Monday
October 20, 2014

Posts by Damon


Total # Posts: 18,972

science
I am assuming that you are correct; the water evaporates
October 2, 2014

physics
That depends If you are in an car: If it is taking off from a stop light and accelerating forward then Thrust is greater than Drag If it is cruising along at constant velocity then Thrust forward equals drag back If you take your foot off the gas and coast then Thrust becomes ...
October 2, 2014

physics
drag is normally opposite to velocity.
October 2, 2014

Algebra
You are welcome.
October 2, 2014

Algebra
5m and 3 m are indeed like terms (combine like terms to make 8 m + 6 p + 4)
October 2, 2014

Math
(A) 2/5 (B) 2/5 = 24/60 (C) 2/5= what/35 multiply 2/5 by 7/7 and get 14/35 so 14
October 2, 2014

Intro to Physical Science
m g h = potential energy at top = 100 * 9.81 * 12 = 11,772 Joules loses 3550 Joules so (1/2) (100) v^2 = 11,772 - 3550 = 8222 Joules v = 12.8 m/s
October 2, 2014

Math
17 * 85/6
October 2, 2014

n2 maths
pi (25)^2/4 * 40 = n (4/3) pi (3)^3 6250 = 36 n
October 2, 2014

math n2
tan 58 = h/380
October 2, 2014

physics
d = .5 a t^2 a = 6/t .01 = .5 (6/t)t^2 = 3 t t = .00333 s F = change in momentum/change in time = .45 *6/.00333 = 810 Newtons
October 1, 2014

physics
10^3*10^8 = 10^11
October 1, 2014

Physics
h = (1/2) g t^2 in metric, g = 9.81 meters/s^2 in English g = 32 feet/second^2
October 1, 2014

calc / physics
yes yes
October 1, 2014

Algebra
- x^4 always - (-x)^4 always + x either -x either
October 1, 2014

Math
f(8+h) = sqrt (8+h) - 8 f(8) = sqrt(8) - 8 subtract sqrt (8+h) -sqrt (8) but d/dh (8+h)^.5 = .5 (8+h)^-.5 so sqrt (8+h) = sqrt 8 + .5 h/sqrt(8+h) subtract sqrt 8 .5 h/sqrt(8+h) divide by h .5/sqrt (8+h) let h -->0 .5/sqrt 8
October 1, 2014

math
x = [ -5 +/- sqrt(25 + 8) ]/4 = [ -5 +/- sqrt (33) ]/4
October 1, 2014

physics
a = change in velocity / change in time -.87 = change in velocity / 3.8 so change in velocity = -3.3 m/s
October 1, 2014

Chem 400
It is there 0.6548 g/mL *10^-3 mL/ uL =.6548 *10^-3 g/uL
October 1, 2014

Chem 400
hexane is 86 g/mol we have 55 uL *.6548 *10^-3 g/uL = 36*10^-3 g 36*10^-3/86 =4.2 * 10^-4 mol * 6*10^23 = 2.51*10^20 molecules of hexane now just add up the protons in a molecule and divide. It is C6H14 C has 6 each and H has 1 each
October 1, 2014

math
-50 3/4 = -203/4 = - 5075/100 -6.05 = -605/100 100 = 10,000/100 so (-5075 -605 + 10,000)/100 = 4320 / 100 = 43.2
October 1, 2014

Printing press
Good grief !!! Google Gutenburg
October 1, 2014

Math
8 j + 4 d = 64 4 j + 8 d = 92 multiply first eqn by 2 16 j + 8 d = 128 4 j + 8 d = 92 --------------- subtract 12 j = 36 j - 3 dollars per jump rope then d = 10 dollars per doll You can do it now
October 1, 2014

math
7 a + 3 s = 1625 s = 2 a so 7 a + 3 (2 a) = 1625 7 a + 6 a = 1625 13 a = 1625 a = 125 so s = 250
October 1, 2014

Chemistry
Huh ?? a mole of anything is about 6*10^23 of them like a dozen is 12 of something 2.65*10^15 ----------- 6 * 10^23 = .442 *10^-8 = 4.42 * 10^-9 moles
October 1, 2014

Math
546*714 /(42*42) = 221 but, is that exact? 546 / 42 = 13 714 / 42 = 17 yes, tiles do not have to be cut.
October 1, 2014

math
100 + 10(150 - 50)
October 1, 2014

Math help!
c - distributive d - commutative
October 1, 2014

History
I am no scholar of the period but am having trouble imagining the Italian cities working together to do this. Do you mean Venice and Genoa cooperating ?
October 1, 2014

chemistry
Xe = 131 g/mol F = 19 g/mol so XeFn = (131 + 19 n) g/mol or (131+19n)g / 6*10^23 molecules but this stuff is .368 g/9.03*10^20 molecules .368/9.03*10^20 = (131+19n) /6*10^23 131+19 n = 244.5 g/mol 19 n = 113.5 n = 6 so XeF6
October 1, 2014

History
That is just a symptom of the importance though. There is much more but I would have to write a book for you.
October 1, 2014

History
LOL gmta
October 1, 2014

History
What language do they speak there now?
October 1, 2014

Math (for Damon)
You are welcome :)
October 1, 2014

Math (for Damon)
weight of single Steven box (English unclear) = s so weight of a Nathan box = s+12 so weight lifted by Nathan = 13(s+12) agree but sentence could mean total weight of boxes lifted by Steven = s then each steven box weighs s/15 then a nathan box weighs (s/15) + 12 and total ...
October 1, 2014

English
can play looks like a compound verb to me
October 1, 2014

Math
change in x = 3 change in y = 5 hypotenuse = sqrt (9+25) = sqrt (24) = sqrt (4*6) = 2 sqrt 6
October 1, 2014

Math ????
What do you want to know? The slope between those two point? the distance between them?
October 1, 2014

physics
v = Vi + a t =3.25 + 3.2*4.4
October 1, 2014

Math plz.
z(1-2+4) + 6 3 z + 6
October 1, 2014

Math question? :c
7*c + 7*4 = 7 c + 28
October 1, 2014

math
2588 - 188 = 2400 2400 / 24 = 100 per payment
October 1, 2014

math
.75 p = p - 180 yes I do not know what the second question is.
October 1, 2014

1 math question
8*6 = 48 8*2 = 16 so 8(6-2) = 48-16 = 32
October 1, 2014

physics
here http://en.wikipedia.org/wiki/Geostationary_orbit 35,786 kilometers above earth
September 30, 2014

physics
look up geostationary satellite
September 30, 2014

physics
F = m v^2/r
September 30, 2014

Algebra
Yes.
September 30, 2014

Algebra
(-7,3) I think I do not do interval notation either.
September 30, 2014

Algebra
(x+2) < 5 and -(x+2) <5 x < 3 and (x+2) > -5 x < 3 and x > -7 which is -7 < x < 3
September 30, 2014

Physics-Intro
good grief, I have not seen those units for a while still F = m a force and weight in pounds, mass in slugs acceleration in ft/s^2 F = 25,000 * 28 = 700,000 pounds
September 30, 2014

physics
.424 * 10^8 m/s = 4.24 * 10^7 or a bit over a tenth of the speed of light.
September 30, 2014

Algebra 2 Answer Check
2 y = -5 x + 8 y = -(5/2) x + 4 slope = -5/2 so slope of perpendicular = 2/5 y = -(2/5) x + b 3 = -(2/5)5 + b 3 = -2 + b b = 5 y = -(2/5) x + 5
September 30, 2014

Algebra 1
1 a try x = -1 1 </= -1 nope b x = -1 works but x = 10 fails totally c x^2 </= 23.25 x^2 x^2 always + so this works by the way d is 4 x^2 -24 x + 36 >/= 4 x^2 - 3 -24 x + 39 >/= 0 nope
September 30, 2014

Typo
If you are really serious about only 11 meters^2 then (w+6)w = 11 w^2 + 6 w - 11 = 0
September 30, 2014

Physics
F = m a Ft = tug force = - Fa asteroid force 3360 vt + 6300 va = 0 momentum remains 0 490 = 3360 at -490 = 6300 aa at = .146 m/s^2 aa = -0.778 m/s^2 vt = 0 + .146 t va = 0 - .778 t position t = .5 (.146)t^2 430 - position a = .5 (-.778)t^2 they are headed toward each other so ...
September 30, 2014

Trigonometry
if theta is between 0 and -90 (quadrant 4) the sin is negative. Therefore we only look at quadrant one. sin^-1 0.95 = 71.8 degrees
September 30, 2014

chemistry
first balance 2 NaClO + H2O --> 2 Na+ +2OH- + Cl2 + O2 How many mols of NaClO ? Na = 23 g/mol Cl = 35.5 O = +16 so NaClO = 74.5 g/mol 2 NaClO = 149 g then grams of NaClO = .0585 *1.12*15 = .983 grams of NaCl .983/74.5 = .0132 mols of NaClO we get half as many mols of O2 so ...
September 30, 2014

Algebra
L = w + 4 L w = 165 (w+4)w = 165 w^2 + 4 w - 165 = 0 (w+15)(w-11) = 0 w = 11
September 30, 2014

Physics
phase 1 v = 5 t , slope up of 5 up to Vi = 25 phase 2 v = constant = 25 from t = 5 to t = 20 phase 3 v = 25- 5(t-20), slope down of -5
September 30, 2014

Pre-Calculus/Trigonometry
You are welcome :)
September 30, 2014

Pre-Calculus/Trigonometry
would it be like this for a, and if so how would i continue that? (f o g)(x)= 1/[(f o g)(x)-5]? ======================= no, just do what it says f (g(x)) use g(x) = (x^2+2) for argument of f in other words f (x^2+2) = 1/[ (x^2+2) - 5 ]
September 30, 2014

Pre-Calculus/Trigonometry
replace x by x^2+2 1/[ (x^2+2) -5 ] = 1/(x^2 - 3) b. f(6) = 1/1 = 1 g(1) = 1+2 = 3
September 30, 2014

precal
9 9r 9r^2 9r^3 -72 = 9 r^3 r^3 = -72/9 now work back a9 = 9/r a8 = 9/r^2 a7 = 9/r^3 interesting a7 = 9/r^3 = (9)(-9/72) = -81/72
September 30, 2014

physics
I could swear I did this one yesterday :( ball 1 d = distance down d = .5 g (t+1)^2 ball 2 d = 40 t + .5 g t^2 so .5 g (t^2 + 2 t + 1) = 40 t + .5 g t^2 put in whatever you use for g (9.81, 9.8 or 10) and solve the quadratic
September 30, 2014

ALgebra 2
From 0 go left 1/2 then go left another 3/4 see that you are now at -1 1/4
September 30, 2014

ALgebra 2
-2/4 - 3/4 = -5/4 = -1 1/4 Sketch this on a number line !!!!
September 30, 2014

mathematic
p = r - c p = 150 n - 850 - 76 n p=74n-850
September 30, 2014

math exponential function
450 (1.06)^(2n) = 477 1.06^2n = 1.06 n = 1/2 year
September 30, 2014

Calculus
ln y = x ln 2 1/y dy/dx = ln 2 dy/dx = y ln 2 or dy/dx = 2^x ln 2
September 28, 2014

physics
time for first rock -20 = -5 t^2 t = 2 seconds to fall so t for second ball = 2 - 1 = 1 second -20 = -Vi t + -5 t^2 20 = -Vi + 5 Vi = -15 m/s (the - sign means speed is down)
September 28, 2014

physics
Da = Db same distance total time a = time b + delay b we want time b Car A accelerate phase: vi = aA delayb Di = .5 aA delayb^2 constant speed phase Da = Di + vi t = .5 aA delayb^2 + aA delayb timeb Car B Db = .5 aB timeb^2 now Da=Db so .5 aA delayb^2 + aA delayb timeb = .5 aB...
September 28, 2014

physic
first vertical problem 45 = 4.9 t^2 t = 3.03 seconds to fall distance ball is from building = 3.03*5 = 15.15 distance man must run = 15.15 - 6 = 9.15 time man has = 3.03-.3 = 2.73 seconds 9.15 = .5 a (2.73)^2 solve for a
September 28, 2014

trigo
cos 3 x = 4 cos^3 x - 3 cos x
September 28, 2014

SCIENCE - PLEASE HELP PLESE
4) Multiply 4.135 x 4.688 888 887 m x 8.7m round your answer to the correct number of significant figures. ============================ You only have 2 sig figs because you said 8.7 not 8.70000000 so 19.388555555 is 19 <-------answer
September 28, 2014

SCIENCE - PLEASE HELP PLESE
3) Round 3155.24m, 8.777 73 cm, and 93.775 57 kg to one less significant figure than they each have currently. ==================== 3155.24 4 is less than 5 so 3155.3 3<5 so 8.7777 93.77557 7>5 so 93.7756
September 28, 2014

SCIENCE - PLEASE HELP PLESE
2) Find the weight of a 12.25 kg dog. Round your answer to the correct number of significant figures. Use weight=massxfree-fall acceleration. g is different in different places on earth. We need it to four significant figures because your mass is to four sig figs. I will call ...
September 28, 2014

SCIENCE - PLEASE HELP PLESE
1) Round 578.683 m, 47.3333 kg, and 789.5 cm to four significant figures. 0,1,2,3,4 round down 5,6,7,8,9 round up 578.6 83 8 is greater than 4 so this becomes 578.7 meters 47.33 33 3 is less than 4 so this becomes 47.33 kilograms 789.5 cm This already has four significant ...
September 28, 2014

trigo
h = L (1-cos T) geometry exact cos 2A = 1 - 2 sin^2 A identity so cos T = 1 - 2 sin^2 (T/2) h = L [ 1 - (1 -2 sin^2 (T/2) ] = L [2 sin^2 (T/2) ] = 20 sin^2 (T/2)
September 28, 2014

physics
2.4*84
September 28, 2014

physics
84*.24
September 28, 2014

geometry
height = h = 280/40 V = (1/3)(40)(h) the volume of any pointy thing with straight sides = (1/3) base area * height
September 28, 2014

math
in the ten based number system: To multiply by ten, add a zero To divide by ten, move decimal point one space left 200 / 10 = 20.0 = 20
September 27, 2014

physcis
.926 = (1/2)(9.8) t^2 solve for t u = 18.3/t
September 27, 2014

physics
r = 33*10^6 + 6.37*10^6 2 pi r = circumference of orbit v = 2 pi r/(24 h * 3600 s/h) Ac = v^2/r
September 27, 2014

physics
1.1 = Vi t - 4.9 t^2 t = 4.4/u but u = Vi because tan 45 = 1 1.1 = u t - 4.9 t^2 1.1 = u t - 4.9 (4.4^2)/u^2 1.1 u^2 = u^2 (4.4) - 94.9 3.3 u^2 = 94.9 u = Vi = 5.36 m/s sqrt(u^2+Vi^2) = 7.58 m/s
September 27, 2014

physics
45 F = 30*(45-15)
September 27, 2014

physics
200*10^3 = .2*10^6 m high R earth = 6.38*10^6 so R = 6.58 * 10^6 meters G = 6.67384 × 10-11 m3 kg-1 s-2 earth mass = Me = 5.97*10^24 kg m v^2/R = G Me m /R^2 v^2 = G Me/R = 6.67 * 5.97 /6.58 * 10^(-11+24-6) = 6.05 * 10^7 = 60.5 * 10^6 so v = 7.78*10^3 = 7,780 m/s (PART B...
September 27, 2014

physics
a = change in velocity / change in time = -16.7 / t t = distance/ average speed = .67/8.35 = .0802 second so a = -16.7 / .0802 = -208 agree F = m a = 42 * -208 = -8736 Newtons AGREE
September 27, 2014

Math
Try the rest now.
September 27, 2014

Math
10 balls at start 1 prob black, white, red = 3/10 * 4/9 * 5/8 2 prob black, red, white = 3/10 * 5/9 * 4/8 same as above 3 prob white, black, red = 4/10 * 3/9 * 5/8 same again 4 prob white, red , black same 5 prob red , white, black same 6 prob red, black, white same so 6 * 3/...
September 27, 2014

Engineering science
fresh water is about 1 kg/Liter so m g h/t = 9000 kg * 9.81 * 70/3600 seconds = 1717 Watts done = 1717 Joules/second * 3600 seconds/hr = 6,180,300 Joules/hour = 1717Joules/second*60 s/min = 103,020 Joules/min
September 27, 2014

science
3000*1 = F = 4000 * x x = .75 m/s^2
September 27, 2014

chemistry
. 4 mol/liter = .0004 mol/mL 30 * .0004 = 0.012 mol NaOH .012 mol NaOH in 100 mL is .12 mol/liter
September 27, 2014

physics
Gravitational force = G mplanet m/d^2 G = 6.67384 × 10-11 m3 kg-1 s-2 so FB = 6.67384 × 10-11 m3 kg-1 s-2 MB*6930/(3.01*10^6)^2
September 27, 2014

physics
FB = G MB 6930/(9*10^12) FA = G MA 6930/(9*10^12) MA = (9*10^12/6930 G) FA MB = (9*10^12/6930 G) FB ---------------------------- MA - MB = (9*10^12/6930 G)(FA-FB)
September 27, 2014

chemistry
100 (4.78/6.67)
September 27, 2014

math
multiply first equation by 6 6 x + 30 y = 36 6 x - 15 y = 18 --------------- subtract 45 y = 18 y = 18/45 = 6/15 x = 6 - 5 y x = 6 - 2 x = 4
September 27, 2014

chemistry
check, yes they add to 100 well, let's say we have 100 grams of this stuff Then we have 62.04 grams of C 62.04 / 12 = 5.17 mols of C 10.41 mols of H 27.55/16 = 1.72 mols of O 10.41/5.17 = 2.01 so 2 H for every C 10.41/1.72 = 6.05 so 6 H for every O 3C 6H 1O or C3H6O which ...
September 27, 2014

Physics
2 pi radians is a revolution so 8 pi radians is four revolutions
September 27, 2014

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