Tuesday
July 22, 2014

Posts by Damon


Total # Posts: 17,486

Algebra: Quadratic Functions
-16 t^2 + 128 t = s - 70 t^2 -8 t = -s/16 + 4.375 t^2 - 8 t + 16 = -s/16 + 20.375 (t-4)^2 = -(1/16) (s - 326) vertex at time = 4 and height = 326

Math
5 green 20 total first green = 5/20 = 1/4 second green = 4/19 (1/4)(4/19) = 1/19

College Math
"Union" Anything in A, B or both 2 , 3, 5 , 6 , 7 , 9 http://mbaker.columbiastate.edu/algebratips_pages/union%20and%20intersection.htm 5 is the intersection of A and B by the way

physics
M is irrelevant at acceleration a, v = a T L = (1/2) a T^2 a = 2 L/T^2

vocabulary power unit 5 grade 6
synonym ----> two words that mean the same thing eg if you had HAPPY then A) miserable B) joyful C) sad E) cantankerous You would circle B (I think :)

Math
4/7 = x/4 x = 16/7

math
0.9 - 6 r -2 (0.2) 0.9 - 6 r - 0.4 0.5 - 6 r

Math
If you multiply the top and bottom of a fraction by the same thing you do not change the value of the fraction. 0.4 * 10 ----------- 0.2 * 10 is exactly the same as 4 ---- 2

math
20 x + 8 - 6 so 20 x + 2

Physics
work to lift = m g h = 750 * 9.81 * 13.2 Joules/minute work for Ke = (1/2)(750)(17.4)^2 Joules/minute C) add those and divide by 60 to get Joules/second or Watts

math
draw radii from center to the three intersections on the circumference all length r sine of half angle up at intersection of 13 cm legs = 5/13 so half angle = 22.6 deg isosceles triangle now with legs r meeting base 13 at 22.6 angle cos 22.6 = r/6.5 r = 6.5 cos 22.6 r = 6

Physics
weight = m g normal force down on floor N= m g+Fsin 28 friction force back = .25 N so F cos 28 = friction force back (a) F = friction force back / cos 28 force component in direction of motion = F cos 28 Newtons d = 4.1 meters so (b) Win = 4.1 F cos 28 Joules (c) -4.1 F cos 28...

math
30 + 10 w - w = 30 + 9 w

Algebra
(1/5) / 3 = 1/(5*3) = 1/15

math
.8 * 14 * 5 = $56

chemistry
CuNO3 molar mass = 63.5 + 14 + 3(16) = 125.5 grams/mol 8.22 g /125.5 g/mol = .0655 mols of the stuff .0655 mols/x liters = .59 mols/1 liter x = .111 liters

Math
2*3*2 = 12 4 of them are red (thick, thin, small Lg) 2 of them (a small and a large) -----------------red ---------small --yellow -----------------blue thick ------------------ red ---------large --- yellow -------------------blue -------------------red ---------small ----yell...

Physics
If your scale reads in grams or kilograms, that is mass assuming you do this on earth without acceleration (do not do it while in free fall before opening your parachute) If your scale reads in pounds, that is really force, not mass. Convert the pounds to kilograms.

physics
THINK !!! B goes up when current goes up, that is what causes B gets weak when you get away from wire of course. so the second choice

Alegbra
You do this one, same way as I did the other one.

Alegbra
8.2*10^5 / 2.75 * 10^-3 = (8.2/2.75) * 10^(5+3) = 2.98 * 10^8

AP Calc
sure, the base is y, the hypotenuse the center of the base is at y/2 half the base = the altitude

AP Calc
It is all in the first quadrant, base = y

AP Calc
area of triangle at x with base y: altitude of triangle is y/2, same as half the base so area = (y/2)(y/2) = y^2/4 y^2 = b^2 (1 - x^2/a^2) so y^2/4 = (b^2/4) (1 - x^2/a^2) integrate that from x = 0 to x = a

College math
LOL - now how am I to respond to that ? Thank you and you are welcome :)

College math
b^2 = 16 4 a c = 24 oh my b^2 - 4 a c is Negative :( That means we have a pair of complex conjugate roots

PHS 105
F = m a F is the same on both (Third Law) m2 a2 = m1 a1 10 m1 a2 = m 1 a1 a 2 = a1 /10 if a1 is 1 then a2 = 0.1 m/s^2

scince i try i have no idea
Google them for example force definition physics yields among other links: http://physics.info/newton-first/

math
200 * 1/3 is one way

math
9/16 or anything else greater than 1/2 and less than 1

AP Calculus
I assumed circumscribed meant outside, but it is unclear indeed.

AP Calculus
sketch the graph of e^x with the rectangles of height e^2, e^4 and e^6 and base of 2 each 2 e^2 + 2 e^4 + 2 e^6 = 2 (e^2 + e^4 + e^6)

physical science
Period = 1/f = (1/5.3)10^-14 seconds distance = speed * time lambda = 3*10^8 m/s * (1/5.3)* 10^-14 = .566 * 10^-6 meters = 566 * 10^-9 meters 10^-9 meters is nanometers, usually used for visible light wavelength

physics
P = angular momentum = I omega I1 = (1/2) m r^2 = (1/2)(4.7)(.17)^2 = .0679 P1 = (.0679) 2 pi (1.8) I2 = I1 + (1/2)(3.1) (.065)^2 = .0679 + .00655 = .0744 P2 = P1 so .0744 (2 pi)(rps) = .0679 * 2 pi *1.8 rps = 1.64 revs/s so I agree with you wholeheartedly

Physics
You are welcome :)

Physics
short string ----> higher frequency !!! f = k/L so (5/4) 440 = 550

English
Not Thanks but Satire :)

math
P = R - C P = 4 x - 2 x - 20 P = 2 x - 20 for 0 profit, x = 10

math
y = 5(1/x) is inverse 5 is the constant You only gave me one relationship.

Physical Science
This is the trouble with OTEC (Offshore Thermal Energy Conversion) where the difference in temperature between deep ocean water and water at the surface (in tropics of course) can be used to run a turbine system and generate electricity or whatever. However the efficiency is l...

Physical Science
if you mix hot and cold water and get warm water the entropy is higher, even if the energy did not change. The availability of that energy is what changed. Between a glass of hot water and a glass of cold water you can run an engine. However there is not much you can do with a...

Physical Science
increase

Physical Science
greater than Carnot cycle 1 - (Tcold/Thot) T in KELVIN (dge C + 273)

Physical Science
P V = n R T well, R does not change :) R = P V/(nT) = P' .5V /(.5n 2T) = P'(.5)V/(nT) so .5 P' = P P' = 2 P

Physical Science
Heat out = Specific heat of ice * mass of ice * change in temp

Physical Science
heat out = specific heat of water * mass of water * (30-0)

Physical Science
go boom !

Physical Science
heat in = SH * m * delta T SH = heat in / ( m* delta T)

Physics
F = k Q1 Q2 / d^2 = 9*10^9 * 1.6*10^-19*1.6*10^-19 / (26.1*10^-30) = .882 * 10^1 = 8.82 Newtons

Dynamics
m = 20*10^6 g = 20*10^3 kg v = 8000m/3600 s = 2.22 m/s Ke = (1/2) m v^2 = 10*10^3 * 4.94 = 4.94 * 10^4 Joules = (1/2) k x^2 x = .4 meter (wow!) x^2 = .16 (1/2) x^2 = .08 so k = 4.94 * 10^4/.08 =61.7 *10^4 N/m = 617,000 N/m

Physics
http://www.jiskha.com/display.cgi?id=1395061565

Physics
I did this already.

Math plz help me!!! URGENT!!
You are welcome.

Math plz help me!!! URGENT!!
(1/3) pi r^2 h = (1/3)(3.14) (100)(6) =628 mm^3 pi r L = 3.14 * 7 * 13 = 286

Calc
what is x is negative or zero Tim ?

Calculus Help Please!!!
I figured the same but he said specifically that a was variable.

Calculus Help Please!!!
2 y dy/dx = 2 x + 2 a da/dx y dy/dx = (x+a da/dx) dy/dx = (x + a da/dx)/y or dy/dx = (x + a da/dx)/(x^2+a^2)^.5 --------------------------------- 2 y dy/dx + a dy/dx + y da/dx = 2 x^2 + a + x da/dx + 2 a da/dx (2y+a)dy/dx = 2 x^2 +a +(x-y+2a)da/dx dy/dx = [2 x^2 +a +(x-y+2a)da...

Physical Science 9
2 H2O ----> 2 H2 + O2 That is a reaction in the outer valence electron shells so despite being a physicist, I call it chemical.

physics
initial momentum = 28000 u final momentum = (m+28000) v so 28000 u = m v + 28000 v initial ke = 14000 u^2 final ke = (14000+.5m)v^2 (14000+.5m)v^2 = .8 (14000 u^2) (14000+.5m)v^2= 11200 u^2 so I have these two equations to work with: 28000 u = m v + 28000 v and 11200 u^2 = (14...

Physics
r = .14 meter w = omega, angular rate in radians/sec Ac = w^2 r F = m Ac 4*10^-11 = 3 *10^-16 (w^2)(.14) w^2 = 9.52 * 10^5 = 95.2 * 10^4 w = 9.76 * 10^2 radians/second rev = 2 pi radians 976 rad/s * 1 rev/2pi rad = 155 rev/s

algebra
- (-3)^2 - 5 (-3) + 6 - 9 + 15 + 6 21 - 9 12 your turn

algebra
You try first. Remember anything at all to the 0 power is ONE.

Physical Science 9
mass heat in = specific heat * mass * temperature rise

Physical Science 9
a compound

Physical Science 9
Pressure. When you reduce the pressure over a liquid surface to below vapor pressure, it boils off. If you increase the pressure, it does not boil until a higher temperature (eg - pressure cooker). The pressure is high enough in the can to hold the contents in a liquid state, ...

math
can vol = pi r^2 (10) = (22/7)(3.5)^2(10) = 385 cm^3 pan vol = 20*9*14 = 2520 cm^3 2520/385 = six and a half

cal
fx = 3 x^2 + 4 y level if x = +/-(4y/3)^.5 fxx = 6 x fxy = 4 fy = 4 x - 4 y level when x = y fyy = -4 fyx = 4 extreme only when x = y = 0 H matrix 6 x 4 4 -4 det = -6x - 4 if x = 0, det = -4 if det <0 then (0,0) is a "saddle point"

math
x^2 y = 2009 I fooled around factoring 2009 and the only square I found that was a factor was 49 49 * 41 = 2009 so 7 * 7 * 41 = 2009 so I have 2 faces that are 7*7 or 49+49 = 98 stickers then I have fours faces that are 7*41 so 4*7*41 = 1148 1148 + 98 = 1246 stickers used 2009...

Physics - Current ????
There is no current specified so row straight across :)

Physics ?
Why would I need a torque to move straight? why would I need any force to move at constant velocity? I am wondering who assigned this question.

Math
width = x length = y kitchen is 10 by x dining room is square so (y-10) = x kitchen area = 10 x dining area = x^2 so 10 x + x^2 = 264 x^2 + 10 x - 264 = 0 (x-12)(x+22) = 0 x = 12 y = x+10 = 22 so living room is 12 by 12 length is 22

Calc
I want a line perpendicular to that line that passes through the point. (There are quick formulas for this but I do not remember them) the line in slope intercept form: 2 y = 2 x + 3 m = 2/2 = 1 so slope of out perpendicular is -1/1 = -1 so y = - x + b goes through (-4,-4) -4 ...

Linear Algebra
1 4 0

Linear Algebra
1 4 2 17 3 1 -5 7 2 -3 -7 -10

Linear Algebra
http://www.gregthatcher.com/Mathematics/GaussJordan.aspx

Probability
prob first one walked, second did not = (18/50) (32/49) = .235 prob second one walked, first did not is the same so .235 * 2 = .47

Probability
18 of the 50 walked probability that the first one walked = 18/50 now you pick a second out of a population of 49 of whom 17 walked so 18/50 * 17/49 = 306/2450 = .125

I really need help
You are welcome, good luck :)

I really need help
5 * 7 * 3 =

I really need help
area of one side of pyramid = (1/2)(11)(15) = 82.5 cm^2 so area of 4 sides = 330 cm^2 but we also have the area of the bottom which is 11*11 = 121 cm^2 so total = 451 cm^2

I really need help
anything with straight sides and a pointed top has volume = (1/3)base area * height here base area = pi r^2 = 314.159 so vol = (1/3)(314.159)(6) = 628.31 mm^3

Pre-Calculus
OIC, ok r = sqrt (25 + 144) = sqrt (169 ) = 13 angle in quadrant 4 tan angle below x axis = 12/5 angle below x axis = 67.4 degrees or 360 - 67.4 = 292.6 degrees

Huh ??
usually they are of form: a i +/- b j

Pre-Calculus
e^i theta = cos theta + i sin theta so 9 e^i(3 pi/2) ----------------- 3 e^i(pi/4) = 3 e^i(5 pi/4) = 3 [cos (5 pi/4) + i sin (5 pi/4)] = 3 (-.707) + 3i(-.707) or -(3/2) sqrt 2 - (3/2) i sqrt 2

Pre-Calculus
cos pi/3 = 1/2 sin pi/3 = sqrt 3/2 so x = 3/2 and y = (3/2)sqrt 2

Pre Calculus
2 e^i(pi/6) * 4 e^i(4pi/6) = 8 e^i(5 pi/6) = 8 [cos (5 pi/6) + i sin (5 pi/6)] 150 degrees , quadrant 2 , 30 above -x axis 8 [ -sqrt3/2) + i (1/2) ] -4 sqrt 3 + 4 i

Physics
well, you must have found the east and south speeds to get the angle from tan angle = speed south/speed east then Vf = sqrt (Vsouth^2 + Veast^2)

Money
No, but I could 86/102 = x/100 x = 100 (86/102)

Money
86 = x(102) x = 86/102 = .842 100 x = percent = 84.2 %

Math
employees earns x manager earns 1.4 x x/1.4 x = 1/1.4 = 10/14 = 5/7

Science
You are welcome :)

Science
That seems reasonable. See for example: http://www.britannica.com/EBchecked/topic/967311/nitrogen-fixing-bacteria

prison effectiveness research question
If you are specific about what sort of teacher you need you do not have to waste the time of mathematicians and other wandering souls.

algebra
That is interesting but not particularly useful. Do you have another line to go with it so we can see where the cross?

chemistry 101
PBr3 is 271 grams per Mol Br is 80 g /mol so Br3 is 240 g/mol (240/271)1.57 = 1.39 grams

Huh?
You can not find the forces or acceleration without more information. The only thing you can use is the First Law, conservation of momentum, which will give you final speed if they stick together. (1/3 the original speed) To answer questions about force and acceleration, you m...

Calculus
You can see that tangent from (0,3), the top of the ellipse, to (12,3) is y = 3 by inspection. The other tangent requires some work :)

Physics
I suspect Flove is in Newtons, not in meters integral F dx from 0 to 2.6 (2/3) x^3 + (3/4) x^4 zero at 0 so just evaluate for x = 2.6 11.71 + 34.27 = 46 Newtons

statistic
a. 1/4 b. 4/52 = 1/13 c. 1/52 d. 13 clubs including jack and 3 other jacks = 16/52 e. 16 face cards , 4 are Jacks 4/16 = 1/4 f if we know we got a heart, it is red 13/13 = 1

math
well first a typical common denominator example find a common denominator to compare 1/3 and 2/5 the denominator will have to have a 3 in it and a five in it In this simple case 3*5 = 15 will work Now find something over 15 that is the same as 1/3 multiply top and bottom by fi...

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