10.4/2)-L*10.4=0 let L be 540, solve for x.
February 27, 2015

Math vectors
Good lord. xross product is a sine function, if it is zero, the angle is zero or 180, so they are in the same or opposite directions.
February 27, 2015

algebra
I dont understand "will medal and fan". the graphing is easy. Lay out x, y. run x from zero to five run y from zero to 100 plot the points.
February 27, 2015

physics
first. IT is FM. If the frequency is not varying, I wonder how she is "listening" to it, as it will make no sound on her radio. FM does not use towers as antennas, the wavelengths are too short, they use short antenna arrays, which may be installed on a tower, or not...
February 27, 2015

Math vectors
http://www.cliffsnotes.com/math/algebra/linear-algebra/matrix-algebra/operations-with-matrices
February 27, 2015

physics
No friction? net force=mass*acceleration F*cos30=2.0*3 solver for F in newtons.
February 25, 2015

Genetics
yes, however, on st+ is that scarlet recessive, or wild type?
February 24, 2015

Math
if you are looking for n, skubtract nine from both sides 10>-n/5 multiply by 5 50>-n multiply by -2 -50<n or n>-50
February 24, 2015

Pre-Calculus ( Trigonometry)
in round numbers yes. I would have taken the asnwers to nearest tenth of degrees.
February 24, 2015

Pre-Calculus ( Trigonometry)
sinTheta=24/25 theta=arcsin(24/25)
February 24, 2015

physics
Fmax occurs when the block moves. frictionforce=mu(mg)cosTheta weight down plane=mgSinTheta Net force up the plane=Fmin-mg(sinTheta-mu*CosTheta0. so if the net force ukp the plane is zero, then it remains still, or Fmin=mg(sinTheta-muCosTheta) Now, the max value occurs when ...
February 24, 2015

physics
that is two half lives... 50>25>12.5 grams in two half lives.
February 24, 2015

chemistry
lets think. It could be CH4, or C2H4 , or C6H6, or octane, C8H18. Now the ratios of moles of carbon and hydrogen are different in each. Looking at C8H18., the moles of H are 18/8 moles of C Carbon moles: 1/atomicmassC Hydrogen: .033597/atomicmassH Hydrogen moles also equal 18/...
February 24, 2015

physics
What is mass*g?
February 23, 2015

physics
to absorb the energy of the ball without it knocking us over.
February 23, 2015

Trigonometry
draw the diagrams. Label the distance from the first position to the base of the peak as d, and the height of the Mountain from base as H. H/d=tan25 or d=H/tan25 H/(d+500)=Tan20 solve for H.
February 23, 2015

science
Have you looked the CRC handbook of chem and physics?
February 23, 2015

math
liters used=320/4=80 liters cost=59/liter*80 liters=80*59 schillngs
February 23, 2015

Physics
wouldn't it be the area (force x distance) under the curve?
February 23, 2015

dice probability (math)
total less than nine lets look at the ways to get nine or more 4,5; 4,6 four ways to do that 5,5; 5,6 four ways to do that 6,6 one way to do that. Now, ways to get less than 9= ways to throw two die, minus way to get nine or more= 36-9above=29 ways check that. Now, if we roll ...
February 23, 2015

AP Chem
counting 10 H + 12h=22H so it must be 22* 1.084E24/avanumber
February 22, 2015

Vectors Math
oops 2*4+ 2k(-k)=0
February 22, 2015

Vectors Math
a dot b must be zero. Right? 2*4+2(-k)=0
February 22, 2015

Algebra
12*n
February 22, 2015

physics
pulling force=mg*sin37=45*9.8*1/2 about pulling force= about 225 in my head. how did you get -250? In my head, frictional force=about 65 Now let me simplify a lot of this. Notice mass divides out.. mgSin37-mu*mg*cos37=ma g(sin37-muCos37)=a in my head 9.8*about(1/2- 1/5*.796)= ...
February 22, 2015

physics
yes
February 22, 2015

physics
yes. but you said 37 deg, not 35
February 22, 2015

physics
gravity down slope=mg*SinTheta forcepulling-friction=mass* acceleration mgSinTheta-mu*mgCosTheta=mass*acceleration solve for acceleration
February 22, 2015

physics
mass*velocity= momentum
February 22, 2015

Pre-Calculus (Trigonometry)
SinTheta=sin(180-Theta)
February 22, 2015

calculus
and?
February 22, 2015

Vectors Math
if I am on the right diagram AF=1/2 AB 2AE=AB+BC 1/2 BC=AF+AC
February 22, 2015

Math vectors
see other post
February 22, 2015

art last question
http://en.wikipedia.org/wiki/Onion_dome I dont think anyone knows.
February 22, 2015

calculus
I am wondering what the x variable is? or is that times?
February 21, 2015

Physics
write the sum of moments about his feet. assume angle theta .. 400*1.3*sinTheta=70g*1.0*cosTheta tan Theta=70(9.8)/400*1.3 theta= you do it.
February 21, 2015

math
N(t)=14.54+slope*Y Y = year-2009 slope= (15.37-14.54)/5 b. N(t)=14.54 e^(kY) y= year-2009 k= 1/5 * ln(15.37/14.54)
February 20, 2015

Constitutional
You should bring a copy of the sixth amendment, and demand a speedy and public trial by your class peers, and to have counsel by your side. The future of the world belongs to those who insist not accepting that which is wrong.
February 20, 2015

Constitutional
In all criminal prosecutions, the accused shall enjoy the right to a speedy and public trial, by an impartial jury of the State and district wherein the crime shall have been committed, which district shall have been previously ascertained by law, and to be informed of the ...
February 20, 2015

Math Plz help
the probability of something happening is 1.0. so the remaining must be .5
February 20, 2015

Constitutional
correct.
February 20, 2015

Physics
momentum: 3.7*2+.80*3=3.7V1 + .80V2 energy: 1/2 2.7*2^2+1/2 .80*3^2=1/2 2.7V1^2+1/2 .8*V2^2 ok, solve for V2 in the first equation, in terms of V2. Then square it...a bit of paper involved. Now insert that value of V2^2 into the second equation, and solve for V1. Note is a ...
February 20, 2015

Physics
and?
February 20, 2015

physics 2
Intensity of a wave is proportional to the square of amplitude, so if you increas amplitude by sqrt 50, ...
February 20, 2015

math
all are the same? square has to be the answer, if all sides are the same.
February 20, 2015

journalism
Hmmm. I read the original post with four choices, confused is one of the four. I think others have read it as three choices, with "confused" as a posters signature. Now I am confused. bob
February 20, 2015

journalism
I think the thing journalists look for more than anything, is reliability of information. Confused is not reliable. http://www.slideshare.net/LaMediamix/journalistic-sources
February 20, 2015

Math
This is a nutty question. a "real" zero is a solution to a plynomial whch is equal to zero. If poly(x)=0, then a real zero is a real (not complex) value of x which satisfies the equation. So 1. would be a good answer, but it should say "a real solution that ...
February 20, 2015

physics
force=mass*v^2/r
February 20, 2015

chemistry
The trick here is to use your electronegativeity to determine which are covalent. LiF, or instance, is ionic You figure the rest based on difference in electronegativity. Hint: are any Gaseous? Those are probbbly covalent. If three are colvlent, and two are gases, one solid, ...
February 19, 2015

Health
digestion?
February 18, 2015

math
I bet they all are equivalent? Hwy
February 18, 2015

math
Honestly, I do not know what an OPPOSITE number means. It certainly has no meaning in mathematics. I suspect you teacher wants you to say, 15, and minus 15 are opposites. This reminds me of the teacher who worked for me that kept refering to opposite sexes in her classes.......
February 18, 2015

Phsyics
heat=m*c*deltaTemp
February 18, 2015

science
and?
February 18, 2015

Physics
Well, I bet it hurt. Did he have a question?
February 18, 2015

Physics
mass=force/a=???
February 18, 2015

Physics
What is g?
February 18, 2015

calc
y= a^u y'=(u)(a^(u-1))ln(a)du/dx so in my head... (6-x^2)*4^(5-x^2)*ln4*(-2x) check that.
February 18, 2015

chemistry
Hmmm. How many electrons in Silicon atoms? In each atom, there are 14 protons, and 14 electrons.
February 18, 2015

physics
power=work/time=force*distance/time = 245*.7/10 watts
February 18, 2015

Social Studies
19. I dont know in Ga all others correct. On 20, reading the Columbus Consolidated Mayors duties, I agree with your answer. But in Ga, I dont know if Columbus charter is common. Consult your text.
February 18, 2015

economics
When government sets wages or prices, it has little to do with economics, much more to do with politics, or cultural practices.
February 17, 2015

algebra
what is 7+5?
February 17, 2015

mathematics literacy
what is 7/22
February 17, 2015

Algebra
of course, B
February 17, 2015

agreement error
and did he survive? The world waits for the continuation...
February 17, 2015

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