Friday
January 20, 2017

Posts by Damon

Total # Posts: 28,803

Social Studies
I tend to agree with you. He was no fan of slavery but wanted to stick within the law which defined the slaves as property at the time.
November 28, 2016

ah, Betta :)
2.5*4 = 8+2 = 10
November 28, 2016

math
rate is 40 person hours/ room (40 p hr/ r)/(4p) = 10 hr/room
November 28, 2016

trig
whew, good !
November 28, 2016

trig
you could say that r = -6 and theta = pi/2 but that is no good, r must be +
November 28, 2016

trig
x = 0 y = -6 that is 6 units directly below the origin so r = 6 = sqrt(0^2+6^2) you are three quarters of the way around to two pi
November 28, 2016

trig
Hey, sketch this stuff on a rough graph.
November 28, 2016

trig
r = 6 straight down = (3/4)(2 pi) = 3 pi/2 = 1.5 pi
November 28, 2016

science
No, I am not going to Google Young's modulus of steel for you, E L = 0.6 m r = 0.0025 m A = pi (.0025)^2 delta L/L = 2.5(9.81)/(E A) delta L = 0.6*2.5*9.81/(E*pi*.0025^2)
November 28, 2016

maths
(48 p/200g)500g = (5/2)*48 = 5*24 = 120p
November 28, 2016

algebra
x + x+15 = 43 2 x = 28 x = 14 x+15 = 29
November 28, 2016

Physics
assume constant torque = constant angular acceleration alpha omega = alpha * t theta = omega initial*t +(1/2)alpha t^2 129 * 2pi/360 = 2.25 radians so 2.25 = 0 + .5 alpha (36) alpha = .125 rad/s^2 omega = alpha t = .125*6 = .75 rad/s
November 28, 2016

trig
You are welcome.
November 28, 2016

4 pi/3
4 pi/3 = pi + pi/3 in quadrant three see your original question
November 28, 2016

Asfand - your pi/3 problem
is 4 pi/3 in third quadrant
November 28, 2016

maths
54/.75
November 28, 2016

maths
Huh? 6*5.8
November 28, 2016

Physics
v = omega r dv = omega dr omega = 2 pi radians/(24*3600)seconds dr = 18.2 dv = 2 pi (18.2) /(24*3600)
November 28, 2016

maths
No problem :) You are welcome.
November 28, 2016

maths
r^2 = 25 +25*3 = 100 so r = 10 tan theta = sqrt3 in quadrant III 60 degrees below x axis pi + pi/3 = 4 pi/3 you are in third quadrant because x and y are negative
November 28, 2016

Math
out = in / 10
November 28, 2016

History
no NO NO ! no Hey, google all four topics!
November 28, 2016

Check Answers SOCIAL STUDIES PLEASE
yes yes but perhaps more commonly D yes
November 28, 2016

Math
what if y = x^3 ----> y =x^1/3 is function y = x ---> y = x is function 2 y = x^3 + x ---> y+y^3 = 2x y(1+y^2) =2 x for x = 0 y = 0 or y = +/-i more than one value off y for x = 0, no, no for function
November 28, 2016

SCIENCE
I suppose 4, but I would call it habitat re-creation to combat habitat fragmentation.
November 28, 2016

Social Studies
C is certainly true historically but I do not know what period you are talking about. (Russo-Japanese war, World War 2 ??)
November 28, 2016

What excerpt ?
I do not see your excerpt. I would be inclined to agree with all of the above but have not seen what you read.
November 28, 2016

SCIENCE
LOL, that was easy ;)
November 28, 2016

Social Studies
Gee, Google it. I would go back to the original thin Spanish settlement claim to Texas, New Mexico, Arizona, California and parts of other states and the fact that they did not send a lot of settlers thereby letting people from the US settle. Be sure to cover the fact that ...
November 28, 2016

Algebra 2
They mean a,b,c,d by the way + and complex pair -5 +/- 2 i sqrt 5
November 28, 2016

Algebra 2
http://www.wolframalpha.com/widgets/view.jsp?id=3f4366aeb9c157cf9a30c90693eafc55
November 28, 2016

Math
6.8 min / 1 mile 30 min * 1 mile/6.8 min = 4.41 miles
November 28, 2016

math
1. yes 2. yes, works for any old y 3. just like 2 4. yes
November 28, 2016

PHYS-041-Keiler: Physical Science
assuming 5730 year half life a = Ai e^-kt a/Ai = .5 = e^-k(5730) ln .5 = -k(5730) k = 1.21 *10^-4 so a = 22 e^-(1.21*10^-4*11400) = 22 * e^-1.38 = 22* .252 = 5.54 kg
November 27, 2016

physics
T = 2 pi sqrt(L/g)= (2 pi/sqrt g)L^.5 = 1 second at 22 deg so you can get initial L dT/dL = (2 pi/sqrt g).5 /sqrt L dT/dt = dT/dL * dL/dt so what is dL/dt dL/L = 24*10^-6 dT dL /dT = 24*10^-6 L dL/dt = dL/dT *dT/dt = 24*10^-6 (-.625) L so dT/dt = [(2 pi/sqrt g).5 /sqrt L][24*...
November 27, 2016

Physics
assume I = (1/2) m r^2 for disk = (1/2)(6.5)(r)^2 Torque = I alpha where alpha = ang acceleration = a/r T = tension in rope so torque = T * r = I (a/r) T = I a/r^2 = (.5 m )a=.5(6.5)a now the block force down = m g force up = T ma = mg - T T = mg-ma = 2.5(g-a) so putting them ...
November 27, 2016

Stoichiometry
4.5 grams, look below at earlier question
November 27, 2016

Math
12 marbles to start drew one yellow 4/12 then 11 marbles of which 3 are yellow 3/11 so 4/12 * 3/11 = 1/11
November 27, 2016

maths
cost = 1040 - 240 = 800 (240/800)100 = 30% profit 12 * 6.50
November 27, 2016

Stoichiometry
(75/1000).6 = .045 mol CaCO3 = 100 g/mol so 4.5 grams
November 27, 2016

Stoichiometry
CaCl2 + Na2CO3 ---> CaCO3 +2NaCl one to one in mols of each 75 *.6 = x * .4
November 27, 2016

maths
2400 * .15 2400 * 1.15 .8*2400 before VAT
November 27, 2016

maths
0.8 Liters * n = 36 Liters n = 38/0.8 = 45 cans ======================= b makes no sense to me. It is a typo I think.
November 27, 2016

Math
t/5 = (t-5)10 t = (t-5)50 t = 50 t -250 49 t =250 t = 250/49
November 27, 2016

Probablility
I assume you never use the same machine twice first cardio = 4/10 = 2/5 second = 3/9 =1/3 third = 2/8 = 1/4 fourth = 1/7 product = 2/5 *1/3*1/4*1/7 = 1/210 now weight first =6/10 = 3/5 second = 5/9 third = 4/8 = 1/2 fourth = 3/7 product = 3/5 * 5/9 * 1/2 * 3/7 =1/14 so 1/210...
November 27, 2016

Algebra
7-5.375 = 1.625 for left and right margins 1.625 - .3125 = 1.3125 for right margin do the vertical problem the same way
November 27, 2016

Algebra
75*20 + 95*30 = x * 50
November 27, 2016

Math
5 * 3/1 = 15
November 26, 2016

pre calculus
100(-.5 -.866i) - 50 - 50 sqrt3 i
November 26, 2016

pre calculus
we want r(cos T + i sin T) r = sqrt ((-2)^2 +2^2) =sqrt 8 =2 sqrt2 -2 = r cos T = 2 sqrt 2 cos T cos T =-sqrt 2 / 2 T = 3 pi/4 2 = R sin T = 2 sqrt 2 sin T sin T = sqrt2 /2 T = 3 pi/4 all right so z =2 sqrt 2[cos .75 pi+isin .75 pi]
November 26, 2016

AP Calculus
well lets think it might be like a hot stone cooling down to some room temperature Tf Google Newton's law of cooling T = Ts +(To-Ts)e^-(k t) To is your original 1900 time Ts is your final time in 2100 or whatever which is the fastest one can ever go k is a constant that ...
November 26, 2016

physics
Your second method is the right way to go.
November 26, 2016

pre calculus
I think you probably mean: e^(a+bi) =e^a e^bi = e^a (cosb+isinb) then e^i? = e^(0+i?) =(e^0)(cos pi+isinpi) = 1(-1 + 0) or e^i? = -1
November 26, 2016

7th grade Pre- Algebra
R/5 - 6 = -1 add 6 to both sides R/5 +0 = 6 - 1 R/5 = 5 now multiply both sides by 5 (R/5)5 = (5)(5) R = 25
November 26, 2016

missing question
[f(x)-f(a)] /(x-a) = 7 as x-->a is the definition of the derivative f'(a) = 7
November 26, 2016

math
df/dx = 4 x^2/[x^3 +3] at x = -1 df/dx = 4/[2] = 2 so f(-1+dx) = f(-1) + 2 dx here dx = -.1 so f(-1-.1) = -3 +2(-.1) = -3 -.2 =-3.2
November 26, 2016

Physics
t is in seconds 40 t = 42(t-120)
November 26, 2016

math
sin ? = 0 slope = cos ? = -1 f(x) = sin(?) -1(x-?) = -(x-?)
November 26, 2016

science
global positioning systemhttp://www.safewise.com/blog/10-wearable-safety-gps-devices-kids/ ( of course I use GPS to get around the bleak ocean but that is old stuff:) sampling whale snot with drone http://shop.whale.org/pages/snotbot tidal power generation systems http://...
November 26, 2016

Electronics
http://www.electronics-tutorials.ws/rc/rc_1.html
November 25, 2016

Math
s^3 = 512 s = 512^(1/3) calculate s = 8 A = 6 (s^2) = 6 * 64
November 25, 2016

Calculus application of sin function
v = dh/dt = sin pi t then h = - (1/pi)cos pi t but h = A cos (2 pi t/T) so A = -1/pi pi = 2 pi /T so T = 2 so in the ean h =-(1/pi) cos pit = -(1/pi)cos(2 pi t/2) B) h =-(1/pi) cos pit v = dh/dt = sin pi t a = dv/dt = pi cos pi t C)1/pi D) cos 0 = 1 so at t = 0 , 1 , 2 etc E) ...
November 25, 2016

second graph link not rights
http://www.wolframalpha.com/widget/widgetPopup.jsp?p=v&id=8d8e2c27bcaa121d6ee0de4b98774bb4&title=Polar%20Graphs&theme=blue&i0=r%3D2(2-sin^2%C9%B5)^%C2%BD%20&i1=0&i2=Pi%2F2&podSelect=&showAssumptions=1&showWarnings=1
November 25, 2016

calculus
I suspect you mean: r=2(2-sin2?)^½ that makes me nervous that since you do not type exponents you might mean 2-sin^2 ? instead of what your typed. I will assume that first graph it here with sin 2? http://www.wolframalpha.com/widget/widgetPopup.jsp?p=v&id=...
November 25, 2016

Science
mass = 150/g or about 15 kg but who needs it? x = A sin w t v = Aw cos wt a = -Aw^2 sin wt = -w^2 x ============================= when x = .2 = A sin w t v = 5 = Aw cos w t a = +20=+Aw^2 sin w t = +w^2x =============================== so w^2 x = w^2(.2) = 20 w^2 = 200/2 = 100 ...
November 24, 2016

Maths
x^2 y = V G = 4x+y = 6 ================== y = 6-4x x^2 (6-4x) = V now do the complete the square thing like I did in your other problem to find the vertex of the parabola
November 24, 2016

Engineering
4 x = 800 x = 200 feet on a side square ========================= prove that square is max area A = x y P = 2 x + 2 y perimeter so x + y = P/2 A = x (P/2 - x) = -x^2 +P/2 x x^2 - (P/2) x = A find vertex,complete square x^2 - (P/2)x + P^2/16 = -A + P^2/16 (x-P/4)^2 = -(A-P^2/16...
November 24, 2016

math
s = standards d = deluxe 12 s +18 d = 360 ____divide by 6 s + d = 25 ________multiply by 2 2 s + 3 d = 60 2 s + 2 d = 50 -------------- d = 10 then s = 15
November 24, 2016

Physics
assume you mean 5 m/s^2 50 *1000/3600 = 13.9 m/s v = 13.9 - 5 t 0 = 13.9 - 5 t t = 13.9/5 average speed during stop = 13.9/2 d = (13.9/2) (13.9/5) or d = Vi t - .5 (5) t^2 d =13.9(13.9/5)-.5 (5) (13.9^2)/5^2 = .5 *13.9^2/5 the same
November 24, 2016

physics
ub^2 = .25 ua^2 average speed for initial slowing = .5(ua+ub) assume constant a t = .05/.5(ua+ub) = .1/(ua+ub) v = Vi +at ub = ua + a t ub-ua = a (.1)/(ua+ub) .1 a = -(ua^2-ub^2) .1 a = - (.75 ua^2) a = -7.5ua^2 now complete trip 0 = ua + a t t = ua/7.5ua^2 = 1/(7.5ua) d = Vi...
November 24, 2016

Math
There are lots of different ways. perhaps the easiest to understand uses the distributive property 12 = 10 + 2 13 = 10 + 3 (10 + 2) (10 + 3) = 10 (10+3) + 2 (10+3) = 100 + 30 + 20 + 6 = 100 + 50 + 6 = 156 ========================== You can shorten that by saying 10(13) + 2(13...
November 24, 2016

Physics
If there is no moment (torque) then there is no change of angular momentum [ I omega = constant] If they are not opposite in direction through the same point, they cause a moment, called a "couple"
November 24, 2016

algebra
n and 2 n 2 n - n = 20 n = 20 and so answer = 2n = 40
November 23, 2016

Gaussian Elimination Method
LOL, forgot the old easy stuff :)
November 23, 2016

Gaussian Elimination Method
to check, put it back in -4(-1) -(-2) = ? yes 6 12(-1) -2(-2) = ? yes -8
November 23, 2016

physics
m v^2/r horizontal m g down tan theta = mg/(mv^2/R)where theta is angle down from horizontal but cos theta = .7/2.8 so theta = 75.5 deg so tan theta = 3.87 so 3.87 = mg/mv^2/R = 9.81/(v^2/.7) v = 1.33 m/s m v^2/R = .4*1.77/.7 = 1.01 m g = .4*9.81 = 3.92 T^2 = 1.01^2 +3.92^2 T...
November 23, 2016

Math
9*10^-3 LY (5.88*10^12 mi/LY) = 52.92 * 10^9 mi = 5.292 * 10^10 mi
November 23, 2016

math!
q = first questions/min 2 q = final que/min t min for first ten 48 - t min for final 11 q t = 10 so t = 10/q q t + 2q(48-t) = 21 10 + 96q - 20 = 21 96 q = 31 q = 31/96 questions/min so twice that = 62/96 to finish ======================== check t = 960/31 = 30.97 min 48-t = 17...
November 23, 2016

Algebra 2
.75 x + .42 y = .5784 (100) x+y = 100 ============================ .75 x + .42 y = 57.84 .75 x + .75 y = 75 ---------------------- -.33 y = - 17.16 y = 52 x = 48 E
November 23, 2016

Physics
h f = 14.7 eV lambda = c T = c/f c about 3*10^8 m/s
November 23, 2016

Physiscs
well the length is L sqrt 13 but who cares? force up from floor = m g = 3g (because wall is smooth none up there) force sideways from wall = F thus force sideways at floor = F toward wall Now moments about center clockwise mg * 2L/2 = m g L counter clockwise F*1.5 L + F*1.5 L...
November 23, 2016

physics
80 km/hr * 1 hr/3600s * 1000 m/km = 22.2 m/s tan T = v^2/r / g = v^2/gr tan T = 22.2^2/(981) tan T = .502 T = 26 deg 39 min
November 23, 2016

Physics
rho g h 1000 * 9.81 * 20 = 196,200 Pascals = 1.94 atm gage (over 1 atm) or 2.94 atm absolute
November 23, 2016

Physics
done already
November 23, 2016

Calculus
Oh, but I said where x = +/- infinity
November 23, 2016

Calculus
Oh, yes :)O
November 23, 2016

Calculus
Oh my, look around x = 0 and x = 1 and x = infinity and x = -infinity http://www.wolframalpha.com/input/?i=plot+1%2F(x(x-1))
November 23, 2016

Math
a) sin is + in I and II b) cos is - in II so there only c) hard to sketch here from origin up 7 distance 25 x^2 + 7^2 =625 and x is - x^2 = 625 - 49 = 576 x = -24 so point is at (-24,7) cos C = -24/25 tan C = -7/24
November 23, 2016

Math
cos /sin = -1 = cotan 90 + 45 360 - 45
November 23, 2016

Consider the linear programming problem
You are welcome.
November 23, 2016

Consider the linear programming problem
which we could have seen without doing the problem :) The potato seed costs less and the profit is more
November 23, 2016

Consider the linear programming problem
maximize 150 x + 50 y x + y <=70 20 x + 60 y <= 3000 x>= 0 y>= 0 x+y >=1 to fill in input form only http://www.wolframalpha.com/widget/widgetPopup.jsp?p=v&id=1e692c6f72587b2cbd3e7be018fd8960&title=Linear%20Programming%20Calculator&theme=blue result 10500 at (70,0)
November 23, 2016

Calculus
f' = 10 - 10/x^2 f" = 0 - 10 [ -2/x^3] = 20/x^3 I do not see anyplace where the curvature passes through zero except at x = +/- infinity
November 23, 2016

Linear Programming to Maximize Profit
You are welcome.
November 23, 2016

Linear Programming to Maximize Profit
Oh my heavens I have done so many linear programming problems tonight! s uses 6 plastic d uses 3 plastic so 6 s + 3 d </= 300 s uses 4 metal d uses 8 metal so 4 s + 8 d </= 608 s </=22 maximize 10 s + 2 d I get 332 at (22,56) using http://www.wolframalpha.com/widget/...
November 23, 2016

math
7x = 1.40 x = .20 2x = 0.40 4x = 0.80 5x = 1.00 7x = 1.40 sum = $3.60
November 23, 2016

simplex method
For instructions using Simplex with pivots etc see http://en.wikipedia.org/wiki/Simplex_algorithm
November 23, 2016

doing with linear programming
http://www.wolframalpha.com/widget/widgetPopup.jsp?p=v&id=1e692c6f72587b2cbd3e7be018fd8960&title=Linear%20Programming%20Calculator&theme=blue max = 3220 at (12,50)
November 23, 2016

Calculus
This is a closed path check first if field is potential in which case integral is zero F = z^2 i + 2xy j + 3y^2k del cross F = 0 ???? nope no way so first line = 3 i + 0 j + 0 k F dot line = Fx *3 = 0*3 = 0 second line in x from 3 to 3 = 0 in y from 0 to 3 = 3 in z from 0 to 1...
November 23, 2016

Calc
or rather curl F
November 23, 2016

  1. Pages:
  2. <<Prev
  3. 1
  4. 2
  5. 3
  6. 4
  7. 5
  8. 6
  9. 7
  10. 8
  11. 9
  12. 10
  13. 11
  14. 12
  15. 13
  16. 14
  17. 15
  18. Next>>