Sunday
July 5, 2015

Posts by Damon


Total # Posts: 21,427

Physics
The tension and mass density determine the speed of the wave along the string. The input frequency is the wave frequency wavelength = speed * period = speed/frequency so frequency, tension and mass density right
June 4, 2015

Physics
A yes B yes C No D yes I agree.
June 4, 2015

Algebra
L^2 + w^2 = d^2 (d-3)^2 + (d-8)^2 = d^2 d^2 - 6 d + 9 + d^2 -16 d + 64 = d^2 d^2 - 22 d + 73 = 0 d = [ 22 +/- sqrt(484 - 292) ] / 2 d = [ 22 +/- 13.9 ] / 2 d = 17.9 or 8.1 8.1 is impossible if the area is 84 so d = 17.9 ------------------- check then w = about 10 and L = about...
June 4, 2015

Math
66 = 2*33 = 2 * 3 * 11 99 = 3 * 33 = 3 * 3 * 11 20 = 2*10 = 2 * 2 * 5 etc, boring
June 4, 2015

Math
look at b^2 - 4 a c if +, then two intercepts if 0, then just grazes the x axis, one intercept if -, then never hits the axis, imaginary roots only if a x^2 + b x + c = 0 then - (a x^2 + b x + c) = 0 is the same because +0 = -0
June 4, 2015

math
sin^4⁡x-cos^4⁡x = (sin^2 x+cos^2 x)(sin^2 x -cos^2 x = 1 (sin^2 x - cos^2 x) = 2 sin^2 x - 1
June 4, 2015

physics
d1 = (1/2)(5)(64) Vi = 0 + 5 * 8 d2 = Vi * (12-8) d = d1 + d2
June 4, 2015

math
one leg of right triangle is 150 other leg is 120 sqrt (150^2+120^2) = 192
June 3, 2015

Social Studies
You are welcome.
June 3, 2015

Social Studies
Write your thoughts and perhaps a teacher will help. hints - where is the Statue of Liberty ? What words are on it? How many buffalo are around, not to mention native tribes ? Wicked difficult growing cotton and rice and stuff under the snow.
June 3, 2015

Math
slope = (13-10)/(5-4) for example = 3 so T = = 3 S + b 1 = 3 + b b = -2 so T = 3 S - 2
June 3, 2015

Math
sorry - I used 15 mph instead of 18
June 3, 2015

Math
at 12 it tskes t so d = 12 t at 15 it will take .25 leas time d = 15 (t-.25) so 12 t = 15 t - 15/4 3 t = 15/4 t = 5/4 d = 12(5/4) = 15 miles
June 3, 2015

Math
120 = x t so t = 120/x 120 = (x+5)(t-1/3) or 120 = (x+5)(120/x - 1/3) 120 (3)(x) = (x+5)(360 - x) 360 x = 360 x -x^2 + 1800 -5 x x^2 + 5 x - 1800 = 0 (x-40)(x+45) = 0 x = 40
June 3, 2015

Math
t is time after 12 noon f for freight train distance f = df = 50 t p for passenger train dp = 60 (t-1) when is dp - df = 300 ? 60(t-1) - 50 t = 380 10 t - 60 = 380 10 t = 440 t = 44 hours so one day and 20 hours so 8 am --------------------------------- total distance = 2d ...
June 3, 2015

physics
120/360 = 1/3 of circumference so distance pushed = d = (1/3) 2 pi (.9) work = force * d = 11 *d Joules power = work/time = 11 * d / 2.2 in Watts
June 3, 2015

PHYSICS
v = a t where a = alpha = angular acceleration = torque/I here I is moment of inertia of uniform disc = (1/2) m r^2 so I = (1/2)(6)(.04) = .12 and a = 30/.12 = 250 radians/s^2 then v = 250 t and theta = (1/2)a t^2 = 4 pi radians so 125 t^2 = 4 pi t = .317 second then v = 250(....
June 3, 2015

math
3 x^2 - 12 x - 7 = 0 x = [ 12 +/- sqrt(144+84) ] / 6 = [ 12 +/- sqrt(228) ] / 6 = [ 12 +/- 2 sqrt(57) / 6 = [ 6 +/- sqrt(57) ] / 3 Use PARENTHESES !!!~!!~!!!!! I can not tell whsat is your numerator.
June 3, 2015

civics
Looks pretty federal to me.
June 3, 2015

civics
yes
June 3, 2015

civics
Well which do you think based on the answer to your other question?
June 3, 2015

math
0 = 1^2 - 1 3 = 2^2 - 1 8 = 3^2 - 1 15= 4^2 - 1 25= 5^2 - 1 Term = n^2 - 1
June 3, 2015

Physics
As far as I know a right hand rule is a right hand rule.
June 3, 2015

physics
first get acceleration of the two masses a = F/m = (2*9.81)/(7) then: mg - T = m a 2*9.81 - T = 2 a T = 2 (9.81 - a)
June 3, 2015

Math
because if they were similar then if V to W is 5 and R to S is 10 then if similar W to X must be HALF of S to T It is not, it is sqrt 5 times I know which sides to compare because I drew a quick sketch of the two figures.
June 2, 2015

Math
V to W = sqrt (25+0) = 5 R to S = sqrt (100+0) = 10 W to X =sqrt(49+9) = sqrt(58) S to T = sqrt(169+121) = sqrt (5*58) oh my :(, not twice, would be sqrt 4*58 if similar
June 2, 2015

Math
agree
June 2, 2015

physics
m g /area m = .050 KG g = 9.8 m/s^2 area = pi r^2 = pi (9 *10^-6) meters^2 so p = .0173 * 10^6 N/m^2 or Pascals = 1.73 * 10^4 Pascals or around .2 atmospheres
June 2, 2015

physics
That makes no sense to me at all. The total mechanical energy is the sum of the kinetic and potential energies.
June 2, 2015

Algebra
t = k/r 12 = k/60 so k = 12*60 then t = 12*60/85 = 8.47
June 2, 2015

Physics
well, the second equation is -A cos 41.9 + B cos 25.2 = 0 which is B = A(cos 41.9 / cos 25.2) so use that for B in the first equation
June 2, 2015

Physics
assume if A is in Quadrant 2 then B is in quadrant 1 (or the opposite, does not matter) sum of y components = 0 A sin 41.9 + B sin 25.2 - 25.8 = 0 sum of x components = 0 -A cos 41.9 + B cos 25.2 = 0
June 2, 2015

physics
d = .8 meter so F = G *55*70 /(.64) where G = 6.67*10^-11 m^3 /(kg s^2)
June 2, 2015

physics
force = 2*9.81 - 7 = 12.6 Newtons accelerated mass = 5 + 2 = 7 a = F/m = (12.6/7) m/s^2
June 2, 2015

Math
well, look at what happens to point (-1,0) it remains at (-1,0) when reflected around y=x+1 because it is on that line so just reflect it about y = x+3 drawing the graph I see it went left 2 from -1 and up the same amount, 2, from 0 so left 2 and up 2 :)
June 2, 2015

Math help please
40/80 = .5 20/80 = .25 60/80 = .75 so steepest 3/4 D
June 2, 2015

Math
believe me, it is much less confusing using another symbol for x^2 then replacing it at the end.
June 2, 2015

Math
let f(x) = z = x^2 so x = sqrt z and z always positive y = 3 (-4 sqrt z-2)^2 + 5 y = 3(16 z + 16 sqrt z +4) + 5 y = 48 z + 48 z^.5+ 17 y = 48 f(x) +48 f(x)^.5 + 17
June 2, 2015

Math
Steve and I both said the same thing in different ways. Here is another. like when is 2x+3 = 0 ??? when x = -3/2 so what is f(0) it is 0 so when x = -3/2 then g(x) = 0
June 2, 2015

Math
if x = -1, 2x+3 = 1 and -f(1) = -4 if x = 0, 2x+3 = 3 and -f(3) = -10 etc
June 2, 2015

Math
Huh? If that is a table of values of x and y, then y = 5 when x = 3
June 2, 2015

Physics
I guess you mean g = 10 m/s^2 Work done = increase in potential = m g * increase in height = 5 kg * 10 m/s^2 * 10 m = 500 Newton meters = 500 Joules
June 2, 2015

Math (check answers)
5 d^(6-12) = 5 d^-6 yes
June 1, 2015

civics
I think D is the correct answer. but knowing the speaker, it might be C :)
June 1, 2015

algebra--1 question
No, read above, a
May 31, 2015

algebra--1 question
check 14*75 = 1050 300 + 750 = 1050 sure enough
May 31, 2015

algebra--1 question
x^3+0x^2-7x+6/(x+3) = x^2-3x+2 which is a
May 31, 2015

Algebra II
agree but check as follows 1 + 5 (6-8) = 2 - (6+5) ???? 1 - 10 = 2 - 11 ??? -9 = - 9 Yes :)
May 31, 2015

math
3 x^2 - 12 x - 7 = 0 x = [12 +/- sqrt (144 + 84 ) } / 6 [ 12 +/- sqrt(228) ] /6 [ 12 +/- 2 sqrt(57) ]/6 2 +/- (1/3)sqrt(57)
May 31, 2015

nuclear chemistry
atomic number of Ir = # of protons = 77 so mass of protons = 77.56056 amu mass of neutrons = 110.9526 amu total mass = 188.51316 amu 188.51316 - 187.95883 = .55433 grams/mol = .00055433 kg/mol * c^2 for energy /mol .00055433 kg/mol * 9 * 10^16 = .00498897 *10^16 Joules/mol ...
May 31, 2015

Math
x = (8 - 3 y) then 3 (8 - 3 y) - 2 y = 2 24 - 9 y - 2 y = 2 11 y = 22 etc
May 30, 2015

Math
If you learned FOIL, use it otherwise use the distributive property 2 y(3y-2) -3 (3y-2) = 6 y^2 - 4 y - 9 y + 6 = 6 y^2 - 13 y + 6
May 29, 2015

Math
There are 16 kids and 16 beds total. We know that Tim is in green. So the question is what is the probability that Jorge will be in green. After Tim moves in, there are seven beds left in green out of fifteen beds total. so 7/15
May 28, 2015

Algebra
Associative http://www.mathwarehouse.com/dictionary/A-words/definition-of-associative-property.php
May 28, 2015

Algebra
graph the lines using = signs then look at corners It looks to me like x+y is max on y axis and is 4+3/2 = 5.5
May 28, 2015

science
Whoops, sorry. Watts. Thank you for catching that
May 28, 2015

science
work = force * distance in direction of force power = work per unit time so 900 * 40 /45 in Newton meters/second which is JOULES
May 28, 2015

Algebra
Use the distributive property of multiplication 3h (2h^2-7h+1) + 2 (2h^2-7h+1) then collect like terms
May 28, 2015

Calculus
[ 1 - (x/(1-x))] / [ 1 +(x/(1-x)) ] [ 1-x - x]/ [ 1-x +x] 1-2x if x = 1, g(x) is undefined
May 27, 2015

Math
stock amount = s bond amount = b gain = -.04 s + .032 b = -11.2 gain = -.032 s + .04 b = 3.2 =============================== https://oliveramesmacrof.wordpress.com/definition-of-financial-assets-money-stocks-bonds/
May 26, 2015

Social Studies
agree
May 26, 2015

Physics
mv^2/R = GmM/R^2 so M = v^2 R/G = 8.02^2 * 1037/ (6.674×10−11)
May 26, 2015

Nah !!! Typo I bet
The width is 3 times the length ? Strange table
May 26, 2015

Physics
It goes up a distance h in 2.9 seconds It goes horizontal a distance 12 meters in 2.9 seconds so u = 18 cos T = 12/2.9 cos T = .23 T = 76.7 degrees above horizontal so initial velocity up Vi = 18 sin 76.7 = 17.5 m/s h = Vi t -.5*9.81*t^2 h =17.5*2.9 - 4.9(2.9)^2 = 50.8-41.2 = ...
May 26, 2015

Math
x goes up, y goes down, d both x and y change that only happens in quads one and three I agree about 3
May 26, 2015

math algebra 1
L w = 82 d^2= (L^2+w^2) but L = d-2 and w = d-8 L^2 = d^2 -4 d + 4 w^2 = d^2 -16 d + 64 so L^2+w^2 = 2d^2-20d+68 = d^2 so d^2 - 20d + 68 = 0 d = [ 20 +/-sqrt(400-272)]2 d = 10 +/- 5.66 d must be bigger than 8 so d = 15.66 check my arithmetic
May 26, 2015

Math Help
she rolls one cube and gets some number. her chances of getting the same number again are 1/6 Her chances of getting a 5 on one spin are also 1/6 So six of one, half dozen of the other :)
May 26, 2015

MATH
(x-2)(x-2)
May 26, 2015

physics
Ke = (1/2) m v^2 = 500 joules m g h = 500 10 (9.81) h = 500
May 25, 2015

Physics
v^2/R = g v^2/45 = 9.81
May 25, 2015

maths
ACD = 90 - 35 = 55 so ABD = 55 (opposite same chord AD)
May 25, 2015

physics
call original speed v Original momentum = 2 v Final momentum = 2 v/4 + Mb Vb so 4 v = v + 2 Mb Vb or Mb Vb = 3 v original Ke = .5 (2) v^2 = v^2 final Ke = .5 (2)v^2/16 + .5 Mb Vb^2 so (15/16) v^2 = (1/2) Mb Vb^2 (15/8) v^2 = Mb Vb^2 = 3 v Vb (5/8)v = Vb but Mb Vb = 3 v so Vb...
May 25, 2015

Algebra
5/16 is greater than 4/16
May 25, 2015

Algebra
20.5/3.25 = 6.3 so only six with a little cloth left over
May 25, 2015

American Government
We have three branches in the US Executive (president etc) Legislative (congress) judicial (supreme and other courts) The press is sometimes referred to as the "fourth estate". However "the people" are part of governing so I would claim the the people is ...
May 25, 2015

maths
radius = 0.70 meters = r height = 1 meter = h vol = pi r^2 h area = 2 pi r^2 + 2 pi r h
May 25, 2015

Math 7
You are welcome.
May 25, 2015

Math 7
8*1.5 = 12 10*1.5 = 15 then 3*12 = 36 3*15 = 45
May 25, 2015

medical science
Sorry - I do physics.
May 25, 2015

science
yes, the mass per unit volume is greater than water for the penny and less than water for the ball.
May 25, 2015

Math
pi * 1.5 * 1.5 * 2 = 14.14 you did not square r in pi r^2
May 25, 2015

Algebra (VERY IMPORTANT)
If it is important, please identify what is numerator and what is denominator. eg 2/ [3(4x+2)^2] = 8 or 2/ { [3(4x+2)^2] +1 } = 9 or (2/3)(4x+2)^2 = 8 or whatever
May 25, 2015

Algebra
write them all properly in sci notation 3.21 * 10^1 4.2 * 10^5 1.1 * 10^9 Now it is pretty obvious that they are in order already
May 25, 2015

Algebra
yes
May 25, 2015

Algebra
Your turn
May 25, 2015

Algebra
4.74 * 10^-7 write the significant digits as a number from 1 to 9 and then just count left or right
May 25, 2015

Algebra
8.06 * 10^8
May 25, 2015

science
yes charge goes down mass goes down
May 25, 2015

Chemistry actually
14.0 what of KOH ? grams, milligrsms moles? How do you calculate what?
May 24, 2015

Physics
NO!!!! You assume that the acceleration, a, is CONSTANT. v = 0 + a t at t = 1.18 s v = 7.96 m/s so 7.96 = a (1.18) a = 7.96/1.18 NOW use x = 0 + 0 + (1/2) a t^2
May 24, 2015

Physics
x = 16 t also x = (1/2)(2) (t-5)^2 so 16 t = t^2 - 10 t + 25 t^2 - 26 t + 25 = 0 t = [ 26 +/- sqrt(676-100) ]/2 t = [ 26 +/- 24 ]/2 t = 2 or t = 25 t = 2 is negative x at start so use t = 25 which is 400 meters from start
May 23, 2015

Science
-2 e
May 23, 2015

Algebra
50*900 = 45000 50*20 = 1000 so 46,000 + 2 weeks = 48,000 a bit less because we used 920 instead of 919 so yes, pick 46,800
May 23, 2015

Algebra
You are welcome again.
May 23, 2015

Algebra
4 * 250 = 1000
May 23, 2015

algebra--1 question
[ (x+2)/{5(x-3)} ] (5)(2 x^2-5x-3) [ (x+2)/(x-3)] (2x+1)(x-3) (x+2)(2x+1)
May 23, 2015

Algebra
You are welcome.
May 23, 2015

Algebra
Yes
May 23, 2015

Science
I do not know. All you can say from this is that the volume of the object is the same as that of the water displaced. 30 N = 1000kg/m^3 * 9.81 m/s^2 * v v = 30/9810 cubic meters However we do not know how much force it exerted on the bottom of the container so we do not know ...
May 23, 2015

Physics
5 * 9.81 * 7 Joules
May 23, 2015

  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>>

Members