Tuesday
September 2, 2014

Posts by bobpursley


Total # Posts: 35,875

social studies
It is a ridiculous statement, in my opinion. Dopers always have an excuse, the same as alcoholics. "Well, it is Friday, so we have to go out and have a drink" The main cause of drug addition is 1) chemical processes in the body, and 2) lack of personal character to ...
September 2, 2014

mathzzz want answer in simple way
people=number rows*numberseatsperrow people= r^2 solve for r.
September 2, 2014

Physics B
d=vi*t+1/2 a t^2 1=vi*48.6+.01305(48.6)^2 solve for vi
September 1, 2014

Pre cal
all x except x=-3 or x=1 all x except x=0 or x=3 2. range depends on the domain. if all x is allowed, then rande is all real numbers if domain is all real numbers, then range is -1to inf (think, what if x=2, what if x= inf, what if x=-inf)
September 1, 2014

Physics - General Physics
sin i / sin 31.380 = nv-.0420 sin i/(sin 30.7)=nv sini=(nv-.0420)*sin31.389 sini=nv* sin30.7 set them equal, solve for nv
September 1, 2014

chem
the volume of each cube is 8cm^3 new water level: 48.0ml
September 1, 2014

KIPP Believe
Another way: when a ratio such as 17:3 , that means for each 20, 3 are faculty. faculty = 3/20 x 740= 111
September 1, 2014

Physics
If you take the area(s) under the v-t graph, that area is distance. Add the two areas, subtract frm 265, that is the distance left.
September 1, 2014

science
Forcey=-eE displacement y=0=2.4E6 cos38-1/2 eT/mass*t^2 where e is absolute charge on electron, mass is mass of electron. ok, what time does it cross the xaxis? distancex=vx*t .015/2.3E6 =t put that t in the displacement equation, solve for E.
August 31, 2014

Check this please?
essay? "Writing about" is hardly a thesis. Do you have a point you wish to make, or to compare different groups? The choice of "Democrats" and "Republicans" are hardly cohesive groups in themselves. I think I would look for more cohesive groups of...
August 31, 2014

American Constitutional Law
Why is it not a selective incorporation?
August 31, 2014

Physics
change km/hr to m/s Net force from centripetal and gravity shouuld be a some angle theta. Tan theta= v^2/r / g= v^2/rg solve for theta Now, the outer edge: SinTheta=outeredgeincrease/8m solve for outer edge increase
August 31, 2014

physics.
sum moments about the forward bottom edge. sF=mg*s/2 F=weight/2
August 31, 2014

physics : friction
friction force=100, constant speed 120-100=ma solve for a
August 31, 2014

physics
summing forces about the pulley 9g-6g=15 a solve for a tension? 9g-6a=tension
August 31, 2014

physics
This makes no sense to me.
August 31, 2014

geography
do you know how to google?
August 30, 2014

algebra 2
sale price=.7*19.49
August 30, 2014

Calculus-Math
sketch it. length= L = 1m 1= x^2+y^2 0= 2x dx/dt + 2y dy/dt dy/dt= -(x/y)dx/dt but x=1/2 sin PIt/4 dx/dt= 1/2* cos(PIt/4)*PI/4 Now when x=1/16, then y= sqrt (L^2-x^2) at x=1/16, then y= sqrt(1-1/256) y= sqrt (255/256) dx/dt= PI/8 * cos (PIt/4) and x/y= (1/16)/(255/256)=16/255 ...
August 30, 2014

physics
density=mass/volume=1kg/(PI*.026^2*.0485)
August 30, 2014

Physics
5.0Cx − 6.5Cy = 0 −3.5Cx + 7.0Cy = 15.0 using determinates D= 35-22.75 = 12.25 then x= +15*6.5 divided by 12.25 cx= 7.96 cy= 75/12.25=6.12 A.C= (5*7.96-6.5*6.12)= zero B.C= (-3.5*7.96+7*6.12)= 15 You dont have to use determinants, but it is pretty fast on a 2x2
August 30, 2014

PHYSICS
How much work does your 2.20N push do on the book? 2.2*2.2 J How much work does the friction force do on the book? .5*2.2 J the book does not move vertically, so gravity and normal force do not work. net work= workdont-friction
August 30, 2014

Physics
I assume F=F1+F2 1 add the x components: 22Ocos41+50cos139 2 add the y components: 220sin41+50sin139 3 for the magnatude, then Magnitude=sqrt(x^2+y^2)
August 30, 2014

Music
google "wiki aria" google "wike sonata"
August 30, 2014

math
http://en.wikipedia.org/wiki/Open_sentence The equation approximates the pattern, so you can predict. for instance, the equation x= 4t approximates what you observe for t= 3, or 5, 6, 17, and 89 so then you can predict x when t=9.1
August 30, 2014

Math - Precision and Significant Digits
correct.
August 30, 2014

Physics
because it does not record displacement...it can't record velocity. Ever wonder how a GPS locator records velocity?
August 30, 2014

physics
A very stupid problem. Assume your instructor meant: A car passing a certian point is traveling 17m/s to the right. 17 seconds later, at some point it is going 46m/s to the left. Assume the car is under constant acceleration at all times. Vf=vi+at -46=17 + a*17 solve for ...
August 30, 2014

physics
During fall, it is under the influence of gravity d=4.9 t^2 where t is the time it fell. t= sqrt d/4.9 not sound has to go back up. d=345*t1 where t1 is the time back up. but you ARE given t+t1=43 seconds (deep well) so, 43=t+t1=d/343 + sqrt (d/4.9) solve this quadratic ...
August 30, 2014

physics
vf^2=vi^2 + 2 a d you forgot to vi is squared in the equation. Take the square root of what you got.
August 30, 2014

physics
vf^2=vi^2+2ad d=400, a is given, vf=0, solve for vi
August 30, 2014

physics
the forces are the same, opposite direction. 42*3=69*ab solve for the acceleration ab .
August 30, 2014

Physics
p(t)=Po+ v(t)*time + 1/2 accelration * time^2 for constant acceleration. Now for changing acceleration and velocity, you have to go to calculus... P(t)=Po+ INT v(t) dt + INT (INT (v(t)dt)dt
August 30, 2014

Physics
time=distance/velocity= 7E8/3 years
August 30, 2014

physics
Jack: d=1/2 g t^2 not time when his stone is 6.6, is t1=sqrt (6.6/4.9) compute that Jill d=v*(t-t1) +1/2 g (t-t1)^2 Now you know d=24.4 solve for Jack time t then, go to Jill equation, solve for v.
August 30, 2014

Science
yes.
August 28, 2014

Physics
displacement is a vector. Without knowing how positions are located, it it cannot be determined. If they are in a straight line, then F should be -6, D is wrong. c is wrong.
August 28, 2014

Chemistry
volum of water removed: 1/3 ft x 36.5ft x 15ft. calculate that volume Now convert ft^3 to gal. there are 7.48 gallons per ft^3 Now, time=volumeinGallons/ratepump
August 28, 2014

pol 201
I dont have a clue what is expected here. law? decision?
August 28, 2014

algebra
Actually, one could use set builder notation if you defined the set Y as {1.68,2 1/100, 3 7/40, 2.16, 4 2/5, 3.86 } Then you could say density belongs to the set Y. It is an odd way, but it is correct. the set interval 0<D<10 contains the densities
August 28, 2014

phys
I agree it is wrong. What I am wondering, with these two charges, where are you determining E? E is a vector.
August 28, 2014

science
forc=Kq2*q0/.03^2 solve for q2 q2=force*.03^2/kq0 c is asking for charge from force
August 28, 2014

physics
You have missed the point on unit conversion. KEEP THE UNITS. 6.5E-3 gcm/hr*1kg/1000g*1m/100cm*1hr/3600s notice the units divde out, and you are left with kg m/s Now do the math 6.5E-3*1E-3*1E-2*1E-3/3.6 kg m/s 6.5/3.6 E -8 you are right.
August 28, 2014

Science
I think you are wrong. A is the best choice.
August 28, 2014

Maths
Area walkway=PI(10^2-6^2) think about outer and inner circles.
August 28, 2014

Science
see other post
August 28, 2014

algebra
2. find half life from 5am, noon counts as done above. Then, figure amount remaining from the same formula knowing noon count, and halflife.
August 28, 2014

algebra
1. amountremaing=original(e^(.692*time/hslf) .1=1 e^ ( ) take ln of each side ln(.1)=.692*100/halflife halflife= you do it. I get about 30 days.
August 28, 2014

Biology
two traits, from the source you read: lack of peer review, the author not being a respected source, and having an old publication date. That is three, choose two. I am wondering (you don't have to answer), are you scanning material looking for the "answer", and ...
August 28, 2014

Biology
Plagarizer. http://www.wikihow.com/Evaluate-the-Credibility-of-a-Source The answers are there, but you need to stop copying the wrong parts, and trying to baffle your readers with words. Your above answer is ridiculous, reading the question itself.
August 28, 2014

finance
wondering what the difference is between future value, and present value, isn't that interest?
August 28, 2014

finance
figure the present value of the four payments, then add. That is what you should pay, no more.
August 28, 2014

math
what is 8.4*1.15?
August 28, 2014

finance
http://www.investopedia.com/calculator/pvcal.aspx time period 48 interest rate: 7.75/12 future value: 235
August 28, 2014

calculus
http://www.mathalino.com/reviewer/differential-calculus/14-ladder-reaching-house-ground-outside-wall
August 28, 2014

chemistry
A2Y A3Z BY B3Z2 CZ C2Y3 check those.
August 28, 2014

MA120 help please
a/b=((a+b)/b ba=ba+b^2 which cannot be.
August 27, 2014

physics
time=distance/speed
August 27, 2014

Math
I know in real life it is not linear, but maybe I know too much. As a linear function: SugarRemaining=5.5-0.1 D so put in 7, then 23 for your equation, A= 5.5 - .1 x
August 27, 2014

Math
67 thousand 670 hundreds
August 27, 2014

Math- urgent
Q+D=8 25Q+ 10D=125 Q+ D=8 multiply the second equation by 10 25Q+ 10D=125 10Q+ 10D=80 subtract the second equation from the first. 15Q=45 Q=3 then D=5
August 27, 2014

memphis school
one East has went 30mi one N has went 72 miles right triangle distance=sqrt(30^2+72^2)
August 27, 2014

physics
vf1=2.84t vf2=vf1+a2*t but vf2=2.4*2.84t 2.4*2.84t=2.84t+a2 t divide out t, and solve for a2. Check my thinking.
August 27, 2014

math
center must be x,y, or (3,1) diameter is more compliated: diameter=sqrt[(-1-7)^2 + (3+5)^2 ] radius is half that (x-3)^2+(y-1)^2=radius^2 will work. check that math, it is easy to err when typing
August 27, 2014

Question
they know when my tulips are ripe...
August 27, 2014

Math
what is the probability of one arrow hitting one target?
August 27, 2014

Trigonometry
3 (x-4)(x-6)=0 multiply it out x^2-10x+24=0 I will be happy to check the others.
August 27, 2014

calculus
Wont there be more than one region? Have you sketched this?
August 27, 2014

Math, Science, Sociology, Economics

August 27, 2014

Chemistry
moles NaOH=963/40=you do it. 1.5M=moleNaOH/literswater solve forliters water.
August 27, 2014

science
it will be a curved line, I would use a line graph, however, a histogram would work also.
August 25, 2014

chemistry
constant=Partial pressure / solubility
August 25, 2014

math
What is 32.95*.7 ?
August 25, 2014

Nuhu Bamali Poly zaria Nig
Was this an experiment? What was done?
August 25, 2014

Aviation #2
https://www.ntsb.gov/investigations/process.html
August 25, 2014

chem
In air at 10atm? Dry Air is about 78 percent Nitrogen, so partial pressure at 10atm=7.8 atm The issue always underwater vs above water, is that air below water as in a casson is wet air, fully saturated, so water vapor reduces the partial pressures of the other gases slightly...
August 25, 2014

Aviation
There are thousands: wiring color codes placement of instruments on panels welding standards riveting standards Metalurgy standards tire standards Human factors standards redundany hydraulic, and electric standards navigation light standards communication standards traning ...
August 25, 2014

Investigation Domain Contexts
see other post
August 25, 2014

math
They all are multiples of 30 5:3:2
August 25, 2014

algerbra
slope= changey/changex=(2-(-4))/(-1-(-10)) = 6/9 y= slope*x + Yintercept using either pint (I will do the second) 2=6/9 * - 1 + Yintercept Yintercept=8/3 which makes answer a the only possible answer. check my work
August 25, 2014

Math
and what do you think?
August 25, 2014

algerbra
cost=9+48*h
August 25, 2014

CRITICAL THINKING
We wont know until you give us a try. Truth is, nothing is free. Here, it will cost effort and time.
August 25, 2014

CRITICAL THINKINGSO
We wont know until you give us a try. Truth is, nothing is free. Here, it will cost effort and time.
August 25, 2014

Math
to to 88ths 1 77/88 -5 64/88 (88+77-5*88-64)/88 = ...
August 24, 2014

Chemistry
distance=rate*time 2miles=5.5m/s * time 2miles*1603 m/mile =5.5 m/s*time 3205m/5.5m/s= time time= 3205/5.5 seconds check my numbers
August 24, 2014

Physical Science
jelly is a mixture (semisolid solution, normally) sweet tea is a mixture of water, sugar ketchup is a mixture of vinegar, tomato sauce, spices
August 24, 2014

Physics
vf^2=vi^2+2*acceleration*distance
August 24, 2014

Algebra 2
70=29.99+ N*5.95 N=(70-29.99)/5.95 Looks like six?
August 24, 2014

Math
no, you have to subtract the margin on both sides, and top and bottom W=8.5-2(1 1/4)=8.5-2.5=6 L=11-2(1 1/4)=11-2.5=8.5 P=2(6+8.5)2*14.5=29 check that
August 24, 2014

PHI 208
Practice makes perfect? People forget the bad things in your past, so make changes. I am having fun with this.
August 24, 2014

chemistry
for every mole of O2, one needs 2 moles NO, and gets 2 mole of NO2 82 moles of O2 would require 164 mole NO, which is not there. So NO is the limiting reactant. 79 moles NO>>>>79 moles NO2 Adding more NO>>>>making more NO2 adding more O2, no effect.
August 24, 2014

Physics
385=9.81*40.0*altitudefactor Now the force of gravity is inversely proportional to distance from center, so altitude factor= (re/(re+h))^2 where re is radius of earth, h is altitude above surface.
August 24, 2014

physics
force*distance=1/2 m v^2 solve for frictional force
August 24, 2014

physics
Momentum=total mass*velocity change km/hr to m/s 90km/hr*(1hr/3600s)*1000m/1km= 90/3.6 m/s check my thinking
August 24, 2014

chemistry
from what?
August 24, 2014

Teaching in Early Childhood Programs
Remember, a tidy desk contributes to a focused mind. I agree.
August 24, 2014

TEACHING IN EARLY CHILDHOOD PROGRAMS,
Yes, of course. However, it does not help one's blood pressure when the kid has covered their arms, face, and the neighboring kids with paint. Or in the case of Homeschool, the sofa.
August 24, 2014

physics
If you assume KE is convserved, I think you will find a solution is impossible, assuming one could hit both balls simultaneously. The conservation of momentum and energy will give you the following variables: v', v2, v3, theta1, theta2 (v' is the velocity of the first ...
August 24, 2014

Physics
What is Newton's Gravitational law? Force=G Mm/r^2 grab your calculator.
August 24, 2014

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