Tuesday
September 2, 2014

Posts by Damon


Total # Posts: 18,220

science (check)
Yes, but the individuals may be fish or whatever.
March 28, 2014

Math for grade 6 peace
96 = 0.48 x x = 96/0.48
March 28, 2014

Physics
Take moment about the left end total mass = 20 + 14 + 39 = 73 kg That is force up from pivot (I am going to do force in kilograms because g will cancel everywhere.) pivot distance from left = 1.4 Distance left to 39 kg = x (our L is (x -1.4) ) moments about left end 14 * 0 - ...
March 28, 2014

science
distance = speed * time same time, higher speed --> bigger distance
March 27, 2014

Math
x + 15 + 2x + 27 = 180 3 x = 138 x = 46
March 27, 2014

math help!!
[ (x^2+5x) - 6 ] [(x^2+5x) + 6 ] (x^2 + 5 x - 6) (x^2 + 5x + 6) now if the back of your book says (x^2 + 5 x + 6)( x^2 + 5 x - 6) That is the SAME
March 27, 2014

math help!!
You got the second one, just reversed x y = y x !
March 27, 2014

geometry
width of alley = 60 tan 40 so second building = 60 + 60 tan^2 40 =60 (1 + tan^2 40) = 110 ft
March 27, 2014

geometry
ratio of ANY lengths in similar figures is the same 12/16 = 3/4 2. Ratios of ANY areas is length ratio squared 9/16 3. 54 * 16/9 = 96
March 27, 2014

math help
That is exactly what we got x y = y x the order is just reversed
March 27, 2014

math help
LOL, no need for wolfram !
March 27, 2014

math help
remember - -d = + d
March 27, 2014

math help
[ (a-b) - (c-d) ] - [ (a-b) + (c-d) ] [ a - b - c + d ] [ a - b + c - d ]
March 27, 2014

Calculus Help Please!!!
One of us made an arithmetic mistake. It is up to Tanya to get it right :)
March 27, 2014

Calculus Help Please!!!
rate of change of temp proportional to temp above room temp which is 20 to make it easy on the arithmetic define T' = real T - 20 dT'/dt = k (T') dT/T' = k dt ln T' = k t T' = C e^kt let's call t = 0 at 1:30 T = 32.5 so T' = 12.5 12.5 = C e^0 = ...
March 27, 2014

Calculus Help Please!!!
I am going to assume it is algebra first take t = 0 at 1:30 T = Ti - k t Ti = 32.5 so T = 32.5 - k t 30.3 = 32.5 - k (1 hour) k = 2.2 so T = 32.5 - 2.2 t 37 = 32.5 - 2.2 t t = - 2.04 call it 2 hours so by that linear model 11:30 am now I will work on the more realistic ...
March 27, 2014

Calculus Help Please!!!
Are you sure this is calculus? You want exponential decay to room temp? Or is it algebra and you want a linear function?
March 27, 2014

math
Yes !!! You got it. even the -1 * -1 = + 1 part
March 27, 2014

math
sorry about the caps, was doing tax returns with caps lock on
March 27, 2014

math
yOU HAVE [X - [Y-Z) ] THAT IS [ X - Y - NEGATIVE Z ] - A NEGATIVE IS POSITIVE [ X -Y PLUS Z ]
March 27, 2014

math
x^2-(y - z)^2 exactly the same way let a = x let b = y-z now you have a^2-b^2 = (a-b)(a+b) so [x -(y-z) ] [ x + (y-z) ] (x-y+z)(x+y-z) you were close
March 27, 2014

math
let x = (a-b) let y = c then you have x^2 - y^2 = (x-y)(x+y) now put in (a-b) for x and put in c for y
March 27, 2014

physics
the only one that lacks serious damping is the light in a vacuum.
March 27, 2014

Chemistry URGENT
I see nothing wrong with them.
March 27, 2014

Chemistry URGENT
Oh, divide by 2 C6 H10 O5 + 6 O2 ---> 6CO2 + 5 H2O
March 27, 2014

Chemistry URGENT
C6 H10 O5 + O2 ---> CO2 + H2O we need an even number of O atoms 2 C6 H10 O5 + x O2 ---> 12CO2 + 10 H2O now O balance 10 + 2x = 24 + 10 x = 12 2 C6 H10 O5 + 12 O2 ---> 12CO2 + 10 H2O
March 27, 2014

MATH WORD PROBLEM
b+c = 420 so c = 420 - b c = (3/4) b so 3 b/4 = 420 - b 3 b = 1680 - 4 b 7 b = 1680 b = 240 bears total b = sb + bb but bb = (9/7)sb so 240 = sb +(9/7) sb = (16/7)sb sb = 105 small bears bb = 240 - 105 = 136 big bears I will leave the last part for you
March 27, 2014

Chemistry
2 * 7.9 = 15.8 mols C 15.8 * 12 g/mol = 189.6 grams of carbon
March 27, 2014

whoops
we got carbon as a result of step 2 so we could put it back in to step 1 then we would only need two carbons fo each CaCO3
March 27, 2014

Chemistry
In the end for the carbon 3 C --> CO + C + CaCO3 so in the end we need 3 C atoms for every molecule of CaCO3 C = 12 g Ca = 40 g 3O = 3*16 = 48 g so CaCO3 = 100 g/mol so we get 7.90 mols of CaCO3 for that we need 3*7.9 = 23.7 mols of C 23.7 * 12 = 284.4 grams of Carbon
March 27, 2014

WORD PROBLEMS UGH
kiwi need 336 * 6/8 = 252 fruits mango needs 336*3/5 = 202 fruits strawberries 336*5 = 1680 fruits total fruits = 2134
March 27, 2014

algebra
186 n + 30 ???? so what is the question?
March 27, 2014

Math please check my answer?
You are welcome :)
March 27, 2014

Math please check my answer?
By the way: https://www.wolframalpha.com/input/?i=e^%28x-4%29-2+
March 27, 2014

Math please check my answer?
again it has a horizontal asymptote of y = -2 as x--->-oo but is defined for all real x so yes, range is all real x
March 27, 2014

math
There is no sure answer since there is not a constant number of leaves per inch 2/3 = .67 leaves/inch 14/15 = .933 leaves /inch so 6 * .67 = 4.02 6 *.933 = 5.6 leaves per inch so probably more than four and less than 6 try 5 also see: http://www.jiskha.com/display.cgi?id=...
March 27, 2014

Math
yes, all real numbers again
March 27, 2014

Math
yes, all real numbers
March 27, 2014

Physics
well, I used 1000 for rho before I saw the hint so you use 1060 rho g h=1000*9.81*.496 = 4.86* 10^3 Pa which is 4.86 k Pa 15.02 - 4.86 = 10.15 k Pa rho g h = 1000*9.81*1.3 = 12.75 k Pa 15.02 + 12.75 = 27.8 k Pa
March 27, 2014

algebra
V = pi r^2 h = pi (D^2/4) H
March 27, 2014

Math
None of the functions you have listed seem to have zero denominators. This function has a horizontal asymptote at y = -1 as x --->-oo but is defined for all real x
March 27, 2014

physics
power = work/time = (25000+800)(30)/60 = 12,900 Watts or about 13 KW
March 27, 2014

Math
sign error add 37 x to both sides f(x) = 37 x + 82
March 27, 2014

Calculus
best use radians, pi/2
March 27, 2014

History
I think she quoted the Preamble to the Constitution.
March 27, 2014

physics
m1 = 40.4 x1 = 0.00 y1 = .403 m2 = 15.2 x2 = .158 y2 = 0.00 m3 = 9.49 x3 = 0.48 y3 = -.210 m = 65.09 kg x cg = [40.4*0+15.2*.158+9.49*.48]/65.09 = 0.107 m y cg =[40.4*.403+15.2*0+9.49*-.21]/65.09 = 0.22 m
March 27, 2014

physics
m=M/10^30 4.19*1.75 = m*(7.78-1.75) = m * 6.03 so m = 1.22 so m = 1.22 * 10^30 kg
March 27, 2014

Math ~ Check 1 Answer ~
You are welcome.
March 27, 2014

Math ~ Check 1 Answer ~
agree
March 27, 2014

math
a^2 + (a+1.05)^2 = 59^2 a^2 + a^2 + 2.1 a + 1.1025 = 3481 2 a^2 + 2.1 a = 3480 a^2 + 1.05 a - 1740 = 0 https://www.wolframalpha.com/input/?i=a^2+%2B+1.05+a+-+1740 a = 41.2 b = 42.2
March 27, 2014

physics
initial momentum = .00626*344 = 2.15 2.15 = .00626 Vb1 + 1.205*.673 Vb1 = 214 m/s exiting first block bullet momentum entering second = .00626*214 = 1.34 1.34 = 1.584 v v = .846 m/s (a) (b)final = (1/2)(1.584)(.846^2) = .567 Joules initial = (1/2)(.00626)(344)^2 =370 ratio = ....
March 27, 2014

physics
77.1 v = .0593 (.263) v = .000202 m/s better look fast because that blood circles around again in the body, reversing momentum :)
March 27, 2014

Social Studies
The way I read it: because accepting heliocentrism implied that the Bible was inaccurate since the Bible seems to support geocentrism
March 27, 2014

Social Studies
Agree about discontented citizens in France. steps?
March 27, 2014

Social Studies
The whole paragraph is about individual rights. It is not about tyranny of the majority,
March 27, 2014

World History
https://www.mtholyoke.edu/courses/rschwart/hist255/kat_anna/napoleon.html
March 27, 2014

World History
They wrecked the democracy. Napoleon just stepped in.
March 27, 2014

World History
No, D
March 27, 2014

World History
The Jacobins were world renowned radicals who turned the French revolution into chaos resulting in the Napoleonic wars and his rise to dictatorship and empire. https://www.mtholyoke.edu/courses/rschwart/hist255/kat_anna/jacobins.html
March 27, 2014

Physics
negligible :) F = G M1 M2 / d^2 F = 6.67 * 10^-11 * 443 * 356 /11.56 F = 91,000 *10^-11 = 9.1 *10^-7 Newtons
March 27, 2014

physics
F = 9*10^9 Q1 Q2 /.16
March 27, 2014

math
Math - Damon, Thursday, March 27, 2014 at 11:57am A wrong .02 * .4 = .008 B wrong .03 * .4 = .012 C wrong .05 * .2 = .01 total wrong = .03 C wrong/total wrong = .01/.03 = .33
March 27, 2014

look below
I just did that
March 27, 2014

Math
A wrong .02 * .4 = .008 B wrong .03 * .4 = .012 C wrong .05 * .2 = .01 total wrong = .03 C wrong/total wrong = .01/.03 = .33
March 27, 2014

Math
x + 210 = 630 x = 420
March 27, 2014

History
Only the second choice makes any sense at all. It worked for Peter the Great.
March 27, 2014

same question again ?
http://www.jiskha.com/display.cgi?id=1395933159
March 27, 2014

statistics
9 people probability of man first = 5/9 then prob of woman = 4/8 so 20/72 for man then woman then probability of woman first = 4/9 then prob of man = 5/8 so 20/72 again add them 40/72 = .55
March 27, 2014

physic
m g = weight = 2*9.81 = 19.62 N static friction max = .8*19.62 = 15.7 N kinetic friction = .65*19.62 = 12.8 N 5 N does not move it. Friction resists with 5 N by third law F - 12.8 = 2 (1.5) F = 15.8 N to get 1.5 m/s^3 acceleration, it is moving now so friction force is -12.8 ...
March 27, 2014

Algebra 2
[ (x-y)(x+2y) ] / [(x+2y)(x+y) ] = (x-y)/(x+y)
March 27, 2014

Equation help
x = [ 6 +/-sqrt(36 -28) ]/2 = 3 +/- sqrt2 = 1.59 , 4.41 number 4
March 27, 2014

I did this about ten minutes ago
Simplify the rational expression (x^2+xy-2y^2)/(x^2+3xy+2y^2) Algebra 2 - Damon, Thursday, March 27, 2014 at 11:04am [ (x-y)(x+2y) ] / [(x+2y)(x+y) ] = (x-y)/(x+y)
March 27, 2014

Dimensionless parameters
You are welcome :)
March 27, 2014

Dimensionless parameters
By the way if gravity had been important (waves), we would have also found the Froude number v/sqrt(gL)
March 27, 2014

Dimensionless parameters
d/H had better be the same for model and experiment If viscosity were important then rho vL/mu, the dimensionless Reynolds number should be the same, but the problem statement says mu is not important so we are left with d/H and the ratio of force to other parameters which we ...
March 27, 2014

CALCULUS problem
int x^-3 dx = -.5 x^-2 + c at x = 3 = -.5/9 at x = 1 = -.5 so A = .5 - .5/9 = .5(8/9) = 4/9 B at x = h int = -.5/h^2 right half = -.5/9 +.5/h^2 left half = -.5 h^2 +.5 so -.5 h^2 + .5 = -5/9 +.5/h^2 1/h^2 = .5 + 5/9 = 4.5/9 + 5/9 = 9.5/9 = 19/18 int 1 to 3 of pi (x^-6)dx = -pi...
March 27, 2014

who dare to give the answer!
I not only do not dare, I do not have the slightest idea what you are talking about.
March 27, 2014

Math
I am not familiar with the notation but what happens is (x , y) --->(x , -y) so I would choose C.
March 27, 2014

makes no sense
Please check what you typed.
March 27, 2014

typo
same volume both times
March 27, 2014

maths
p = 2000 + 100 x - 6 x^2 if x = 25 p = 2000 + 2500 - 3750 p = 750 not a wise decision unless there is a typo
March 27, 2014

math
Well, let's hope we are right :)
March 27, 2014

math
surface area = 4 pi r^2 so dv/dt = 4 pi r^2 dr/dt dv/dt = 75 cm^3/s so dr/dt = 75/(4 pi r^2) when r = 5 dr/dt = 3/(4 pi) = .75/pi cm/s after 60 seconds volume = 75*60 = 4500 cm^3 (4/3)pi r^3 = 4500 pi r^3 = 3375 r = 15/pi^(1/3) r^2 = 225/pi^(2/3) 4 pi r^2 = 900 pi^(1/3) dr/dt...
March 27, 2014

social study
http://gloucester-ma.gov/index.aspx?nid=649
March 27, 2014

social study
here's one here: http://wgbhnews.org/post/wind-turbines-power-gloucester-city-buildings
March 27, 2014

Calculus
huh?
March 27, 2014

Calculus
x = ln 243 y = ln 32 LET Z = e^((3x + 4y)/5) ln [z ]= (3x+4y)/5 ln z = (1/5)( 3 ln 243 + 4 ln 32) = ln (243^3/5 *32^4/5) = ln (27*16) = ln(432) if ln z = ln 432 then z = 432
March 27, 2014

physics
v = Vi -7.1 t 0 = 43 - 7.1 t t = 43/7.1 = 6.06 s average speed during stop = 7.1 /2 =3.55 m/s d = 3.55 * 6.06 = 21.5 m
March 27, 2014

Physics Help
Pairs of forces probably refers to Newton's third law, for every force there is an equal and opposite force.
March 27, 2014

Physics Help
Impulse is mass times change in velocity because Force * time = change of momentum = change of m v = m * change of v if m is constant
March 27, 2014

physics
potential energy of each at start = k q^2/r at large distance that energy is kinetic so (1/2)m v^2 = k q^2/r
March 27, 2014

Chemistry
ml ranges from -L to +L If L = 0, ml = 0
March 26, 2014

Chemistry
4 is out because with L = 0 you have no choice of ml = 1. wtih L = 0 ml = 0 and spin can be 1/2 or -1/2 ml = 1 is not allowed if L = 0
March 26, 2014

Chemistry
3) is out, spin is =/- 1/2 1) is out, negative L 2) is out , biggest L is n-1 or 2 4) is out, with L=0 you only have +/- 1/2 for spin, no ml - 1 5) looks possible 6) looks possible
March 26, 2014

Alegbra
You are welcome :)
March 26, 2014

Alegbra
Yes, right :)
March 26, 2014

Alegbra
LOL -1/3 = -0.33333333333333333
March 26, 2014

Alegbra
It would really help you if you sketched these points on a graph, or at least the x values on a number line.
March 26, 2014

Alegbra
from G to H x goes from 3 to -2 or -5 easier for me to go (1/3) of 5 from H to G so -2 + 5/3 which is -6/3 + 5/3 or x = -1/3
March 26, 2014

Alegbra
You are welcome.
March 26, 2014

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