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Posts by Damon

Total # Posts: 29,823

Physics 20
A is 7620 m/s B is 2.71*10^20 kg and for heaven's sake use SCI units, do not use km and hours or something. Use meters, seconds, Newtons, kilograms. 1 hour = 3600 seconds 1 km = 1000 meters

Physics 20
B) v(9.06*10^3) = 2 pi (311) v = .216 m/s I do not think so, suspect you mean 311km not 311 m that would give v = 216 m/s then 7620^2 = G Ma/r 7620^2 = 6.67*10^-11 Ma/311 Ma = 2.71*10^20 kg

Physics 20
v^2 = G Me/r v^2 = (6.67*10^-11)(5.97*10^24) /6.85*10^6 v^2 = 5.81 * 10^7 = 58.1*10^6 so v = 7.62*10^3 so v = 7620 meters/second

Physics 20
A)when in orbit about earth mv^2/r = m (G Mearth)/r^2 solve for v B) same equation but get v immediately v T = 2 pi r then m v^2/r = m Ma(G/r^2) m , mass of sat cancels we know v solve for Ma

Physics 20
I did B

Physics 20
Weight is NOT in kg but in Newtons !!!!!! F = m * 9.81 = 154*9.81 = 1510 Newtons

Physics 20
A) F = G m Me /r^2 at surface G Me/r^2 = 9.81 B) answer to A*r^2/(r+222,000)^2 but if you try to measure it with a scale, zero because F is balanced exactly by mv^2/R if in orbit which is the answer to part C. Really weight in orbit means nothing.

Physic
x = 1.6 (pi)cos(pi*1.3 +pi/3) = 5.03 cos (1.63 pi) = 5.03 * .397

Algebra
(A/2) -5 = 35 A/2 = 40 A = 80

Health
yes. Despite the act that it ends in s, it is one disease.

Physics 20 Energy
m g (change in height) 85 * 9.81 * 2.4 *1000 Joules

Physics 20
5(2.5)^2 =5*6.25

huh??
It is a four dimensional pool?

Chemistry
H2O = 18 g/mol so I have 5.5/18 mols water you get two mols H2O for every mol of O2 so I used 5.5/36 mols O2 O2 = 32 g/mol so 5.5*32/36 = 4.89 grams O2

Chemistry
Fe2O3 + Al ---> Al2O3 + Fe same number of mols of Fe as of Al Al = 30 g/mol so 225/30 mols of Al so 225/30 mols of Fe so (225/30) mol mass of Fe (225/30)56 = 420 grams of iron

Nope
Look at it on a number line. for positive x-3 x must be to the right of 3 but then sqrt x must be greater than sqrt (x-3) which is not possible. If it were -3 on the right, that would be different (x-3)^.5 - x^.5 = 3 square both sides [(x-3)^.5-x^.5][(x-3)^.5-x^.5] = 9 (x-3)-2...

Physics 20 Gravity
11.2 m/s^2 as compared to 9.81 on earth

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

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

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 !!!!

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

whoops
825/10,000 or 33/400

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

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

Algebra
120-84 = 36 (36/120)100 = 30%

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

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...

algebra
7/3 = 2 1/3 or 2.33333.......

algebra
0.164*188 = 30.8

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.

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 ...

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...

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

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

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.

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"...

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

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 ...

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

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

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...

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.

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

Algebra
slope = (9-2)/(x-2) =7/(x-2)

Algebra
LOL - three ways to get at that same parabola

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

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

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

Maths lit
32*0.794 Kg

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

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.

MATH
11 - G

math
(5/20)100 = 25%

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

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

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

Algebra
-11 x^5 +4x +8x^3 -13x -2 +7x^3 -11x^5 +15 x^3 -9x -2

Triangles math
fraction = percent /100 2*0.5 and 3*0.5 2*3 and 3*3 2*5 and 3*5

math
2/5 of 5/12 = 1/6

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

social studies
and you are right.

physics
energy = q V = 16 q so (1/2) m v^2 = 16 q

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 = ...

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

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

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

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.

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

physics
impulse = force * time = change of momentum the key word is "quick"

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)

Maths
(3km/60min)20min = 1 km

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

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

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

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

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

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.

math
about 780 http://davidmlane.com/hyperstat/z_table.html

Algebra 6
2 y + 1 x + 2 = 1 x + 2 y + 2 0 = 0 true for any x and y

Algebra 2
1<11 and 1>-3 :) yes a

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

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

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

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 ...

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

Math
54/3 = 18 w/h 18 * 6 = 108 w

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

math
n(n-2) = 24 n^2 - 2 n - 24 = 0 (n-6)(n+4) = 0 n = 6

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

maths
a21 = a1 + 20 d a10 = a1 + 9 d

science
Two H+ ions per molecule so I suppose 2 * 0.08 = 0.16

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

maths
42(3/7) = 18

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

Math
150 * .05 pounds

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

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

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

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

calculation error
t = 2.83 seconds v = 2.5 * 2.83 = 7.07 m/s

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