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March 23, 2017

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Posts by Damon

Total # Posts: 29,614

Physics 20 Gravity
g = F/m = G M/r^2 where G = 6.67*10^-11 M = 7.66*10^24 r = 6.74*10^6
January 21, 2017

English
maybe something like: Increased government subsidies would make US manufacturers more competitive with heavily subsidized foreign industries.
January 21, 2017

Algebra
height/shadow = 3.4/1.73 = h/48.25 so h = (3.4/1.73)48.25 which is 3.4 * 48.25/1.73 or 94.8 Draw a picture !!!!
January 21, 2017

maths help plz sir damon steve or reiny
This might help: http://tutorial.math.lamar.edu/Classes/DE/HOVariationOfParam.aspx
January 21, 2017

whoops
825/10,000 or 33/400
January 21, 2017

Algebra
8.25/100 = 825/1000 divide top and bottom by 25 to get = 33/40
January 21, 2017

Algebra
.06*$70 = $4.20 it is supposed to be in dollars accurate to the penny
January 21, 2017

Algebra
120-84 = 36 (36/120)100 = 30%
January 21, 2017

Math
[ (7/3) +2 ] /[-3 -(3/2)] (13/3) / (-9/2) = -26/27 I get B
January 21, 2017

chemistry
I suppose w is weight? I suspect you mean mass in grams water is about 1 gram/cm^3 or 1 kilogram/liter so our NaCl here is .075*1 = .075 kg per liter or 75 grams/liter so the real question is How many mols is 75 grams of NaCl NaCl = 58.5 grams/mol (23+35.5) so 75 g (1mol/58.5g...
January 21, 2017

algebra
7/3 = 2 1/3 or 2.33333.......
January 21, 2017

algebra
0.164*188 = 30.8
January 21, 2017

Physics
h = 20 + .4 t - 4.9 t^2 solve for t when h = 0 just like the problem you posted below this one. also the speed when it hits the ground is the same method.
January 21, 2017

Physics
h = 1.5 + 2.5 t -4.9 t^2 when is h = 0? solve quadratic for t 4.9 t^2 -2.5 t - 1.5 = 0 you could use http://www.math.com/students/calculators/source/quadratic.htm Note, quadratics have two solutions of course. In this problem if you get a neagative time, that is how long ago ...
January 21, 2017

Physics
d = 13.9 * .6 + (13.9/2)t because average speed during deacceleration = half the original speed time to stop during acceleration is t: v = Vi + a t in general so 0 = 13.9 - 3 t t = 13.9/3 so in the end d=13.9*.6 + (13.9/2)(13.9/3) part b will you go 35+9.5 meters in time? what...
January 21, 2017

Physics
a)assume you mean Vx=1.4t^2+1.1t v = 1.4(16) + 1.1(4) b) change in velocity = answer to part a since velocity at t = 0 was 0 so divide a the answer to part a by 4 seconds
January 21, 2017

Oh, use Reiny reply
I did not see the reversal of direction
January 21, 2017

Physics (typo?)
30 min = .5 h 10 min = 1/6 h 20 min = 1/3 h ================= d = 140*.5 + 90/6 + 90/3 (it went 90 for a total of 1/2hour???? typo I bet) average speed = d /total time the way you wrote it the total time is one hour, but I doubt it.
January 21, 2017

science doppler to and fro
what frequency does the blood hear? for observer toward source: f' = f (v+Vobserver)/v f' =6.113*10^6(1570+.3979)/1570 calculate f' the blood particle serves as a transponder sending back a signal at that f' now the source is moving toward the observer f"...
January 21, 2017

Physics
for speed divide the distance by the time for velocity divide the DISPLACEMENT by the time displacement is a vector with x y and perhaps z components. All the way around a track is a Distance of 2 pi r BUT a displacement of ZERO
January 21, 2017

science chemistry
Particles maintain their distance and orientation to other particles in the solid state and only vibrate a little in place so the shape and volume of a lead block does not change (much:). In the liquid state, the particles maintain their distance but not orientation so the ...
January 21, 2017

Physics 11 question pls urgent HELP!!!!!
No The CHANGE in speed is acceleration times time 12.5 * 3.25 That is all you need The initial speed is not relevant. momentum change = mass*change in velocity = 1205*12.5*3.25 kg m/s
January 21, 2017

math
the whole thing is 14 m by 8 m so the walkway area is 14*8 - 12*6
January 20, 2017

physics
here.... +small ...... -big x ......... 0.......... 4.35 just using distances without regard to sign to get equal field magnitudes 1.90/x^2 = 3.61/(x+4.35)^2 solve for x, note it has to be - (left of origin) 3.61 x^2 = 1.9(x^2 +8.7 x+18.9) 3.61x^2 = 1.9x^2 + 16.5x + 35.9 1.71x...
January 20, 2017

Science
The birds reproduce in six months? The birds did not use the O2 in the water directly. Even cormorants breathe air above the water :) However the fish did. I think there might possibly be more fish in 6 months but doubt if the birds would react that quickly.
January 19, 2017

oic
oh, did not notice the "undefined" line is x = 2 vertical line
January 19, 2017

Algebra
slope = (9-2)/(x-2) =7/(x-2)
January 19, 2017

Algebra
LOL - three ways to get at that same parabola
January 19, 2017

Algebra
that is a parabola, where is the vertex? 16 t^2 - 96 t = -h +256 t^2 - 6 t = (1/16)(-h + 256) t^2 - 6 t + (6/2)^2 = (1/16)(-h + 256) + 9 (t-3)^2 = (1/16)(-h + 256) +(1/16)(144) (t-3)^2 = -(1/16)(h-400) vertex at 3 seconds and h =400 ft
January 19, 2017

math please help
so 12.5/100 = 125/1000 = (5*25)/(40*25) =5/40 =1/8
January 19, 2017

Further mathematics
say 15 N along x axis and 10 N 60 deg above -x axis x force = 15 - 10 cos 60 = 10 y force = 10 sin 60 = 8.66 magnitude = sqrt(100+8.66^2) tan angle above +x axis = .866
January 19, 2017

Maths lit
32*0.794 Kg
January 19, 2017

Math
r = 0.045 Ai = 500 dA/dt = Ar dA/A = r dt ln A = r t A = Ai e^rt 2500 = 500 e^.045 t 5 = e^.045 t ln 5 = .045 t so t = ln 5/.045 =1.61/.045 = 35.8 years
January 19, 2017

US History
I am no expert but in this period of westward expansion of cattle range after the Civil War I think both c and d are appropriate answers.
January 19, 2017

MATH
11 - G
January 18, 2017

math
(5/20)100 = 25%
January 18, 2017

sorry, yes
8C4 = 8!/[4!(4!)] = 8*7*6*5/(4*3*2) = 70 so 15*70 = 1050
January 18, 2017

MATH HELP
2 out of 6 administrators 4 out of 6 others combinations of 6 taken 2 at a time = 6!/[ 2!(4!)] =6*5/2 = 15 combinations of administrators combinations of 6 taken 4 at a time = 6!/[ 4!(2!)] = 6*5/2 = 15 combinations of faculty and students so 15*15 = 225
January 18, 2017

Partial Sums and finding a certain term
S3-S2 = term 3 S3 = 13/17 S2 = 8/12 maybe 13/17 - 8/12 ??? about .098
January 18, 2017

Algebra
-11 x^5 +4x +8x^3 -13x -2 +7x^3 -11x^5 +15 x^3 -9x -2
January 18, 2017

Triangles math
fraction = percent /100 2*0.5 and 3*0.5 2*3 and 3*3 2*5 and 3*5
January 18, 2017

math
2/5 of 5/12 = 1/6
January 17, 2017

math
2/3 left after pie 3/8 of that left 2/3 * 3/8 = 1/4 really the same as your problem above
January 17, 2017

social studies
and you are right.
January 17, 2017

physics
energy = q V = 16 q so (1/2) m v^2 = 16 q
January 17, 2017

physics
g sin theta = constant = your gravitational acceleration for this problem, all it ourg m a = -kx + m ourg = m d^2x/dt^2 x = Xi + xh sin 2 pi t/T Xi is our equilibrium x when a = 0 Xi = m ourg/k now if harmonic then xh is our harmonic motion x do it separate as added to Xi x = ...
January 17, 2017

Trigonometry
sqrt(49+9) = sqrt(58) =7.61 tan angle above -x axis = 3/7 A = .405 radians *180/pi = 23.2 deg so angle counterclockwise from x axis = 180-23.2
January 17, 2017

LOL - hardly
If I knew this was for a test I would not be doing it.
January 17, 2017

Math (help if you know the full test)
5/16 = .3125 which is 31.25 %
January 17, 2017

science(physics)
Try a turn, look at Ac = v^2/R needs side force from road at bottom moment about CG is balanced by light force up on inner tires and heavy force up on outer tires. The higher the CG, the longer that moment arm. When v^2/r is high enough, inner tires lift off road.
January 17, 2017

math
Na = .05*10 + .02*5 = .6 percent NaCl = .6/15 *100 = 4% =.04 .04/15ml = 40/15 grams/liter so what is 40 grams of NaCl in mols? 40g/58.44 g/mol = .684 M
January 17, 2017

physics
impulse = force * time = change of momentum the key word is "quick"
January 17, 2017

maths
w = 2h+3 total w = w+5 total h = h+5 A = (w+5)(h+5) = w h + 5w + 5h + 25 = (2h+3)h + 5(2h+3) + 5h +25 = 2h^2 +3h +10h +15 +5h + 25 = 2h^2 + 18h + 40 = 2(h^2 + 9 h + 20) =2(h+4)(h+5)
January 17, 2017

Maths
(3km/60min)20min = 1 km
January 17, 2017

Algebra 2
combinations of 18 taken 10 at a time = 18!/[ 10!(18-10)!] = 18*17*16*15*14*13*12*11/ (8*7*6*5*4*3*2) = 17*16*15*14*13*12*11/(8*7*5*4*2) = 17*15*14*13*12*11/(7*5*4) = 17*3*2*13*3*11 = 43,758
January 17, 2017

Algebra 2
combinations of 6 taken four at a time same method as your other problem 6*5/2 = 15
January 17, 2017

Algebra 2
well, around four times :) d = k v^2 49 = k (900) k = 49/900 d = (49/900)(65)^2 = 230 feet
January 17, 2017

Maths
h/5 = 20/(25+5) h = 100/30 = 10/3 = 3.33 ft
January 17, 2017

Physics
average speed = (8+0)/2 = 4 m/s so t = .30 meters/4 meters/s =.3/4 s Force * time = change of momentum or impulse F(.3/4) = .5 * 8 F = (5/3)(32) = 53.3 Newtons
January 17, 2017

history
One factor: Rotten governments in the Byzantine Empire, Persia, Mesopotamia, the Levant, Egypt, North Africa, Spain and much of Asia. Serious resistance resulted when they ran into the Franks in France.
January 16, 2017

math
about 780 http://davidmlane.com/hyperstat/z_table.html
January 16, 2017

Algebra 6
2 y + 1 x + 2 = 1 x + 2 y + 2 0 = 0 true for any x and y
January 16, 2017

Algebra 2
1<11 and 1>-3 :) yes a
January 16, 2017

math
10.8/3 = 3.6 (10.8-5.4)/1 = 5.4 (24.6-10.8)/2 = 6.9 (17.4-10.8)/1 = 6.6 (17.4-5.4)/2 = 6
January 16, 2017

geo
Area = 30m^2=30*10^4 cm^2 30*10^4 * 4 =120*10^4 cm^3/week there are 1000 cm^3/liter so 120*10^1 = 1200 liters
January 16, 2017

maths/physics help
Inew = .4*I Inew * omega new = I omega omega new = (I/.4I) * 1 rev/s omega new = 1/.4 = 2.5 rev/s
January 16, 2017

American History
The American colonies developed during turbulent times in England. The settlers in Virginia were for the most part "cavaliers", followers of the royal family. Other colonies such as in New England and the mid Atlantic were of Cromwellian mindset. The British ...
January 15, 2017

value
at time 0 30,000 at time 1 1.045*30,000+8,000 = 39,350 at time 2 1.045*39350 +8,000 = 49,120.75
January 15, 2017

Math
54/3 = 18 w/h 18 * 6 = 108 w
January 15, 2017

statistics
k(1+2+3+4+5) = 1 k = 1/15 p(3) = 3/15 p(4) = 4/15 p(5) = 5/15 so p (x>/=3) = 12/15 = 4/5 etc
January 15, 2017

math
n(n-2) = 24 n^2 - 2 n - 24 = 0 (n-6)(n+4) = 0 n = 6
January 15, 2017

science
I guess it is 4 m high?? if so the water is 2 m deep the pressure is one atmosphere plus 1000 kg/m^3 * 9.81 m/s^2 * 2 m newtons per m^2 or Pascals
January 15, 2017

maths
a21 = a1 + 20 d a10 = a1 + 9 d
January 15, 2017

science
Two H+ ions per molecule so I suppose 2 * 0.08 = 0.16
January 15, 2017

Physics
.075 v = (.075+2.000)1.5 so v = 3/.075 = 40 m/s approximately
January 15, 2017

maths
42(3/7) = 18
January 15, 2017

math
29 students do something 16-x do G only 18-x do H only x do both 16-x + 18-x + x = 29 34 -x = 29 x = 5
January 15, 2017

Math
150 * .05 pounds
January 15, 2017

Physisc
a = F/m = 120/12 = 10 m/s^2 v = Vi + a t v = 4 + 10 t by the way for distance x = Xi + Vi t + (1/2)a t^2 = 0 + 4 t + 5 t^2
January 14, 2017

Science, pls help Ms. Sue!!!!!!!
The word "electrolysis" gives it away John1.
January 14, 2017

water--> Hydrogen and Oxygen
2H2O ---> O2 + 2H2 That is a chemical reaction
January 14, 2017

Intro to stats
It is uniform? Then between 2 and 18 is 16/23 = .69565
January 14, 2017

calculation error
t = 2.83 seconds v = 2.5 * 2.83 = 7.07 m/s
January 14, 2017

Physics
Oh, I see, the force is forever a = F/m = 5/2 = 2.5 m/s^2 10 = (1/2) a t^2 20 = 2.5 t^2 t = 6.93 seconds V = a t = 2.5 *6.93 = 17.3 m/s
January 14, 2017

for how long?
How long was the force in contact with the ball? Force * time = change in momentum = m v
January 14, 2017

Math
.015 mols/liter * .01 liter = .15 mols = .00015*332 = .0498 agree
January 14, 2017

Maths
http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html a3 = a1 + 2 d = 90 a11 = a1 + 10 d = 50 -----------------------subtract a3-a11 = 0 -8 d = 40 so d = -5
January 14, 2017

physic
up for time t then down for time t (parabola) u = 100 cos 45 forever Vi = 100 sin 45 at start v = Vi - g t at top v = 0 so at top t = Vi/g = 100 sin 45 / 9.81 in the air for time = 2 t so range = 2 t u = 2 t (100 cos 45)
January 14, 2017

Calc
f = ln g df/dx = df/dg * dg/dx we were given dg/dx what is df/dg ? df/dg = d ln g / dg = 1/g so df/dx = (1/g)tan 2/(1+x^2) I think you mean = (1/5)tan 2/2 = (1/4) tan one radian or 180/pi deg = (1/5)(1.055741 ) = .31148 so agree
January 14, 2017

physics
do horizontal and vertical separately I assume j is up v = 13 - 9.81 t y = 0 + 13 t -4.9 t^2 If y is negative, it dug a hole :) and x = 12 t so d = 12 t i + (13t-4.9t^2) j
January 13, 2017

math
we have 9 * 300 = 2700 bee months of honey we now have 450 bees 2700 bee months / 450 bees = 6 months
January 13, 2017

physics
The trick here is guessing the drag coefficient of the raindrop shape. See: http://home2.fvcc.edu/~dhicketh/DiffEqns/Spring11projects/Ben_Lynch_Gavin_Lommatsch/DiffEqProject/DiffEqProjectGavinBen.pdf It is a function of Reynolds number even if the shape is spherical. However ...
January 13, 2017

mathematics
original, then difference, then difference of difference 2 ...... 3 5 ........... 2 .......5 10 .......... 2 .......7 17 ...........2 .......9 26 constant difference of differences is parabola well, y = x^2 + 1 works an = n^2+1
January 13, 2017

What?
Check for typos please. If you mean merged, same total volume, then with the same height, the base areas add up to the original. pi R^2 = pi r1^2 + pi r2^2 R2 = sqrt( r1^2 + r2^2)
January 13, 2017

maths
of course the area of ABC = (1/2)(3*4) = 6 :) also (1/2)(AD)(5) = 6 AD = 12/5 = 2.4 cm
January 13, 2017

The cay is the book
C is the only choice that indicates determination.
January 13, 2017

Physics
how long does it take to get from 100 to 30? v = vi + a t 30 = 100 - 4 t 4 t = 70 t = 17.5 s how far did we go? average speed = 130/2 = 65 65*17.5 = 1137.5 ft how far did the freight go? 30 * 17.5 = 525 525 + 600 = 1125 ft CRASH for part b x1 = 100 t - 2 t^2 x2 = 600 + 30 t ...
January 13, 2017

math
No, slant height is hypotenuse of triangle where altitude is one leg and half the base is the other.
January 12, 2017

Computing
n = 1 10 output = n*n print output n = n+1 if n = 6 quit otherwise go back up to 10
January 12, 2017

maths
3.14159.... is between 3 and 4
January 12, 2017

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