Tuesday
November 25, 2014

Posts by Damon


Total # Posts: 19,551

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

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

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