Wednesday
October 1, 2014

Posts by Damon


Total # Posts: 18,728

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

Algebra
w (2w-1) = 21 2 w^2 - w - 21 = 0 (2 w -7)(w+3) = 0 w = 7/2 = 3.5 then L = 6
September 7, 2014

Math
-4 (10) = -40 -4*2 = -8 so -40 = -8 - 4 N 40 = 8 + 4 N 4 N = 32 N = 8
September 7, 2014

physics
v = Vi + a t 0 = 60 -10 t because v = 0 at top t = 6 seconds at top then h = 0 + Vi t +(1/2)a t^2 h = 60 (6) - 5 (36) h = 360 - 180 = 180 meters or simply average speed up = 60/2 = 30 m/s 30 m/s * 6 seconds = 180 meters
September 7, 2014

college physics
Galileo says: Who cares what the mass is ? How far does anything fall in 2.4 s if dropped on a planet where g = 9.81 m/s^2 ?? d = (1/2) a t^2 d = (1/2)(9.81) (2.4)^2 (b) d = 4.1 4.1 = (1/2) (9.81)(t^2) solve for t v = Vi + a t v = 0 + 9.81 t (c) v = 0 + 9.81 t = 9.81 (1.7) Now...
September 7, 2014

physics
v = 0 + a t 11 = a (2.58) a = 11/2.58 d = (1/2) a t^2 = (1/2)(11/2.58) (2.58)^2 or simply =the average speed = 5.5 5.5 * 2.58 will give the same answer :)
September 7, 2014

Physics
final momentum = initial momentum book moves in + direction, man moves in - direction 2*11.1 + 84.9 v = 0 v = -22.1/84.9
September 7, 2014

Calculus
if f(x) = x^.5 then f(x+h) = (x + h)^.5 [f(x+h) - f(x)]/h = [(x+h)^.5-x^.5]/h binomial expansion of (x+h)^.5 = x^.5 + .5 x^-.5 h ..... higher powers of h so [ x^.5 + .5 x^-.5 h ...-x^.5 ]/h or .5 x^-.5 + higher powers of h = .5 x^-.5 as h --->0 if x = 121 f(x) = 121^.5 = 11...
September 7, 2014

The Curriculum
I am tempted to say: "All of the above", but would probably guess C.
September 7, 2014

The Curiculum
You are welcome :)
September 7, 2014

The Curiculum
Agree.
September 7, 2014

The Curiculum
Oh come on, guess and we will argue about it.
September 7, 2014

math
I do not know what your problem looks like.
September 7, 2014

math
length 5x ends 4x by 3x two sides 5x by 4x -->2*5x*4x = 40x^2 top and bottom 5x by 3x --> 2*5x*3x = 30x^2 two ends 2*4x*3x =24x^2 so 94 x^2 = .94 x^2 = .01 x = .1 .5 * .4 * .3
September 7, 2014

teaching in early childhood programs
looks like exploratory play to me, but my thing is physics.
September 7, 2014

•teaching in early childhood programs
I would have said D because they talk about influencing how the kids move around.
September 7, 2014

teaching in early childhood programs
I would choose C but your guess is as good as mine.
September 7, 2014

teaching in early childhood programs
I would not make statement C.
September 7, 2014

Math
2 w + L = 40 so L = 40-2w A = w L = w (40-2w) -2 w^2 + 40 w = A w^2 - 20 w = -A/2 w - 20 + 100 = -(1/2)(A-200) (w - 10)^2 = -(1/2)(A-200) w = 10, L = 20, A = 200
September 7, 2014

maths
area = 1200 = x^2 + 4 x h so h = (1200-x^2)/4x v = x^2h v = (1/4)x(1200-x^2) dv/dx 0 at min or max 0 = x(-2x) + 1200 - x^2 3 x^2 = 1200 x^2 = 400 x = 20 h = 400/80 = 5 v = 400 *5 = 2000
September 7, 2014

maths
http://www.gregthatcher.com/Mathematics/GaussJordan.aspx
September 7, 2014

geometry - need help with this.
a+b = 90 a = 4 b 5 b = 90 b = 18 a = 4*18 = 72
September 7, 2014

Math
20 for 1.00 then 4*.80 = 3.20 for 21 through 100 so 4.20 for 100 y = 4.20 + .03 (x-100) y = .03 x - 1.20
September 7, 2014

Engineering
yes, the zero derivative can be either a maximum or a minimum If x = 6, we have the minimum, in fact zero If x = 2, it seems we have a maximum which is the answer you want.
September 6, 2014

Law of Sines
sin A/15 = sin 35/9 = .0637 sin A = .956 so A = 72.9 degrees or 180-72.9 = 107.1 then A + B + C = 180 72.9 + B + 35 = 180 B = 72.1 degrees (One answer) sin B/b = .0637 so b = 14.94 or A = 107.1 then B = 180 - 35 -107.1 = 37.9 degrees (alternate answer)
September 6, 2014

physics
(1/2) m Vnew^2 = (1/2) m Vold^2 + W
September 6, 2014

Physics
v = Vi - 9.81 t at top, v = 0 t = 8 / 9.81 (b) h = 1.5 + 8 t -(1/2)(9.81) t^2 (c) at 2.4 m, new t 2.4 - 1.5 = 8 t - 4.9 t^2 then v = 8 - 9.81 t
September 6, 2014

Physics for Technology
What is the momentum of a hammer of mass 0.8kg striking a nail at 5 m/s2? So, p = m v p = (0.8)(5 m/s) p = 4 kg-m/s note velocity is meters/seconds, acceleration is m/s^2 A nail stops the hammer in 0.08 seconds: what force is delivered to the nail? NEWTON #2 Force = rate of ...
September 6, 2014

Physics Help!!!!
going forward faster and faster going forward but the brakes are on going backward faster and faster going backward but the brakes are on
September 6, 2014

Teaching 4Grade Math
If you save 5% the first week you are down to 95% If you then save 5% of that the second week you are down to 95% of 95% = .9025 or at 90.25% of full charge which means you saved (1/2)(1-.9025)(100) = 4.875% per week on the average. That is hardly fourth grade. It is more in ...
September 6, 2014

Math
3/10 are boys 7/10 are girls total boys = x total girls = x+200 total students = 2x+200 (3/10)(2x+200) = x 6 x + 600 = 10 x 4 x = 600 x = 150
September 6, 2014

math 1 question
yes 2.5 times r = 2.5 r
September 6, 2014

Math
1.45 c = 79.95 c = 79.95/1.45
September 5, 2014

ALGEBRA
five and six is eleven (x+5)(x+6) seven - two (x-7)(x+2) I bet you mean 9x^2-16 which is difference of two squares a^2-b^2 = (a+b)(a-b) (3x+4)(3x-4)
September 5, 2014

Physics
v = Vi - 9.81 t 20 = Vi - 9.81 (2.1) solve for Vi then Use that Vi to get v at t = 4.7
September 5, 2014

physics
east components 2880 cos 42 = 2140 south components 2880 sin 42 + 4360 = 6287 magnitude = sqrt (2140^2+6287^2) tan (angle) = 6287/2140
September 5, 2014

Physics
I mean west is - x direction :)
September 5, 2014

Physics
West is - y direction Ax = -20.0km*sin(35.0º) NOTE NEGATIVE Ay = 1.650km or 20.0km*cos(35.0º)? Bx = 18.0km*cos(75.0º) By = 1.420km or 18.0km*sin(75.0º)? Rx = Ax + Bx Ry = Ay + By and Rz = 1.650 - 1.420 R = sqrt (Rx^2 + Ry^2 + Rz^2)
September 5, 2014

INTEGRAL CALCULUS PLEASE HELP!!!
I assume you mean the integrals or areas are 4 , 9 and 1 Sketch it all I can say is that the integral from 4 to 17 (not 9 to 17) is -12 because 4 + integral 4 to 17 + 9 = 1 I do not even know what 2) means. If it is integral F(x) dx - 4 intregral dx then answer above - (4(17...
September 5, 2014

Physics
On earth that 40 N weight would correspond to about m = W/g = 40/10 = 4 kilograms of mass which is around 8 pounds. This collie is actually a toy poodle. 200 kg ? That is about 450 pounds weight on earth which means the average patient stepped on the scale with her husband and...
September 5, 2014

Algebra
Just did, see below.
September 5, 2014

Physics
well, sure, but there is much more to it. As you stated the problem: x = (1/2) a t^2 so a = 2 x/t^2 or t = sqrt (2 x/a) but that is a gross oversimplification of what is going on with constant acceleration a if a = some constant acceleration v = Vi + a t where Vi is initial ...
September 5, 2014

math
hard to say
September 5, 2014

algebra
line of form y = m x + b m = (Y2/Y1)(X2-X1) = (4-0)/(2-1) = 4 check with other points (like (12-0)/(4-1) ) y = 4 x + b put a point in to find b 0 = 4(1) + b b = -4 so y = 4 x - 4
September 5, 2014

algebra
y = x (.658 - .000407 x) where is y = 0 ? at x = 0 and at x = .658/.000407 = 1617 ft long (that is part B) this is a parabola that crosses the x axis at 0 and 1617 so the vertex, max height, is halfway between at x = 808 what is the height? y = -.000407 (808^2) + .658(808) = ...
September 5, 2014

math 101
7.9 * sqrt 2
September 5, 2014

English
Does the second sentence not seem a bit strange? Does it need the word "ever" ?
September 5, 2014

math
5 3/12 - 3 10/12 is 4 15/12 - 3 10/12 is 1 5/12
September 5, 2014

Math PLease help
put in the form y = m x + b then m is the slope 3 y = -6 x + 12 2 y = -2 x + 4 y = -2 x + 4 y = -1 x + 2 -2 is not - 1 so not parallel -2 is not -1/-1 so not perpendicular
September 5, 2014

Math PLease help
6 x - 14 = 30 x + 54 + 28 assuming that = is a + 24 x = -96 x = -4
September 5, 2014

Physics
The first phase is easy if you have constant acceleration because the average speed until the stop is Vi/2 = 5 m/s t to stop = 148.3 / 5 = 29.7 seconds a = change in velocity/change in time = -10/29.7 = -.337 m/s^2 phase 2 displacement = 37.7 - 148.3 = -110.6 meters -110.6 = (...
September 4, 2014

Physics
because when the one that was fired upward gets down to cliff level it is traveling downward at the same initial speed down as the first one was.
September 4, 2014

Math
tan 72.5 = h/5
September 3, 2014

physics
Newton #2 - Force = rate of change of momentum so force * time = change in momentum (impulse) 100 * 5 = 25 * v
September 3, 2014

Homework
c = Q / [ w(T1-T2) ]
September 3, 2014

Algebra
6 * 2.8/4
September 2, 2014

math
9+21 = 30 456 is about 500 87 is about 100 about 30 thousand six hundred 30,600
September 2, 2014

social studies
Well, he failed to establish a permanent presence in North America and he and the other Vikings who followed him made enemies of the natives so that a permanent establishment probably would have required an army (or smallpox or measles to eliminate the locals). I am not sure ...
September 2, 2014

algebra
depends if your text includes zero as a natural number negative numbers are not natural numbers either 0 through 10 which is 11 or one through 10, which is ten
September 2, 2014

math
2 x + 4 y = 14 3 x - 4 y = 6 --------------- add 5 x = 20 x = 4 now go back and get y
September 2, 2014

math
These lines are the same. There are an infinite numbers of solutions, a y for every x you pick.
September 2, 2014

Math
70,016,090 32,000,232,000
September 2, 2014

Shurley English
That is an analogy. I did not say it was good analogy :)
September 2, 2014

Shurley English
a way something is like something else. Your arteries and veins are analogous to the water supply and wastewater piping system in your city :)
September 2, 2014

Algebra 2 Answer Check
You do not need me to operate the calculator Victoria :)
September 2, 2014

ratios
There are probably more cars than trucks, like 3/1
September 2, 2014

math
^%$*&@ math teachers think they are navigators. The "heading" is 215, NOT the "bearing". You take a bearing on something outside the ship, for example it might be the direction of a lighthouse. south is 180 so 35 degrees west of south answer = 145 cos 35
September 2, 2014

Algebra 2
sqrt 8100 = 90 ft baselines so 90 sqrt 2
September 2, 2014

Algebra 2
90/6 = 15 ft^2 each so the side of each square is sqrt 15 2 sqrt 15 + 3 sqrt 15 + 2 sqrt 15 + 3 sqrt 15 :)
September 2, 2014

Algebra 2 Answer Check
11 yes
September 2, 2014

Algebra 2 Answer Check
1. 2/√3 A: 2√3 / 3 yes 2. -18/√6 A: -3√6 yes Add or subtract. 3. 4√3 - 9√3 A: -5√3 yes 4. √8 - 15√2 A: -13√2 yes 5. √45 + √20 A: 5√5 yes 6. 2√48 + 2√12 = 2 sqrt (4*12) + 2 sqrt 12 = 4 ...
September 2, 2014

Algebra 2. HELP
You are welcome.
September 2, 2014

Algebra 2. HELP
I think you can graph straight line t = 0 to t = 8 (end of shift, you still have 18 left for the next shift :( n = 42 to n =18 -3(5) + 42 = 27
September 2, 2014

What is P?
1.05^3 = 1.157625 1.157625 * x = 8600 x = 7429.00
September 2, 2014

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