Thursday
May 28, 2015

Posts by Damon


Total # Posts: 21,069

Biology/medicine
Please give subject instead of Stuck, help. A math teacher can not help much.
November 14, 2014

MATH!!!
P = 2*L + 2*W (1,7) --> 2*1 + 2*7 = 2+14 = 16 (7,6) --> 2*7 + 2*6 = 14 + 12 = 26 etc if you want 12 pick an L, say 4 2*4 + 2*w = 12 4 + w = 6 w = 2 so (4,2)
November 14, 2014

physics
No, it is already at 100, the boiling point You want .020 kg * Heat of Vaporization of water in Joules/ kg so .020 kg * 2.26*10^6 J/kg
November 14, 2014

Science 8 - Check Answers
You are welcome.
November 14, 2014

Science 8 - Check Answers
4. OK, but if I had the choice I would say "mechanical" energy 5. I do not think so. You want a poor conductor for an "insulator". For a resistance you usually use a reasonable conductor but make it thin.
November 14, 2014

history essay please help!
Ok, good luck :) I think if you just want to compare populations you should say: The world population is much larger than it was a hundred years ago due to: The things you mentioned. Do not get into growth or growth rate because that is mathematics of exponential functions.
November 14, 2014

history essay please help!
The population has doubled many, many times, and even right now the world's population is still skyrocketing. ------------------------------- The essay is about growth today versus growth 100 years ago. The population has doubled many times since when? 100 years ago? 1 ...
November 14, 2014

Physics
see: http://www.gocomics.com/tarzan?ref=comics
November 14, 2014

Physics
Fcentripetal = mAc = m v^2/R = m (7.2)^2/8.2 Fgravity = m g = m (9.81) so total force on vine = m ( 9.81 + 7.2^2/8.2) = 10^3 Newtons solve for m Note: Tarzan just swam across the wild river from rock to rock with a vine around his waist and the natives are rebuilding their ...
November 14, 2014

Math
(3/(5/4)) (4/5) = 12/5 * 4/5 = 48/25 which is about 2
November 13, 2014

Math help please!!!!!!
assuming that the origin is your center of dilation, B is correct.
November 13, 2014

Algebra
agree with Steve but most importantly look how he did it. It is not necessary to multiply the whole thing out, just the terms that end up being in x^3
November 13, 2014

maths
today
November 13, 2014

calculus
F' = 10 x^-2 dx - 2 x^-6 dx F = -10x^-1 + (2/5) x^-5 + c when x = 1 , F = 0 0 = -10 + 2/5 + c c = 48/5 F = -10 /x + 2/(5x^5) +48/5
November 12, 2014

Physics
Forget the formulas, think !!!!
November 12, 2014

Physics
I will try crate 1 m = 30 kg F = 100 N 1. impulse = F t = 100 * 3 = 300 Ns yes 2. Force = change in momentum/time and initial momentum = 0 so 100 = change in momentum/3 so change in momentum = 300 kg m/s = Ns (by the way if there is a difference between change of momentum and ...
November 12, 2014

St Ans School
or sketch a number line. You will see that the middle between 75 and 45 is 15 each way. or take the average (75+45)/2
November 12, 2014

Physics
150 v = 4.5 * 10 = 45 v = .3 m/s t to get back = 100/.3 = 333 seconds we have five min which is 300 seconds things do not look good :( Better throw that camera harder.
November 12, 2014

physics
angular momentum I omega does not change. If I decreases, omega increases to keep the product constant (the spinning skater pulling her arms in problem :)
November 11, 2014

Math
distance = rate * time = r t = 17 * 4
November 11, 2014

English
He wants (singular) They WANT (plural) Police is they, not he.
November 11, 2014

chemistry
that is the opposite of cloning
November 11, 2014

chemistry
I said that MIXING male and female genes ...... hastens evolution
November 11, 2014

chemistry
I can see how it might be nice to have genetically identical subjects in a lab experiment, but not in the real world. If the prototype happened to be allergic to some chemical that became common a hundred years from now, that would be unfortunate!
November 11, 2014

chemistry
It says that cloning does not allow adaptation. We need to adapt. That is what evolution is about. There is no mixing of genes in cloning. Each generation is identical to the prototype. That is a very rigid way to propagate a species, even if the prototype is Superman :)
November 11, 2014

chemistry
The problem with cloning is that mixing characteristics of male and female in the next generation increases diversity of the gene pool and hastens evolution of species to survive a changing environment.
November 11, 2014

Is this right
as far as I know
November 11, 2014

Is this right
sin (cos - sin) + cos (sin + cos) -sin^2+cos^2 + 2 sin cos I have cos^2 You have cos
November 11, 2014

math
8*6 = 48 slices total 48/24 = 2 slices each person 2/6 = 1/3 of a pie each to check 24 people * 1/3 pies/person = 8 pies sure enough :)
November 11, 2014

Financing and Budget
Yes, C
November 11, 2014

Chemistry
hard to argue with any of those
November 11, 2014

Algebra Help URGENT Please?
380/.2 = 3800/2 = 1900
November 11, 2014

Algebra Help URGENT Please?
95 + .2 s = 475 .2 s = 380 s = 380/.2
November 11, 2014

Math
yes side , side , side
November 11, 2014

World History Answer Check
That is more complete. Of course it does not cover the average dead French citizen.
November 11, 2014

Algebra help URGENT Please?
Oh, sorry, thought there were five eaters, there are 6 25/6 = about 4
November 11, 2014

Algebra help URGENT Please?
.1*124 =12.4 so.2*124 is about 25 25/5 = $5
November 11, 2014

math
what does the comma mean in F(x, y) = y cos x − xy sin x, xy + x cos x ? are we to integrate F around the perimeter of the triangle by integrating the divergence over the area or what ? Look at earlier questions below.
November 11, 2014

Math
the three sides of triangle 1 are the same length as the tree sides of triangle 2
November 11, 2014

Math
side EF = sqrt (4+4) = sqrt (8) side FD = sqrt (1+4) = sqrt 5
November 11, 2014

Math
hey if all three sides are the same it is congruent by side,side,
November 11, 2014

Math
side AB = sqrt (16+1) = sqrt 17 side BC = sqrt (4+4) = sqrt 8 side CA = sqrt (1+4) = sqrt 5 side DE = sqrt (16+1) = sqrt 17 LOL I guess you get the SSS idea
November 11, 2014

Calculus
Look at that link. It gives you the series expansion about zero explicitly.
November 11, 2014

physics
the charge on a proton is equal in magnitude and opposite in sign to the charge on a electron. Therefore if an atom has the same number of electrons as it has protons, it is neutral. Otherwise it is called an "ion".
November 11, 2014

Physics
c) (1/2) m v^2 = answer to b d) The reason they want is that the person would have reached terminal velocity where air drag up = weight down before falling 5000 meters. The reason they forgot about is that the diver also has the constant horizontal velocity of the airplane the...
November 11, 2014

Did I get this right?
yes, correct but perhaps you better multiply out and collect like terms for example 3x^2 + x^2 = 4 x^2
November 11, 2014

physics
weight = .010*9.8 = .098 Newtons x = .05 m k = 1.96 N/m omega = sqrt (k/m) = 2 pi f so f = 2.23 T = 1/f = .45 seconds
November 11, 2014

Derivatives
for starters x^3[ 4(5x-1)^3 (5) ] + 3 x^2 (5x-1)^4
November 11, 2014

Square Roots
11^2 = 121 12^2 = 144
November 11, 2014

math
yes, that makes sense. Did she get 26 ( 50/2 + 2/2 = 25+1 = 26 or did she come up with something else entirely?
November 11, 2014

World History Answer Check (Ms. Sue)
I like your other answers.
November 11, 2014

World History Answer Check (Ms. Sue)
2. What was the effect of total war on ordinary citizens during World War I? A: Because of total war, ordinary citizens underwent rationing of goods. =================================== True in the world outside the war zone, such as in the US. However ordinary French or ...
November 11, 2014

Math
I do not know what power you are raising twelve to if you mean 2 + (12)^2 then 2 + 144 = 146
November 11, 2014

physics
I need to know how far the center of mass of a blade is from the axis. If we assume the blade is a uniform rod with cg at its center (unlikely) then the moment of inertia about its end is: I = (1/3) m L^2 so for 3 we have just I = 1 m L^2 = 159 * 3.69^2 = 2165 kg m^2
November 11, 2014

Math
200 n = 3000 2 n = 30 n = 15
November 11, 2014

Physics
u = horizontal velocity = 3.2 cos 40 forever Vi = initial up velocity component = 3.2 sin 40 v = Vi - 9.8 t h = 1.175 + Vi t - 4.9 t^2 at ground, h = 0 so 4.9 t^2 - Vi t - 1.175 = 0 solve quadratic for t, use positive solution then range = u t
November 11, 2014

Statistics
well, just using what iss given and assuming it is true probability that woman uses computer at work = .72 so probability not = 1-.72 = .28 Binomial distribution prob 5/5 yes = C(5,5) .72^5 *.28^0 = 1 * .72^5 * 1 = .72^5 = .193 (second answer) so prob that someone does not = 1...
November 11, 2014

physics
seesaw :) 1 x = 35.5(1.27*10^-10 - x) 36.5 x = 45.1 * 10^-10 x = 1.24 * 10^-10 in other words right beside the Cl atom
November 11, 2014

physics
find the well depth in meters. I doubt if it is really just 10 cm deep but if really true then 0.10 meter multiply mass in kilograms by g, about 9.8 meters/second^2 to get weight force multiply that force by the depth to get work done.
November 11, 2014

question
I believe so.
November 10, 2014

Math
d = 4 t d + t = 20 5 t = 20 t = 4 d = 16 16-4 = 12
November 10, 2014

Math help please!!!!!
24/10 = 30/x 24 x = 300 x = 12.5 I am assuming that x and 10 are along the wall and not the ground.
November 10, 2014

PHYSICS
dW = p A dr dW = p 4 pi r^2 dr integrate W = p (4/3) pi (r final^3 - r initial^3) W = p (final volume - initial volume)
November 10, 2014

Trigonometry
sin^-1 (1.2 /4.4 )
November 9, 2014

Physics
F = m a 150 lbs = 68 kg Fscale up - m g down = m a Fscale up = m g + m a = 150 pounds + 68* 10 newtons = 150 pounds + 680 Newtons 680 Newtons = 153 pounds so 150 + 153 is about 300 pounds
November 9, 2014

math
65/60 is to the right of 1 on a number line. The result is positive. +
November 9, 2014

Physics
Thanks, I just went and looked, might do that but I am pretty busy here when I am not coaching our sailing team or whatever.
November 9, 2014

Physics
I will go look though.
November 9, 2014

Physics
I am a retired professor, do this for fun.
November 9, 2014

Physics
You are welcome.
November 9, 2014

Physics
Ah, here: http://earthsky.org/earth/tides-and-the-pull-of-the-moon-and-sun ( former clammer and lobsterman here :)
November 9, 2014

Physics
maximum high and low tides occur when the earth, moon and sun are co-linear. That is at full moon and new moon. Such tides are called "spring tides" and occur about twice a month.
November 9, 2014

Physics
Yes 0 free falling weightless :)
November 9, 2014

Physics
Backup link :) http://www.jiskha.com/display.cgi?id=1282164495
November 9, 2014

Physics
Like - "weightless" :)
November 9, 2014

Physics
No !!! ZERO no force on scale - in free fall, accelerating downward at 9.81 m/s^2
November 9, 2014

Physics
Total force on person = m g = m a in free fall. No external force on person from scale
November 9, 2014

physics
ke = .5 m v^2 + .5 I w^2 I = m r^2 w = v/r so ke = .5 m v^2 + .5 m r^2 v^2/r^2 ke = m v^2 v = 2.1 * 3.8 = 8.0 m/s so ke = 5.6 *64 Joules = m g h = 5.6 g h so 64 = g h h = 64/9.8 sin 17.7 = h/distance up ramp so distance up ramp = h.sin 17.7
November 9, 2014

Physics
see this similar reply http://www.jiskha.com/display.cgi?id=1415568126
November 9, 2014

Chemistry
How do you find the amount of water that reacted 2 mol of phenylmagesium bromine?
November 9, 2014

Chemistry
If there are 25 mg of water in a typical drop of water, how many drops of water would react completely with 2 mmol of phenylmagnesium bromide? How do I set up the problem?
November 9, 2014

Physics
sum of vectors, not product Pa =3.2[ 2.3 i + 4.2 j] = 7.36 i +13.44 j Pb =2.9[ -1.8 i +2.7 j] =-5.22 i +7.83 j P = (7.36-5.22) i +(13.44+7.83) j
November 9, 2014

Physics
initially p1 = 4 i + 2 j p2 = -3i + 3 j total p = 1 i + 5 j final p must be the same final p1 = px i + py j p2 = 6 i - 3 j px + 6 = 1 px = -5 vx = -5/2 = -2.5 py -3 = 5 vy = 5/2 = 2.5 so v = -2.5 i + 2.5 j
November 9, 2014

physics
no question was asked
November 9, 2014

Physics
m g h + (1/2)m v^2 = total energy = constant h is height above hanging straight down mg(2-2 cos 30)+.5m*9 = total energy = m g (2 -cos max angle when v = 0) notice m has nothing to do with this problem, cancels = mg(2-cos45) +.5 m v^2
November 9, 2014

Physics
Ke - work done against friction = (1/2)kx^2 (1/2)mv^2 - .3 m g (.2+x) = (1/2)(800)x^2 (1/2)*2*9 -.3*2*9.8(.2+x) = 400 x^2 solve quadratic for x why are you talking about m g h ??? it fell on horizontal plane?
November 9, 2014

Math
b did both draw Venn diagram fri---both- weekend |20-b | b |29-b| 20-b + b + 29-b = 40 49 - b = 40 b = 9 11 fri , 9 both , 20 weekend
November 9, 2014

Calculus
You are welcome.
November 9, 2014

Calculus
Do you mean? y= (x^3+8)/(x+2) ???? or what you typed? If my guess is correct then (bottom dtop/dx -top d bottom/dx)/bottom^2 =[(x+2)(3x^2)-(x^3+3)(1)]/(x+2)^2 =[3x^3+6x^2-x^3-3]/(x+2)^2 = (2x^3+6x^2-3)/(x+2)^2
November 9, 2014

calc
x y = 50 2 x + y = p 100/y + y = p dp/dy = 0 for min = -100/y^2 + 1 y = 10 x = 5 p = 20 feet of fence
November 9, 2014

Algebra
if x = 6 then f(x/2) = f(3) = 4 y = 4/2 = 2 (6,2)
November 9, 2014

Algebra
if x = 3 then f(x) = 4 so y = 4 + 4 = 8
November 9, 2014

Physics, please!
I used g = -10, you do it with your g
November 8, 2014

Physics, please!
I guess he kicked it horizontally? Hi = 22 0 = Hi - (1/2)(10) t^2 4.4 = t^2 t = 2.1 seconds goes 17 meters horizontal in 2.1 seconds u = 17/2.1 = 8.1 m/s
November 8, 2014

Physics
F = mu m g work = F d = mu m g d Ke lost = (1/2) m Vo^2 Vo^2 = 2 mu g d mu = Vo^2/(2gd)
November 8, 2014

Algebra 2
4x(x-6)-x(x-2)=-24 4 x^2 - 24 x - x^2 + 2 x + 24 = 0 3 x^2 -22 x + 24 = 0 18 and 4 I bet (3x - 4)(x - 6) ??? yes x = 4/3 or 6
November 8, 2014

Algebra 2
6 x^2 - 13 x + 6 = 0 we want 6 * 2 and a 1 to get 13 or 9 and 4 (3 x - 2)( 2x - 3 ) ah, 9 and 4 x = 2/3 or 3/2
November 8, 2014

Algebra
speed up = u -c speed down = u+c d = speed * time 3 = (u-c)1.5 3 = (u+c)1 1.5 u - 1.5 c = 3 1.5 u + 1.5 c = 4.5 --------------------- add 3 u = 7.5 u = 7.5/3 3 = 7.5/3 + c c = (9-7.5)/3 = 2.5/3 = .83333333333333333333333333
November 8, 2014

S.S.
Civil Rights Act of 1964? People are still discriminating against black people, particularly in the South
November 8, 2014

Algebra 2
we know that 7*7 = 49 and 49+1 = 50 so we know what to do 7 p^2 - 50 p + 7 = 0 (7 p - 1) ( p - 7) = 0
November 8, 2014

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