Sunday
September 21, 2014

Posts by Damon


Total # Posts: 18,583

PHYSICS
F = m a 100,000 = m of ten * 2 m of ten = 50,000 kg so m of one = 5,000 kg F = m a = 5,000 * 2 = 10,000 Newtons
July 7, 2014

Calculus
Yes. The integral of the acceleration vector is the velocity vector. The constant of integration is determined by a known velocity, often the initial velocity. The integral of velocity is displacement. Constant of integration is determined by initial position (zero here) to ...
July 6, 2014

algebra
anything at all to the zero power is one.
July 6, 2014

calc
I assume both are in x, y and not three D or you would have shown 0 in y for the first and 0 in z for the second first vector: x = -82.2 + 0.2 s y = +43.0 + 1.7 s second vector: x = -84.4 + 2.4 t y = +45.5 - 0.9 t do they hit? -82.2 + .2 s = -84.4 + 2.4 t or 2.4 t - .2 s = 2.2...
July 6, 2014

Math
term 1 = a = 28 term 2 = a r term 3 = a r^2 term 8 = a r^7 = -7/32 28 r^7 = -7/32 r^7 = -1/(4*32) r^7 = -1/2^7 r = -1/2
July 6, 2014

PHYSICS
You did not ask any question.
July 6, 2014

PHYSICS
dx/dt = 28.2/9.4 = 3 cm/s for the whole trip dx/dt = (11-2.9)/(3.3-.6) = 3 cm/s for part of the trip so I suspect constant velocity of 3 cm/s or 0.03 m/s
July 6, 2014

PHYSICS
see below
July 6, 2014

PHYSICS
Hey, do it the same way.
July 6, 2014

PHYSICS
east components (x direction): -50 -25 sin 30 = -50 -12.5 = -62.5 north components (y direction) -30 - 25 cos 30 = -30 - 21.7 = -51.7 d = sqrt (62.5^2 + 51.7^2) tan angle west of south = 62.5/51.7
July 6, 2014

Physics
use law of cosines a = 95 b = 150 c = 190 c^2 = a^2 + b^2 - 2 a b cos C 36100 = 9025 + 22500 - 28500 cos C 28500 cos C = -4575 cos C = -.16053 C = 99.2 degrees now use law of sine to find the next one
July 6, 2014

Math
x = 1 and y = 10 -->1-.1 = .9 try others x = 2 and y =9 --> 1/2 - 1/9 see?
July 5, 2014

SCIENCE
70 = m v^2/r 70 = 70 (35)^2 /r r = 35^2 = 1225 http://www.jiskha.com/m
July 5, 2014

Algebra
do you mean (8n+8) ?????
July 5, 2014

Algebra
y - -1 (x^2 - 8 x + 16) + 2 y = -x^2 + 8 x - 16 + 2 y = -x^2 + 8 x - 14
July 5, 2014

uos
You problem does not make sense to me. If it slides down a vertical distance of .4 meters then we can calculate the kinetic energy (1/2) m v^2 = m g h (1/2)(2)v^2 = 20 (.4) = 8 Joules, not 60 joules. Moreover you asked for nothing, just stated impossible facts.
July 5, 2014

Mathematics
(2 pi r)(35/60)
July 5, 2014

vocabulary
You are welcome.
July 5, 2014

vocabulary
Yes
July 5, 2014

vocabulary
Do you not associate imagery with mental pictures?
July 5, 2014

vocabulary
No.
July 5, 2014

PHYSICS
Well, force is rate of change of momentum or m A if the mass is constant, so what is the change of momentum? original momentum of driver = 52 *14 = 588 kg m/s final momentum of driver = 0 so change = -588 kg m/s How long did it take? average speed during crash = 14/2 = 7 m/s ...
July 5, 2014

compound interest
.06/12 = .005 = interest rate/month so multiply by 1.005 every month for 12 months 3500 * 1.005^12 = 3715.87
July 5, 2014

physics
Exactly, you figured it out. The man would have to pull farther (more parts in the tackle), like maybe eight times as far at 1/5 the weight
July 5, 2014

Soil Chemistry
http://www.amnh.org/exhibitions/permanent-exhibitions/rose-center-for-earth-and-space/david-s.-and-ruth-l.-gottesman-hall-of-planet-earth/what-causes-climate-and-climate-change/the-atmosphere/greenhouse-gases-a-troposphere-story
July 5, 2014

Soil Chemistry
most outgoing infrared is absorbed in the troposphere before reaching the stratosphere.
July 5, 2014

Math
10 (180-alpha) = 360 all the way around the outside 180 - alpha = 36 alpha = 144
July 4, 2014

Calculus
r = (5/8) x V = (1/3) pi [ (5/8) x ]^2 x V = (1/3) pi (25/64) x^3 etc
July 4, 2014

Algebra
sketch a graph !!!!
July 3, 2014

physics
I did #1 #2 potential energy lost = m g h potential energy gained = (1/2) k x^2 for 40 kg 40 * 9.81 * (1+x) = (1/2)(12,000) x^2 solve quadratic for x #3 I have no idea because you did not tell me ratio of bounces
July 3, 2014

ACCOUNTING
is the sum of your liabilities and ownership equity not your assets? so equity = assets - liabilities
July 3, 2014

chemistry
P V = n R T T = 16 + 273 V = 10 L = .01 m^3 n of O2 = 51.4/32 n of He = 32.5/4 calculate P of each then add to get total
July 3, 2014

Urgent Calculus Help
slope is always positive the slope keeps increasing so second derivative is positive
July 3, 2014

Urgent Calculus Help
Sketch a graph of this function. Then the answers will be obvious.
July 3, 2014

Algebra
x + (x-6) = 50 2 x - 6 = 50 2 x = 56 x = 28
July 3, 2014

Physics
m g h is the same small m needs big h Sumo seems to be 20 times as massive as the ball :
July 3, 2014

Physics -- check answers please
1. ok m g h = 20 * 10 * 2 Joules 2. No. That 400 Joules of potential energy becomes 400 Joules of kinetic energy during the fall. 3. Yes - At maximum stretch the ball stops. The ball is now 2 meters plus x below the starting point where x is the stretch distance down. The ...
July 3, 2014

Social Studies
NY heeft geen Nederlanders? Ik geloof het niet :)
July 3, 2014

American national government
separate educational facilities were inherently unequal
July 3, 2014

Physics
no constant the force increases as the spring stretches F = k x work = k x^2/2 ======================== momentum increases an external force, mg
July 3, 2014

Science
rot fungus http://en.wikipedia.org/wiki/Wood-decay_fungus
July 3, 2014

Calculus 1
A = 4 pi r^2 r = D/2 so A = 4 pi D^2/4 = pi D^2 dA/dD = 2 pi D dA/dt = 2 pi dD/dt 1 = 2 pi dD/dt dD/dt = 1/(2pi)
July 3, 2014

arithmetic
Never buy fish from a farm. Farmed fish is yuucky. Good fish comes from the ocean. lets start with 40 fish the first week 5 die so we have 35 which is 7/8 of original after first week 7/8 or 35 remain then in weeks two and three 3/5* 35 = 21 die so we are left with 35 -21 = 14...
July 3, 2014

Physics (A man in the lift)
mg down F up mg - F = m a = m g/k mg - jmg = (mg/a)(b+cj) 1-j = (b+cj)/a = 1/k k (1-j) = 1 I do not know what gcd(|a|,|b|,|c|)=1 means so can go no further.
July 3, 2014

us hist
I was a student in the Netherlands during the Gary Powers U2 incident. Our prestige and President Eisenhower's credibility were terribly damaged even in the Netherlands where the US and Canada were highly respected as the people who came and drove the Germans out.
July 3, 2014

algebra
6 x^3 - 3 x + 14 x^2 - 7 = 0 3 x (2 x^2 - 1) + 7 (2 x^2-1) = 0 (3x+7)( 2x^2-1) = 0 does that help?
July 2, 2014

Physics
work in = 44* 13 = 572 Joules which is the increase in kinetic energy
July 2, 2014

Physics
(a) 208 * 1.91 Joules (b) -154 * 1.91 Joules either add answers to a and b or do (208-154)(1.91)
July 2, 2014

mathematics
Well, I suppose that is every prime number less than 50 :)
July 1, 2014

Calculus I
Maybe try this: http://www.youtube.com/watch?v=8CuBoOaiBfA
June 30, 2014

Literature-Help me Ms. Sue
Yes I agree because then they find out too late
June 29, 2014

Literature-Help me Ms. Sue
World, warm, wings yes
June 29, 2014

MAT221
5 y = 8 x + 4 y = (8/5) x + 4/5 so slope is 8/5 so slope of perpendicular is -5/8 form is y = - 5x/8 + b goes through (-4,-4) -4 = -5 (-4)/8 + b b = -4 - 20/8 b = -4 - 5/2 b = -8/2-5/2 = -13/2 so y = - 5 x/8 -13/2 or 8y = -5 x - 52 Now parallel line slope = 8/5 y = 8 x/5 + b -...
June 29, 2014

Physics
Guess mass of person, say 80 kg guess how many on elevator, say 50 (guess high, we want a strong enough motor) so total mass of people on elevator at one time = 80*50 = 4,000 kg energy change = m g h = 4,000 * 9.8 * 8 = 316,600 Joules divide by 20 seconds ----> 15,688 Watts...
June 29, 2014

Literature-Help me Ms. Sue
Did you see: " .... I am the grass; I cover all. ..." ?
June 29, 2014

Algebra (Identity Function)
An identity function returns its argument as its value. x(4) = 4 and y(99) = 99
June 28, 2014

math
average winning = ( 5+3+2 )/6 = 10/6 net = 10/6 - 2 = -0.33 The house wins, in the end :)
June 28, 2014

Algebra
quadratic is a parabola with one vertex exponential curves one way like y = e^x curves up sqrt slope becomes smaller and smaller
June 28, 2014

Algebra
If the difference in x values is constant and the difference in y values is constant then the slope is constant and we have a straight line.
June 28, 2014

Chemistry
1 dm^3 = 1000 cm^3 = 1 liter so X2CO3 is 15.2 g/liter a liter of this requires 27.5/25 or 1.1 liters of .2 M HCl 1.1 * .2 = .22 mols of HCL X2CO3 + 2 HCl --> 2 XCl + H2CO3 maybe? so we only need .11 mols of X2CO3 .11 mols of X2CO3 weigh 15.2 grams 1 mol X2CO3 weighs 138 ...
June 28, 2014

physics
By the way, Newton 2 is force = rate of change of momentum F = m A is the simple version but will not work if mass is not constant (rocket or special relativity for example)
June 28, 2014

physics
Force = rate of change of momentum = m a if mass is constant (7.88 - 8)/.04 = -3 (-5.28+5) /.04 = -7 (0 - 0 ) = 0 so yes m a = .140 (do it in kg) * that a vector
June 28, 2014

physics
Now wait a minute. If friction wins, you do not move it in any direction. Again in number two, imagine. If you caught the ball at the top, the time is all spent getting up. If you tossed the ball off your roof, most of the time would be spent going down. So d) Time to reach ...
June 28, 2014

physics
a = change in v/ change in t = -5/1.4 = -3.57 m/s^2 so F = m a = 6(-3.57) = - 21.4 Newtons The friction force will be larger because proportional to the normal force (eight) F = -21.4 (9/6) = -32.1 Newtons friction force F = m a a = -32.1 / 9 = 3.57 m/s^2 so same time, 1.4 ...
June 28, 2014

Physics
You add the final VERTICAL velocity and the constant horizontal velocity as vectors. You can find the direction with trig if you wish, but the vector components imply direction as well as magnitude. For example V = u i + v j where u is the horizontal velocity component v is ...
June 28, 2014

physics
The vertical velocity is 0 at the top v = Vi - 9.81 t 0 = 5.25 - 9.81 t t = .535 second to the top h = 0 + Vi t - 4.9 t^2 h = 5.25 (.535) - 4.9 (.535^2) h = 1.40 meter alternate and faster way: (1/2) m v^2 = m g h [ conservation of energy ] h = v^2/2g = 5.25^2/19.6 = 1.40 meter
June 28, 2014

Physics
sure If you stand on frictionless ice (good luck), your weight is still held up by the ice.
June 28, 2014

Algebra
multiply by 1.10 every month
June 28, 2014

physics
How long to fall ? 54 = (1/2) g t^2 108 = 9.81 t^2 t = 3.32 seconds in the air, screaming and wishing for parachute In 3.32 seconds we went 130 meters at constant horizontal velocity u 130 = t (3.32) t = 39.2 m/s so now convert that to miles/hr. (Google). 87.7 miles/hr it says
June 28, 2014

physics
260,000 m/h * 1 h /3600 s = 72.2 m/s = Vinitial average speed during deceleration = 72.2 / 2 = 36.1 m/s goes 1500 m at 36.1 m/s 1500/36.1 = 41.5 seconds
June 28, 2014

statistics
3 a Yes, 5/15 = 1/3 3 b just add 5/15 + 3/15 = 8/15 3 c p what are chances of d then a then g ? 5/15 * 7/14 * 3/13 = .03846153 d then g then a ? 5/15 * 3/14 * 7/13 = same etc a then d then g a then g then d g then d then a g then a then d six ways in total, each .03846153 so ...
June 27, 2014

statistics
for 2 use : http://davidmlane.com/hyperstat/z_table.html
June 27, 2014

NEED HELP WITH CALC
Yes, you do ds/dt = -.02 s ds/s = -.02 dt ln s = -.02 t + c e^ln s = s = e^(c-.02t) = e^c e^-.02 t e^c = C any old constant in the general solution s = C e^-.02 t when t = 0, s = Si the initial amount so s/Si = e^-.02 t BUT that is P, the fraction remaining so we have part a b...
June 27, 2014

Algebra
2 sqrt (3) * 4 sqrt (3 * 7) = 8 sqrt (3*3*7) = 8*3 * sqrt (7) = 24 sqrt (7)
June 26, 2014

Physics
I assume you mean approaching FROM south for example, so moving north momentum 1500 * 9 N = 13500 N momentum 700 * 15 E = 10500 E final mass = 1500 + 700 = 2200 2200 v cos (heading ) = 13500 2200 v sin (heading)= 10500 tan heading = 10500/13500 heading = 37.9 degrees east of ...
June 26, 2014

Physics
East 5.9 + 2.4 cos 20 = 8.16 north 2.4 sin 20 + .5 = 1.32 d^2 = 8.16^2 + 1.32^2 tan heading = 8.16/1.32 heading east of north = 80.8 deg or heading north of east = 90-80.8 = 9.19 deg
June 26, 2014

physics
a = change in V/change in time = 40/10 = 4 m/s^2
June 25, 2014

linear algebra
http://www.gregthatcher.com/Mathematics/GaussJordan.aspx
June 25, 2014

World Geography
I am very glad Ms Sue answered this because I would have found it necessary to write a book on the subject :) Visions of lateen rigged ships crossing the Indian Ocean from the Spice Islands to East Africa and the Red Sea and caravans trudging overland from the Red Sea to the ...
June 23, 2014

PreCalculus
2x + 2x + x = 200 5x = 200 Pre - Calculus, sure is.
June 23, 2014

Algebra II
f(x+h) = 5/(x+h) f(x) = 5/x [f(x+h) - f(x)]/h = [5x -5(x+h)]/[hx(x+h)] = -5 /[x(x+h) } = -5/(x^2+hx) By the way, if you take the limit of that as h--->0 then you are a calculus student and you just found the derivative d/dx (5/x) = -5/x^2
June 23, 2014

Algebra II
1/(x-a) the domain is all real numbers EXCLUDING x = a where the function is undefined.
June 23, 2014

Suspect typo
I bet it was 0.4 ohm internal resistance.
June 23, 2014

algebra
He is asking the same questions over and over again without trying to do them.
June 22, 2014

algebra
.2 n + 1 n = well, this time it is one of the answers you listed.
June 22, 2014

algebra
4 n + 7 n = now I did the last one, you finish this one. By the way, none of those answers.
June 22, 2014

algebra
7 n - 4 n = 30 3 n = 30 n = 10
June 22, 2014

algebra
-2x + 7x - 2x = -7 + 2
June 22, 2014

Algebra 2
I think you may mean 5^(n-1) try y = 103 * 5^(n-1) when n = 1, y = 103 * 5^0 = 103 when n = 2, y = 103*5^1 = 103*5 when n = 3, y = 103*5^2 = 103*5*5 etc
June 22, 2014

math
originally when n = 0, y = 5 after one month, n = 1 and we should have ten so y = 5 * 2^n after 42 months y = 5 * 2^42
June 22, 2014

Probability
Draw a Venn diagram say we have 100 items 75 are in A or B (25 are outside) 15 are in B 2 of those are also in A (intersection you mean I think) so 13 are exclusively in B That means 75 - 13 = 62 are in A 62/100 = .62
June 22, 2014

Probability
H H H H H H H T H H T T H T T T T T T T
June 22, 2014

Physics
a) No true a) the same as b) but impulse = F dt = delta (mv) F dt = 120 N * 10 s = 1200 N s The change of momentum is M (final velocity - 0) so 1200 N s = M (8 m/s) so M = 150 N s^2/m which is 150 kg note N force =Mass (m/s^2) so N s^2/m = M in kilograms 8 m =
June 21, 2014

first what then what ?
missing input
June 21, 2014

physics
pi r^2 = area = .25 pi = .785 m^2 area * speed = volume/second .785 m^2 * 1.2 m/s = .942 m^3/s times 3600 seconds /hr = 3393 m^3/hr
June 21, 2014

physics
(1/2) rho v^2 = rho g h v = sqrt (2 g h ) = sqrt (2*9.81*1.38) which is exactly what would happen if you just dropped a rock that distance or see http://en.wikipedia.org/wiki/Bernoulli%27s_principle
June 21, 2014

physics
77.9 = 10 log I/10^-12 = log I/10^-11 7.79 = log (I*10^12) 10^7.79 = I * 10^12 6.17 * 10^7 = I * 10^12 I = 6.67 * 10^-5 W/m^2
June 21, 2014

EXCEL 2010 (again)
I just tried =sum(C3:C9)/7 and it worked
June 21, 2014

physics
1) do it the same way I did the previous question 1 2) (bottom derivative top - top derivative bottom ) / bottom squared ( x^4 * 0 - 1*4x^3 )/x*8 = - 4 /x^5 3) x^2 cos x - sin x (2x) you finish
June 20, 2014

physics
1) 0 + 5 + 21 x^2 2) tan x (d cos^2 x /dx)+ cos^2 x d tan x / dx = tan x (-2 sin x cos x) + cos^2 x (sec^2 x) = -2 sin^2 x + 1
June 20, 2014

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