Friday
April 18, 2014

Posts by bobpursley


Total # Posts: 35,072

Algebra 1
h=-16x^2+100x=x(100-16x) when is h zero? answer, when x= 100/16, and x=0 IT is a parabola, so the max apex is at 1/2 the time between the zeroes, or at time= 100/32 use that x to find max height in the original formula.

Algebra
6300=x + Y .11x + .08y=597 cna you take if from here?

TO ANY SCIENCE HELPER
It depends entirely on the problem. I don't have a clue what you are trying to figure out.

English Composition
and kid is still young and has not developed keen judgement of others, or self.

Physics 1
in what time? torque=MomentInertiadisk*changew/time

6th grade math
I can much help making a graph on this. distance = speed*time, so on a distance time graph, you will have a sloping line upwards..

Physics 1
same density. Ok, roll them down a slight incline. They will have different moments of inertia, so the hollow one will have more inertia,so it will lag behind the solid ball. http://hyperphysics.phy-astr.gsu.edu/hbase/imgmec/mic.gif

Physics 1
Is the Earth Rotating? net torque means it is accelerating...

Physics
net force=mass*acceleration Now the issue is what is net force: Net force=pulling force-friction friction is easy to figure (m*mu*g) so exactly what is the pulling force? Not given. Not known.

Physics
I have not a clue what the problem is. What is the relationship of the vault to the car?

biology 6
http://www.sciencedaily.com/articles/c/convergent_evolution.htm

physic II
average KE= constant*abaolute temp average KE= (273+40)/(273+20) but KE is proportional to v^2 so velocity has increased by sqrt above.

physics
it has to gain sufficent force to rise which equals the weight of the height of the water. We will calculate in gauge pressure... pressure=force/area= density*area*height*g/area= density*g*height height = 26m density= 1.04E6kg/m^3 g= 9.8N/kg so calcualate pressure, it ought to...

Language Arts
From my experience, you are correct. A.

Alg
d=65ft=.04v^2+.05v put this into quadratic form, and use the quadratic equation, solve for v.

Personal Finance
He probably is solving for future value, however, one needs to think always in present value.

Physics please help?????
Honestly, I dont get the picture.

national academy physics
distance= 3000m displacement=0

justin
what is 145*130 divided by 65? Is it 300?

Math/Physics
John distance=20*time Jane distance=15*time+1/2 a time^2 set them equal, solve for time then solve for either distance in that time.

Math
12/25 * 10/14 * 7/18 I see a 7 which can go into 14 I see 5 which can go into 10 and 25 12/5 * 2/2 * 1/18 Now, I see six goes into 12 and 18, so 2/5 * 2/2 * 1/3 2/5 * 1 * 1/3=2/15 check all that.

Math
time upriver=distance/(S-2) time downriver= distance/(s+2) 8hours=79.2 ( 1/(s-2) + 1/(s+2)) a bit of algebra, but get a common denominator on the right (s^2-4), 8hours=79.2 ( s+2 + s-2)/s^2-4 then combine, put it in quadratic form, and solve for s.

science
the centripetal force from rotating is exactly equal and opposite to gravity: net force is zero.

Geometry
COSINE was originally written "co.sine," short for COMPLEMENTI SINUS: the sine of the complement. The COSINE of angle AOB is the sine of the complementary angle (ABO ). So Your question states it wrong. COMPLEMENTI SINUS does not mean the complement of the sine, it m...

science
angular velocity at all point is 2pi/day linear velocity=angular velocity*radius*cosLatitude

physics
A shout down a well produces an echo in 2.00 seconds. How deep is the surface of the water in the well? Assume the speed of sound to be 343 m/s. distance=time*speedsound solve for distance. Then, well depth is one half distance.

english
I love it. I remember doing that in eighth grade English, my teacher was not amused. I remember she gave words in patterns of ten. She learned finally to change her instructions from "Write a sentence using each of these words in context" to something more legalistic...

physics
This is a most flawed problem. Perhaps the author has a different understanding of friction than I.

physic II
Perfect gas? Nitrogen? You have to be kidding. PV=nRT 1atm*2liters=n*R*273 solve for n, thenumbe of moles. Watch what units of R you use atm, liters... mass of the gas=n*molemassN2

Physics
ignoring air friction, the acceleration of the ball is due to gravity, always pointed downward.

PHYSICS
The image is 4.4 m from the dog. b. rate relative to the dog, or surroundings? Relative to the dog, .56m/s, relative to wall, .28m/s

Written Communication
Have you ever assembled a lego village? Carved a piece of wood? Put on a pair of pants when dizzy? Been in a carwreck?

Chemistry
each Al xfers three electrons, six total donated Br each atom accepts one, for a total of six accepted.

physics
It is not reasonable to assume conservation of energy. There is not enough information to do this without the conservation of energy.

physics
YOu are given mass/length. You are given half wavlength length of 6.9m, and 20 m. wire 1 has a third harmonic wavelength of 30 m. First overtone of wire2 has a wavlength of 2*6.9m

physics
I will be happy to critique your thinking. Giving you the answers is less appealing to me.

physics
massdeficit=energy/speedlight convert MeV to joules first.

trying to understand math
How many shifts do each of you work per week?

Science
Desolate?

CALCULUS
Can you sketch the curves?

Physics
on each nail? 75*g/10,000mm^2 want it in N/m^2? 75g/10,000mm^2 * (1mm/.001m)^2

algebra
what help do you need with this? I will be happy to critique your work.

alegebra
see other post

Algebra
In my head: Sam can do two houses in 12 hours, Pat can do one. Toghter, 3 houses in 12 hours, or 4 hours per house.. formulary: total houses=rate*time 1 house=((1house/6hours) + (1 house/12hours) * time 1 = ((2+1)/12)time time = 12/3 hours

Biology
1. http://en.wikipedia.org/wiki/Follicle-stimulating_hormone#Effects_in_males 2. https://www.inkling.com/read/guyton-hall-textbook-of-medical-physiology-12th/chapter-80/testosterone-and-other-male-sex 3. https://www.google.com/search?q=human+chromosomes&client=firefox-a&hs=HBQ...

Energy multiple choice question
specific heat=heat/(mass*deltaTemp) a. c=13000/100*1= 130J/kg*K b. c=1050/.050*5=1050/.25=4000J/kg*K c. c=2340/2*3=amost 400J/kgK check my work.

Physics
the sum the heats gained is zero. heat1+heat2=0 5*c*(Tf-10)+1*c*(tf-40)=0 c divides out, solve for Tf tf(5+1)=50+40 tf= 90/6=15C

art 101
What does a shadow indicate?

physics
Use either Biot Savart Law, or Amperes law: the magnetic field is related to the current enclosed....

math
a. Are you guessing? Start with the range, it eliminates in a mental calculation very rapidly your choice. b. start with the outliner, clearly 39. that means answer H, or I. Then if you remove the ouliner, the mean has to be lower, of H, I the lowest mean is H. Answer H. Many,...

math
sale price= .8(cost*1.40) profit= sale price-cost price. b. if sale price=.8(cost*1.40) then cost= sale/(.8*1.40) and profit=sale-sale/(.8cost*1.40)

Social Studies
water, of course

Pre cal
y=sin(x-PI) reflecting it, y=-sin(x-PI)

Math
team average? hits/at bats.

Physics
2PI/360deg * 222deg

chemistry
you want to dilute it 2.88/1.03 =2.796times, which means 1 part original, 1.796 parts water. what is 1 part? 1 Part= 250ml/2.796=89.4 ml original solution, then 250-89.4 ml water. Stir, label.

MATH
what do you think?

algebra
Is there a question here?

math
8g^7h^-3 /2g^4h^8 4* g^(7-4)*h^(-3-8)=4g^3h^-11=4g^3/h^11

math help
remember that a^b *a^c/a^d= a^(b+c-d) ? 8x^7y^4/(2x^3y^2)= 4 (x^(7-3))(y^(4-2))

Chemistry
I dont think so....the water was initially hotter, and putting cold lead in made it hotter? I don't think so. Recheck.

Chemistry
formula? The concept is the closed container gains no heat from outside, so the sum of the heats gained is zero (one gains, one loses). Heatgaindlead+heatgainedwater=0 2.85g*clead*(Tf-10.3C)+7.55g*cwater*(Tf-52.3)=0 look up the two specific heats (watch units, your mass is in ...

Physics
tangential linear speed= angular speed*radius=4.2 rad/s*12cm= ... centripetal acceleration= v^2/radius= w^2*radius= 4.2^2 * 12cm/s^2

physics
I bet it is 90degrees

Tcc
change speed to m/second, radius to meters tangential speed=angular velociyt*radius you are given tangential speed, radius, solve for angular velocity w radial acceleration= w^2*radius tangential acceleration: zero

Chemistry
remember that each atomic mass unit u is equivalent to 1.660538921×10−27 kg

Chemistry
mass deficit= 1*MHe4 - 4*Mh1 for the mass of these isotopes, use a mass isotope chart. http://www.chem.ualberta.ca/~massspec/atomic_mass_abund.pdf then, energy= massdeficit*c^2

Chemistry
1.4E10 what unit? days, hours, seconds?

Pyhsics
Weight per area is pressure, it is given as 100kPa/m^2 above. but this weight would equal density*volume*9.8N/kg, or density*1m^2*height*9.8 set that equal to 100kN/m^2, and solve for height.

Pyhsics
The sum of the heats gained is zero. HeatONE+HeatTWO=0 50*c*(Tf-17)+50*c*(Tf-44)=0 c divides out, solve for Tf. Actually, 50 divides out, so Tf= (17+44)/2

physics
assuming no energy loss thru the nozzle, which is a silly assumption... energy to raise water to 16m... Force*distance=energy= mgh netpressure*area*distance=mgh (P-100kN/m^2)*areastream*16m=areastream*16m*densitywater*g*16m (P-100kN/m^2)=16*densitywater*9.8N/kg P=16m*1E6kg/m^3...

College physics
distance=1/2 a t^2=1/2 force/mass *t^2 do the algebra, solve for mass. b. No friction? It moves forever at constant velocity. Maybe it ends up in Neverland, who knows.

physics
Field where? Due to the point charge and the rod? Is the charge on the rod uniform?

trig
consider the identity Sin(A+B)= then, look at the identties for double angles when A is 2Theta

Biology
DNA

physics
pressure on each side is the same. forcesmall*.60/areasmall= forcelarge/arealarge 15/pi*18^2=100/(pi*rl^2*.6) solve for rlarge.

5th grade math
yes, that is a good estimate

physics
break each component into N, E componsnts remember W is -E Then combine components. Then, find the resultant.

physic
Snell's law applies, I do no know which angle is 25deg

Math
n=INT n'= 100e^.02t +C I assume your e-.02t should have been e^.02t Now find C. You know 45=100e^0+C, so solve for C

Math
f=INT f= (2x-7)^6 + C now find C 3/2 = (2*4-7)^6 + C C=1/2

Physics
If it is expontenial, then A(t)=Ao*e^-t/T I assume you are looking for T .363=e^-7/T take ln of each side ln(.363)=-7/T solve for T

BILOGY
more sun (intensity and day length)=more photosynethesis earth tilted so trees point more directly to sun (ie seasons)=more sun

Educational Technology and Online Learning
absolutely correct. The entire purpose of a search is to take the billions of documents on the internet and condense them down to a few that will help you.

Math
9N+4U=159 9(2.5U)+ 4U=159 solve for U first, then solve for N

calculus
let u= (e^-x+(x))^-2 then du = -2/(e^-x+(x)) * (-e^-x+(1))dx which changes the integral to 1/2 u du or u^2

5th grade math
first one: what is 700/20 ? second one: what is 3600/30?

Logarithmic Algebra
log 6/25= log (3*2)/(5^2) = log 3 + log2 - 2 log5

Physics
work done by gravity=mgh=1/2 m v^2 + 1/2 I w^2 mgh= 1/2 mv^2 + 1/2 I v^2 r^2 given h, v, m, r, v, solve for I

chemistry
The net pressure on lungs is outside-inside. Exactly what pressure is on the inside? Normally, on scuba diving, the presssure regulator keeps the inside pressure the same as outside, so net pressure is nil, and the lungs do not collapse. One does not want lungs to collapse.

Math
What is 7*3*2*5?

trig
arc tan Theta= 50000/30000 theta = arc tan ( 5/3 )

English 9R - Civil Disobedience Essay Check (PLZ!)
<<Your stance on civil disobedience as a way to respond to an unjust law and effect change. Your opinion should develop a clear argument for/or against an individual's decision to take the law into his or her own hands.>> That is the assignment, you haven't...

English 9R - Civil Disobedience Essay Check (PLZ!)
Let me ask again: where is your opinion for/against an individuals decision...? You have described pretty well your packet of info, but not so well on your opinion and your arguements.

English 9R - Civil Disobedience Essay Check (PLZ!)
exactly where did you do any of this? <<Your stance on civil disobedience as a way to respond to an unjust law and effect change. Your opinion should develop a clear argument for/or against an individual's decision to take the law into his or her own hands.>>

English 9R - Civil Disobedience Essay Check (PLZ!)
My question is the same as MsSue's. The last sentence in the first paragraph needs some work... <<audacious civil disobedients who fought for what is right... ..daring civil disobedients who fought for that which they believed was right. The rest needs a lot of work,...

Memorable Letter Evaluation (Writeacher)
If I were your parents, I would be more interested in how you felt vs what you saw, and how it affected your life, not the beauty there. Parents did not send you there to send back picture postcards. They want to know the impact, and why you remember it.

Science
yes, that is the best answer, but a very poor answer. A pixel is the smallest picture element addressable on a picture, it is a specific location, and at that location associated with that location, is color, intensity.

MATH VERY URRRGENT!!!!!!!!!!!!!
random, without replacement.

physics
force*timeimpact= changemomentum force=1100*.06=.160V V=1100*.06/.160 m/s

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