Saturday
November 22, 2014

Posts by Damon


Total # Posts: 19,402

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

Physics
-g the whole time
September 13, 2014

physics
show work
September 13, 2014

english
does, will fly or flies do wakes write began starts
September 13, 2014

math (create equation)
4 w + 6 L = 88 w L = 80 so L = 80/w 4 w + 6 (80/w) = 88 w + 6 (20/w) = 22 w^2 - 22 w + 120 = 0 w = [ 22 +/- sqrt (484 - 480) ]/2 w = [ 22 +/- 2]/2 w = 12 or w = 10 if w = 12 L = 6 2/3 4 w + 6 L = 88 check if w = 10 L = 8 4 w + 6 L = 88 check
September 13, 2014

english
shattered :) demolished smashed destroyed .....
September 13, 2014

HISTORY
DesDes, the American Indians were here before Lief Erikson, never mind Columbus :)
September 13, 2014

HISTORY
A long before others B 1492 (we all know) C 1517 D 1534 E 1536 F 1588 (We all know that - right ?) G 1620 (did not have to look that up either :)
September 13, 2014

HISTORY
Columbus went nowhere near Newfoundland in any of his voyages. Columbus was funded by Ferdinand and Isabella of Spain. If he had been anything but Catholic he would have been lucky to escape from their court with his life.
September 13, 2014

History
yes I think B https://history.state.gov/milestones/1784-1800/pickney-treaty
September 13, 2014

Chemistry
5000 = (specific heat of gold)(T-25)(33.5)
September 13, 2014

History, Urgent
Spain had already transferred Louisiana to the French. Anyway, here: http://www.monticello.org/site/jefferson/louisiana-purchase
September 13, 2014

HISTORY
I agree. That is a central thesis of the book: " The Sea and Civilization" by Lincoln Paine, published by Alfred Knopf, 2013
September 13, 2014

Physical Science
2NaOH + MgCl2 -> Mg(OH)2(s) + 2NaCl It would be a double replacement reaction and I doubt if it occurs in real life. Everything but the resulting solid precipitate Mg(OH)2 is ions in solution.
September 13, 2014

English
I would pick (6). However if I were writing it I would say: Each shell has eight rowers and a coxswain who does not row but steers the boat while keeping the rowers working together.
September 13, 2014

English
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

History
https://www.mtholyoke.edu/courses/rschwart/hist151s03/french_rev_causes_consequences.htm
September 13, 2014

HISTORY
When sea level was lower, it was relatively simple to cross the Bering Strait from Asia to Alaska. That is the most likely scenario although it is possible that some Polynesians could have landed on the west coast of South America. They settled most of the Pacific Ocean ...
September 13, 2014

Statistics Lab Week 2
You need the mean (average) and the standard deviation http://davidmlane.com/hyperstat/z_table.html
September 12, 2014

English 1
Make a guess !
September 12, 2014

Physics
a = change in velocity / change in time = 37 m/s / .177 s
September 12, 2014

math TYPO I think
suspect you mean a cone v = (1/3) pi r^2 h (need that r^2) 3 v = pi r^2 h h = 3 v / (pi r^2)
September 12, 2014

math
520 t + 620 (t-1) = 1800
September 12, 2014

math
t and (126 -t) 4 t = 2 (126-t) solve for t then d = 4 t or d = 2(126 - t)
September 12, 2014

math
x and 14000-x .04 x + .025 (14,000-x) = 458 solve for x and then do 14,000-x
September 12, 2014

Algebra
x (a + b +2) distributive of multipication (x+3)(a+b) distributive again and I also used commutative to make 3+x --> (x+3)
September 12, 2014

math More infor needed
I assume the second object is stationary ? We need to know how soft it is. In other words we need to know the time duration of the crash. F * time spent scrunching = momentum of 40 ton object
September 12, 2014

Mathematica
(1/3) (x+1) = 3/5 x+1 = 9/5 x = 4/5 = .8 .8*100 = 80 % check add .8*1/3 to 1/3 .8/3 + 1/3 = 1.8/3 18/30 = 3/5 sure enough
September 12, 2014

math
You are welcome :)
September 12, 2014

math
my calculator says yes that works :)
September 12, 2014

math
.4 + 5/100 + 5/1000 + 5/10,000....... .4 + 5/100 +(5/100)(1/10) .. .4 + infinite geometric series with a = 5/100 and r = 1/10 .4 + sum of series .4 + a/(1-r) .4 + 5/100 / (9/10) 4/10 + (5/9)/ 10 (4 5/9 )/10 41/90
September 12, 2014

Pre-Calculus/Trigonmetry
You are welcome :)
September 12, 2014

Pre-Calculus/Trigonmetry
If it is parallel to the x axis then it is y= something in this case y = 4
September 12, 2014

Algebra
28 * 2 = 56 84 - 56 = 28 28/2 = 14 so we have 28*14 if rectangle 28* 14 = 392 yd^2
September 12, 2014

chemistry
copper sinks so volume is increased by copper volume. volume of copper = 6.5 g * 1 mL/8.96 g = .725 mL so .725 + 13.4 = 14.1 mL
September 12, 2014

Pre-Calculus
m' = -1/m m' = -1 /(1/2) = -2 correct 2. yes true 3. m = (1-5)/(-3-1) = -4/-4 = 1 so false
September 12, 2014

Physics
x is generally taken positive to the right (east) F1x= -416 sin 10 = -72.2 F2x = 356 sin 30 = 178 so Fx = 106 F1y = 416 cos 10 = 410 F2y = 356 cos 30 = 308 We must be operating on different number systems :( Fy = 718 tan angle up from x axis (east) = 718/106 = so angle up from...
September 12, 2014

physics TYPO
northeast is not 300 degrees. It is 45. what are you talking about ?
September 12, 2014

math
.9 x = 36 x = 36/.9 = 40
September 12, 2014

physics
average velocity = -617/105 = -5.88 m/s and average speed = 5.88 m/s ================================ in anticipation of a part B: x = Xi + Vi t + (1/2) a t^2 -617 = 0 + 0 t + (1/2)a (105)^2 a = -1234/105^2 a = - .112 m/s^2
September 12, 2014

Physics help please!
I assume you are talking about a nuclear reaction. In that case some mass is released as energy by the relationship E = m c^2
September 12, 2014

Algebra
yes, or complete the square -(1/2) x^2 + 20 x = A - 800 x^2 - 40 x = -2 A + 1600 x^2-40x+20^2 = - 2A + 2000 = -2(A-1000) (x - 20)^2 = -2 (A-1000) vertex at x = 20, A = 1000
September 12, 2014

Math, Physics
distance = rate * time d = 1.9 *initial speed * cos 46 now vertical problem Vi = initial speed * sin 46 v = Vi - 9.8 t at top 0 = Vi - 9.8* (1.9/2) time up is half total time so Vi = [ 4.9 * 1.9 ] so initial speed = [ 4.9 * 1.9 ]/sin 46 then go back to d = 1.9 *initial speed...
September 11, 2014

Physics repeated question
been there, done that.
September 11, 2014

Physics
v = Vi - 9.81 t 0 = 1.23 - 9.81 t solve for t then double it if you want to come back down.
September 11, 2014

Math
top line (1 + 2) + (3 + 4) = 10 = (1+3) + (2 + 4) = 10 associate property of addition d. as for the rest c. add y values 2+4 = 6 now 1 + 6 + 3+6 = 16 NO e. sum of x values + sum of complex conjugates of y values?
September 11, 2014

algebra 1
rod d = v * 5 hours Marsha d = (v+42) * 2 hours so 5 v = 2 v + 84
September 11, 2014

Maths
sin theta = 2.1/3.8 = opposite/hypotenuse ================================ same thing sin theta = 0.75/5.4
September 11, 2014

math
4 x^2 - 4 x + 5 = 0 x = [ 4 +/- sqrt (16 -80) ]/8 = 1/2 +/- (1/8)sqrt (-64) = 1/2 +/- i
September 11, 2014

maths b
http://davidmlane.com/hyperstat/z_table.html
September 11, 2014

maths a
http://davidmlane.com/hyperstat/z_table.html careful about parentheses z= (x-u)/SD = (34.5 -46.5) /8.7 = - 1.38
September 11, 2014

maths a
English z = (68-52)/10 = 1.6 SDs above average Math z = (68 - 55)/8 = 1.625 SDs above average, better
September 11, 2014

2
a = 6500/60 then divide by 9.8
September 11, 2014

2
forget speed of light in this context, so much faster than sound that basically it is infinite. All that matters is the creeping speed of sound. 6.5 s * speed of sound in air = distance then divide that distance by 3*10^8
September 11, 2014

1
6.5 * 343 (Ignore speed of light)
September 11, 2014

phusics
x = Xi + Vi t + .5 a t^2 10 = 20 t - 5 t^2 solve for t or just use average speed up = 5 m/s so time = distance/speed = 10/5 = 5
September 11, 2014

Science
work done = change in Ke (1/2) (.5)(v^2) = 810 * 4 * 10^-3
September 10, 2014

Physics
980 * .25 Newtons
September 10, 2014

Physics
a = 3 m/s^2 Vi = 0 d = 24 m d = (1/2) a t^2 24 = (1/2)(3)t^2 t^2 = 48/3 = 16 t = 4 seconds v = Vi + a t v = 0 + 3 (4) v = 12 m/s
September 10, 2014

math
(1/3)Jill + 10 = 55 Jill / 3 = 45 Jill = 3 * 45
September 10, 2014

Algebra 2
x = [ -10 +/- sqrt (100 + 80) ]/2 x = -5 +/- .5 sqrt(180) x = -5 +/- .5 sqrt ( 9 * 4 * 5) x = -5 +/- 3 sqrt 5
September 9, 2014

science
200 meters in 5 seconds average speed = 200/5 = 40 m/s so speed is 80 m/s at 200 m it slows down after that so 80 is your answer goes at 80 for 300 m time = 300/80 = 30/8 = 15/4 seconds between 200 and 500 now from 500 m and 80 m/s, brakes down to zero at -2 m/s^2 0 = 80 - 2 t...
September 9, 2014

8th grade math
147 * 5/3 = 216 * 5/3 = (note, everything is nicely divisible by 3) then subtract
September 9, 2014

Grade
average of four scores = sum of 4 scores / 4 = 340/4
September 9, 2014

Alegbra
what if it were x^2 - 2 x - 3 ?? (x-3)(x+1) now try
September 9, 2014

8th
120 min total weight time = 120 - 21 - 45 then 100 (weight time) / 120
September 9, 2014

Chm Help Please!!!
I assume that 205 C boiling point is at atmospheric pressure. If you reduce the pressure with a vacuum pump maybe you can get the stuff to boil at lower than 150 degrees. That also cuts down on the reaction with air if there is little present :)
September 9, 2014

math
done
September 9, 2014

math
They are the same.
September 9, 2014

Math Problem (please help)
since e^ln x = x e^ln e = e^1 = e
September 9, 2014

Math 6th grade
11 is just the first one :) There are lots.
September 9, 2014

Math 6th grade
divide by five, remainder 1 6, 11, 16, 21, 26, 31 , ....... divide by 4, remainder 3 7 , 11 , 15 , 19 , 23 , 27 , 31 score ! 31 makes 7 rows of 4 with 3 left over 31 makes 6 rows of 5 with 1 let over
September 9, 2014

Math Problem (please help)
You are welcome :)
September 9, 2014

Math Problem (please help)
e^rt = e^(.03*30) = e^.9 = 2.4596 times 30,000 = $ 73,788.09
September 9, 2014

PRECALCULUS
2 x + 2 y = P y = 18/x 2x + 36/x = P
September 9, 2014

physics
Has unknown speed Vi at h = .18 m while coasting upward: 0 = Vi - 9.8 t so t = Vi/9.8 2.3 = .18 + Vi t - (1/2) 9.8 t^2 2.12 = Vi^2/9.8 - (1/2) Vi^2/9.8 (1/2) Vi^2 = 9.8*2.12 Vi = 6.45 m/s at .18 meters so average speed between ground and .18 meters = 6.45/2 = 3.22 m/s so time ...
September 9, 2014

Math...Help.Thx
P = k T 90 = k (60) k = 9/6 = 1.5 pages/min if T = 90 P = 1.5*90 = 135 ===================== C = k N 14 = k (4) k = 14/4 = 7/2 so C = 3.5 N if n = 7 C = 3.5 * 7 = 49/2 = 24.5
September 9, 2014

Science
I do not know the specific heat of water in obsolete units of BTU/(pound deg F). You do, use it in BTU heat input = Specific heat of water * 450 pounds * (104-60) degrees
September 9, 2014

maths literacy
circumference = 2 pi R
September 9, 2014

Science
Igneous gets spewed hot from the earth and solidifies as it cools. Sedimentary is deposited cool from oceans and streams and hardens with age and pressure. Your book must say something like that. see: http://geology.com/rocks/igneous-rocks.shtml and http://geology.about.com/cs...
September 9, 2014

Calculus
yes 20,000 (1.075)^10
September 8, 2014

physics
u = 20 cos 30 until it hits the ground. Vi = initial vertical velocity = +20 sin 30 = +10 initial vertical displacement = 45 final vertical displacement = 0 0 = 45 + Vi t - 4.9 t^2 solve for t v = Vi - 9.8 t solve for v speed = sqrt (u^2 + v^2)
September 8, 2014

Math
y = 800 * 2^(x/4) ??? ln y = ln 800 + (x/4) ln 2 (x/4) ln 2 = ln (y/800) x = ln (y/800)^4 / ln 2
September 8, 2014

math
(4/sqrt 2)(sqrt 2/sqrt 2) = (4/2)sqrt 2 = 2 sqrt 2
September 7, 2014

AP Physics C
oh, put all those in units of b, city blocks :)
September 7, 2014

AP Physics C
Well, you will have to draw the map for displacements add x components and y components separately and for distances: find each and add move 1 distance = 6.3 displacement east = -6.3 i displacement north = 0 j move 2 distance = 4 displacement east = -4 cos 40 = -3.06 i ...
September 7, 2014

Quick math help
1. AC= 3x+6 and CD=2x+14 x=_______ AC=______ Answer: x=8 AC= 30 yes :) ============= 2. AC= 5x-8 and CD=16-3x x=______ AD=_____ Answer: x=3 What will AD be because I'm sooo confused on how to work it out.. ========================== 5x-8 = 16-3x 8 x = 24 x = 3 AD = 5x-8+16...
September 7, 2014

English
Yes it is it would be better if two sentences :) or Yes it is a run on sentence. It would be better to write two sentences.
September 7, 2014

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