Friday
September 19, 2014

Posts by Damon


Total # Posts: 18,540

science
The magnetic monopole is a much sought after object :)
July 12, 2014

science
http://cosmoquest.org/forum/showthread.php?91956-The-Moon-Specular-and-Diffuse-Reflection
July 12, 2014

science
It is called reverberation. See: http://www.wisegeek.com/what-is-a-reverberation.htm#didyouknowout
July 12, 2014

Math
You are welcome.
July 12, 2014

Math
to fit in the box the radius of a round pizza must be less than or equal to 6 inches A = 3.14159 * r^2 = 3.14159 * 36
July 12, 2014

PHYSICS
F * 100 / 80 = 200
July 12, 2014

chemistry step by step for me clearly
sorry 3 * 6 = 18 mols
July 12, 2014

chemistry step by step for me clearly
I have to assume you mean 2.684 grams of Al2(SO4)3 and water per cc. One of those grams is water so we have 1.684 grams of Al2(SO4)3 in every cc Al2(s04)3 How many grams per mol? 2 Al = 2 * 27 = 54 3 S = 3 * 32 = 12 O = 12 * 16 = 192 so Al2 (SO3)4 = 278 grams/mol If we have 1....
July 12, 2014

Physics
How fast can the stack accelerate without the books above the first one slipping? weight down on bottom book = 5 * 4 kg * g maximum static friction force between top 5 and bottom book = 5 * 4 * g * 0.3 so max force = mass of top 5 * a 5*4*g*.3 = 5*4 * a so a = .3 g that gives ...
July 11, 2014

electric circuit
Interesting, went nameless :)
July 11, 2014

Trigonometry
A(of L and w) = L * w if w = 1 then A(L) = L
July 10, 2014

stats
57.21% or .5721
July 10, 2014

stats
I think the same as the probability that one is more than 2.90 mean = 3 we are at .1 below mean Z = -.1/.55 = -.18 from normal table if Z = -.18 then F(z) about .421 so about 42% are below so about 58 % are above 2.9 For accurate table use http://davidmlane.com/hyperstat/...
July 10, 2014

error
arithmetic! (10*9*8)/(16*15*14) = .2143 1 - .2143 = .7857
July 10, 2014

Math
p = probability defective = 6/16 = .375 1 - p = 10/16 = .625 = probability good we do three trials on the box. They all must be good if it is to pass probability of first trial fuse good = 10/16 probability of second choice being good fuse = 9/15 third = 8/14 so probability of...
July 10, 2014

No picture
If you tried to copy and paste, that does not work here.
July 10, 2014

US Government
However in real life they seem to be closer to: http://www.constitutionparty.com/our-principles/key-issues/
July 10, 2014

US Government
http://www.modernwhig.org/handbook/who-are-modern-whigs/what-we-believe I suspect Republicans like to think they share these principles.
July 10, 2014

PHI 208 Week 4 Reading Quiz
Hard to tell.
July 10, 2014

Physics
F = q E = m a so a = (q/m)E = (1.6*10^-19/1.67*10^-27)5*10^2 = 4.79 * 10^10 m/s^2 v = a t 3.5*10^4 = 4.79 * 10^10 t t = .731 * 10^-6 = 7.31*10^-7 seconds d = (1/2) a t^2 Ke = (1/2) m v^2 I think you can do c and d
July 10, 2014

US Government
http://www.fec.gov/ans/answers_pac.shtml
July 10, 2014

physics
There is indeed a magnetic dipole which has field lines of the same shape as an electric charge dipole. We also use the dipole model in fluid physics combining a source and a sink close together which also has the same sort of streamlines. All are examples of moments, meaning ...
July 10, 2014

math
Here is a picture of a similar (no pun intended) problem http://mathforum.org/sanders/connectinggeometry/ch_09Similar.html
July 10, 2014

math
No hypotenuse is necessary. We are looking at corresponding sides of similar triangles here 3/4 = h/20 so 4 h = 4 * 5 *3 h = 15
July 10, 2014

Statistics/Probability
http://davidmlane.com/hyperstat/z_table.html
July 10, 2014

algebra2
You are making as mountain out of a mole hill: 2x + 4 = 3x - 12
July 10, 2014

Physics- help please
q is the electron charge -1.6*10^-19 Coulombs You are supposed to know that, The charge on a proton is equal and opposite in sign.
July 10, 2014

Physics
v (t+2) = (1/2) a t^2
July 10, 2014

math
y = (3/5) x + b -4 = (3/5)(2) + b b = -20/5 - 6/5 = -26/5 y = (3/5) x - 26/5 5 y = 3 x - 26
July 10, 2014

math
m = (-5 - 1)/(2-4) = 3 m' = -1/m = -1/3 y = -x/3 + b find point on original line halfway between x = (4 +2 )/2 = 3 y = (1 - 5)/2 = -2 so -2 = -3/3 + b b = -1 so y = -x/3 - 1 3 y = -x - 3
July 10, 2014

business
8%/4 = 2% per quarter so every three months multiply by 1.02 25 * 1.02^n = 45 1.02^n = 1.8 n log 1.02 = log 1.8 n = 29.68 quarters or 7.42 years
July 9, 2014

Urgent Calculus Help 2
You are welcome.
July 9, 2014

Urgent Calculus Help 2
dy/dx = 6x d/dx [ln(x+4)]+ 6 ln(x+4) = 6 x /(x+4) + 6 ln(x+4) so at x = 2 dy/dx = slope = m = 12/ln(6) + 6 ln (6) but ln (6) = 1.79 so use that to find the slope m then we have y = m x + b and we know m find y at x = 2 y= 12 (1.79) = 21.5 so use that 21.5 = 2 m + b we know m, ...
July 9, 2014

Urgent Calculus Help
h' = df/dg * dg/dx at x = 2 dg/dx = -2 and g = 7 df/dg at g = 7 = -8 so -8 * -2 = + 16 that is how, you do the next
July 9, 2014

ph
For heaven's sake do what Ms Sue suggested. For me pH means acid or base. Stop wasting teacher time. We are volunteers here and you need someone who does prescriptions, not a physicist or historian. I have a sneaking suspicion you mean 250 milligrams every 8 hours for 7 ...
July 8, 2014

physics
soft spring ---> slower vibration which means longer period. You knew that. 2 pi sqrt (m/k)
July 8, 2014

physics
Northeast 65 sqrt 2 = 91.9 N
July 8, 2014

Physics
Potential energy drop = m g h =90*9.81*100 = 88,290 Joules Kinetic energy = (1/2) m v^2 = 45(900) = 40,500 Joules so loss to heat = difference = 47,790 Joules
July 8, 2014

Science
It means that there is 1/4 mol of oxalic acid in every liter of the stuff and the rest is water.
July 8, 2014

TYPO
g = -32 ft/s^2 it is -32/2 which is -16 and h(2) = (1/2)(-32) t^2 + 36 t + 4 h(2) = -16 (2)^2 + 36 (2) + 4 h(2) = -64 + 72 + 4 h(2) = 12 feet
July 8, 2014

Algebra
outside dimensions are 10+2w and 16+2w total area = 160 + 52 w + 4 w^2 pool area = 160 so sidewalk area = 4 w^2 + 52 w = 155 4 w^2 + 52 w -155 = 0 (2w-5)(2w+31) = 0 w = 5/2 = 2.5 ft
July 8, 2014

Physics
330 cos 15 = Vwest - 65 330 sin 15 = Vsouth so Vwest = 383.7 km/h Vsouth = 85.4 km/hr Vplane = sqrt (383.7^2+85.4*2) tan angle south of west = 85.4/383.7
July 8, 2014

Algebra
NO !!!!!! a straight line with y = m x + b with m negative so negative slope would satisfy answer A but the slope of these points is NOT constant
July 7, 2014

Algebra
try y = k/x for (2,30) 30 = k/2 k = 60 for (5,12) 12 = k/5 k = 60 sure enough x*y always = 60 (answer C)
July 7, 2014

Algebra
slope = change in y / change in x the change in y will not be constant unless you pick evenly spaced x values (the same changes in x) if change in y is constant for evenly spaced x values then the slope is constant so it is a straight line.
July 7, 2014

phys
Yes, assuming they are the same mass.
July 7, 2014

phys
V = x^3 dV = 3 x^2 dx dV/V = 3 x^2 dx/x^3 = 3 dx/x ah ha, C
July 7, 2014

algebra
well, look after a year .5*1.06 + .5*1.08 = 1.07 1 * 1.07 = 1.07 look after 5 years .5(1.06)^5 + .5(1.08)^5 = 1.403776827 1.07^5 =1.402551731 less look after 20 years .5*1.06^20 + .5*1.08^20 = 3.9340463 1.07^20 = 3.869684462 less Tasha wins because the 8% half makes the Tasha ...
July 7, 2014

algebra
I do not see the statements .5*(1.06)^n + .5(1.08)^n compared to 1 * (1.07)^n
July 7, 2014

Algebra
You are welcome.
July 7, 2014

Algebra
Well, that is a parabola. Where is the vertex? -16 t^2 + 48 t = h 16 t^2 - 48 t = -h t^2 - 3 t = -(1/16)h t^2 - 3 t + 9/4 = -(1/16)h + 9/4 (t - 3/2)^2 = -(1/16)(h - 36) ah ha, hits the vertex at the top when t = 1.5 seconds and h = 36 feet
July 7, 2014

calculus
y = -4 t^2 -t - 6 slope = dy/dt = -8 t - 1 at t = 8, slope = -65 so our tangent line is of form y = -65 t + b to find b, we need a point on the line when t = 8, y = -4(64) -8 -6 = -270 so use that point (8, -270) to find b -270 = -65(8) + b b = 250 so in the end y = -65 t + 250
July 7, 2014

Math
divide (-4/5) by two so -2/5 square that 4/25 add it b^2 -(4/5) b + 4/25 which is (b-2/5)^2
July 7, 2014

English Essay Part 2
Cynthia, I am so happy **that** you **** moved back to Athens. I spoke to your mom the other day.*** She told me **that** you were looking for a job. ** I know you *** worked as a cashier and a sales clerk **recently**. Therefore, I have a very special offer for you. **** I ...
July 7, 2014

Math
299
July 7, 2014

Electro 1
r = R1 R2 / (R1+R2) = 1.95*.05 /2 = .04875 In other words if connected in parallel, the .05 resistor carries practically all the current. V = 50 *.04875 = 2.4375 volts i through .05 = 2.4375/.05 = 48.75 amps i through 1.95 = 2.4375/1.95 = 1.25 amps
July 7, 2014

Electro 1
I assume the wires are in series with the load, leading to the + and - sides of the power source. total R = 6.5 ohms i = V/R = 119.6 / 6.5 = 18.4 amps V = i R = 18.4 * 6 = 110.4 volts across 6 ohm load V = i R = 18.4 * .25 = 4.6 volts across each of the two wires.
July 7, 2014

PHYSICS
F = m a 100,000 = m of ten * 2 m of ten = 50,000 kg so m of one = 5,000 kg F = m a = 5,000 * 2 = 10,000 Newtons
July 7, 2014

Calculus
Yes. The integral of the acceleration vector is the velocity vector. The constant of integration is determined by a known velocity, often the initial velocity. The integral of velocity is displacement. Constant of integration is determined by initial position (zero here) to ...
July 6, 2014

algebra
anything at all to the zero power is one.
July 6, 2014

calc
I assume both are in x, y and not three D or you would have shown 0 in y for the first and 0 in z for the second first vector: x = -82.2 + 0.2 s y = +43.0 + 1.7 s second vector: x = -84.4 + 2.4 t y = +45.5 - 0.9 t do they hit? -82.2 + .2 s = -84.4 + 2.4 t or 2.4 t - .2 s = 2.2...
July 6, 2014

Math
term 1 = a = 28 term 2 = a r term 3 = a r^2 term 8 = a r^7 = -7/32 28 r^7 = -7/32 r^7 = -1/(4*32) r^7 = -1/2^7 r = -1/2
July 6, 2014

PHYSICS
You did not ask any question.
July 6, 2014

PHYSICS
dx/dt = 28.2/9.4 = 3 cm/s for the whole trip dx/dt = (11-2.9)/(3.3-.6) = 3 cm/s for part of the trip so I suspect constant velocity of 3 cm/s or 0.03 m/s
July 6, 2014

PHYSICS
see below
July 6, 2014

PHYSICS
Hey, do it the same way.
July 6, 2014

PHYSICS
east components (x direction): -50 -25 sin 30 = -50 -12.5 = -62.5 north components (y direction) -30 - 25 cos 30 = -30 - 21.7 = -51.7 d = sqrt (62.5^2 + 51.7^2) tan angle west of south = 62.5/51.7
July 6, 2014

Physics
use law of cosines a = 95 b = 150 c = 190 c^2 = a^2 + b^2 - 2 a b cos C 36100 = 9025 + 22500 - 28500 cos C 28500 cos C = -4575 cos C = -.16053 C = 99.2 degrees now use law of sine to find the next one
July 6, 2014

Math
x = 1 and y = 10 -->1-.1 = .9 try others x = 2 and y =9 --> 1/2 - 1/9 see?
July 5, 2014

SCIENCE
70 = m v^2/r 70 = 70 (35)^2 /r r = 35^2 = 1225 http://www.jiskha.com/m
July 5, 2014

Algebra
do you mean (8n+8) ?????
July 5, 2014

Algebra
y - -1 (x^2 - 8 x + 16) + 2 y = -x^2 + 8 x - 16 + 2 y = -x^2 + 8 x - 14
July 5, 2014

uos
You problem does not make sense to me. If it slides down a vertical distance of .4 meters then we can calculate the kinetic energy (1/2) m v^2 = m g h (1/2)(2)v^2 = 20 (.4) = 8 Joules, not 60 joules. Moreover you asked for nothing, just stated impossible facts.
July 5, 2014

Mathematics
(2 pi r)(35/60)
July 5, 2014

vocabulary
You are welcome.
July 5, 2014

vocabulary
Yes
July 5, 2014

vocabulary
Do you not associate imagery with mental pictures?
July 5, 2014

vocabulary
No.
July 5, 2014

PHYSICS
Well, force is rate of change of momentum or m A if the mass is constant, so what is the change of momentum? original momentum of driver = 52 *14 = 588 kg m/s final momentum of driver = 0 so change = -588 kg m/s How long did it take? average speed during crash = 14/2 = 7 m/s ...
July 5, 2014

compound interest
.06/12 = .005 = interest rate/month so multiply by 1.005 every month for 12 months 3500 * 1.005^12 = 3715.87
July 5, 2014

physics
Exactly, you figured it out. The man would have to pull farther (more parts in the tackle), like maybe eight times as far at 1/5 the weight
July 5, 2014

Soil Chemistry
http://www.amnh.org/exhibitions/permanent-exhibitions/rose-center-for-earth-and-space/david-s.-and-ruth-l.-gottesman-hall-of-planet-earth/what-causes-climate-and-climate-change/the-atmosphere/greenhouse-gases-a-troposphere-story
July 5, 2014

Soil Chemistry
most outgoing infrared is absorbed in the troposphere before reaching the stratosphere.
July 5, 2014

Math
10 (180-alpha) = 360 all the way around the outside 180 - alpha = 36 alpha = 144
July 4, 2014

Calculus
r = (5/8) x V = (1/3) pi [ (5/8) x ]^2 x V = (1/3) pi (25/64) x^3 etc
July 4, 2014

Algebra
sketch a graph !!!!
July 3, 2014

physics
I did #1 #2 potential energy lost = m g h potential energy gained = (1/2) k x^2 for 40 kg 40 * 9.81 * (1+x) = (1/2)(12,000) x^2 solve quadratic for x #3 I have no idea because you did not tell me ratio of bounces
July 3, 2014

ACCOUNTING
is the sum of your liabilities and ownership equity not your assets? so equity = assets - liabilities
July 3, 2014

chemistry
P V = n R T T = 16 + 273 V = 10 L = .01 m^3 n of O2 = 51.4/32 n of He = 32.5/4 calculate P of each then add to get total
July 3, 2014

Urgent Calculus Help
slope is always positive the slope keeps increasing so second derivative is positive
July 3, 2014

Urgent Calculus Help
Sketch a graph of this function. Then the answers will be obvious.
July 3, 2014

Algebra
x + (x-6) = 50 2 x - 6 = 50 2 x = 56 x = 28
July 3, 2014

Physics
m g h is the same small m needs big h Sumo seems to be 20 times as massive as the ball :
July 3, 2014

Physics -- check answers please
1. ok m g h = 20 * 10 * 2 Joules 2. No. That 400 Joules of potential energy becomes 400 Joules of kinetic energy during the fall. 3. Yes - At maximum stretch the ball stops. The ball is now 2 meters plus x below the starting point where x is the stretch distance down. The ...
July 3, 2014

Social Studies
NY heeft geen Nederlanders? Ik geloof het niet :)
July 3, 2014

American national government
separate educational facilities were inherently unequal
July 3, 2014

Physics
no constant the force increases as the spring stretches F = k x work = k x^2/2 ======================== momentum increases an external force, mg
July 3, 2014

Science
rot fungus http://en.wikipedia.org/wiki/Wood-decay_fungus
July 3, 2014

Calculus 1
A = 4 pi r^2 r = D/2 so A = 4 pi D^2/4 = pi D^2 dA/dD = 2 pi D dA/dt = 2 pi dD/dt 1 = 2 pi dD/dt dD/dt = 1/(2pi)
July 3, 2014

arithmetic
Never buy fish from a farm. Farmed fish is yuucky. Good fish comes from the ocean. lets start with 40 fish the first week 5 die so we have 35 which is 7/8 of original after first week 7/8 or 35 remain then in weeks two and three 3/5* 35 = 21 die so we are left with 35 -21 = 14...
July 3, 2014

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