Tuesday
September 23, 2014

Posts by Damon


Total # Posts: 18,627

world history
That is corrct.
May 1, 2014

Physics
P V = NRT = constant if n and T constant so P1 V1 = P2 V2 if V2 is half V1 then P2 is TWICE P1 difference in pressure from one side of piston to the other = 1 atm which is about 10^5 Pascals or Newtons.m^2 F = P A = 10^5 newtons.m^2 * pi .23^2 / 4
May 1, 2014

Math
For example (-1,-3/4) (4,-3/4) (4,3) (-1,3)
May 1, 2014

Physic II
Nothing happens with 100% efficiency
April 30, 2014

Physics ? geometry
I do not know V, the initial Volume of gas so can not do the problemP V = n R T P dV + V dP = 0 if n R and T do not change P initial = 10^5 Newtons/m^2 ( or Pacals) dV = (24*10^-4) x V = I have no idea. You left this out. dP = 5*9.81/(24*10^-4)
April 30, 2014

physics
Ke = (1/2) m v^2 + (1/2) I omega^2 v = omega r so omega = v/r Ke = (1/2) m v^2 + (1/2) I v^2/r^2 = m g (.25) (1/2) m v^2 + (1/2) (2/5) m v^2 = .25 m g (7/10) v^2 = .25 * 9.81
April 30, 2014

geometry
17 * 17 * 1/6 = 48.167 ft^3 1 yd^3 = 3*3*3 = 27 ft^3 48.167 ft^3/27 ft^3/yd^3 = 1.784 yd^3 1.784 yd^3 * $ 40/ yd^3 = $ 71.36 by the way, concrete people refer to a cubic yard as a "yard". They are not likely to send a truck with 1.784 yards, so you will pay for 2 ...
April 29, 2014

English
A is wrong. you're means "you are" not "your".
April 29, 2014

Calculus Help and Check
calculate C' = dC/dx at x = 2000 then dC = C' dx dC = C' (4000-2000) C' = 3 - 20 + 40 = 23 dC = 23 (2000) = 46,000
April 29, 2014

Physics
.6 seconds is quarter period so period = .6*4 = 2.4 s
April 29, 2014

Physics
(1/2) m Vmax^2 if x = a sin w t v = a w cos wt so Vmax = a w a is amplitude w is circular frequency = 2 pi f so Ke max = (1/2) m (a^2 w^2) = 2 pi^2 m a^2 f^2
April 29, 2014

Math
Perhaps they want us to assume it is possible. 4 out of the 15 sides are less than 5 so about 4/15 in each roll so in each roll the probability of NOT getting less than 5 is 11/15 so the probability of NEVER getting less than 5 is (11/15)^45 so our answer is 1 - (11/15)^45 ...
April 29, 2014

Math
The concept of a 15 sided cube startles me. Did you make this question up yourself?
April 29, 2014

social studies 9
What country?
April 29, 2014

Math
Hector cash = 450 + 20 t Tim cash = 1200 - 30 t Are you interested in how many weeks until they are equal? If so 1200 - 30 t = 450 + 20 t 50 t = 1200-450 t = 15 weeks
April 29, 2014

Physics
(1/2) m v^2 = potential energy potential energy is mgh for low altitude but that will not work for high altitude where g is less than 9.81 m/s^2 increase in potential = G M m (1/Re - 1/(Re+h) call z = Re +h (1/2) v^2 = G M (1/Re - 1/z) solve for z then h = z - Re
April 29, 2014

Physics
v^2/r = 8.26 F/m = local g = G M/r^2 = 8.26 6.67*10^-11 * Mass earth/r^2 = 8.26 solve that for r then v^2 = 8.26 r solve for v v T = 2 pi r T = 2 pi r/v
April 29, 2014

history
http://www.ers.usda.gov/data-products/farm-income-and-wealth-statistics/ranking-net-value-and-farm-income.aspx
April 29, 2014

math
The dimensions are divisible by 6 except 15 so the cubes will fit exactly on the bottom area of 30*18 = 6*6 *15 so 15 cubes covers 30*18 now it can only be 2 cubes high because of the 15 inch height limitation so 15*2 = 30 cubes
April 29, 2014

calculus
Hey, this is getting a little silly.6x+30 = 6 (x+5) and 3 (x^2-25) = 3 (x+5)(x-5) I think you better forget the calculus and work on basic factoring.
April 29, 2014

calculus
(x-3) cancels top and bottom
April 29, 2014

calculus
I am sure you mean (x^2-1)/(5x+5 ) again factor x+1 cancels
April 29, 2014

Information Literacy
Building Design 27 July 2012 Note: It is real: http://www.bdonline.co.uk/buildings/london-2012-olympic-park/5040360.article
April 29, 2014

Algebra
x^2 + (x+4)^2 = 18^2 = 324 2 x^2 + 8 x + 16 = 324 2 x^2 + 8 x - 308 = 0 x^2 + 4 x -154 = 0 x = [ -4 +/- sqrt (16 + 616)]/2 = [-4 +/- 2 sqrt 158 ] /2 = -2 +/- sqrt 158 use + root 10.57 14.57
April 29, 2014

maths
I do not know any trick, sorry 9.45 * 10^12
April 29, 2014

physics
m g = 1500* 9.81 m g sin theta = 1500 * 9.81 * sin 2 = 514 N propulsive force Power = force * speed = 514 N * 20 m/s = 10.27 KW
April 29, 2014

precalc
arrgh, English units :( r = (11/12) ft 2 pi r = 5.76 ft/revolution 600 revolutions/min * 60 min/hr =36,000 rev/hr 36,000 rev/hr * 5.76 ft/rev = 207,360 ft/hr 207,360 ft/hr * 1 mile/5280 ft = 39.3 miles/hr
April 29, 2014

precalc
45 * 2 pi radians/min = omega v = omega r v = 45*2 pi * 16
April 29, 2014

precalc
(35 +30) * pi/180 radians times r = distance
April 29, 2014

precalc
Now wait a minute. You can look this up in your text or sketch it out on paper. There is no need to ask me. for example area of sector = (angle/2pi)area of circle I am sure you can do that isoceles triangle in there push down clutch, engage gears :)
April 29, 2014

Math
5/1.25 = x/6 x = 30/1.25
April 29, 2014

chemistry
If it is BASIC, it has an H+ concentration LESS than 10^-7 This is an acid !
April 29, 2014

math
g / (g/hr) ---> hr
April 29, 2014

math
gallons per hour hours time = total gallons / rate in gallons per hour
April 29, 2014

phisics - no problem/ no copy and paste
You can not copy and paste here
April 29, 2014

math
V = pi r^2 h = pi (4)(9) = 113 s^3 = 113 s = 4.84 cm
April 28, 2014

Algebra
2*2*2 = 8
April 28, 2014

Algebra
i = .089/2 = .0445 X = 35,000 (1.0445)^(2t)
April 28, 2014

College Algebra
w = c L^3 w = c [512] [ (1-e^-t)^3 ] = 512 c ----------- aside multiplication problem (1-e^-t)^3 = (1-e^-t)(1 - 2e^-t +e^-2t) =1(1 - 2e^-t +e^-2t) -e^-t(1 - 2e^-t +e^-2t) = 1 - 2e^-t +e^-2t -e^-t +2e^-2t -e^-3t = 1 -3e^-t +3e^-2t -e^-3t ------------------ w = 512 c [1 -3e^-t +...
April 28, 2014

MATH 12
4 s h + s^2 = 12 so h = (12-s^2)/4s v = s^2 h v = s^2 (12-s^2)/4s = (12 s^2 -s^4)/4s v = 3 s -(1/4) s^3 dv/ds = 0 for max = 3 - (3/4) s^2 (3/4) s^2 = 3 s^2 = 4 s = 2 h = (12 - 4)/8 = 1
April 28, 2014

physics
V = 60 volts d = .03 meters E = 60/.03 = 2000
April 28, 2014

physics
no I do not know what question 4 is but divide the voltage by .03 meters to get E in a capacitor E = volts/ distance
April 28, 2014

physics
d = .03 meters E = V/d
April 28, 2014

physics
voltage is potential energy per unit charge. because The force on a charged particle in an electric field is q E between the plates of your capacitor E= V/d so the work done on the charge = Force * distance = q E d = = q V so 5*10^-4*60 = 300 *10^-4 = 3*10^-2 or .03J
April 28, 2014

physics
.1 Joules = 2*10^-6 V V = .1 * 10^6 /2 = .05*10^6 = 5*10^4 = 50,000 volts Yes :) and yes, volts is Joules per coulomb
April 28, 2014

physics
same thing again and again Volts is potential energy PER UNIT charge That is why they call Volts electric potential change in potential energy = charge * volts !!!
April 28, 2014

physics
Hey, this is the first problem I did for you backwards.
April 28, 2014

physics
Yes !!! :)
April 28, 2014

physics
Amanda, all your questions are answered by Voltage = potential energy per unit charge
April 28, 2014

physics
E q = Force (Newtons) { like m g ) so E q d = work (Joules) = increase in potential energy (like m g h) so E d = increase in potential energy per unit charge which we call V, voltage or electric potential (per Coulomb implied). like g h (increase in potential energy per unit ...
April 28, 2014

physics
Yes, m g h is joules in gravitational acceleration g E q = Force (Newtons) so E q d = work (Joules) = increase in potential energy so E d = increase in potential energy per unit charge which we call V, voltage or electric potential (per Coulomb implied).
April 28, 2014

physics
That is 30 Joules
April 28, 2014

TYPO 60 not 90
Yes, 60 volts * .5 coulombs = change in potential energy
April 28, 2014

physics
Yes, 90 volts * .5 coulombs = change in potential energy
April 28, 2014

physics
I am going to scream! Voltage = change in potential per unit charge. change in potential energy = q * change in V
April 28, 2014

Help- Math
You are welcome.
April 28, 2014

Help- Math
F = k/d^2 b) undefined because zero denominator (gets very big as d gets small) c) If an object has mass, it also has size. It is impossible to get d = 0 because the objects bump before their centers of gravity collide. So, although the force can become large, it does not ...
April 28, 2014

Math-Help
max profit is at 250 so if spending more than that, spend less
April 28, 2014

Math-Help
5000 = 1+ 50 a -.1 a^2 .1 a^2 - 50 a - 1 = -5000 .1 a^2 - 50 a + 4999 = 0 solve quadratic roots are 250+/-3sqrt1390 250 +/- 112 so 362 or 138
April 28, 2014

Math-Help
a) where is the vertex? .1 a^2 - 50 a -1 = -p a^2 -500 a -10 = -10 p a^2 - 500 a = -10 p + 10 a^2 - 500 a + 250^2 = -10 p + 62510 (a-250)^2 = -10 (p-6251 so max profit of 6251 at a = 250
April 28, 2014

Math-Help
No one, like no one, uses feet any more for physics problems but anyway It is a parabola (uppside down, sheds water) c) at t = 0, h = 5,1 d) find the vertex by completing the square or know that the rock is at the top when the velocity is zero which is when -32 t + 100.4 = 0 t...
April 28, 2014

Science
I is Iodine Cl is Chlorine
April 28, 2014

math
(1 dollar/16 oz)(40 oz/can)(18 cans) = $45
April 28, 2014

Science
NH4 +1 and Cl -1 and Na1+1 and OH1-1 are all ions
April 28, 2014

physics
.45 WHAT? millimeters, meters? pounds ? m/s^2 ? Newtons? Moreover, what is the question? Did you make it up or copy it incorrectly from somewhere?
April 28, 2014

physics
vetical speed = sqrt (2 g h) = sqrt (232) =15.2 m/s speed = sqrt (15.2^2 + 5.3^2)
April 28, 2014

Math
7! = 5040 if the two oldest are one, then we only really have six 6! = 720 but one could be right and the other left or reverse so twice that many *2 = 1440
April 28, 2014

biology
First, the vegetation takes in CO2 and uses it through photosynthesis to make vegetation and release O2. It also prevents runoff of the soil in gigantic floods by absorbing rainfall, protects all sorts of wildlife and flora that does not exist elsewhere, and grows many useful ...
April 28, 2014

biology
Oh my heavens, best Google that
April 28, 2014

biology
One might send the residents free firewood or solar panels and stop drinking coffee and stop the out of control growth of the human population.
April 28, 2014

math
(3b+2) / (9b+6) = 1(3b+2)/3*(3b+2) = 1/3 so the length is one third of the width :)
April 28, 2014

biology
More CO2 and less O2 in atmosphere (greenhouse effect) Loss of biodiversity (species go extinct even before we even knew their blood cured cancer or whatever.)
April 28, 2014

Algebra 2
twelve draw tree branches or do 3*2*2
April 28, 2014

algebra2
She gets four raises 30,000 (1 +1.02 +1.02^2 +1.02^3+1.02^4) You could just calculate that out or do it as a geometric sequence.
April 28, 2014

Physics
r = .039875*10^6 +1.74*10^6 = 1.78*10^6 G = 6.67*10^-11 M = 7.35*10^22 F = m v^2/r G M m /r^2 = m v^2/r v^2 = G M /r T^2 = (2pi)^2 * r^2/v^2 T^2 = (2pi)^2 * r^3 /GM T^2 = 39.5*5.64*10^18/(6.67*10^-11*7.35*10^22) T^2 = 4.54 * 10^7 = 45.4 * 10^6 T = 6.74 * 10^3 = 6740 seconds (...
April 28, 2014

Physics
Take a good look at the one I just did for help please. The numbers are different but the problem uses the same logic, primarily: T^2 = (2pi)^2 * r^3 /GM ------------------------------------ r = .039875*10^6 +1.74*10^6 = 1.78*10^6 G = 6.67*10^-11 M = 7.35*10^22 F = m v^2/r G M...
April 28, 2014

Physics MCQ - Quick check
You are welcome :)
April 28, 2014

Physics MCQ - Quick check
tan theta = sqrt 3/1 theta = 60 deg = pi/3 right
April 28, 2014

Physics MCQ - Quick check
A cube of mass 2.0 kg is kept pressed against a vertical wall by applying a horizontal force of 60N. If the coefficient of friction between the cube and the wall is 0.50, the frictional force between the cube and the wall is ? 19.6 N ---------------------------- If the cube is...
April 28, 2014

Physics MCQ - Quick check
Ac = v^2/R = c = 2 pi R Hey, you need to go faster, not slower ! T = c/v = 2 pi R/v so v^2 = (2 pi R)^2/T^2 v^2/R = {(2pi)^2/R T^2] 3 v^2/R = {(2pi)^2/R T^2] *3 so 3/T^2 = 1/T'^2 3 T'^2 = T^2 T'^2 = T^2/3 T' = T /sqrt 3
April 28, 2014

Engineering Physics
This is comparable to the position derivatives where: velocity = dx/dt and acceleration = d^2x/dt^2
April 28, 2014

Engineering Physics
omega = angular VELOCITY = d Theta/ dt alpha = angular ACCELERATION = d^2Theta/dt^2 Therefore b)
April 28, 2014

physics
I answered this before but the question disappeared Heat out of steam= 20 {2260+4.2(100-T)} Heat into water = 80 (T-20) so 4(T-20) = 2260 + 4.2(100-T) 4 T - 80 = 2260 + 4200 - 4.2 T 8.2 T = 6540 T = 797 which is silly of course What it means is that 80 grams of water at 20 ...
April 27, 2014

math
first pie cost 6 * 20 = 120 cents second pie cost 8 * 30 = 240 cents it doubled which is an increase of 100 % [ (240 -120)/120 ] * 100 = 100%
April 27, 2014

Algebra 1
This is Algebra 1 where ?
April 27, 2014

Algebra 1
1 agree https://hrdag.org/convenience-samples-what-they-are/ 2 agree http://en.wikipedia.org/wiki/Sampling_%28statistics%29#Systematic_sampling
April 27, 2014

Maths
You need five if you have no typos. Draw it on a piece of paper. to use math: tile area = 1/6*1/6 = 1/36 rectangle area = 1/6 * 5/6 = 5/36 5/36 / 1/36 = 5
April 27, 2014

Maths
Unless you have a typo (which I suspect), five of them in a row would cover it.
April 27, 2014

Math
I am taking the easy way out: http://www.cs.virginia.edu/~lat7h/blog/posts/219.html
April 27, 2014

Algebra 1
If that is Algebra 1, you are at a good school :)
April 27, 2014

Algebra 1
1 Yes (I had to think for a minute:) 2 Yes 3 Yes
April 27, 2014

algebra
2+3 = 5 so 2/5 and 3/5 2/5 = 10/25 3/5 = 15/25 check: 10 + 15 = 25 yes 10/15 = 2/3 check :)
April 27, 2014

Disappearing questions now ?????
There was another question in here that seems to have disappeared but my answer remained ?
April 27, 2014

physics
Heat out of steam= 20 {2260+4.2(100-T)} Heat into water = 80 (T-20) so 4(T-20) = 2260 + 4.2(100-T) 4 T - 80 = 2260 + 4200 - 4.2 T 8.2 T = 6540 T = 797 which is silly of course What it means is that 80 grams of water at 20 degrees simply can not condense 20 grams of steam. The ...
April 27, 2014

physics
Yes, it is just the ratio of heat of vaporization to heat of fusion. I get 2260 J/gram / 334 J/gram = 6.77 g
April 27, 2014

Linear algebra
note first that if a = 1, the first and third rows are identical (infinite number of solutions) then calculate the determinant of the coefficient matrix. Find its zeros. One will be a = 0 Look at second equation when a = 0, x+y = 0 and first equation gives x+y = 0 and third ...
April 27, 2014

math
9 x^2 - 2 x - 4 = 0 x= [ 2 +/- sqrt (4 + 144 ) ] / 18 x = [ 2 +/- 12.2 ] /18 it says approximate so I will say 12.2 = 12 x = 14/18 or -10/18 or x = .8 or -.6
April 27, 2014

physics
Hey look, Bob Pursley told you how to do these heat gained/ heat lost problems. You keep posting basically the same problem over and over. You are supposed to learn how to do them. Try. Post your attempts.
April 27, 2014

Physics
south momentum = 1900 * 13.6 = 25840 east momentum = 3854 * 9.8 = 37769 same after of course mass = 1900+3854 = 5754 south momentum = 5754 Vs = 25840 Vs = 4.49 m/s east momentum = 5754 Ve = 37769 Ve = 6.56 m/s V = sqrt (Vs^2+Ve^2) = 7.95 m/s tan angle E of S = Ve/Vs = 6.56/4....
April 26, 2014

Precalculus
To be in A intersect B, a number must be both prime and a factor of 36 factors of 36 less than 16: 1 3 4 6 9 12 of those only 1 and 3 are prime unite those with the multiples of 4 which are 4 8 12 and you get 1 3 4 8 12
April 26, 2014

Pages: <<Prev | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | Next>>

Search
Members