Wednesday
May 27, 2015

Posts by bobpursley


Total # Posts: 38,077

Math
time there= distance/290 time back=distance/210 5hours=distance(1/290 + 1/210) 5=distance(210+290)/(210*290) distance=5*(60900)/(500)=609 miles
May 26, 2015

Pre-cal
depends on the shape of the pyramid...
May 26, 2015

Science (theory of evolution)
we can track mutations in DNA.
May 26, 2015

Chemistry
one mole of ethylene is about 28 grams 10/28=dH/1410kj
May 26, 2015

Economics
Generally, it is a transfer of money (or goods) to the needy by some government agency.
May 26, 2015

Physics
normal force=W*cosTheta 1/3 W=W costheta theta=arccos(.3333)
May 26, 2015

math
FV=4000(1.02) interest earned: .02*4000
May 25, 2015

math packet
2x^2 -6x+3=8 2x^2-6x-5=0 x^2-3x-5/2=0 then the quadratic equation x=(3+-sqrt(9+10))/2 check that, I did it in my head.
May 25, 2015

Math
What is 5^2 * 5^9? you can do others.
May 25, 2015

Algebra
for the life of me, I dont know what you meant by ^3 ?
May 25, 2015

Chemistry ( I NEED HELP REAL QUICK )
moles HCL=.675*.655 so you need 1/3 of that in Al change that to grams.
May 25, 2015

Chemistry
in this case, water is in gaseous form. CH4(g)+O2 (g)>>>CO2(g) + H2O(g)
May 25, 2015

chemistry
Water has strong hydrogen bonds, acetone has very weak intermolecular forces.
May 25, 2015

chemistry
Could it be that all have stronger affinity for glass molecules than affinity for themselves?
May 25, 2015

earth science
Ocean?
May 25, 2015

Physics
stress=force/area strain=deformation/length
May 24, 2015

Physics
energy=1/2 k x^2=1/2 300N/m * .03^2 m^2 = 150*9E-4 Joules
May 24, 2015

Science
it is interference
May 24, 2015

Chemistry
No.
May 24, 2015

Chemistry
you know, you can google these names...
May 24, 2015

Philosophy
Out of chaos, comes understanding. At least, for the Gestalts. Now in my experience, gestalt thinking does not start to take place on a large scale until one leaves the concrete domain of thinking... https://visuallygifted.wordpress.com/2010/08/15/what-does-it-mean-to-be-a-...
May 23, 2015

Algebra
Again, it depends on the academic track you are on. For most, basic factoring and grouping is essential.
May 22, 2015

Algebra
basic skill for what? College? auto repair? Cooking?
May 22, 2015

Math
if he wrote for five days, that would be ....40 hours...
May 22, 2015

Math
The issue really is how is the 120m measured...horizontally, or not. I suspect there is a picture that tells you. Assuming horizontal distance... height to top of flagpole: 120Tan49 height to base of flagpole: 120Tan46 height of pole is the difference, or 120 (tan49-tan46)=13.8m
May 21, 2015

physics
The average velocity in the board is vavg=(vout+vin)/2 figure that. then the time in the board is thickness/velocty average
May 21, 2015

math plz help quick
maybe it is reduced, or converted to decimal. The above are correct.
May 21, 2015

math plz help quick
pr(girls)=6/10*5/9
May 21, 2015

Chemistry
Heatpropane=heatin water massP*Heatcombusion=Hf*100g+100(cwater)(75.5-0) so figure the mass. when looking up the heat of combustion for propane, you want it in Joules/gram, if the table is in juouls/mole, you will have to convert.
May 21, 2015

math plz help quick
pr(blue, green)=3/total * 8/total in this case, total=23
May 21, 2015

Physics
what is your thinking. This is a thinking set of questions..
May 21, 2015

math
Hmmm. She made 3 on her math test, and the average was 81.... This is pretty easy to choose history is her best subject.
May 21, 2015

Math: related rates
ok, draw the figure. label the point of her shadow as x, and her position as y. Now make a triangle from the pole to the shadow. Notice the triangle formed by the girl and the shadow tip is SIMILAR to the large triangle. So similar sides.. 26:x::5:(x-y) (x is the full length, ...
May 21, 2015

Math!! (repost) really need help!!
volume of a right cone: 1/3 * area base*height the area of the base is PI*12^2 Your thinking explained is way off base. You would be doing better to use a dart board. Use the formula above, better yet, MEMORIZE it.
May 21, 2015

Zoneton
for the life of me, I can't make any sense of what you have typed.
May 21, 2015

Math
one answer would be no solution, another would be no unique solution (ie, the lines of the equation are the same, example; x+4y=3 2x+8y=6
May 21, 2015

Math- simple polynomials
well, these are not polynomials. Look up the definition of polynomials. What these are are powers to a base. Rules 3^2 * 3^5=3*5 4^2 * 4 * -3=4^-1=1/4 5^4/5^6=5^4 * 5^-6= 5^-2=1/5^2 4^3 * 7^3...can't be combined, you have to have the same base.. a^3 * b^5/(a^4 * b^5)= a^(3...
May 21, 2015

Calculus
iii cannot be true at x=0 The function is not continous, which is a requirement for the MVT.
May 20, 2015

Calculus
see other post.
May 20, 2015

Calculus
so what is happening when f"<0 ?
May 20, 2015

English
in spite of....my not loving grammar...I do the best I can with a smile on my face.
May 19, 2015

algebra
on the 1,4 point y=mx+b 4=5*1+b b=-1 on the 6,y point y=5*6-1=29
May 19, 2015

English
it's means it is its is possessive...http://www.its-not-its.info/
May 19, 2015

algebra
x goes from 6 to 10, y goes from -4 to 2 so x changed by 4, y changed by 6 y=mx+b y=6/4 * x + b now test the first point -4=6/4 * 6+b b=-4 -9=-13 y=1.5 x -13
May 19, 2015

math
he had 2/3, and his friend has 1/3. Did I read this right?
May 19, 2015

chem
lets think. You are increasing pressure about 20 percent, and redkucing temp very slightly. volume ought to go down about 20 percent due to pressure, and no noticalbe change on temp. you went from 800 ml down to about 640, about a twenty percent change. Looks good.
May 19, 2015

theory of evolution
first one: wouldn't thorns discourage herb eating animals? second one: A varacious?? new predator? That is certainly a new predator. I bet you meant Voracious I agree with your answer as it is the best answer. The question in my mind is the word "rapidly". Few ...
May 19, 2015

Chemistry
Normality*volume=normality*volume Normalityacid=1*13.5/10=13.5 Molarityacid= 13.5/2
May 18, 2015

science school
it is getting 8 grams of bouyant force, so it must have a volume of 8ml in water. In oil, it is getting 7 grams bouyant force, so denity of oil=7/8 g/ml relative density oil=7/8
May 18, 2015

science (any tutor)
correct
May 18, 2015

MATH HELP! LAST QUESTION!
I am not certain you will ever win playing with dice. Stay away from Atlantic city. How did you come up with the idea there are six ways to get five?
May 18, 2015

MATH HELP! LAST QUESTION!
spinning the whell? pr=1/6 throwing dice: up to 36 possible ways ways to get 5: 1,4;4,1;3,2;2,3 or 4 ways pr(5)=4/36=1/9 so it is better to spin the wheel.
May 18, 2015

chemistry
Molarity=moles/volume=75.6/(MolmassMgO*.175)
May 18, 2015

science (any tutor)
correct.
May 18, 2015

science (any tutor)
d is the best answer, but it is far from adequate.
May 18, 2015

math help please
change all to something multiplied by sqrt2, then add
May 18, 2015

science (any tutor)
ok, d is right.
May 18, 2015

HELP!! MATH!
1. Pr(p, w)=7/9*2/8 2. pr(w,w)=2/9, 1/8 3. obviously, purple then purple is greatest chance Pr(p,p)=7/9,6/8 Pr(w,w)=2/9,1/8
May 18, 2015

math help please
add. f^5
May 18, 2015

math
nope. Looks like -4 to me
May 18, 2015

theory of evolution
1. wrong. Evolution is not concerned with individuals adapting, but with genetic mutations or differences which favor survival and repoduction. 2. wrong. You just discovered an unknown branch of aminalia in the "tree of life'
May 18, 2015

Calculus
can't you self check these by inserting the answers you got? This is not calculus, if your teacher is teaching "calculus", ask for your money back.
May 18, 2015

Math Please Check
1. 12/5 * 20/30=2*4/10=4/5 others look right
May 18, 2015

physics
zero.
May 18, 2015

physics
constant acceleration.... down the plane: mgsinTheta friction up the plane: mg*mu*cosTheta Net force=ma mg sinTheta-mg*mu*cosTheta=ma a= g(sinTheta-muCosTheta) find a, then distance=1/2 a t^2 solve for distance
May 18, 2015

Science help
the units tell you the magnitude. There is a great difference between 34 ft/sec and 34 inches/second Next, knowing the exact units allows you to convert to another system of units.
May 16, 2015

Culc please help
figure for x=-4,-3,-2 area=1*(f(-4)+f(-3)+f(-2)) = 51+30+15
May 16, 2015

math
yes, if you have the understanding of b and h.
May 16, 2015

Physics
three resistors in parallel? Exactly what are you looking for?
May 16, 2015

physics
work done=change in kinetic energy = final KE - initial KE = 1/2 m (vf^2-vi^2)=
May 16, 2015

Science
mass=.8*molmassCompoundabove
May 16, 2015

chemistry
Kc has no units in the SI system. If someone is teaching you otherwise, they are wrong. forward and reverse depends on how you write it. In the above, forward is from the left to the right.
May 16, 2015

Calculus
Nope, time is not even a factor in this.
May 15, 2015

Algebra 1
Honestly. If you dont want to open a textbook, get a tutor if you dont understand these varied issues. My experience in teaching tells me you are answer grazing....or you have never opened your texbook. Take 15 for instance, that is pretty basic. as is 16.
May 15, 2015

english
Go to the head of the class, you are right. In engineering, the basic rule of reliability engineering is that redundancy matters. However, redundancy increases costs, so the fight is on over the "quality" of the product, and the "make it cheaper" folks.
May 15, 2015

programming concepts
Do you really expect someone to do this assignment for you?
May 15, 2015

science
40joules=numberelectrons*chargeoneach*20volts
May 15, 2015

math
number 1 and 3 are correct. On 5, I am wondering when is interest added, if it is the end of year, then you have only one years interest credited to the account.
May 15, 2015

Physics
There must be a diagram that goes with this.
May 15, 2015

physics
a=v^2/r=(22^2)/45
May 15, 2015

Chemistry
at what rates ???? are being produced.. the mole ratios are handy well, you get twice as much CO2 as ethane, mole wise. Now at the same temp, pressure, this means twice as much volume also so, lets just consider the moles first. ethane is being consumed at .7mol/sec, which ...
May 14, 2015

Chemisty
typo log base e (as in ln) of 2 is .693
May 14, 2015

Chemisty
log base 3 of 1 is .693
May 14, 2015

MATH PLEASE HELP THIS IS A TEST!!!!!!!!!!!!!!!!
you have 2, 5, 6 right
May 14, 2015

exams
google SAT exams, you will find a wealth of information.
May 14, 2015

science
momentum is a vector. So if it reversed, the change in momentum has to be twice the striking momentum (mass*vel), but in the upward direction.
May 14, 2015

Physics
You have te correct formula...r is the distance from the center of the satellite to the center of Earth.
May 14, 2015

science(physics)
draw the figure. downsteam, 1, on the hypotenuse upstream 2 the angle upstream measured from the normal across the stream is arcsin 1/2 or 30 deg
May 13, 2015

Math
fraction=12/252
May 13, 2015

Math
the difference now is 2 1/3-1 2/5 2 5/15-1 6/15=9/15 double that 18/15=1 1/5 cup
May 13, 2015

PHYSICS
Of course it is wrong, you found the final temp warmer than averything. the sum of the heats gained is zero. Heatgainedsoda+heatgainedwatermelon=0 12*.35*3800(Tf-2.69)+6.05*Cw(Tf-24.1)=0 for cw, assume the watermelon is water. solve for Tf
May 13, 2015

Algebra
the distance is the same. v=riding velocity against wind v+5=riding velocity with wind. time there=(30/v) time back=(30/(v+5)) so 5=30/v + 30/v+5 v(v+5)=6(v+5)+6v v^2+5v-6v-6v=30 v^2-7v-30=0 (v-10)(v+3)=0 v=10
May 13, 2015

Algebra
And your thinking is....?
May 13, 2015

physics
momentum lost=momentum block gained 10*150=1000V solve for v.
May 13, 2015

math
what is 19.8km/(2PI*.63m) 19800/6.28*.63 ?
May 13, 2015

Chemistry
energy=masswater*Cwater*6
May 13, 2015

Please help
http://www.diffen.com/difference/Communism_vs_Fascism No, it is not the second.
May 13, 2015

algebraic modeling
put in 100 for x, and calculate c(100)
May 13, 2015

english
The word Honey is in two of them. Is that significant?
May 13, 2015

math
when n=1, x=3 when n=2, x=10 looks like 7n-4 to me
May 13, 2015

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