Wednesday
September 2, 2015

Posts by Damon


Total # Posts: 21,874

math
296/8
December 10, 2014

Algebra
256 = (1/2)(32) t^2 because 32 ft/s^2 is g in obsolete units which no one but math teachers remember.
December 10, 2014

Physics >.<
momentum before = 5000*15 + 500*0 momentum after = 5000*9 + 500*V they are the same (Newton #1) so 5000*15 = 5000*9 + 500 V
December 10, 2014

Physical Science
sure, thermal is good
December 10, 2014

Physical Science
You put lots of windows on the South side to heat up a massive wall or water tank inside the windows. That is called passive heating system. Solar energy is electromagnetic radiation. It must be converted to heat energy for example by being absorbed by a black sheet of paper ...
December 10, 2014

Physics
which one floats?
December 10, 2014

Pysical Science
Well, yes, radiation flows through empty space, the others do not which is why a vacuum bottle works but not perfectly :)
December 10, 2014

typos
which is it? why 2 equal signs? if you mean y = -2 x^2 - 6 x + 10 then complete the square -2 x^2 -6 x = y - 10 x^2 + 3x = -y/2 + 5 x^2 + 3 x + 9/4 = -y/2 +5 + 9/4 (x+3/2)^2 = -(1/2) (y -29/2) vertex at x = -3/2 and y = 29/2
December 10, 2014

ratios
1.2 (band posters) = (movie posters) 1.2 b = 24 b = 24/1.2 = 240/12 = 20
December 10, 2014

physics
a negative acceleration in classical mechanics. It can mean other things in other areas of physics.
December 10, 2014

physics
a = F/m a = 405/175 vf = a t where vf is final speed at .245 meters and t is acceleration time average speed = vf/2 .245 = average speed * t .245 = ( vf/2) t so vf t =.49 but vf = a t so a t^2 = .49 (same as d = (1/2) a t^2 ) solve for t then Vf = a t
December 10, 2014

Calculus
You are welcome.
December 10, 2014

AP calc bc
h^2 + x^2 = 625 at t = 0 x=20so h = 15 2 h dh + 2 x dx = 0 dh = -(x/h) dx dh/dt = -(20/15 ) dx/dt = -(20/15).18
December 10, 2014

College Algebra
so just do it for t = 1 , 2.5 and 3
December 10, 2014

College Algebra
t = 1, t = 3 and t = 4 plug and chug eg for t = 1 (which is 8am) 500 * 2^(1/2) 500 * 1.414 = 707
December 10, 2014

Physics HELP!
50 g = .050 kg = m sinusoidal motion kinematics: x = A sin wt v = Aw cos wt a = -Aw^2 sin wt = -w^2x givens: A w^2 = 15 A w = 3.5 so 3.5 w = 15 w = 15/3.5 radians /second first answer Newton #2 F = -kx = m a so -k x = -m w^2 x or w^2 = k/m w = sqrt (k/m) 15/3.5 = sqrt (k/.050...
December 9, 2014

physics
http://hyperphysics.phy-astr.gsu.edu/hbase/Sound/dopp.html
December 9, 2014

Can you check my Math answer please?
when f' changes sign, that is max or min (first derivative test) moving right on x axis f' changes sign, goes - at left maximum to get back up to right maximum, f' must change sign again from - to + that is a minimum
December 9, 2014

physics
r = 2.19 sin 14.8 = .559 meters radius centripetal a = Ac = omega^2 r =v^2/r Look at tension in wire now tan 14.8 = mg/mAc = 9.8/Ac so Ac = 9.8/tan 14.8 = 37.1 m/s^2 so v^2/r = 37.1 v^2 = 37.1* .559 = 20.7 v = 4.55 m/s or for angular rate omega omega^2 r = 37.1 omega^2 = 66.4 ...
December 9, 2014

MATH HELP! Complex Interest
I think you mean compound not complex 850 (1.048)^10 - 850 and 850(.048)(10) 850 (.598) and 850(.480)
December 9, 2014

Math
You are welcome.
December 9, 2014

Math
(1/20) n = 3/4 = 15/20 n = 15 check: 15 pieces * 1/20 long = 15/20 = 3/4 sure enough
December 9, 2014

maths
2pi Rminute - 2 pi Rhour/12
December 9, 2014

math
plug and chug s to start 1/2 s after store 1/4 s after bakery 1/8 s after music so s/8 = 6 s = 6*8 = 48
December 9, 2014

science
a mol of H2O has mass of 2+16 = 18 grams so we have 9.2/18 = .511 mols of H2O that is .511 mols of H2 .511 * 6.02*10^23 = 3.08*10^23 molecules of H2
December 9, 2014

Algebra 2
In general you might find this handy: http://davidmlane.com/hyperstat/z_table.html
December 9, 2014

Pre-Calc/Trig...
You are welcome.
December 9, 2014

Pre-Calc/Trig...
Look at A if x = -2, y = -1/9 + 2 never bigger than 2 if x = +2, y = -9 + 2 goes big - Look at B if x = -2, y = -1/9 - 2 if x = +2, y = -9 -2 goes big - Look at C if x = -2, y = -1/.125+2 if x = 0, y = 2 if x = +2, -.125+2 approaches 2 Look at D also stays close to 2 A is the ...
December 9, 2014

Pre-Algebra help PLZ!!
You are welcome.
December 9, 2014

Pre-Algebra help PLZ!!
3 (7500 r) = 900 7500 r = 300 r = .04 or 4%
December 9, 2014

math
8*7 = 56 7*3 = 21 so 58/7 - 22/3 (58*3)/21 - (22*7)/21 20/21
December 9, 2014

algebra 1
1.75*27 = 47.25 (1.-.4)(47.25) = .6*47.25 = 28.35
December 9, 2014

physics
location of c is (200,-200) location of d x = 200 - 100 cos 45 y = -200 + 100 sin 45 keep heading NW obviously distance = a to d: = 200 sqrt 2 - 100
December 9, 2014

Euler's method help in Calculus?????
graph all that and you will see that Euler slopes slant way below the real exponential curve. You need a higher order method to do this.
December 9, 2014

Euler's method help in Calculus?????
now let's see how we did dy/dx = x y dy/y = x dx ln y = x^2/2 y = C e^(x^2/2) when x = 0, y = 3 so y = 3 e^(x^2/2) when x = 2 y = 3 e^2 = 22.1
December 9, 2014

Euler's method help in Calculus?????
That Anonymous is me, Damon. By the way there are lots of Euler methods. I took the first order one by default because you did not specify.
December 9, 2014

Math
(x+1.5)(x+1.5) = x^2 + 1.5 x + 1.5 x + (1.5*1.5) = x^2 + 3 x + 2.25 get it?
December 4, 2014

Algebra 1
(Y1-Y2)/(X1-X2) = (y+3)/(x-6) (-3 +9)/(6+4) = (y+3)/(x-6) 6/10 = 3/5 = (y+3)/(x-6) 5(y+3) = 3(x-6) your turn
December 4, 2014

Algebra 1
(-4+4) = 0 = -5(3-3) Yes, agree
December 4, 2014

Algebra 1
well just try them 1. -5 + 4 = -5(-7) no way 2. -4+4 = -5 (-8) hardly now you try
December 4, 2014

Algebra 1 HUH ?
An infinite number of them. I think you forgot to post a finite list.
December 4, 2014

Survey of Mathematics
50 (3) = 30 + 0.40 m
December 4, 2014

Algebra
555 = .09 x + .08 (3x) + .06 (7000 - 4x)
December 4, 2014

Needs American history help - Revolution era
Not my thing, sorry.
December 4, 2014

social studies
I only replied to 1. because you suggested that there was no Boston Tea Party. I just happened to be one of the shipwrights who rebuilt the fishing dragger Vincie N into the Boston Tea Party replica brig BEAVER for display at the Tea Party site in Fort Point Channel in Boston...
December 4, 2014

social studies
1. I live near Boston and think not c
December 4, 2014

Pre-Calc/Trig...
assuming the log is base ten 10^y = 10^log x = x otherwise for any base b b^y = b^logb(x) = x
December 4, 2014

physics
the downstream problem is perpendicular to and therefore independent of (except in time) the across problem 400 = 10 t t = 40 seconds then d = 2 t = 80 m
December 4, 2014

Math Help
yes
December 3, 2014

Math
3.5 meters is 350 centimeters 17 centimeters is way smaller.
December 3, 2014

Math please help
need standard deviation sigma
December 3, 2014

science
We do not have your figure so can not help much.
December 3, 2014

Pre-Calc/Trig...
You are welcome.
December 3, 2014

Pre-Calc/Trig...
It is like compound interest (1+r)^n 2,000 * (1.05)^12 12 not 11 because it is at the END of the hour at end of hour we have 1.05 times the initial amount the original + .05 * original = original (1 + .05)
December 3, 2014

Physics
937 N m = 691 foot pounds
December 3, 2014

Physics
Torque * angular velocity = power 176 hp = 131,243 Watts or N m/s 1340 rpm = 140 radians/s so Torque = (131,243 / 140) Newton meters
December 3, 2014

Pre-Calc/Trig...
a r^(n-1) 9^2 (1/9)^4 1/81
December 3, 2014

solving exponential functions
do you mean 2^(7-x) = 1/2 ???????? 2^(7-x) = 2^-1 7 - x = -1 x = 8 OR (7-x) log 2 = log .5 (7-x) = -1 again :)
December 3, 2014

Statistics
I am not sure about that hint. I think it is .9^15 = .206
December 3, 2014

physics - no way
before collision the light glider has kinetic energy of (1/2)5(36) there is no way the final kinetic energy of the system can be more than that but you say the heavy glider has speed 6 AFTER collision (1/2)8(36) That is impossible so there is no point in doing the conservation...
December 3, 2014

Pre-Calc/Trig...
a r(n-1) An = 6 (2/3)^(n-1)
December 3, 2014

Calculus
(16)^2 a + (16) b + c = 46 (18)^2 a + (18) b + c = 64 (20)^2 a + (20) b + c = 60 is 256 a + 16 b + 1 c = 46 324 a + 18 b + 1 c = 64 400 a + 20 b + 1 c = 60 you can solve that by substitution or elimination but I go to a Gauss Jordan calculator http://www.gregthatcher.com/...
December 3, 2014

algebra
let z = x^2 z^2 - 29 z + 100 = 0 ( Z-25 )( z- 4 ) = 0 z = 25 then x = +5 or -5 or z = 4 then x = +2 or -2
December 3, 2014

Math
1.055 S = 38560.25
December 3, 2014

Algebra 1
4^1 = 4 4^2 = 16 4^3 = 64 4^4 = 256 4^x or four to the x power (not 4x)
December 3, 2014

English
Facts: It is difficult to escape the influence of television. If you fit the statistical averages, by the age of 20 you will have been exposed to at least 20,000 hours of television. You can add 10,000 hours for each decade you have lived after the age of 20. The only things ...
December 3, 2014

English
d.)After the politician had broken his promises, the general public viewed his pledges skeptically. b.)If you were taller, you could try out for the basketball team. I have no idea what indicative mood is but thought it expressed fact such as I AM wealthy. I do not have the ...
December 3, 2014

Please tell us what the rest of the question is
I have no idea what the angular velocity is or if it is rolling without slipping or whatever
December 3, 2014

Pre-Calc/Trig...
You are welcome.
December 3, 2014

Pre-Calc/Trig...
log y = log b + log x
December 3, 2014

2 math ?s
sin T + cos T cot T sin T + cos T cos T/sin T (sin^2 T + cos^2 T ) /sin T 1/sin T which is csc T ============================= LOL, subtract cos^2 T from both sides 1 = cos^2 T + sin^2 T what else is new :)
December 3, 2014

3 Math
That IS the property a*b = b*a It is true all the time until you get to matrix multipication
December 3, 2014

english
http://www.yourdictionary.com/metaphor
December 3, 2014

social studies
http://digital.library.okstate.edu/encyclopedia/entries/I/IN015.html
December 3, 2014

Science
LOL, well mass is conserved OVERALL but that includes the CO2 smoke pouring out the stern of your toy motorboat. To make it work out right, you better catch all the products :) see: http://chemistry.about.com/od/chemicalreactions/f/What-Is-The-Equation-For-The-Reaction-Between...
December 3, 2014

Algebra
Just write the words as symbols n = 2 r - 10
December 3, 2014

physics
Vi = 250 sin 45 = 125 sqrt 2 initial up u = 125 sqrt 2 forever horizontal v = 125 sqrt 2 - 9.81 t v at top = 0 9.81 t = 125 sqrt 2 solve for t at top h = Vi t - 4.9 t^2 solve for h at top total time in air = 2 t d = 2 u t
December 3, 2014

math
1 n and 20 c 2 n and 15 c 3 n and 10 c 4 n and 5 c 5 n
December 3, 2014

Physics
assume metric ton of 1000 kg tension = m g = 30*10^3 *9.81 Newtons area = pi r^2 5*10^-3/10 = 30*10^3*9.81 /[pi r^2 *2*10^9]
December 3, 2014

Precalculus
(x^2-2x+1) - (y^2-4y+4) - 4 = 0 (x-1)^2 - (y-2)^2 = 4
December 3, 2014

ap calc
been there , done that: http://www.jiskha.com/display.cgi?id=1324077814
December 2, 2014

Physics
h = Hi + Vi t - 4.9 t^2 0 = 32 + Vi (6) - 4.9(36) 6 Vi = 144.4 so Vi = 24.1 m/s up u = 161/6 = 26.8 horizontal tan theta = Vi/u Vo = sqrt (u^2 + Vi^2)
December 2, 2014

calc found one mistake
integral r^3 dR dT from 0 to 4 and 0 to 2pi 2 pi (4)^4/4 = 128 pi on the bottom SAVE that on the top, x^2+y^2 = r^2 = 4 and z^2 = 16 so you have (r^2+16)r dr dT from 0 to 4 and from 0 to 2 pi so 2 pi [ (4^3)/3 + 16 (4^2)/2 ] note over 3 2 pi (64/3 + 256/2) = 298.67 pi you do ...
December 2, 2014

calc
draw a picture x^2 + y^2 = 16 is a circle of radius 4 it extends up as a round cylinder from z = 0 to z = 4 and we must also integrate over the top and bottom Now as Mathmate told you it is easier to do this in polar coordinates because it is a cylinder with its centerline up ...
December 2, 2014

Physics
Ac = omega^2 R = V^2/R
December 2, 2014

Physics
What DonHo wrote is correct, but it asks for omega, the angular speed
December 2, 2014

Physics
v^2/r =omega^2 r = g = 9.81 m/s^2 omega^2 = 9.81/50.5 (radians/sec)^2
December 2, 2014

calc
x^2 + z^2 = r^2 is a circle with radius r read what mathmate wrote for you.
December 2, 2014

MATH
how many ways to combine five things three at a time? n!/[r!(n-r)!] 5!/[3!(2!)] 5*4/2 10 ========================== 4 along each long side with no ends 5 along each short side including end posts 9*2 = 18
December 1, 2014

Please help Damon
You are welcome.
December 1, 2014

Please help Damon
looks right to me
December 1, 2014

physics
Just follow my way using the diameter and multiply by 4 at the end. A = pi d^2/4
December 1, 2014

physics
r = .019/2 = .0095 you have a decimal point off in the diameter too
December 1, 2014

physics
.5/306 = .00163, not .0163
December 1, 2014

physics
whoops I used diameter use 4*1.45 = 5.8 m/s
December 1, 2014

physics
I get 1.45 m/s
December 1, 2014

physics
area of pipe * speed of water = Q = flow volume/second area = pi (.019)^2 volume = 0.5 m^3 time = 5.1*60 = 306 so pi (.019)^2 V = .5 m^3/306 s solve for V in m/s
December 1, 2014

History Help?
He is called the father of Texas because he brought the 300 anglo colonist families in to a land grant he obtained from the Spanish before Mexico split from Spain.
December 1, 2014

Calculus
2/12pi = 1/(6pi) agree
December 1, 2014

Calculus
dV/dt = 2 cm^3/s dV/dh = surface area = pi r^2 dV/dt = dV/dh * dh/dt so dh/dt = dV/dt / pi r^2 so you need r, the radius of the surface 2 cm up from the bottom of the 4 cm radius sphere I do not remember the length of a circle sector halfway from the center to the edge, look ...
December 1, 2014

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