Monday
September 1, 2014

Posts by damon


Total # Posts: 18,160

Physics
You are welcome.
September 1, 2014

Physics
You never converted km/hr to m/s go back and do the first step I gave you Vi = 60 km/h (1 h/3600 s)(1000 m/km) and you will get initial velocity = 60/3.6
September 1, 2014

Physics
I get -6667 N
September 1, 2014

Physics
Show me your steps.
September 1, 2014

Physics
no calculate Vi, the initial velocity, as I showed you. then use Vi in the last line to get a, which is negative because we are braking. Then F = m a = 1200 a
September 1, 2014

Physics
Vi = 60 km/h (1 h/3600 s)(1000 m/km) v = Vi + a t 0 = Vi + a t t = -Vi/a d = Vi t + (1/2) a t^2 25 = Vi (-Vi/a) + (1/2)a (-Vi/a)^2 25 = -Vi^2/a + (1/2)Vi^2/a 25 a = -(1/2)Vi^2
September 1, 2014

math
p^2 + p^2 + 10 p + 25 = 625 2 p^2 + 10 p - 600 = 0 p^2 + 5 p - 300 = 0 (p+20)(p-15)= 0
September 1, 2014

math
x by (2000/x) x + 2000/x = 90 x^2 - 90 x + 2000 = 0 (x-50)(x-40) = 0 I suspect it is longer than it is wide
September 1, 2014

Social Studies
Well, of course you will need a publisher for your book when you finish answering. Perhaps you could start with who won and who lost and why.
September 1, 2014

geography
convection maybe?
September 1, 2014

Physics
slope of vector A = -6.5/5 so slope of perpendicular = 5/6.5 or C dot A = 0 5 Cx - 6.5 Cy = 0 Cy/Cx = 5/6.5 if Cx = 6.5 k then Cy = 5 k C dot B = 6.5 k (-2.5) + 5 k (7) = 15 so -16.25 k + 35 k = 15 18.75 k = 15 k = .8 so Cx = .8 * 6.5 Cy = .8 * 5
August 30, 2014

History
By the way, Maine was part of Massachusetts and Vermont was either New Hampshire or New York depending on who you asked :)
August 29, 2014

science
1-.2 = .8 1-.6 = .4 .8 * .4 * 50
August 28, 2014

math
No matter how you turn it, you two are right and person z is wrong :)
August 28, 2014

History
Making it worse is that often the same crop is grown in the same field season after season, making it super easy for the bugs.
August 28, 2014

History
Those crops tend to be produced as mono cultures, mile after mile of fields of the same crop. That makes it easy for the insects to adapt to the crop culture and multiply fast without having to look around for the stuff they like. It is sort of like you are growing hordes of ...
August 28, 2014

Chem Help
whatever you are distilling boils at a lower temp
August 28, 2014

algebra
t s^2 = (R-3) s^2 = (R-3)/t s = plus or minus sqrt [(R-3)/t ]
August 28, 2014

algebra
multiply everything by 10 2 x - 5 x = 210 -3 x = 210 x = -210/3 x = -70
August 28, 2014

algebra
5/3 and sqrt 3 :)
August 28, 2014

Geography
Alaska only in the winter :) There are a lot of glaciers in Alaska but I would not say it is mainly covered in ice all year.
August 28, 2014

algebra 2
what about 1.573 ?
August 28, 2014

Math Problem (please help)
revenue = 4.59 n cost = 4000 + 2.19 n to break even: 4.59 n = 4000 + 2.19 n profit = revenue - cost 5500 = 4.59 n - 4000 - 2.19 n
August 28, 2014

sorry, forgot 10, you are right
10/k = 4.67 * 10^4
August 28, 2014

Physics ...
number produced per second = 10 number lost per second = r = k n so dn/dt = 10 - k n max when dn/dt = 0 or when n = 10/k now find k from half life experiment dn/dt = -k n dn/n = -k dt ln n = -k t + c n = Ni e^-kt when t = 3.24 * 10^3 n/Ni = .5 ln .5 = -k (3.24*10^3) -.693 = -k...
August 28, 2014

science
work = force * distance in direction of force 2.7 = 4.5 x
August 28, 2014

Physics
100 west and 100 east
August 28, 2014

Physics
20 * 200 zero again, but you know that :)
August 28, 2014

Physics
They look right to me. Of course she is not really moving it for the half of the trip that is down so you could make an argument that she is really only moving it up 450 cm and it is moving itself down 450 cm. It is the words "release" and "drop" that cause...
August 28, 2014

science
Force = charge * electric field or F = Q E if you do F = m a you can use the mass but you can use work done = change in Ke work done = change in Ke= force * distance so Q E d = Ke 2 meters= 3.25*10^-15/(1.602^10^-19 E)
August 28, 2014

math problem solving
I am assuming you mean 35,252 = 30,000 + 5,000 + 200 + 50 + 2
August 28, 2014

math problem solving
5000 50
August 28, 2014

Physical sciences
H2SO4 + 2NaOH ---> 2 H2O + Na2SO4
August 28, 2014

physics
Unless the person takes care to place the load over the original CG. People who carry burdens on their heads have great posture :)
August 28, 2014

Intro Physics Help
east 20 then west 30 then east 40 total run = 20 + 30 + 40 use for a total east = 20 - 30 + 40 use for b
August 28, 2014

Science in motion pHY 102
if both the 30 Newtons and the 20 Newtons act in the same direction then 30 N + 20 N = 50 N
August 28, 2014

Math
I think there are twice as many pairs of corresponding angles as interior because exterior also correspond. Yes of it is a parallelogram (including a rectangle). No is sides are all different lengths or for example a trapezoid. Right right
August 28, 2014

math
(7/4) * 5 = 35/4
August 28, 2014

Math
probability that he will not hit on a given shot = 3/4 probability that he will miss 4 times in a row = (3/4)^4 = 81/256 so probability that he will hit = 1 - 81/256 = 175/256 or about .684
August 28, 2014

Idk..
voter pour moi svp means vote for me please svp is abbreviation for: s'il vous plaît "if you please" I do not know what " puex to " means
August 28, 2014

Math
Huh? The three questions are all the same. Of course they all have the same answer. 0 = 4 x - 28 x = 28/4 x = 7
August 28, 2014

Math
y = k / x^3 .5 = k / 8 k = 4 y = 4 / x^3
August 28, 2014

Th
A = k a p side s = p/n base of triangle of one section = s = p/n 1/2 base = p/2n if n sides then area = n (a) p/2n) = a p/2
August 28, 2014

Math
Rational is a ratio of integers, a fraction. see: http://www.mathsisfun.com/definitions/rational-number.html
August 28, 2014

algebra
1. ok 2. ok 3> !!!! (6,3) NO agree (4,0) YES agree (3,-1) YES DISAGREE 3 - 4 = -1 yes (2,-4) NO DISAGREE 2 - 4 = -2 not -4
August 28, 2014

AP Calc. AB
d/dx (1/8) x^3 = (1/8) d/dx x^3 = (1/8) (3 x^2) = (3/8) x^2 when x = 4 = (3/8)(16) = 6
August 27, 2014

physics
a = F/m = - 50/20 = -2.5 v = Vi + a t 0 = 15 - 2.5 t t = 15/2.5
August 27, 2014

Maths
2875,35 - 2010,50
August 27, 2014

Algebra
I suppose that is true. Open y = 7 - 3 Closed 4 = 7 - 3
August 27, 2014

Science
A leg, by any other name, is still a leg.
August 27, 2014

physics
take 40 away from 200
August 27, 2014

algeba
Then multiply by P Q so far BP (not the oil spill company) + BQ = PQ B (P+Q) = PQ one more step and you are home
August 27, 2014

algeba
multiply everything both sides by B
August 27, 2014

Math
Sin A/a = sin B/b = sin C/c
August 27, 2014

maths
120
August 27, 2014

Physics
I can say noting about velocity because all I have is speed. For velocity direction is also required. For speed you can use a speedometer. For velocity you need both a speedometer and a compass.
August 27, 2014

algebra
21/7 + 3(36) 3 + 108 111
August 26, 2014

Algebra
LOL , eight crackers per serving * 12 servings = 96 indeed
August 26, 2014

physics
Sorry, I made that too hard. the two unknown vectors result in a vector that is equal and opposite to the first one so B + C is 136 units 35 deg south of east |B|^2 + |C|^2 = 136 ^2 Bx + Cx = 136 cos 35 By + Cy = -136 sin 35 Bx = |B| sin 69 By = |B| cos 69 Cx = -|C| sin 19 Cy...
August 26, 2014

physics
add up the north components (y axis) add up the east components (x axis) take the square root of the sum of the squares for the magnitude Tan theta = total y/total x but that theta is the math theta, counterclockwise from x axis for compass angle -- > 90 - theta
August 26, 2014

math
LOL, more MITx ?
August 26, 2014

math
distributive property (3x-2)(4x-3y) if you find that easier
August 26, 2014

math
remember (a^2 - b^2 ) = (a-b)(a+b)
August 26, 2014

math
(.2*12.5 -.02*12.5)/(.05 *.2) (.2*12.5 - .2*1.25 ) / (.05*.2) (12.5 - 1.25) / .05 1125 /5 225
August 26, 2014

Geometry
You are welcome :)
August 26, 2014

Geometry
I drew a diagram which I can not reproduce here A--------------------------------C --------------------B on top line A ---------------D ------16------C A ---------------D --------------------H A-------E --------D A ------E ---F ---D A-------E -G-F
August 26, 2014

Geometry
First find AG AD = 16 AE = 8 and EF = 4 so EG = 2 AE + EG = AG = 8 + 2 = 10 Now find AH AD = 16 AB = 64 so DB =64 - 16 = 48 half of that is 24 so AH = 16+24 = 40 GH = AH-AG = 40 - 10 = 30
August 26, 2014

Math
155.09 + 5.77
August 26, 2014

math
sketch it first angle from x axis = tan^-1 (8/6) = 53.1 deg so first clockwise 60 degrees so -6.87 degrees (in quadrant 4) tan -6.67 = -.12 so if x = 1, y = -.12 now we want that to be a unit vector so find magnitude of what we have r = sqrt(x^2 + y^2) = sqrt 1.014 = 1.007 so...
August 26, 2014

Calculus
Hi = 500 Vi = +14 v = Vi - 9.8 t v = 14 - 9.8 t at top, v = 0 so at top t = 14/9.8 h = Hi + Vi t - (9.8/2) t^2 so for example max height is h = 500+14 (14/9.8)-(9.8/2)(14^2)/9.8^2 or h = 500 + (1/2)(14^2)/9.8 at top
August 26, 2014

physics
it is precise it is NOT accurate 455 is NOT 500
August 26, 2014

physics
precise but not very accurate (i think its this one) yes, values close together but wrong
August 26, 2014

physics
We can not see your list. I would say wrong :)
August 26, 2014

Physics
v = Vinitial + a t if a is constant so of course no acceleration = change in velocity /change in time
August 26, 2014

compound interest
200 *1.2^3 + 200*1.2^2 + 200*1.2
August 26, 2014

Science
well, I would pick a) if length were spelled correctly. Farenheit is not SI weight is force, gram is mass meniscus is shape of the surface in a barometer or thermometer
August 26, 2014

math
I can not write TODAY because it was Yesterday :(
August 26, 2014

Physics
That depends what direction you define as positive. If + is direction from your house out, then a is positive leaving and negative as you decelerate (brake) to land at your destination. However as you start home, if you do not redefine the positive direction, your increase in ...
August 26, 2014

Physics
You are welcome.
August 26, 2014

Physics
The acceleration remains constant one g down as the speed up drops to zero at the top of the flight and then it starts downward hitting the ground at the same speed down it started up but the opposite direction.
August 26, 2014

physics
F = m a = 18 * 3 N
August 26, 2014

Physics MITx? ME course 2 ?
Looks like a course 2 MITx problem to me. You are on your own.
August 26, 2014

Math
You just did.
August 26, 2014

geometry
Draw a good sketch and make the incident and reflected rays at the same angle to the perpendicular to the mirror at the bottom.
August 26, 2014

chemistry
C6H6 --> 6*12 + 6 = 78 grams/mol so we have 1/78 mol 1/78 mol in 0.1 liter --> 10/78 molarity etc
August 26, 2014

Physics - figure with angles?
If you tried to copy and paste it, that does not work here.
August 25, 2014

Math
green on first try = 1/4 green on second try: red first = 3/4 then green = 1/3 so 3/4 * 1/3 = 1/4 green on third try red first = 3/4 red second = 2/3 green third = 1/2 3/4 * 2/3 * 1/2 = 1/4 green o fourth try red first = 3/4 red second = 2/3 red third = 1/2 green fourth = 1/1 ...
August 25, 2014

Calculus-Math
well, we know we keep the 4 :) Let z = 4(sec u)^7 and u = pi t - 6 then dz/du = 4 * 7 (sec u)^6 d sec u/du = 28 (sec u)^6 (sec u )(tan u) = 28 sec^7 u tan u dz/dt = dz/du * du/dt = dz/du * pi so dz/dt = 28 pi sec^7(pi t-6)tan(pi t-6)
August 25, 2014

French
Pourriez-vous traduire ces expressions pour moi ?
August 25, 2014

9th Grade Bio
In "respiration" by the way you are basically oxidizing organic molecules using O2 from the air, sort of like burning wood to produce energy and CO2 but at much lower temperature :) At least that is the way a physicist as opposed to a biologist sees it.
August 25, 2014

9th Grade Bio
You are welcome.
August 25, 2014

9th Grade Bio
https://www.google.com/search?q=respiration+definition&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a&channel=sb
August 25, 2014

Math
y = (4/3) x - 6 3 x = 7 - (4/3)x + 6 9 x = 21 - 4 x + 18 13 x = 39 x = 3 then y = (4/3)(3) - 6 y = -2
August 25, 2014

Algebra
No, when you list ordered pair as (a,b) a is independent variable x and b is dependent variable y
August 25, 2014

Algebra
try using 0 for x and 3 for y 3 = 0 + 3 sure enough
August 25, 2014

math
10^3 * 10^3 = 10^6 = one million
August 25, 2014

Algebra
2 x^2 = 108 x^2 = 54 note: 54 = 6 * 9 = 6 * 3^2 so x = 3 sqrt 6 or x = -3 sqrt 6
August 25, 2014

chem
the gas is still about 80% N2 so 8 atm It would also be 2 atm O2 instead of 0.20 atm O2 or ten times the O2 pressure. Both the high partial pressure of N2 and of O2 cause problems for divers and for deep diving for extended times mixtures with lower O2 content and Helium ...
August 25, 2014

algebra
draw a number line put a dot at +7 go left negative one when you go left negative, you go right
August 25, 2014

math
four choices for the first three for the second two for the third one for the fourth 4*3*2*1 = 24 usually this is called permutations and is written as n! where n! = n * (n-1) * (n-2) ....*1
August 25, 2014

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