Wednesday
October 1, 2014

Posts by Damon


Total # Posts: 18,728

physics
a = (0-12)/.1 F * t = change in m v F * 0.1 = 60 (0-12)
September 18, 2014

Urgent Spanish Check
Well, for a bunch of Norte Americanos we are not doing too badly.
September 17, 2014

Urgent Spanish Check
hmmm, una clase is feminine but lo is masculine. La is feminine.
September 17, 2014

social studies check
I do not think he accomplished what he was hoping to accomplish. What he did accomplish was not his original objectives.
September 17, 2014

social studies check
Well, he did not find China. He ended up dead someplace west of the Mississippi. He did get a lot done and was the first European explorer in those parts, however the goals of his sponsors to find vast riches of gold, jewels and silver and find a route to the Orient were not ...
September 17, 2014

social studies check
I agree with D. It is hard to sustain a culture when everyone is dead.
September 17, 2014

Urgent Spanish Check
You are welcome.
September 17, 2014

Urgent Spanish Check
EL examen VERDE miS hermanas LOs
September 17, 2014

social studies check
I think the key word is PERMANENT. The woodland people were still in place when the Europeans arrived.
September 17, 2014

social studies check
THey did NOT want to form large plantations as in South Carolina !!
September 17, 2014

physics
Give ALL the units of resistivity. Then the problem solves itself as long as you know Area of circle = pi d^2/4 Resistance = resistivity * length/area
September 17, 2014

English
The only problem I have with these sentences is that they are extremely awkward. I would have said: I think I will be a good bow rower because I can balance the boat accurately. I think I will be good rowing in the middle of the boat because I am strong and can make the boat ...
September 17, 2014

Physics please help
slope of displacement versus time or dx/dt at any point is velocity v = integral of a dt if you were given the ACCELERATION ,a, you would need to do area, but you were not.
September 16, 2014

math
x y z 4 y z y>z 4 + y + z = 6 y + z = 2 since y>z y = 2 and z = 0 4 2 0
September 16, 2014

Pre-Calculus
a) so use -3 for x (-3)^2 + 9 = 9+9 = 18 b) now use -2 for x (-2)^2 + 9 = 4 + 9 = 13
September 16, 2014

Calculus I
dL = a Lo dT L = a Lo T + constant when T = 0, L = Lo so L = (a Lo) T + Lo To is y (or in this case L)axis intercept (a Lo) is slope
September 16, 2014

Curriculum
The average dictator would name the gerbil :)
September 16, 2014

Math
A number and its absolute value are equal. SO IT IS POSITIVE OR ZERO if you subtract 2 from the number, the new number and its absolute value are not equal. IT GOT NEGATIVE WHEN WE TOOK 2 FROM IT, SO IT IS BETWEEN ZERO AND TWO 1.9999999999999999999999999999 :)
September 16, 2014

Curriculum
Way to go Daniela !!!! Much better answers today !
September 16, 2014

Geography
GDP is entirely financial and may say nothing about how well the residents live. For example a country with huge natural resources such as gold mines may have a high GDP but only a few rich people and the vast majority uneducated and underfed. HDI takes into account how well ...
September 16, 2014

Math
and for the third time 25 minutes
September 16, 2014

Math
still 25 minutes
September 16, 2014

Math
3/5 * 5/3 = 1 entire task :) 15 * 5/3 = 25 minutes
September 16, 2014

chemistry
Ice water remains at 0 deg C until all is melted. In other words , yes you are correct.
September 16, 2014

Urgent Spanish Check
gato ends with o
September 16, 2014

Physics
tourist runs d at 5.56 bear runs (d+26.6) at 7.69 same time for both time = (d+26.6)/7.69 = d/5.56 solve for d
September 16, 2014

maths
76-47 = 29 47-29 = 18 29-18 = 11 18-11 = 7 11-7 = 4 7 -4 = 3 <--------
September 16, 2014

Physics
pick some times that meet the criterion north for 30 seconds, south for 10 seconds , total time = 40 seconds distance north from start = 25*30 then back 32*10 total distance north (displacement vector, not distance traveled) = 25*30 - 32*10 so Vaverage = (25*30 - 32*10)/40 = (...
September 16, 2014

Physics
a) 515/229 b) average speed = (0 + final speed)/2 = answer to part (a) in other words answer to b = twice answer to a c) a = change in velocity/change in time = answer to part b /229 seconds
September 16, 2014

Physics
Vi = 2.53 Hi = 5.82 0 = Hi + Vi t - 4.9 t^2 4.9 t^2 - 2.53 t - 5.82 = 0 solve quadratic for t eg : http://www.mathportal.org/calculators/polynomials-solvers/polynomial-roots-calculator.php
September 16, 2014

Coordinate Algebra
y = -3 x + b 4 = -3 (5) + b 4 = -15 + b b = 19 y = -3 x + 19
September 16, 2014

Algerbra
http://davidmlane.com/hyperstat/z_table.html
September 16, 2014

Social Studies
I agree with you.
September 16, 2014

Social Studies
These tricky double negative questions are exasperating.
September 16, 2014

Social Studies
So C is the answer. Farmers were NOT allowed to own slaves.
September 16, 2014

Social Studies
the trustees prohibited Negro slavery, for they believed that this ban would encourage the settlement of "English and Christian" people.
September 16, 2014

Social Studies
No, It was charitable, to help the poor !!!!! One of the reasons they prohibited slavery was to avoid large plantations as had infested South Carolina !!!
September 16, 2014

algebra
ok, sure, you paid 10 for the right to buy tickets (admission to the fair grounds?)
September 16, 2014

differential calculus
tan A = h/50 sec^2 A * dA/dt = (1/50) dh/dt dA/dt = (4/50)cos^2 A at h = 50, cos A = .707 and cos^2 A = 1/2 dA/dt = 4/100
September 16, 2014

differential calculus
p v^1.3 = k p d/dt (v^1.3) + v^1.3 dp/dt = 0 1.3 p v^.3 dv/dt + v^1.3 dp/dt = 0 1.3 p dv/dt = - v dp/dt 1.3 dv/dt /v = - dp/dt /p
September 16, 2014

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

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