Thursday
August 21, 2014

Posts by Damon


Total # Posts: 17,955

Math
-1 * 14.8 -2 * 7.4 -4 * 3.7
March 18, 2014

help i have no idea!!!!!!
Now wait a minute, try this yourself.
March 18, 2014

help i have no idea!!!!!!
1 m/s * 5 * 60 = 300 so she has 100 left to walk
March 18, 2014

help i have no idea!!!!!!
d = rate * time 45 * 4 = rate * 5 rate = 45 * 4 / 5 = 36 km/h
March 18, 2014

carver
If each grandchild gets half a cup of sugar in punch, Bruce missed the class on nutritional errors.
March 18, 2014

Linear Algebra
That is fine as long as you did not skip any parentheses when you typed the question as Steve asked. We are all assuming that h^3 is in the numerator.
March 18, 2014

Linear Algebra
2 were wrong, he told you what was wrong.
March 18, 2014

Physics
work is the product of force and the distance moved in the direction of the force. No motion = no work
March 18, 2014

physics
Initial momentum = 2(200) -9(20) = 400 - 180 = 220 final momentum = 11 v Conservation of momentum, Newton's First Law ---> 220 = 11 v so v = 20 m/s
March 18, 2014

Discrete Mathematics
36 possibilities total white = 1 ---> 5 with white smaller white = 2 --> 4 . . . white = 5 --> 1 In other words 5+4+3+2+1 = 15 out of 36 15/36 = .417
March 18, 2014

Math
275 - 225 = 50 degrees difference in heading In two hours Ship A went 16 * 2 = 32 Sbip B went 20 * 2 = 40 c^2 = a^2 + b^2 - 2 a b cos C c^2 = (32)^2 + (40)^2 -2(32)(40)cos 50 c^2 = 1024 + 1600 - 1646.5 c^2 = 978.4 c = 31.3 For pert B, similar triangle, double time, double ...
March 18, 2014

Quadratic Functions in Algebra
x^2 - 6 x = C-20 x^2 - 6 x + 9 = C - 11 (x-3)^2 = C-9 vertex at x = 3,000 and cost = 900
March 18, 2014

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
March 18, 2014

Math
5 green 20 total first green = 5/20 = 1/4 second green = 4/19 (1/4)(4/19) = 1/19
March 18, 2014

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
March 18, 2014

physics
M is irrelevant at acceleration a, v = a T L = (1/2) a T^2 a = 2 L/T^2
March 18, 2014

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 :)
March 18, 2014

Math
4/7 = x/4 x = 16/7
March 18, 2014

math
0.9 - 6 r -2 (0.2) 0.9 - 6 r - 0.4 0.5 - 6 r
March 17, 2014

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
March 17, 2014

math
20 x + 8 - 6 so 20 x + 2
March 17, 2014

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
March 17, 2014

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
March 17, 2014

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...
March 17, 2014

math
30 + 10 w - w = 30 + 9 w
March 17, 2014

Algebra
(1/5) / 3 = 1/(5*3) = 1/15
March 17, 2014

math
.8 * 14 * 5 = $56
March 17, 2014

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
March 17, 2014

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 ----...
March 17, 2014

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.
March 17, 2014

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
March 17, 2014

Alegbra
You do this one, same way as I did the other one.
March 17, 2014

Alegbra
8.2*10^5 / 2.75 * 10^-3 = (8.2/2.75) * 10^(5+3) = 2.98 * 10^8
March 17, 2014

AP Calc
sure, the base is y, the hypotenuse the center of the base is at y/2 half the base = the altitude
March 17, 2014

AP Calc
It is all in the first quadrant, base = y
March 17, 2014

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
March 17, 2014

College math
LOL - now how am I to respond to that ? Thank you and you are welcome :)
March 17, 2014

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
March 17, 2014

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
March 17, 2014

scince i try i have no idea
Google them for example force definition physics yields among other links: http://physics.info/newton-first/
March 17, 2014

math
200 * 1/3 is one way
March 17, 2014

math
9/16 or anything else greater than 1/2 and less than 1
March 17, 2014

AP Calculus
I assumed circumscribed meant outside, but it is unclear indeed.
March 17, 2014

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)
March 17, 2014

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
March 17, 2014

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
March 17, 2014

Physics
You are welcome :)
March 17, 2014

Physics
short string ----> higher frequency !!! f = k/L so (5/4) 440 = 550
March 17, 2014

English
Not Thanks but Satire :)
March 17, 2014

math
P = R - C P = 4 x - 2 x - 20 P = 2 x - 20 for 0 profit, x = 10
March 17, 2014

math
y = 5(1/x) is inverse 5 is the constant You only gave me one relationship.
March 17, 2014

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 ...
March 17, 2014

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...
March 17, 2014

Physical Science
increase
March 17, 2014

Physical Science
greater than Carnot cycle 1 - (Tcold/Thot) T in KELVIN (dge C + 273)
March 17, 2014

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
March 17, 2014

Physical Science
Heat out = Specific heat of ice * mass of ice * change in temp
March 17, 2014

Physical Science
heat out = specific heat of water * mass of water * (30-0)
March 17, 2014

Physical Science
go boom !
March 17, 2014

Physical Science
heat in = SH * m * delta T SH = heat in / ( m* delta T)
March 17, 2014

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
March 17, 2014

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
March 17, 2014

Physics
http://www.jiskha.com/display.cgi?id=1395061565
March 17, 2014

Physics
I did this already.
March 17, 2014

Math plz help me!!! URGENT!!
You are welcome.
March 16, 2014

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
March 16, 2014

Calc
what is x is negative or zero Tim ?
March 16, 2014

Calculus Help Please!!!
I figured the same but he said specifically that a was variable.
March 16, 2014

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...
March 16, 2014

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.
March 16, 2014

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 = (...
March 16, 2014

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
March 16, 2014

algebra
- (-3)^2 - 5 (-3) + 6 - 9 + 15 + 6 21 - 9 12 your turn
March 16, 2014

algebra
You try first. Remember anything at all to the 0 power is ONE.
March 16, 2014

Physical Science 9
mass heat in = specific heat * mass * temperature rise
March 16, 2014

Physical Science 9
a compound
March 16, 2014

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, ...
March 16, 2014

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
March 16, 2014

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"
March 16, 2014

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...
March 16, 2014

Physics - Current ????
There is no current specified so row straight across :)
March 16, 2014

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.
March 15, 2014

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
March 15, 2014

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...
March 15, 2014

Linear Algebra
1 4 0
March 15, 2014

Linear Algebra
1 4 2 17 3 1 -5 7 2 -3 -7 -10
March 15, 2014

Linear Algebra
http://www.gregthatcher.com/Mathematics/GaussJordan.aspx
March 15, 2014

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
March 15, 2014

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
March 15, 2014

I really need help
You are welcome, good luck :)
March 15, 2014

I really need help
5 * 7 * 3 =
March 15, 2014

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
March 15, 2014

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
March 15, 2014

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
March 15, 2014

Huh ??
usually they are of form: a i +/- b j
March 15, 2014

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
March 15, 2014

Pre-Calculus
cos pi/3 = 1/2 sin pi/3 = sqrt 3/2 so x = 3/2 and y = (3/2)sqrt 2
March 15, 2014

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
March 15, 2014

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)
March 15, 2014

Money
No, but I could 86/102 = x/100 x = 100 (86/102)
March 14, 2014

Pages: <<Prev | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | Next>>

Search
Members