Tuesday
September 16, 2014

Posts by damon


Total # Posts: 18,489

Algebra
that last number = (d/2)^2 so 64 = d^2/4 d^2 = 4 * 64 d = 2*8 d = 16 like (x+8)(x+8) then the second one d^2/4 = 49/4 so d = 7 like (x+7/2)(x+7/2) = x^2 + 7 x + 49/4
September 15, 2014

geography
HUH? They are perpendicular to each other. Meridians run north South and equator runs East west. There is only one equator, around the middle between north and south poles. There are lots of meridians stretching from north pole to south pole and just one is selected (through ...
September 15, 2014

Physical Science
subtract
September 15, 2014

Chemistry
every .001 mol Ca(OH)2 needs .002 mol of HCl so we have .002 mol in 25*10^-3 liters .002/.025 = .08 mol/liter
September 15, 2014

Chemistry
N 14 g/mol H 1 g/mol NH3 is therefore 17 g/mol, 2NH3 is 34 N2 is 28 g/mol every 2 mol of NH3 requires 1 MOL OF N2 so every 34 g of NH3 requires 28 g of N2 so finally 325 g NH3 (28 N2/34 NH3) = 268 g N2
September 15, 2014

Chemisty
Mg --> 24.3 g/mol 2 O --> 32 2 H --> 2 sum = 58.3 g/mol 17.8 g * (1 mol/ 58.3 g) = .305 Mol ======================================== 123 + 273 = 396 deg K 468 + 273 = 741 deg K P1 V1/T1 = n R = P2 V2/T2 V2 = V1 (P1/P2) (T2/T1) V2 = 20.46 (1.35/1.35) (741/396)
September 15, 2014

Math
length of ramp is hypotenuse = c length along floor is adjacent = a cos (angle) = a/c
September 15, 2014

History
Whew :)
September 15, 2014

History
the mission included men with skills or training in ******geology******, botany, zoology, and ethnology as well as a naturalist, an artist, and a topographer.
September 15, 2014

Can't follow links, help please
From http://digital.library.okstate.edu/encyclopedia/entries/P/PI007.html Many of the objectives of this expedition were fulfilled. In 1806 Wilkinson ordered Pike and an ill prepared party of twenty-two to seek the headwaters of the Arkansas and Red Rivers, obtain the return ...
September 15, 2014

Physics
v = 5 - 9.8 t 0 = 5 - 9.8 t t = 5/9.8 = .51 seconds to top where v = 0 average speed going up = 5/2 = 2.5 m/s h = 1.5 + 2.5 * .51 = 2.78 meters (a) no way (b)The same speed it will have if dropped from the top of the wall and landing on a platform 1.5 m high 3.95 - 1.5 = 2.45 ...
September 15, 2014

Math
Yes.
September 15, 2014

Math
27/9 =
September 15, 2014

college algebra
.08 x + .04(29,000-x) = 1680
September 15, 2014

general knowledge
I bet you mean 15 sept in which case type: TODAY
September 15, 2014

8th grade math
5^2/5^5 = 1/5^3 = 5^-3 = 1/125
September 15, 2014

Physics
v^2/r
September 15, 2014

physics
k Q1Q2/r^2
September 15, 2014

Physics
(v+c)19.8 = (v-c)21 and (v+c)19.8 = 208
September 15, 2014

Algebra 2
5 n + 25 q = 620 25 n + 5 q = 970
September 15, 2014

Statics
102
September 15, 2014

World History (Ms. Sue)
Pretty good.
September 15, 2014

Math using quadratic equation
I suspect typos and there is no quadratic involved as it is stated. v = passenger train speed (v - 12) = freight train speed (v-12)t = 65 v t = 165 so 65/(v-12) = 165/v 65 v = 165 v - 1980 100 v = 1980 v = 19.8 mph v-12 = 7.8
September 15, 2014

Math using Quadratic equation
s^2 = 196 s = 14 check : 12 * 14 = 196
September 15, 2014

Curriclum
You are right !
September 14, 2014

math
-32 - 13
September 14, 2014

physics
average speed during deceleration = 2.5*10^3 m/s time is then 4 m/2.5*10^3 m/s = 1.6*10^-3 seconds to stop a = - 5*10^3/1.6*10^-3 = -3.125*10^6 m/s^2 = - 3,125,000 m/s^2:)
September 14, 2014

physics
u = 75 cos 57.3 so t = 21.5 /(75 cos 57.3) Vi = 75 sin 57.3 h = Vi t - 4.9 t^2 answer = h-11
September 14, 2014

Physics
I just answered this a few minutes ago. I used the rest mass here because .3*.3 is just about .1 and not worth calculating beta. However look at the problem below this one if you want to do the relativistic problem. Posted by Paul on Sunday, September 14, 2014 at 4:30pm. ...
September 14, 2014

Physics
m at .77 c beta = .77 sqrt (1 - beta^2 )= sqrt(.4071) = .638 so m' = 1/.638 = 1.57 kg (1/2)m' v^2 = 4.19*10^16 Joules
September 14, 2014

Physics
(1/2) m v^2 = 5,000 * (.3*3*10^8)^2 = 5*10^3 * .81 * 10^16 = 4.05 * 10^19
September 14, 2014

Pre-Calculus
http://www.mathportal.org/calculators/polynomials-solvers/polynomial-roots-calculator.php
September 14, 2014

math
L = (3w-5) L w = 782 (3w-5)w = 782 3 w^2 -5 w -782 = 0 (3w+46)(x-17) =0 x = 17 or x = -46/3 use x = 17 then L = 782/17 = 46
September 14, 2014

math
over in the triangle between shadows we have a 32 degree angle. At the other end of our 60 meters we have a 180=54 = 126 degree angle. Therfore up at the top of that triangle we have a 180 - 32 - 126 = 22 degree angle law of sines for long hypotenuse ray call it x sin 126/x = ...
September 14, 2014

alg 2
If x > -8 y < x+8 - 4 or y < x+4 If x <-8 y < -(x+8) - 4 or y <-12 -x
September 14, 2014

Physics
I answered this a few minutes ago (29.5+15.5)/(5*10^-3)
September 14, 2014

history pt 2
Romans wanted first of all control of Sicily. Carthaginians wanted the Romans to stop trying to take over their trade routes and territory.
September 14, 2014

Physics
3/x = 2/(x-5) 2 x = 3 (x-5) 2 x = 3x-15 x = 15
September 14, 2014

Pre-Calculus
Hey, I did this down below.
September 14, 2014

Pre-Calculus
5/4 +/- 2 i sqrt(11)
September 14, 2014

Pre-Calculus
*************_2x^2___________-1x+1 (3x^2 + 13) / 6x^4-3x^3+29x^2+0x+0 **************6x^4_____+26x^2_____ *******************-3x^3+3x^2 +0x+0 *******************-3x^3______-13x ************************ +3x^2+13x+0 ************************ +2x^2____+13...
September 14, 2014

history
Yes
September 14, 2014

Physics
change in velocity/change in time = (15.5 +29.5)/5*10^-3 if the second part asks for the average force, multiply by the mass
September 14, 2014

Physics
how far does it fall in .19 s ? delta h = (1/2) g t^2 = 4.9*.19^2 = .177 meter = 17.1 cm u = 14 d = u t = 14 *.19 = 2.66 m to board
September 14, 2014

Pre-Calculus
18 x^2 - 6 x +1 = 0 x = [6 +/- sqrt ( 36 - 72) ] /36 = [(1/6) +/- sqrt(-1) ] = 1/6 +/- 1 i
September 14, 2014

Physics
power = i V 400 = i (120) i = 3.33 rms i peak = i rms * sqrt 2 = 4.71 amps peak
September 14, 2014

Physics
12 V * 5.9 amps * time in seconds = 4.8*10^3
September 14, 2014

Science
v = Vi + a t 0 = 100 - 5 t t = 20 seconds
September 14, 2014

Math
of course if you can not split a pack, it is 63*5 = 315 apples
September 14, 2014

Math
sells for 2.40/5 = .48 per apple .48 x = 150 x = 313 apples or 63 packs
September 14, 2014

physics
goes 168 *2 meters in 1 second so 336 m/s that day there.
September 14, 2014

math
hits x axis at 3 so goes through (3,0) y = 2 x + b 0 = 2 (3) + b b - -6 y = 2 x - 6
September 14, 2014

Physics - Grade 10
No motion, no work.
September 14, 2014

Math
hyperbola centered at x =12/2 = 6 hits x axis at (5.5 , 0) and (6.5 , 0) (x-6)^2/a^2 - y^2/b^2 = 1 2 a = 1 a = 1/2 a^2 = 1/4 4 (x-6)^2 - y^2/b^2 = 1 center to either focus = 4 =sqrt(a^2+b^2) so 16 = 1/4 + b^2 b^2 = 16 - 1/4 = 63/4 4(x-6)^2 - 4y^2/63 = 1 (x-6)^2 - y^2/63 = 1/4
September 14, 2014

Whoops
Sorry about that.
September 13, 2014

Math
4*4 = 16 compounds 8.5/4 = 2.125% = .02125 1.02125^16 = 1.39995 * 25,000 = 34,998.80 final value - 25,000 = 998.80 interest
September 13, 2014

y is positive down?
If so then melon trajectory u = 12.1 forever x = 12.1 t so t = x/12.1 v = g t = 9.81 t y = 4.9 t^2 so y = 4.9 x^2/146 = .0335 x^2 y^2 = .00112 x^4 when they hit 14.9 x = .00112 x^4 x^3 = 13303 x = 23.7 y = .0335 x^2 = 18.8
September 13, 2014

Algebra1
You are welcome.
September 13, 2014

Algebra1
1x-3x = -2x -4y-3y = -7y 2z+2z = 4z so -2x-7y+4z
September 13, 2014

geometry
ok, you are welcome.
September 13, 2014

geometry
4.4 the shape and size are not changed by turning it, so congruent. 5.5 - no idea without seeing it.
September 13, 2014

math
You are welcome.
September 13, 2014

math
turn slide translation (same question as 2.2 above)
September 13, 2014

physics
3.9 E5 km
September 13, 2014

physics
The point is that 20 min = 1/3 hour
September 13, 2014

physics
3 km/20 min = 3 km / (1/3)hr = 9 km/hr
September 13, 2014

Math
93542
September 13, 2014

physics
v = Vi - g t 0 = 20 - 9.81 t t = about 2 seconds
September 13, 2014

physics
divide by .707 which is 1/sqrt 2
September 13, 2014

physics
R the same i2 = 2 i1 so i2^2 R = 4 i1^2R 4 * 22 = 88 Watts
September 13, 2014

physics
10 Joules is correct to 2 significant figures. Try 10. or 10.0
September 13, 2014

physics
Hey, I took the course and already know how to do these, now you try and ask us if you get stuck showing where you got stuck.
September 13, 2014

physics
645 * 590 = 380,550 W or 381 kW Ke = (1/2)m v^2 = (1/2)(4.5*10^4)(900) = 2025*10^4 = 2.025*10^7 Joules energy needed = (2.025/.91)10^7 = 2.225 * 10^7 Joules 3.8055*10^5 t = 2.225*10^7 t = .585*10^2 = 58.5 seconds, about a minute a = delta v/delta t = 30/58.5 = .513 m/s^2 ...
September 13, 2014

physics
F = G M1 M2 / d^2 d = 2.2+1 = 3.2 mars radius=10.9*10^6 meters = 6.67*10^-11 (3300)(6.42*10^23)10^-12/(10.9)^2 = 1194 * 10^0 = 1194 Newtons
September 13, 2014

Chemistry
mol of H2 is 2 grams 8.08/2 = 4.04 mols so 4.04 mols of H2O produced H2O = 2+16 = 18 grams per mol 18 * 4.04 = 72.7 grams
September 13, 2014

physics
Vi up = .85 sin 34.3 = .479 m/s h = 0 + Vi t - 4.9 t^2 h = .479(.078) - 4.9(.078)^2 in meters, multiply by 1000 to get mm
September 13, 2014

Math
24539
September 13, 2014

AP Calc B/C
by the way I think you want arch from 0 to pi which Wolfram gives as 3.8 something
September 13, 2014

AP Calc B/C
yuuk! http://www.wolframalpha.com/input/?i=int+%281+%2B+cos^2x%29^.5+dx
September 13, 2014

Math
6 is bigger than 5
September 13, 2014

Math
100,000 for reference then *50,000 *53,000 *53,040 so first digit can be any from 1 to 9 one of those two zeros must remain a zero, the other can be any from zero to nine.
September 13, 2014

Physics
Hey, look, this is a phony trick question. There is only one force in this problem, gravity, m g Therefore there is only one acceleration in this problem, g , which is about -9.81 m/s^2 on earth. There is NO HORIZONTAL ACCELERATION There is no change in vertical acceleration ...
September 13, 2014

chemistry
see below
September 13, 2014

Physics
h = Hi + Vi t - 4.9 t^2 up rock h = 0 + 8.62 t - 4.9 t^2 down rock h = 5.53 - 8.62 t - 4.9 t^2 so when are the two heights the same? 8.62 t - 4.9 t^2 = 5.53 -8.62 t -4.9 t^2 2(8.62 t) = 5.53 solve for t then go back and get h
September 13, 2014

math
If they are corresponding they are congruent, 44
September 13, 2014

Curriculum
.... but wait until you meet my six year old grandson.
September 13, 2014

Physics
1220 Joules/second * 1.3*60 seconds = 95,160 Joules 1.220 kW * 1.3 min * 1 hr/60 min = .0264333333333..... kW h * 12.1 cents = .32 cents
September 13, 2014

math
change in x = -2-4 = -6 change in y = 3 + 2 = 5 d^2 = 36 + 25 d^2 = 61 d = sqrt (61)
September 13, 2014

Physics
F = m a = rate of change of momentum first work on a average speed during braking = (14+0)/2 = 7 m/s so time to stop = 23.6 m / 7 m/s = 3.37 seconds change of momentum = -2530*14 =-35420 so F = -35420 / 3.37 = -10510 Newtons mu m g = 10510 mu = 10510 / (2530*9.81) = .423 good ...
September 13, 2014

Help please, :)
Well, at least your little sister knew he fought in that war long before he led the Continental Army against his former allies.
September 13, 2014

math
Note, it talks about restrictions. Watch out for zeros in denominators.
September 13, 2014

math
Great!! You are welcome :)
September 13, 2014

math
(x-4)/(x^2-8x+16) + 3(x+7)/(x^2+12x+35) (x-4)/[(x-4)(x-4)] + 3(x+7)/[(x+7)(x+5)] proceed just like the other one.
September 13, 2014

math
I am guessing since your typing without parentheses is ambiguous (x+3)/(x^2+11x+24) - (2x+10)/(x^2+11x+30) (x+3)/[(x+8)(x+3)] - 2(x+5)/[(x+5)(x+6)] 1/(x+8) - 2/(x+6) [ (x+6)-2(x+8) ] /[(x+8)(x+6)] [-x -10 ] / [(x+8)(x+6)]
September 13, 2014

History, Urgent
You are welcome :)
September 13, 2014

LOL we both found the same article I think.
Sorry about the repeat. The crux of the matter is that although states could be added to the Union, there was no constitutional provision for taking over foreign territory from another country and making it part of the United States.
September 13, 2014

History, Urgent
The Louisiana Purchase Treaty would not be final until it was ratified by the Senate, funded by the House of Representatives, and signed by the President. While the incorporation of these new lands into the United States was a momentous opportunity, Jefferson had reservations ...
September 13, 2014

Two for Damon
As for the other question: 1. is fine although there is much more to being a good coxswain. I would pick 2-2 because it is specific about why you want the big strong guys in the middle. 3. fine 4. fine.
September 13, 2014

Two for Damon
Posted by rfvv on Saturday, September 13, 2014 at 4:20am. 1. Each team in the Boat Race has eight rowers and one more person who does not row, a cox. 2. Each team in the Boat Race is composed of eight rowers and one more person who does not row, a cox. 3. Each team in the Boat...
September 13, 2014

Physics
yes, again -g the whole time. Horizontal direction is another problem entirely.
September 13, 2014

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