Tuesday
November 25, 2014

Posts by Damon


Total # Posts: 19,551

physics
P = m V m (2) = 100 m = 50 kg
November 18, 2014

Algebra
power = V i = V( V/R) = V^2/R sure enough to triple the power at the same V, use 1/3 the resistance R This can be done easily and very understandably by running three of the original Rs in parallel, like turning three stove burners on instead of one.
November 18, 2014

Algebra
Yes, it makes sense, 7 times further is 1/49 th of brightness
November 18, 2014

Algebra
7*7 = 49 which is about 50
November 18, 2014

Math
12 - 18 = -6
November 18, 2014

Math
2 is D.
November 18, 2014

algebra 1
-64 = -4*-4*-4 = -4^3 (x^8)^1/3 = x^(8/3) (x^5)^(1/3) = x^(5/3 -4 x^(8/3) y^(5/3)
November 18, 2014

Physics
sin^-1 (1/1.49)
November 18, 2014

Physics
NET force = 2100 - 1800 !!!!!!!
November 17, 2014

Physics
1. a = F/m = (2100-1800)/1200 2. d = (1/2) a t^2 = 50 a 3. v = a t = 10 a
November 17, 2014

Algebra - quick question
if y = a e^kx then dy/dx = = k a e^kx = k y if it is discrete yn+1 = yn + k yn = (1+k) yn hen yn+1 - yn = k yn in other words the change = constant times present value
November 17, 2014

math
t = FINAL tuna e/(t-15) = 2/3 e/t = 1/3 so finally t = 3 e e/ (3e -15) = 2/3 3 e = 6 e - 30 e = 10 t = 3 t = 30
November 17, 2014

Algebra - Can you PLEASE check - I
if interest rate is 2% per year compounded yearly then Yn+1 = Yn + .02 Yn = Yn (1.02) and in general Y = Yinitial * (1.02)^n
November 17, 2014

Algebra - Can you PLEASE check - I
The important thing here is that the rate of change is proportional to your present value, so the change keeps changing. The most common example is compound interest
November 17, 2014

Algebra - Can you PLEASE check - I
I believe 1 and 6 are the same question asked different ways.
November 17, 2014

Algebra - Can you PLEASE check - I
Yes, it told you to keep doing it until you get to 11.04, that was after 5 days (I cheated and took the log of both sides so solve directly)
November 17, 2014

Algebra - Can you PLEASE check - I
10.82 fifth day 10.82*1.02 = 11.04 done
November 17, 2014

Algebra - Can you PLEASE check - I
I guess I did not explain very well in the first question for example it asks you to plug and chug from 0 to 11.04 I did not bother but first day 10*1.02 = 10.2 second day 10.2 * 1.02 = 10.4 third day 10.4 * 1.02 = 10.61 fourth day 10.61 * 1.02 = etc until you get to 11.04
November 17, 2014

Algebra - Can you PLEASE check - I
11.04 = 10 (1.02)^n I am not going to try lots of days, boring log 11.04 = log 10 + n log 1.02 4.996 days so five days 2. n>0 and <the life of the plant 3. when n = 0, height = 10 4. the height of the plant when we bought it 5. F(n+1) = F(n) * 1.02 6. calculate F(1) = 10...
November 17, 2014

Science 8
volume = mass/density the volume of this thing =28.0-15.6 = 12.4 mL so the density = 101.7 g/12.4 mL = 8.2 g/mL Is that the density of copper ?
November 17, 2014

Algebra - can you PLEASE double check my work?
sqrt 2 * sqrt 2 = 2 = 2/1 you can not write sqrt 2 as a ratio of integers but you certainly can write 2 as a ratio and 2 is sqrt 2 * sqrt 2 by definition However do not try to write 1.41 etc * 1.41 etc as a ratio
November 17, 2014

Algebra - can you PLEASE double check my work?
1 and 2 look fine There is nothing you can multiply sqrt 2 by to get a rational number but sqrt 2 or a multiple thereof L * W yes 4*2 x = 8 x as we said above if you multiply sqrt 2 by sqrt 2 it comes out a perfectly rational 2 HOWEVER, you better do it symbolically with sqrt ...
November 17, 2014

math (stats)
Just go here http://davidmlane.com/hyperstat/z_table.html
November 17, 2014

physics
1.7 x = 26*9.81*.75
November 17, 2014

math
sorry h/33 = 6/4 = height/shadow
November 17, 2014

math
33/h = 6/4
November 17, 2014

Algebra
and (c) is 2800 but (b) you actually have to calculate first you do not mean what you typed you mean P(t) = 2800/ ( 1 + 6e^−0.05t ) now it t = 12 months p = 2800 / ( 1 + 6 /e^.6) = 2800 / 4.29 = 652 USE PARENTHESES for denominators with multiple terms
November 17, 2014

Trig
tan 65 = h/16 so h = 16 tan 65
November 17, 2014

Physics
I did this all out for you earlier. Scroll down.
November 17, 2014

Physics
d = 4 /(.00289 - .000667) = 4/.0022 = 1818 m
November 17, 2014

Physics
= 1818 m
November 17, 2014

NO!!!
d = 4 /(1/Va -1/Vw)
November 17, 2014

Physics
but all it asked for was d = 1380 meters
November 17, 2014

math
oh, if you graphed carefully, no need to do (31.11,31.11) because it is above others. however the (70,0) point where b hits the x axis should be checked even if you can see it is not going to be max.
November 17, 2014

LINEAR PROGRAMMING
orange crates = x grapefruit crates = y constraints a)4x+6y</= 300 b)60 x + 75 y</= 4200 c)y</= x maximize p = 2.5 x + 4 y graph those constraint lines and mark intersections a hits c at (30,30) b hits c at (31.11, 31.11) a hits b at (45,20) our region is between the ...
November 17, 2014

algebra
note for t = 400, there are about 2800 http://www.wolframalpha.com/input/?i=plot++2800%2F%281%2B6%28e^-%280.05t%29%29+%29++for+t+%3D+400
November 17, 2014

bad link copy
http://www.wolframalpha.com/input/?i=plot++2800%2F%281%2B6%28e^-%280.05t%29%29+%29
November 17, 2014

algebra
If so try: http://www.wolframalpha.com/input/?i=plot++2800%2F%281%2B6%28e^-0.05t%29+%29 when t = 0, e^0 = 1 so 2800/7 when t-->oo 2800/( 1 +6/big) = 2800
November 17, 2014

typo?
Do you mean: P(t) = 2800/(1+6e^-0.05t) ????
November 17, 2014

math
I already gave a link to communative property explanation down below
November 17, 2014

Math
9-5 = 4 along sides for entire length of floor so 4 *16 for sides ends are 16-12 = 4 by 5 = 20 4*16 + 20 = 84
November 17, 2014

math
ah, here we go: http://coolmath.com/prealgebra/06-properties/01-properties-commutative-addition-01.htm
November 17, 2014

math
if 7 cows + 9 cows fill a field then 9 cows + how many cows fill the field?
November 17, 2014

math
make a guess and I will come back and look
November 17, 2014

Math
You are welcome.
November 17, 2014

Math
tulips = t roses = 4 t t + 4 t = 40 5 t = 40 t = 8 4 t = 32
November 17, 2014

calculus
x y = 147 so x = 147/y x + 3 y = a 147/y + 3 y = a da/dy = 0 for max or min = 3 -147/y^2 y^2 = 147/3 = 49 y = 7 x = 147/7 = 21 so x = 21 and y = 7
November 17, 2014

Physics
d = 4 /(.00289 - .000667) = 4/.0022 = 1818 m
November 17, 2014

NO!!!!@
d = 4 /(1/Va -1/Vw)
November 17, 2014

Physics
but all it asked for was d, 1380 meters
November 17, 2014

Physics
you will have to use your equations to find velocity of sound in water Vw and air Va at those temperatures d = Va t so t = d/va d = Vw (t-4) d = Vw (d/Va - 4) 4 Vw = d (Vw/Va -1) d = 4 Vw /(Vw/Va-1) d = 4 /(1/Va -1/Vw)
November 17, 2014

Physics
constant momentum means zero net force. (Newton #1) thrust = drag lift = weight
November 15, 2014

Science Help!
mass is conserved in chemical reactions 22 + 9 - 17.2 = 13.8
November 14, 2014

math
(2+3i)(4+2i) / [ (4-2i)(4+2i) ] ( 8 +16 i - 6)/ (16 + 4) (2 + 16 i)/20
November 14, 2014

science Help 911!!
Sorry, off for a while.
November 14, 2014

science Help 911!!
Oh, my, look at the pictures in your book. D That was the whole thing about those ionic and covalent bonds, the atoms trying to fill their outer (valence) shells by gaining or losing electrons or sharing them.
November 14, 2014

math
x = 3 -1/2y 1/2y = (3-x) 2 y = 1/(3-x) y = 1/(6-2x)
November 14, 2014

Math
16^-3/4 = 1/16^3/4 = 1/2^3 = 1/8 1/x^(24/4) = 1/x^6 = x^-6 so I get (1/8)x^-6
November 14, 2014

science Help 911!!
one is ionic, the other covalent but both are CHEMICAL
November 14, 2014

science Help 911!!
Yes, chemical
November 14, 2014

science Help 911!!
now when the Na gives up an electron, it has more protons than electrons and is a POSITIVE ion when the chlorine grabs that electron to complete its outer shell it has one more electron than proton and is a NEGATIVE ion because electrons are negative. Since positive charges ...
November 14, 2014

science Help 911!!
Protons are like charges - they REPEL each other My grandson is the goalie, no waiting in this matter :)
November 14, 2014

science Help 911!!
The answer is atoms are held to each other in compounds by chemical bonds. That was where chemistry started :) http://www.jiskha.com/display.cgi?id=1289791741
November 14, 2014

college algebra
find zero;s(x-3)(x-sqrt 2)(x+sqrt 2) = 0 (x-3)(x^2-2) = 0 x^3 -3 x^2 -2 x + 6 = 0 so y = f(x) = x^3 -3 x^2 -2 x + 6
November 14, 2014

science Help 911!!
Look at this problem answer at the bottom of the page by A&P: http://www.jiskha.com/display.cgi?id=1289791741
November 14, 2014

science Help 911!!
but what about my grandson's hockey game ?
November 14, 2014

science Help 911!!
sharing electrons is covalent, yes giving up electrons to the other atom would be ionic.
November 14, 2014

Math
27 ^2/3 * t^(4/3 = 9 t^(4/3)
November 14, 2014

MATH
well, go ahead :)
November 14, 2014

math
1 = 10^0 .1 = 10^-1 = 1/10 .01 = 10^-2 = 1/100 .001 = 10^-3 = 1/1000 .0001 = 10^-4 = 1/10000 .00001 = 10^-5 .000001 = 10^-6 .0000001 = 10^-7 .00000001 = 10^-8 note move decimal point 8 spaces to right to get 1 .00000001 * 8.7 = .000000087
November 14, 2014

Pre-Calculus
It is a bit difficult to show you such a graph here. What you want to do is graph those functions in the domain from about (0,-10) to (20,10) and put your discrete points on the graph. Then you can see which function comes close to the points. for example your first function ...
November 14, 2014

algebra
L = w+5 A = L w = (w+5)w = w^2 + 5 w
November 14, 2014

check for typos
If you mean 5/(1-sin) + 5/(1-sin) that is clearly 10/(1-sin) multiply top and bottom by (1+sin) 10(1+sin)/(1-sin^2) which is 10(1+sin)/cos^2 but I suspect that you typed it wrong
November 14, 2014

PHYSICS (please help)
force down on m3 = m3 * g = 29.4 N F = m a 29.4 = (1+2+3) a a = 29.4/6 m/s^2 tension between m1 and m2 = m1 a = 1 a m3 g - Tension up on m3 = m3 a tension between m1 and m2 = m1 a
November 14, 2014

Pre-Calc/Trig
clearly as x --> 0 d ---> about +7/x which is plus oo for x>0 and minus oo for x<0 as x gets very large d --->x^2/3x or x/3 as x gets big negative, d --> x/3 again which is negative the numerator is zero when x = 2 or x = 10 so those are x axis intercepts
November 14, 2014

math
18.5 / (3/8) = 49 1/3 so 49 because it is hard to plant 1/3 bulb 3 * 49 = 147 147 * 0.79 = 116.13 before tax :)
November 14, 2014

physics
Your sin assumption would be correct if your 20 deg boom angle is from vertical, but usually you measure from horizontal.
November 14, 2014

physics
toque = 98,100 * 4.7 * cos 20 = 433,264 N m I think you used sin and not cos and you have a typo anyway, should be 157,695 N m
November 14, 2014

Social studies
Might be able to Google Pakistan radio stations.
November 14, 2014

Social studies (Needs to know Pakistan radio stations
You need someone pretty familiar with Pakistan.
November 14, 2014

Science
Then say that up top :)
November 14, 2014

Biology/medicine
Please give subject instead of Stuck, help. A math teacher can not help much.
November 14, 2014

MATH!!!
P = 2*L + 2*W (1,7) --> 2*1 + 2*7 = 2+14 = 16 (7,6) --> 2*7 + 2*6 = 14 + 12 = 26 etc if you want 12 pick an L, say 4 2*4 + 2*w = 12 4 + w = 6 w = 2 so (4,2)
November 14, 2014

physics
No, it is already at 100, the boiling point You want .020 kg * Heat of Vaporization of water in Joules/ kg so .020 kg * 2.26*10^6 J/kg
November 14, 2014

Science 8 - Check Answers
You are welcome.
November 14, 2014

Science 8 - Check Answers
4. OK, but if I had the choice I would say "mechanical" energy 5. I do not think so. You want a poor conductor for an "insulator". For a resistance you usually use a reasonable conductor but make it thin.
November 14, 2014

history essay please help!
Ok, good luck :) I think if you just want to compare populations you should say: The world population is much larger than it was a hundred years ago due to: The things you mentioned. Do not get into growth or growth rate because that is mathematics of exponential functions.
November 14, 2014

history essay please help!
The population has doubled many, many times, and even right now the world's population is still skyrocketing. ------------------------------- The essay is about growth today versus growth 100 years ago. The population has doubled many times since when? 100 years ago? 1 ...
November 14, 2014

Physics
see: http://www.gocomics.com/tarzan?ref=comics
November 14, 2014

Physics
Fcentripetal = mAc = m v^2/R = m (7.2)^2/8.2 Fgravity = m g = m (9.81) so total force on vine = m ( 9.81 + 7.2^2/8.2) = 10^3 Newtons solve for m Note: Tarzan just swam across the wild river from rock to rock with a vine around his waist and the natives are rebuilding their ...
November 14, 2014

Math
(3/(5/4)) (4/5) = 12/5 * 4/5 = 48/25 which is about 2
November 13, 2014

Math help please!!!!!!
assuming that the origin is your center of dilation, B is correct.
November 13, 2014

Algebra
agree with Steve but most importantly look how he did it. It is not necessary to multiply the whole thing out, just the terms that end up being in x^3
November 13, 2014

maths
today
November 13, 2014

calculus
F' = 10 x^-2 dx - 2 x^-6 dx F = -10x^-1 + (2/5) x^-5 + c when x = 1 , F = 0 0 = -10 + 2/5 + c c = 48/5 F = -10 /x + 2/(5x^5) +48/5
November 12, 2014

Physics
Forget the formulas, think !!!!
November 12, 2014

Physics
I will try crate 1 m = 30 kg F = 100 N 1. impulse = F t = 100 * 3 = 300 Ns yes 2. Force = change in momentum/time and initial momentum = 0 so 100 = change in momentum/3 so change in momentum = 300 kg m/s = Ns (by the way if there is a difference between change of momentum and ...
November 12, 2014

St Ans School
or sketch a number line. You will see that the middle between 75 and 45 is 15 each way. or take the average (75+45)/2
November 12, 2014

Physics
150 v = 4.5 * 10 = 45 v = .3 m/s t to get back = 100/.3 = 333 seconds we have five min which is 300 seconds things do not look good :( Better throw that camera harder.
November 12, 2014

physics
angular momentum I omega does not change. If I decreases, omega increases to keep the product constant (the spinning skater pulling her arms in problem :)
November 11, 2014

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