Tuesday
October 21, 2014

Posts by Damon


Total # Posts: 18,975

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

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

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