# Posts by Damon

Total # Posts: 30,065

Maths: Surds
a(a+b) = 100 but b = 2a/(1+sqrt5) a [ a + 2a/(1+sqrt5) ]=100 a^2 [ 1 +2/(1+sqrt5) ] = 100 etc

Maths: Surds
I do not see your picture but suspect you are talking about what is often called the "golden ratio". http://en.wikipedia.org/wiki/Golden_ratio

Chemistry
if you have 2 moles of B you need 6 moles of A In other words you do not have enough A I guess I just said 2) :)

algebra
conversion factor is (14 gal/340 mi) (14 gal/340 mi)(544 mi) = 22.4 needed for whole trip so 22.4-14 = 8.4 more needed ============================= with proportions (I do physics not math so not my thing) 14/340 = x/544 so x = (14/340)544 again

Physics
a = change in velocity/time = 105/1.2*10^-3 = (105/1.2)10^3 x = 40(1.2)10^-3 - (1/2)at^2 = 40*1.2*10^-3 -(105/2.4)10^3 (1.2)^2 10^-6

physics
u = 42 cos 36 horizontal speed so t = 27/(42 cos 36) Vi = 42 sin 36 initial speed up h = Vi t - 4.9 t^2

Physics
0.5 m^3 * 2.70 * 10^3 kg/m^3 = 1.35 *10^3 kg = 1350 kg

Calculus
I do not see how it could be otherwise. If there were a singularity at infinity resulting in an undefined limit, then how could the domain include plus and minus infinity?

math
2.2222 + 4.375 = 6.6 so p = 13.2

math
4 3/8 * w = 9 13/18 35/8 * w = 175/18 9/9 (35/8) * w = 4/4 (175/18) 315 w = 700 w = 140/63 = 2.222...

Technology HURRY
It is not B

stats

Algebra 2 help its urgent please(:
tan 62 = h/112 so h = 112 tan 62

physics
u = 24 m/s forever x = u t where t is time to fall 124 m h = (1/2)g t^2 124 = 4.9 t^2 t = 5.03 seconds so x = 24 * 5.03 = 121 meters

Chemistry
22.4 liters /mol at STP so the real question is how many mols of H2 produced wise to balance equation: Mg + 2HCl ----> MgCl2 + H2 so One mol of H2 for every mol of Mg Mg = 24.3 g/mol 4.8 g/24.3g/mol = .198 mol of Mg so .198 mol H2 .198 mol (22.4 liters/mol ) =4.42 liters H2

proportion and percentages problems
conversion factor is (£396.00/12 w) a) 1 w(£396.00/12 w) = £33 b) 9 w(£396.00/12 w) = £198 c) 25 w (£396.00/12 w) = £825

Language
You are welcome.

Language
where do you see petals? On a fl---- ?

proportion and percentages problems
You are welcome.

proportion and percentages problems
4 dozen = 4*12 = 48 letters so 1.200 kg/48 letters is our conversion factor, same top and bottom a) 1 let (1.2 kg/48 let) = .025 kg or 25 grams b) then 10 let = .25 kg = 250 grams c) 38 let(1.2kg/48 let) = .95 kg = 950 grams

Language
oh, of course :)

Language
what is the opposite to host? Maybe enemy? Evil landlord? I am not going to type the politician's name ?

MATH
distance = speed * time here 38 mi = 2mi/h * t t = 38/2 hours or 19 hours

math help plz really urgent
8 = log I1/s 6 = log I2/s 8-6 = log I1/s - log I2/s so 8 -6 = log (I1/I2) = 2 10^log(I1/I2) = I1/I2 = 10^2 = 100 so I1/I2 = 100

Algebra
14 x^2 -12 x^2 = 2 x^2 3 x + 11 x = 14 x 4 - 3 = 1 so 2 x^2 + 14 x + 1 ============================ 4 x^2 - 2 x^2 = 2 x^2 -5 x + 1 x = - 4 x +4 + 8 = 12 so what do you think ?

social studies

social studies
1. is indeed C The rest makes little sense; proofread.

physical science
C is your hard drive Hi. We can not get there from here.

Physics
call unknown vector U U = 0 i + |C| j = [bx+cx] i + [by+cy]j |C| = sqrt(7.1^2+3.1^2) so bx + cx = ux = 0 bx = -cx = -7.1 and by + 3.1 = uy = |C| so by = |C| - 3.1 B = bx i + by Jj

Us history
Well first of all what do you mean by "Annual rights"? A right is a right, it does not expire after a year even if there is an election. Now if you are looking for rights, the best place to start is not the Declaration but the first ten amendments to the Constitution...

Chemistry
you want 2 mols (half a liter of 4N) H3PO4 = 3+31+4(16) grams/mol

Chemisty
.300 * 5 = 1.5 mols HNO3 = 1 + 12 + 3(16) grams/mol

Science
fossil record?

.55 m g = 140 m = 140 /[ .55*9.81 ]

nobody knows
meaningless, area of what?

Math
9 - 8*7 + 6/3 = 9 - 56 + 2 = -45

Math
length = 4 x width = 3 x area = 12 x^2 = 4800 so x^2 = 400 x = 20 3x = 60 4x = 80

maths
area = 96 * .75*.75 = =96*9/16 =6*9 = 54 m^2 54/9 = 6

math
6(10) + 5(1) = 65

Algebra
-4 -2 +2

algebra
(-3)^2 -5(-3) + 1 = 9 + 15 + 1

math
65

Math
when you multiply by 10 in our conventional tens base number system, move the decimal point one place to the right. for example 0.27 * 10 = 2.7

physics
goes .5 Vi in the first half second for the rest of the trip the average speed is Vi/2 (because Vi at start, zero at end, and constant a) 5 = .5 Vi + (Vi/2) t = t is the time to deaccelerate from Vi to 0 v = Vi - 6 t so t = Vi/6 so 5 = .5 Vi +(Vi/2)(Vi/6) Vi^2/12 + Vi/2 - 5 = ...

phy211
first part final v = a t = 40 m/s average v = 20 m/s x = 0 + 20(20) = 400 m second part v = 40 x = 400 + 40(20) = 1200 m third part Vi = 40 average v = 20 time = 40/3 = 13.3 x = 1200+20(13.3) = 1466 m

Math, Data Management
google "permutations" p(12,2) = 12!/(12-2)! = 12!/10! = 12 * 11 = 132

draw a flowchart wich genrates frist 50 items of t
Well, not really :) But I have boxes of it in the attic.

draw a flowchart wich genrates frist 50 items of t
x(1) = 1 x(2) = 2 do 1 for n = 3 to 50 1 x(n)= x(n-1)+x(n-2) print or store the results the end

physics
v = 3 t x = 1.5 t^2

Algebra

Algebra
(4x^5 y^6 z)^2 (5x^9 y^12 z)^3 ???????????????? if so 16x^10*125x^27 * y^12 y^36 * z^5 = 2000 x^37 * y^48 * z^5 note a^b * a^c = a^(b+c) (a^b)^c = a^bc

Physics
m g h 100 * 10 * 1.5 =1500 Joules

math
** v c s n| x x x f| x x x m| x x x p| x x x v = vanilla c = choc etc n = nuts f = fudge m = marshmallow sure enough, 12 x marks :)

Maths
first a boy, take him out to the principal's office, then a girl? m + 12 students boy first m/(m+12) now we have (m-1)+12 students pick a girl 12/(m+11) so the product is 12m/[(m+12)(m+11)] or 12m/(m^2 + 23m + 132)

Physics
u = 27 cos 45 forever Vi = 27 sin 45 at start h = Vi t -4.9 t^2 = t (Vi -4.9t) h = 0 at ground so at ground at t = 0 of course and at t = 27 sin 45 /4.9 range = u t max height at t = half that t h = Vi t - 4.9 t^2 second question nonsense, from where

Physics
Since this is physics, I assume you use SCI units, meters, seconds, newtons, kilograms ... x direction 31min * 60 s/min = 1860 seconds u = x velocity = 109000meters/3600 seconds =30.3 meters/second x displacement component = 30.3*31*60 = 56,358 meters y direction 83,000/3600...

Physics
north 990 sin 45 = y component west 990 cos 45 = NEGATIVE x component south is -990 y component and zero x component

math
88*20 = 1760 in^3

huh? sin(2x) /5x maybe
well the point is that sin x ---> x -x^2/2 + ....... as x------> 0 sin x ---> x so sin(2x) / 5x ----> [2x - 4x^2 ...]/5x as x---> 0 sin(2x) /5 ---> 2x/5x = 2/5

mathematics
ax + ab = c agree so far but ax = c-ab x = (c-ab)/a or x = c/a - b

Math
subtract 2 from both sides 2x = 2 multiply both sides by 1/2 x = 1 or just think from the start what plus 2 = 4 well, 2 of course so 2 of them is 2 so one of them is one

Physics
None if there is no friction. You could ask how much force to accelerate the cart. But if you do that, do in in kilograms and Newtons and meters and seconds. Pounds are too confusing.

Physics
u = 15.5 cos 53.5= 9.22 m/s forever Vi = 15.5 sin 53.5 = 12.5 initial h = Hi + 12.5 t - 4.9 t^2 h = 0 at ground Hi = 4.9 t^2 -12.5 t Hi = 4.9(5.37)^2 - 12.5(5.37) Hi = 82.1 meters v = Vi -9.81 t v = 12.5 - 9.81(5.37) = - 40.2 m/s

American government
enforce, not force otherwise ok, but if you google articles of confederation I am sure you will find more.

Math
Left side (cos/sin)/(1/sin -1) cos /(1-sin) multiply top and bot by (1+sin) cos(1+sin)(1-sin^2) or (1+sin)/cos right side (1/sin +1) /( cos/sin) (1+sin)/cos same

Math
a + s = 90 so a = (90-s) 3 a + 2 s = 250 so 3(90-s) + 2 s = 250 etc

solar science physics
ah come on. After overwhelming Hoover dam, it starts getting those nuc plants lined up: "An ideal grid-tied inverter works as a perfect voltage source, and changes the grid voltage and frequency to match its own. "

Huh
a = F/m if the force is the same and the mass is the same, then the acceleration is the same.

Math
(sin/cos + cos-/sin-)/[sin/cos-cos-/sin-] sin -x = -sin x cos -x = cos x (sin/cos - cos/sin)/[sin/cos+cos/sin] multiply top and bottom by sin cos (sin^2 - cos^2)/(sin^2 +cos^2) but sin^2+cos^2 = 1 sin^2-cos^2 but sin^2=1-cos^2 1 - cos^2 -cos^2 1 - 2 cos^2 well, that is what is...

Physics
If the velocity versus time is straight, then its slope, the acceleration, is constant a = change in v/change in t = (29.3 - 0)/29.9 calculate a v = Vi + a t but Vi = 0 so at t = 19.9 v = 0 + a (19.9)

Maths Probability
ppo 4/11 * 3/10 * 7/9 = a pop 4/11 * 7/10 * 3/9 = b opp 7/11 * 4/10 * 3/9 = c add a+b+c for the answer to (1) =============================== first is p = 4/11 second is p = 3/10 third is o = 7/9 answer to (2) is 4/11*3/10*7/9 for ( 30), Bayes try http://en.wikipedia.org/wiki/...

Algebra
Now let me see in F, 32 to 212 = freeze to boil in C, 100 = freeze to boil so change of 180 F is change of 100 C so change of F = (180/100) change of C = 9/5 now when C = 0, F = 32 so F = 32 + (9/5) C that settled, what is 52 F 52 = 32 +(9/5) C 20 = (9/5) C C = 100/9 = 11.1 ...

Science
Nah, the zero part counts total distance/total time

Algebra
It is particularly helpful if you have a whole string of them.

Algebra
You are welcome.

doing units science way
Yes, but people in science have a particular approach, Type the units in such a manner that the ones you do not want cancel we can use 6 meters / 1 minute or we can use 1 minute / 6 meters (both are the same top and bottom, just different units. For this problem one minute IS ...

Algebra
60 mi/h (1.6 km/1 mi) = 96 km/h 4 h( 96 km / h) = 384 km

Maths
100 p + 30 g + 5 c = 1,000 p+g+c = 100 so c = 100 - p - g 100 p +30 g +5(100-p-g) = 1,000 95 p +25 g = 500 we know p+g < 100 or we have <1 c p and g must be integers, no half goats allowed well 95 times what is a multiple of 25 95 = 5*19 so 95*5 = 19*5*5 =475:) try 5 ...

Physics
Where to start? My experience is with the earlier egg drop projects but there are some ideas here: http://www.google.com/search?q=egg+car+crash+project+ideas&ie=utf-8&oe=utf-8 What you can do depends on the ground rules for your particular project, specifically what materials ...

Math
1 meter/20,000 meters is 1 meter/20 km square that for area instead of length 1 meter^2/400 km^2 so (3/400) square meter or in centimeters 1 sq meter = 10,000 sq cm so 30,000/400 = 300/4 = 75 cm^2

Huh?
Let me get this right: You want me to type an entire linear algebra course into this tiny box on my screen?

Physics
weight = m g normal force = m g cos 37 friction force up slope = .15 m g cos 37 proulsion force down slope = m g sin 37 net force = m g (sin 37 - .15cos 37) = m a so a = g(sin 37-.15 cos37) calculate a from that now v = a t = 5 a

math
(87+75+93+85+x)=88*5

They all look true to me.

slight clarification (physics)
a = -9.8 m/s^2 = g (1/2) a = -4.9 m/s^2 so distance = (1/2)g t^2 +48 t + c distance = -4.9t^2 + 48t + c, where c is the initial height

Physics
1. b right 2. AhhhgggHHH a is 1 g downward the whole time whatever is airborne 3. b right 4. sqrt(10^2+10^2) =10sqrt2 = 14 c 5. c! when you reach steep enough it goes to zero 6. B ! the forces are ALWAYS equal and opposite (Law 3) however unless the friction on the ground or ...

Chemistry
CH4 = 12+4 = 16 g/mol O2=32 g/mol CO2 = 12+32 = 44 g/mol CH4 + 2O2 ---> CO2 + 2H2O I guess we want just the CO2 gas, although that H2O is initially steam same mols of CO2 as mols of CH4 1000 grams / 16g/mol = 1000/16 mols of CH4 so 1000/16 mols of CO2= 62.5 mols quick ...

Chemistry
quick esstimate: CO = 12+16 = 28 g/mol about 22.4 liters/mol at stp so we are talking around 28*20/22.4 = 25 grams of CO +10 grams of rubber = 35 grams total will the air lift that? 1.17*20 = 23.4 grams of buoyancy no way, not close

Physics
1 d

Physics
4. It is stopped, but the acceleration is STILL -9.81 m/s^2 from the time it is launched until it hits the ground or something.

Physics
3. The acceleration of g = -9.81 m/s^2 is CONSTANT, even if the speed is zero !

Physics
2. 45 - 10*3 = 15 which is c

Physics
1. c is not correct. a particle moving at constant velocity has no acceleration. However how could a particle with constant acceleration stay stopped?

You try first
Hey, I already took 8:01, freshman physics. I am here to help if you get stuck, not to do the problems for you. These are very basic questions

Physics
acceleration and velocity are vectors. They have magnitude and direction. In your car, speedometer gives speed but you need a speedometer AND a compass for velocity acceleration is the rate of change of velocity. If you go in a circle at constant speed your velocity changes ...

No idea
sorry, do not know

physics
Hey, do some yourself. I already took the course. (in 1955)

physics
friction force = mu m g = m *(centripetal acc) so mu g = Ac = v^2/R car A .222 g = 19.5^2/R so R g = 19.5^2/.222 car B R g = v^2/.670 so v^2 = .670 [ 19.5^2/.222 ]

physics
Ac = v^2/R = omega^2 R omega in radians/second Ac = 9.81*2.28*10^3 (good grief!) omega^2 = 9.81*2.28*10^3/.0297 omega = 868 radians /second 868 rad/s (1rev/2pi rad)(60s/min) = 8287 rpm

physics
omega = v/R is the same for each Ac = omega^2 R = v^2/R 284 = omega^2 (.0302) SO Ac = [284/.0302](.0803)

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