Saturday
July 4, 2015

Posts by bobpursley


Total # Posts: 38,197

Algebra 2
end behaviour is negative large for positive x. I dont know what you mean by "leading" term.
July 3, 2015

Physics
760mmHG is equvalent to 13.6*.760 m =10.34mH2O so add .470/10.34 *760mmHg to each of the readings. I get about 34.6mmHg added.
July 3, 2015

physics
Assuming your tension is correct, then the inward component of tension is what is counterbalancing centreptal force. horizontaltension=mv^2/r tension*sinTheta=mv^2/r 94.8*sin21=m (2PIr/Period)^2/r solving for period Period=2PIsqrt (m* r/94.8*sin21) check that.
July 3, 2015

Chemistry
In short: a cathode is heated until electrons are boiled out, then an accelerating field is applied which moves the electrons in a path towards phosphor coated screen. With suitable deflecting fields, the beam can be moved about to strike certain areas. A large positive ...
June 30, 2015

Psychology
It lends to the argument of nature (biological) control.
June 30, 2015

Chemistry
I agree with that.
June 29, 2015

Chemistry
Nope: Lead atoms and copper atoms pack about the same, with the exception that lead has a greater atomic radius than copper (.175nm vs .128), which when cubed gives a volume ratio of (.175/.128)^3 or 2.5. The atomic mass of Pb is 207 vs Cu 63, so the ratio of mass to is 207/63...
June 29, 2015

Stoichiometry chem
ok, at that point you know how many moles of CaCO3 you have. Now look at the formula: for each mole of CaCO3, there is one mole of C. Moles of C=250.0/100.1 to four decimal places (if your mole mass is correct)
June 27, 2015

science
PEchanbe=heatadded mgh=m c *(tf-ti) solve for tfinal tf tf=g*h/c + ti It never ceases to amaze me when folks use g=10m/s^2. Nowhere on Earth is it that value. Do they think students are imbeciles and can't use 9.8?
June 27, 2015

Pharmacy Tech Math
http://www.unc.edu/~bangel/quiz/testivh.htm
June 27, 2015

Chemisty
how many moles is 24g? then multiply that by -571.6kJ
June 26, 2015

math
Ms Sue is right, my divider is not working right tonite.
June 26, 2015

math
isn't that area equal to 5x6 sq yards?
June 26, 2015

physics
pulling work=800*cos37*8 Joules force friction: (mg-800sin37)mu friction work:(mg-800sin37)mu*8 net work. The pulling did work on friction and the movement net work=pulling work-friction work and the net work will equal the change of KEnergy of the boulder Notice above how ...
June 26, 2015

physics
work done=forceapplied*distance =.15*30*9.8*450 Joules
June 26, 2015

algebra
distance1=50t distance2=175(t-5) subtract first equation from second, solve for t: d1-d2=0=125t-5*175 divide by 5, then 25t=175 t=7 hrs distance=7*50
June 25, 2015

Algebra
ages then: n, n-2, n-4, n-6, n-2(13-1) so last kid is n-24 5*(n-24)=n n=5*6=30 youngestg will be 30-2(12)=6
June 25, 2015

physsics
momentum change = mass*changeinvelocity I wonder if "both" means masses added together.
June 25, 2015

Physics
friction force: mg*.387*Cos2.14 PE gained(due to change height)=mg*sin2.14*distance Initial KE+PE gained=frictionwork 1/2 m 5.15^2+mg*sin2.14*distance=mg*.387*Cos2.14*distance solve for distance
June 25, 2015

Science physics
MA= force output/force input = 30/2 / 10=1.5
June 25, 2015

Science Help. Thank You! (:
Energy Source % of total Natural Gas 46.5% Coal 15.5% Nuclear 14.9% Renewables 13.5% Large Hydro 9.6%
June 15, 2015

physics
what is sqrt(10^2+20^2) in the direction of arctan 20/10 E of N
June 15, 2015

physics
This makes no sense to me?
June 15, 2015

Science
Uracil
June 14, 2015

math117A
isn't this a ratio problem? 4.2/12.6 = 20.4/L L=20.4*12.6/4.2
June 14, 2015

Calculus
http://davidmlane.com/hyperstat/z_table.html set between -2 to +2 SDeviation, see that it is 95.45 percent
June 14, 2015

physical science chemistry
I will check your answers.
June 14, 2015

chemistry
both are monoprotic... Ma*Va=Mb*Vb Ma=Mb* Vb/va=.542*24.1/12.6=
June 14, 2015

Social Studies
https://en.wikipedia.org/wiki/Velvet_Revolution read the section "prior to the revolution"
June 14, 2015

biochemistry
https://en.wikipedia.org/wiki/N-terminus
June 14, 2015

math
mass of oil=density*volume=.90g/ml*18m^3 = .90kg/m^3\ * 18m^3 Weight of oil= above massoil* 9.8N/kg
June 13, 2015

Bernoulli equation
Without the figure... It sounds as if you need to compute the velocityh of the water coming out, then determine the distance it travels horizonally.
June 13, 2015

chemistry
take oneliter of the HNO3. weight=1500grams massHNO3=.63*1500 Molarity HNO3=.63*1500/63*1=15 Now you want to dilute it 15 times to get a 1 molar solution. That means one part HNO3 stock, 14 parts water. if the one part is 50ml, then water is 14*50=700ml, or .7 liter.
June 13, 2015

social studies
https://en.wikipedia.org/wiki/Independence_of_Brazil
June 12, 2015

Alg 2
other point? chose an easy x, such as x=0, compute y (y=29), and immediately you can use symettry for x=6, y=29
June 12, 2015

Science
you have the correct m/v density for the solution. I dont know what you were asked to do.
June 11, 2015

physics
work=m*g*height
June 11, 2015

science
avg velocity=distance/time distance = 1/2 a t^2 + vf*19 where vf=20*1.2 distance=1/2*1.2*20 + 20*1.2*19 time= 39sec compute avg velocity, distance/time
June 11, 2015

Chemistry
you want to dilute it 2.25/.750 times, or 10/3 times. Which means, one part stock, 7/3 parts water. What is one part? 7L/(10/3)=21/10=2.10liter So, take 2.10 l of stock, add to 7/3 * 210 l water, stir and label. BTW, 7/3*2.10 l is 4.90 l check: 4.90 + 2.1 l= 7liters
June 11, 2015

fundamentals of law for health information
bad publicity punishment in pain and suffering penalities opening up other similar cases to litigation.
June 11, 2015

Math
Pr(both engineers)= 4/10 * 3/9
June 11, 2015

physics
I will be happy to critique your work or thinking. It is not helpful for you to post several questions under several different screen names.
June 11, 2015

calculus1
there are two possibilities: The extrema is between -1,8 or the extrema is at the endpoints. f'=-2/3 x ^(-1/3)=0 or x=0 and at f(o) f(x)=1 f"=2/9 x(-4/3) and at x=0, this is positive, so f(o) is a relative min. Now examine the the endpoints: f(-1)=1-(-1^2/3)=1+1=2 f(8...
June 11, 2015

physic
without the figure, ....
June 11, 2015

calculus1
f'=0=2secxtanx-sec^2x secx(2tanx-sex)=0 secx=0 or tanx=1/2 secx which leads to sinx=.5 now, because secx cannot be zero, then sinx=.5 or x=30 deg or PI/6
June 11, 2015

k92 sec.
You will make two moles of SO2 for each mole of CS2 reacted. Moles of CS2: 2.00/molmassCS2 moles of SO2: twice the above STP volume of SO2: 22.4 x moles SO2
June 10, 2015

chemistry
thanks.
June 10, 2015

chemistry
Al: .038*.507 moles Cl: three times the above.
June 10, 2015

chemistry
Lets see: you want to dilute it by 2.73/1.68 or 1.625 times. Which means, you need one part KOH, and .625 parts diluting water. So what is one part? Easy: 153.2 is one part, and then water of 153.2*.625 ml water. Stir, label, and store properly.
June 10, 2015

Algebra 2
4x-32+10=-10 4x=-20+32=12 x=3
June 10, 2015

chemistry
.007 ppm. That is a very slight concentration, so you can safely assume one liter of solution has a mass of 1000grams. So, to get .007 ppm in a million grams of solution, you need .007 grams of sulfuric acid, so in a liter (1000 grams) you need : 7E-6grams of acid. 7E-6grams=...
June 10, 2015

physics
consider the fall: it fell for .8 seconds. consider the distance: velocity*time=3.1*.8 meters
June 10, 2015

phsics
It depends on how the interfernce is created. http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/gratcal.html
June 10, 2015

Physics
initial KE=7 final KE=7+25-frictionwork velocity is doubled, so KE is quadrupled. final KE=28J 28=7+25-friction solve for friction
June 10, 2015

Urgent - physics
This was one of my favorite physics labs...it got us outdoors in the spring. https://www.polarization.com/sky/sky.html
June 10, 2015

physics
reflections are polarized in the plane lying in the surface of the pond. Same issue as reflections off roads or automobiles.
June 10, 2015

Algebra
2x^2 + 9x + 4 = 0 (2x+1)(x+4)=0 x=-1/2, -4 (x - 5)^2 - 81 = 0 x-5=+- 9 x=14, -4
June 10, 2015

Physics
force friction=centripetal force mg*mu=mv^2/r solve for v then time=distance/velocity=5*2PI*r/v
June 9, 2015

physics
the rope is pulling, and lifting ... forcelifting=105sin37 force pulling=105cos37 forcepulling-frictionforce=ma=zero the problem is too easy...friction force=pulling force.
June 9, 2015

Physics
time=distance/velocity=120/200 seconds height fell=1/2 g t^2, and your about 5 feet is correct.
June 9, 2015

calculus1
I will start you ought. A neat way to get to near the solution is to graph cosx + x -2 look at where the graph crosses the x axis. Then change the limits on the graph to expand the area just around that intercept. Keep doing that until you can read it to 5 significant figures...
June 9, 2015

English
And at the Texas State Fair, one can get non-soft, no salt, non-twisted, with bacon. http://cf.creative-culinary.com/wp-content/uploads/bacon-pretzel-rods-unbaked.jpg What is that prezel like? An arrow headed toward your coronary arteries. What does that przel look like? A ...
June 9, 2015

calc
dA/dr=2PI r Put in r=3ft, calculate dA/dr
June 9, 2015

Math
I have a feeling some information is missing here.
June 9, 2015

Pre calculus/ Advanced Functions
I bet f'=-sinx
June 9, 2015

math trigonometry
factor left sinX)(sin^2x+cos^2X)= sinX*1 which does not equal the right. Lets look at the original idenity: at x=45 deg .707^3+.707(.707^2)= .707^3 * 2= .706 now, the right side for 45deg 1/.707=1.4 The indenity is not an idenity as you have written it.
June 9, 2015

math
let f(x)=3 for all x then abs(f(x)) is true but let f(x)=3 for all x>0, and =-3 for all x<0 then f(abs(x))does not equal abs(f(x)) so, I rate the statement sometimes true.
June 9, 2015

Algebra
avg rate= (f(x2)-f(x1))/(x2-x1) a. avg rate= (12-16)/(2)=-2 b. avg rate= (0-12)/2=-6 c( avg rate= (0-16)/4= -4
June 9, 2015

Algebra
y intercept is when x is zero. y=mx+b -6=1/5 *-3 + b solve for b.
June 9, 2015

History
Damon: Reading the choices of answers, your question makes sense. Then re-reading the question, makes one laugh and cry. Wondering where the question writer was "educated". Could have been Texas Tech.
June 9, 2015

World History
There isn't "the answer." This is one of those where you need to critically assess the facts you get from your book (and other sources, like class notes) and discuss them intelligently. The question means: 1. Pick 3 of the following countries: China, Kuwait, ...
June 9, 2015

physics
Q=10sin30=5
June 8, 2015

Physics
On B, it is a right triangle you want the distances to be half wavelength apart, or .512/2 meters different. d= distance walked x= distance from far speaker x-d=1/2 wavelength. or x=.512/2 + d Now the right traiangle: .9^2+d^2=x^2 or .9^2+d^2=(.256+d)^2 .9^2+d^2=.256^2+d^2+...
June 8, 2015

algebra
I bet it is a 3-4-5 triangle. However, in real life, such a cable would be foolish as an antenna feed, due to wind load, and worse, lighting which strikes the tower...the impedance of the tower would be far greater to lightening current flow than the cable, and as a result, ...
June 7, 2015

Anatomy & Physiology
Ms Sue is right. What is the history of the progression? What about family history? How extensive is the paralysis? See the excellent writeup here: http://tulane.edu/som/departments/neurology/programs/clerkship/upload/wch16.pdf
June 7, 2015

HISTORY
To me A is the best answer. See http://en.wikipedia.org/wiki/War_Powers_Resolution
June 7, 2015

algebra 1
another way. ages: n, n+2, n+4 add them 3n+6=60 3n=54 n=18 n+2=20 n+4=22
June 7, 2015

algebra
A+C=450 70A+40C=27750 multiply first equation by 70 70A+70C=450*70 70A+40C=27750 subtract second equation from first. 30C=27750-450*70 solve for C, then go solve for A A=450-C
June 7, 2015

calc
your limits make no sense.
June 7, 2015

geography
Do you mean international trade? Nearly all trade is intentional.
June 7, 2015

Inequalities
multiply both sides by (x-2)(x+1) (x-3)(x+1)+12>8 x^2-2x-3+4>0 (x-1)^2>0 which means that x can be any value except 1
June 7, 2015

chemistry
Jennifer: all these problems are straightforward. I will be happy to check your work. Is there something specific you don't understand?
June 7, 2015

history
Wasn't this the time of a major industrial revolution in the North East?
June 7, 2015

chemistry
K=[NO2]^2/[N2O4] a) you know K, you know N2O4. Calculate. b) again, you know two , calculate the unknown.
June 7, 2015

Social Studies
"re-introduction" It saved society and western civilization. It gave purpose to growth.
June 3, 2015

physics
work=force*distance =11N*.9*2PI/3 power=above/time
June 3, 2015

Physics
see other posts, it is a simple calculation.
June 3, 2015

Physics
Heatgainedbyiron+heat gained by water+heatgained by steam=0 Mass*Ciron*(100-415)+.625*cwater*(100-15)+.144Hv=0 solve for Mass
June 3, 2015

Physics
Sum of heats gained is zero. Heat gained by ice + heat gained by tub water=0 1.33*Hf+1.33cwater*(15.7-0)+8.25cwater*(15.7-Ti)=0 solve for Ti
June 3, 2015

thesis statement
"very important" is not a good quality measure. Everything is "very important" to someone, even rocks.
June 3, 2015

Physics
sum of heats gained is zero. heat gained by hot tea+heatgainedbyice+heat gained by icemelted=0 remember Heatgained by hot tea is negative.
June 3, 2015

CHEMISTRTY
Nano meters? Surely you don't mean that. Could it be manometer? (pronounced man nom eter) now your question: Something is missing here. There has to be some level of Hg involved.
June 2, 2015

CHEMISTRTY
So the other gas traveled 46-20.5 in the same time? Difusion rates are the heart of Graham's law.... now distance=rate=distance/time, so rate and distance are related. So modify Grahm's law... distance1/distanc2=sqrt(Momlass2/molmass1) or molmass2= molmass1*(20.5/25.5)^2
June 2, 2015

sciencce
selection, or phenotype selection.
June 1, 2015

Linear quadratics and inequalities
graphically? Draw the graphs, where do they intersect?
June 1, 2015

maths
what is the question?
June 1, 2015

economics
Suicide rate goes up. Capital expenditures tanks. Hard good inventories build up.
June 1, 2015

chemistry
P1V1/T1=P2V2/T2 P2=T2/T1*P1V1/V2 and v1=v2 so P2=(273+50)/(273+28) * 1E3kPa
June 1, 2015

physics
speed=1.5km/150second velocity= speed, due East
June 1, 2015

Physics
bouyancy will be 20grams (mass water displaced) the apparent mass=relative mass*volume-bouyancy apparent mass=18*20 grams. Now caution, your teacher might be trying to trick you, the real mass of the metal is constant, regardless if it is immersed or not.
May 31, 2015

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