Tuesday
July 22, 2014

Posts by Damon


Total # Posts: 17,481

Calculus
http://www.wolframalpha.com/widget/widgetPopup.jsp?p=v&id=7c9206fea2b96c1f22626b03b18327b3&title=Math+Help+Boards:+Indefinite+Integral+Calculator&theme=blue says: (x-1)/[7 sqrt(x^2-2x+8) ]

Calculus
∫(x2 − 2x + 8)^-1.5 dx

Calculus - not sure how but rewrote
I do not know but suspect you mean ∫1/(x^2 − 2x + 8)^(3/2) dx

physics
101.5 * 10*3 + 1029 *9.81 * 9.5 = 101.5 * 10^3 + 95.898 * 10^3 = 197 k Pa or about 2 atmospheres note, 30 feet deep is about additional atmosphere

physics
x = A sin wt v = A w cos wt a = -A w^2 sin wt = -w^2 x F = m a so -kx = - m w^2 x w^2 = k/m w^2 = k/.0029 w = 18.6 sqrt k when w t = 2 pi, t = T = 5.5 so (18.6 sqrt k) (5.5) = 2 pi sqrt k = .0615 k = .0038

physics
x = .084 sin wt max x = .084 when sin w t = 1 then Pe = (1/2) k x^2 = (1/2) 204)(.084)^2 now what is Ke when sin wt = 1? v = .084 w cos wt if sin wt = 1, then cos wt = 0 because sin^2 + cos^2 = 1 always so v = 0 when sin wt = 1 so TOTAL energy = PE at sin wt = 1 = (1/2) (204)(...

physics
x = a sin wt v = a w cos wt a = -a w^2 sin wt = -w^2 x F = m a = -kx when x = 0, equilibrium , sin wt = 0 and cos wt is 1. That is max velocity when w t = pi/2, cos wt = 0 so v = 0 v = a w cos wt which is certainly not constant a = -a w^2 sin wt = -w^2 x which is 0 when x = 0 ...

physics
from t = 0 to t = .02 she goes(.21 - .043) = .167 .167 m / .02 seconds = 8.35 m/s

english
multiple sclerosis Is the correct spelling I think.

PHYSICS
calculate distance 20*2 + 40*2 + 60*6 = calculate time 2+2+6 av speed = distance/time

Biomechanics
You exceeded he elastic limit of the material and permanent bending occurred.

Algebra
5*4 the rest cancels.

Algebra
(x-3)(x+5) well, if x were 4 It could be 9 x 1 or if x were 5 it could be 10 x 2 or if x were 6 it could be 11 x 3 or if x were 7 it could be 12 x 4 etc

Science
This question would take all night to answer. I will just make a suggestion or two. Just think about sources. Obviously burning carbon causes CO2 no matter what form the carbon takes (coal, diesel, gasoline, methane ..... ) Some create more problems than others, coal for examp...

Damon, Still need your help please tho
You are welcome :)

Damon, Still need your help please tho
y = k/x 4 = k/6 k = 24 so y = 24/x Just do what it says :)

Damon, Still need your help please tho
LOL, many years ago.

Damon, Still need your help please tho
I guess C which is 7; where x =/ 2 assuming that x=/2 means not when x = 2

Damon, Still need your help please tho
7 where x not equal to 2 (x=2 is not in the domain, function undefined there)

Damon, Still need your help please tho
7(x-2) /(x-2) = 7 * 1 = 7 but x may not be 2 or the original denominator would be zero

Damon, Still need your help please tho
did the first one already http://www.jiskha.com/display.cgi?id=1402703533#1402703533.1402705078

Algebra ll
You are welcome.

Algebra ll
x = 3, y = 12 Step 2: Enter the values for your matrix, and press the "Solve" button. Divide row1 by 4 1 -1/2 -3 3 -1 -3 Add (-3 * row1) to row2 1 -1/2 -3 0 1/2 6 Divide row2 by 1/2 1 -1/2 -3 0 1 12 Add (1/2 * row2) to row1 1 0 3 0 1 12

Algebra ll
+4 -2 -12 +3 -1 -3 gauss jordan see http://www.gregthatcher.com/Mathematics/GaussJordan.aspx

Tricky Math tho (Damon)
Yes, C

Tricky Math tho (Damon)
OH !! remainder allowed just do long division 5x - 5 with remainder of 3 so 5x - 5 and 3/(5x-3)

Tricky Math tho (Damon)
try factoring the top. If this problem is possible, a factor is (5x-3) (5x-3)( 5x +or-6 to get 18) (5x-3)(5x-6) hey are you sure it was not 25 x^2 -45 x + 18 ?????

Almost done with this math tho
It is 7 but there is no solution if x = 2 (undefined, zero denominator, not in domain)

Almost done with this math tho
7(x-2) / (x-2) = ?

Algebra
do you mean 1/x + 1/(x+5) + 1/(3x) = 100/225 ???? 225/x +225/(x+5) + 75/(x) = 100 300/x + 225/(x+5) = 100 (x+5)(300) + 225 x = 100x(x+5) 300 x + 1500 + 225 x = 100 x^2 + 500 x 100 x^2 -25 x -1500 = 0 20 x^2 - 5 x - 300 = 0 4 x^2 - x - 60 = 0 (x-4)(x+15) = x = 4 or x = -3.75

this math tho (Damon or Steve)
30 = 5 * 2 * 3 all prime numbers so sqrt (30) is sqrt (30) period however sqrt on the bottom is no fun, should rationalize multiply top and bottom by sqrt 30 (5/sqrt30)(sqrt30/sqrt30) = (5 sqrt 30) /30 = sqrt (30) /6

this math tho
You are welcome :) No thinking, just doing and CHECKING

this math tho
x^2 - 6 x + (6/2)^2 = 7 + (6/2)^2 x^2 - 6 x + 9 = 7 + 9 (x-3)^2 = 16 (x-3) = 4 or (x-3) = -4 x = 7 or x = -1 check 1 + 6 = 7 49 - 42 = 7

Another this math tho
2 * 1 = 2 b^-6 * b^12 = b^(-6+12) = b^6 so yes, 2 b^6

this math tho
well, first of all, check your answer back in the originl for example if x = 8 3 (8-4) + 54 = -3(8) ???? 12 + 54 = -24 I doubt it Now let me try 3 x - 12 + 54 = -3 x 6 x + 42 = 0 x = -42/6 = -7 now check that back in the original

ALGERBRA
that comes out to: .0004952 or use combinations 13 hearts in deck number of combinations of 5 in 13 = c(13,5) = 13!/[ 5!(8!) ] = 1,287 5 in 52 = 52!/[5!(47!)] = 2,598,960 quotient = .0004952

ALGERBRA
first card 1/4 second card 12/51 third card 11/50 fourth card 10/49 fifth card 9/48 multiply :)

math
You are welco0me. Just remember to reverse arrow when multiplying (or dividing) by negative quantity

math
14 < -2x 7 < -x or -7 > x reverse arrow when multiplying by negative quantity or x <-7 check that, for example if x = -8 14 + 7x = 14 - 56 = -42 5 x = -40 so yes, 14 + 7x < 5x

Financial Math
2500 * (1.03^6) = 2985.13 now 2985.13 (1+ .05/12)^24 = 3298.39 3298.39 -2500 = 798.39

English
5 is the only one that sounds right to me.

algebra
look at that second equation. You can easily solve it for y namely y = 2x-1 so use (2x-1) for y in the first equation 3 x - 4(2x-1) = 5 3 x - 8 x + 4 = 5 -5 x = 1 x = -1/5 then y = -2/5 -1 = -7/5 check that -3/5 +28/5 = 25/5 = 5 yes, checks -2/5 + 7/5 = 5/5 = 1, yes, so we hav...

algebra
x = 3 , y = 2 is the intersection

algebra
http://www.wolframalpha.com/input/?i=plot+y%3D2x-4+and+y%3D5x-13

algebra
https://www.wolframalpha.com/input/?i=plot+y%3D2x-4+and+y%3D5x-13

Math
You are welcome.

Math
anything to the 0 power is 1 anything divided by itself is one unless the denominator is zero.

typo
plus or minus 60 x

maths
natural log (base is e) is usually written ln(x) ln (e^x) = x ln e but ln e = 1 so ln (e^x) = x * 1 = 1 argument is somewhat circular but I do not know what else to say.

algebrahave i done this right
You are welcome :)

algebrahave i done this right
mean = 1770/27 = 65.56 mode is clearly 70 if there are ten of them median, there are 10 below 70 and 4 above 70 so the median is in your 70 group, yes the range is from 40 to 90 so yes 50

algebrahave i done this right
I do not understand. is your data set 2 90 s 5 80 s 10 70 s etc? if so I count 27 data points not 25

typo?
the height is 5 meters? do you mean the length is maybe 50 meters? anyway perimeter = 2*L + 2*W area = L * W

PHYSICS
centripetal acceleration Ac = R omega^2 R = earth radius at equator but R = 0 at poles rotation of earth tries to throw you off into space but gravity holds you on earth. g = 9.81 - R omega^2

Algebra please can you ck my work
check my earlier answers things are getting worse except for the 152 ---512 typo

algebra/please can you ck my answers
log base ten of 16.9 = 1.23 log2 (512 not 152) = 9 because base^log x = x 2^9 = 512 log 1 = 0 for any base at all because any base^0 = 1 log base 10 = log10(.046) = -1.34 that is NEGATIVE 1.34

PHYSICS
LOL, try it with anything on your desk, gently ! it will experience BOTH angular acceleration (spin) and linear acceleration.

Algebra
You are welcome.

Algebra
40/1.6 = n/5 so n = 200/1.6 = b) 150 * 1.6/40 =

USA Colonists History
http://www.mainememory.net/sitebuilder/site/283/page/546/display

USA Colonists History
... or fresh water :)

USA Colonists History
The English had a serious problem finding tall white pines for masts in Europe, particularly when they were having trouble with countries around the Baltic Sea. I do not do land, sorry.

USA Colonists History
catch cod, sell it in the West Indies and Europe catch beavers, sell fur in Europe

Physics
1 * 605 * 10^-9 * .85 / 5.4 *10^3 = 95 * 10^-6 m = .095 mm

Physics
yes, up means higher frequency

Physics
yes

algebra
1 and 2 that is 2/6 or 1/3 450/3 = 150

Physics
wait a minute, add the weight of the ball!. 10 + 10*9.81 = 108 N

Physics
You are welcome.

Physics
Force * time = impulse = change in momentum T (10) = 10 * 10 T = 10 N which by the way is about the weight of the ball on earth. I think it would take longer.

physics
distance = speed * time with no force in horizontal direction 65 = 14 t t = 4.64 seconds in the air In the vertical direction it simply falls a distance h h = (1/2) g t^2 = 4.9 (4.64^2) h = 106 m

Physics
80 cal = 335 joules so Lf = 335 Joules / .001 kg - 335,000 Joules/kg potential energy = m g h m g h = m (335,000) 9.81 h = 335,000 h = 34,149 meters

PHYSICS
2 pi radians every 60 seconds 2 pi/60 = pi/30

Physics
call side of square = 1 look at components along diagonal 2(1.1 *1.1 /1^2)cos 45 = 1.1 q/(sqrt2)^2 cos 45 = 1/sqrt 2 2(1.1) = q/sqrt 2 q = 2.2 sqrt 2

Physics
F = m a F = E q same for both where q = electron charge, + for proton, - for electron m = mass electron for electron m = mass proton for proton

Science
Something you do to get something going. https://www.google.com/search?q=stimulus+definition&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a&channel=sb

Math
pi d^2/4 h (3.14 * 7.4*7.4 * 2.4 ) / 4

MATH
integral of e^(Lx)dx = (1/L) e^(Lx) + c

Physics
F = m a = -kx if x = A cos w t v = dx/dt = -Aw sin w t a = d^2x/dt^2 = -A w^2 cos w t = -w^2 x so -m w^2 x = -k x w^2 = k/m w^2 = 210/3 = 70 w = sqrt(70) = 8.37 when |x| = .23 , |v| = .72 .23 = A cos 8.37 t .72 = -A (8.37) sin 8.37 t so cos 8.37 t = .23/A sin 8.37 t = .086/A c...

Physics
North south problem 7.5 Vn = 4.5 (8.5 cos 30) -7.5(6.5 sin 20) East west problem 7.5 Ve = 4.5(8.5 sin 30) +7.5(6.5 cos 20)

math equation
1/3 + 1/4 = 4/12 + 3/12 = 7/12 right 12/12 - 7/12 = 5/12 right he has 5/12 left so 5/12 of salary = 400 multiply both sides by 12/5, the inverse 60/60 of salary = (12/5) * 400 = 12 * 80 = 960

physics
F = k x 10.5 = k (.72 k = 10.5 N/.72 m

Science(electric circuits)
Maybe the total current is the sum of the currents through the individual paths.

Physics
1/Req = 1/1 + 1/2 + 1/4 1/Req = 4/4 + 2/4 + 1/4 = 7/4 so Req = 4/7 The voltage is the same across all elements in parallel i for the 4 ohm = 6/4 = 1.5 amps P = i V or i^2 R = 1.5 * 6 or 2.25 * 4 = 9 watts

Physics
voltage across resistor = i R = 1.5*5 = 7.5 Volts voltage loss to internal resistance = 1.5 * .15 = .225 volts total voltage = 7.5 + .225 = 7.725 Volts

physics
.2 kw * 10 = 2 kw hr per day times 365 = 730 kw hr per year times .15 dollar/kw hr = $109.50 per year = $110 rounded to nearest dollar

Science(electric circuits)
If elements are in parallel, each sees the same voltage and the current is split up between them.

physics
100 * (.4/.05) = 800 N arms 0.4 meters long? That is one big nut cracker.

physics
F * 10 = 600 * 4 F = 600 * .4 = 240 N if you tried to lift at the other end F2* 10 = 600 * 6 F2 = 360 N

physics
http://www.jiskha.com/display.cgi?id=1402590278

Science(electric circuits)
voltages across individual elementsd add in a series circuit.

Science(electric circuits)
If you take one element out of a series circuit, no current can flow and all elements lose power. Remember the old Christmas tree lights that were wired in series? If one went out, they all went out.

Science(electric circuits)
If devices are wired in series, the same current goes through each of them.

science (help)
water, fresh and salt.

Algebra
clark + clark + 5 = 33 2 clarks = 28 clark = 14 so shelly = 19

Math
6x,xx5 so 11 + 3 x = 23 3 x = 12 x = 4 64,445

Physics
south 7-3 = 4 east 7-4 = 3 d = sqrt (9+16) = 5km tan theta = 3/4 where theta is angle east of south theta = 36.9 deg east of south or 180 -36.9 = 143.1 on your compass clockwise from north

Physics
no idea, depends on coef of friction between road and man's shoes.

physics
Take moments about foot of ladder of length L 200 (L/2) sin 30 = F L sin 60 50 = F sin 60 F = 57.7 N

Math
area of layer = pi D^2/4 = 3.14 (49/4) = 38.465 in^2 8 layers = 307.72 in^2 divide by 55 5.6 batches so make 6

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