Monday
November 24, 2014

Posts by Damon


Total # Posts: 19,427

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

Agebra
you did
August 25, 2014

Physical Science
LOL You only have two significant figures in 3.0 365.25 * 3.0 = 1095.75 which to two sig figs is 11*10^2
August 25, 2014

Physical Science
100 * .2/37 100 * .3/37
August 25, 2014

geography
because it is big and you only see a tiny bit of the surface of the sphere because you are so close to the surface like an ant on a huge round balloon. If you get far away, like in an orbiting space station, you can see the curvature.
August 25, 2014

business math
markup = 25,869.57 - 11,900 = 13,969.57 13,969.57 * 100 / 25,869.57 = 54
August 25, 2014

phychics
Moreover for the sake of us physicists, please spell physics.
August 25, 2014

phychics - typos
what is the friction on this friction track you gave the speed at the top - why do you ask for it? If it is another hill, what is the height?
August 25, 2014

Physical Science
I do not know because I do not know the true value. However I can give the percentage range from the average of the two. (37.2+36.7)/2 = 36.95 difference = +/- 0.25 100* .25/36.95 = + or - .68%
August 25, 2014

Ed Tech
I have a sneaking suspicion that they want antivirus software if they are downloading stuff.
August 25, 2014

Math
The round one with red and blue and white stripes
August 25, 2014

Calculus
p = 2L + 2 w w = 64/L so p = 2L +128/L w can range from 0 to L if w = 0, L ---->oo and p -->oo if w = L, L = w =8 and p = 4*8 = 32 so 32 </= p </= oo
August 25, 2014

Math
I suspect you mean but did not type: 5x^7/(97x+9) and not (5x^7/97x)+9 which is too easy If my guess is right and your use of order of operations and parentheses is wrong then use (bottom derivative top - top derivative bottom )/ bottom^2 [(97x+9)35x^6 - 5x^7((97)]/(97x+9)^2...
August 25, 2014

Calculus
Kadudu, see where you posted below
August 25, 2014

Calculus
sin 2x = 2 sin x cos x so 6 sin x cos x = 3 cos x right off, if cos x = 0, we have solutions. That is when x = pi/2 and x = 3 pi/2 also when sin x=1/2 that is x = pi/6 and x = 5 pi/6
August 25, 2014

Physics
I suspect you mean meters not miles but whatever s = speed horizontal: u = s cos 30 = .866 s if t = time rising, then 2t = time in air 15,000 = u *2 t = 1.732 s t so s t = 8660 vertical Vi = s sin 30 = .5 s v = Vi - 9.81 t v = 0 at t (the top) 0 = .5s - 9.81 t t = .05096 s so ...
August 25, 2014

Physics
If it takes 5 seconds to cover that distance you will have to throw it just about straight up so it will stay up five seconds ! u = constant horizontal speed = 10m/5s = 2 meters/second in 5 seconds it goes up 3 meters 3 = Vi t - 4.9 t^2 3 = Vi(5) = 4.9(25) 3 = 5 Vi - 122.5 Vi...
August 25, 2014

physics
You can not think of any at all?
August 25, 2014

Math
A 1/15 wall / day B 1/20 wall / day together 1/15 + 1/20 = 7/60 wall/day times 4 days = 28/60 = 7/15 wall
August 24, 2014

Math
been there, done that Masood + 1.2 Masood = 550 2.2 Masood = 550 masood = 250
August 24, 2014

I think Chemistry
Sorry, can not help
August 24, 2014

math
area of base = pi r^2 = 35^2 pi volume = height*base area = 50 * 35^2 pi ft^3 gallons = 50 * 35^2 * pi * 7.5
August 24, 2014

PHY SCI
Ac = v^2/R R = 500 meters v = 90 km/h * 1000 meters/km * 1 hr/3600 s
August 24, 2014

PHY SCI
Oh my, I suppose I will use feet and inches and miles and pounds and g = 32 ft/s^2 s = speed in ft/s u = horizontal speed = s cos 42 = .743 s Vi = s sin 42 = .669 s t = time rising 2 t = time in air 300 feet = 2u t = 1.49 s t v = Vi - 32 t 0 = .669 s - 32 t t = .0209 s so 300...
August 24, 2014

Math
7/15
August 24, 2014

physics
I am going to make a lot of symmetry assumptions and assume these are hockey puck with no rotational energy initial: V = vx i call ball mass = 1 kg momentum = vx i energy = .5 vx^2 Final ball 1 V1 = V1x i assuming symmetry so V1y = 0 momentum = V1x i energy = .5 Vix^2 ball 2 ...
August 24, 2014

hurestics
b+t = 74 3 t - 2 b = 87 3(74-b) -2b = 87 222 - 3 b - 2b = 87 5 b = 135 b = 27
August 24, 2014

hurestics
he had 27 available he spent 2 on 2 pencils so they were a dollar each
August 24, 2014

MATHS LAH
42 + 4 7(6) + 4(1)
August 24, 2014

Calculus
3 d/dx sin (4x) note: d/dx sin u = cos u * du/dx 3 cos (4x) * d/dx (4x) 3 cos (4x) * 4 12 cos(4x)
August 24, 2014

Phsical Science
The only real reason to stick with it in the US is the cost of conversion: http://education-portal.com/academy/lesson/english-system-of-measurement-definition-history-advantages-disadvantages.html#lesson
August 23, 2014

Algebra
yes
August 23, 2014

Algebra
yes
August 23, 2014

Algebra
I gather you mean: (2x+3)/4 or 2 x + 3 --------- 4 If so, yes
August 23, 2014

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