Saturday
November 22, 2014

Posts by Damon


Total # Posts: 19,402

Algebra
first 10,000 for 3 years 10,000 (1.10)^3 then second year deposit 10,000 (1.10)^2 then 10,000 (1.10) or 10,000 (1.1^3 + 1.1^2 + 1.1)
November 21, 2014

Physics
You are welcome.
November 21, 2014

Physics
I w before = I w after by conservation of angular momentum 3.1 * 8 - 10.2 * I = -2.6 (3.1+I)
November 21, 2014

ET1210- Dc/Ac Circuits
p = V i but i = V/r so p = V^2/R and thus R = V^2/p
November 21, 2014

ET1210-Dc/Ac Circuits
the voltage drops equally through each resistor if in series (same current through each and V=iR) so V/number
November 21, 2014

Math
I do not know. Make sure you have no typos. I think it was meant to be easier.
November 21, 2014

Math
81 = 3^4 so 3^4x = 64 27 = 3^3 so we want 3^(3x+3) 3^4x = 2^6 4x log 3 = 6 log 2 x = 6 log2 /4 log 3 = 1.5 log2/log3 = whatever, calculator so y = 3^(3x+3) log y = (3x+3) log 3 find log y take 10^log y = y
November 21, 2014

Physics
it has not only (1/2) m v^2 but also (1/2) I w^2 where w = angular velocity if it does not slip then w = v/r I = (2/3) m r^2 for thin spherical shell so ke = (1/2) m v^2 + (1/2) m (2/3) r^2 v^2/r^2 mgh = (1/2) m ( v^2 + 2/3 v^2) h = (1/2g) (5/3) (3.83)^2
November 21, 2014

science
Density is mass/unit volume Inertia is resistance to change in motion mass is a scalar measure of how many neutrons and protons you have degrees is either a measure of temperature or angle or something you get when you graduate
November 21, 2014

Math
a (2)^r = 1 so a = 1/2^r a (32)^r = 4 but 32 = 2^5 a (2)^5r = 4 2^5r / 2^r = 4 2^4r = 4 so 4 r = 2 r = 1/2 check a = 1/sqrt 2 a sqrt(32) = sqrt 32/sqrt 2 = 4 sqrt 2/sqrt 2 = 4 sure enough
November 21, 2014

Math - makes no sense
You either have a typo or your text was written in some other universe. r ? what r? from your first constraint a = 1/4 that does not work for your second constraint
November 21, 2014

Algebra Help please!
No, do P2 now P2 = 6,000 (1.03)^16 then find P2 -P1
November 21, 2014

s.s
cold and hungry committed to General Washington and the cause of independence
November 21, 2014

Physics
20 radians = (1/2)alpha t^2 20 = (a/2) (8.7)^2 a = 40/8.7^2 = .528 v = a t = .528 * 8.7 = 4.60 rad/s yes Ac = v^2/r = omega^2 r = 8.7^2 (.25)
November 21, 2014

algebra 2
6 x^2 - x - 1 = 0 x = {1 +/- sqrt (1 +24) } /12 (1 +/-5) /12 1/2 or -1/3
November 21, 2014

science
water is about 1000 kg/m^3 we have 140 m^3 of water so 140,000 kg of water the force of gravity on that is 9.81 * 140,000 = 1,373,400 Newton's third law says the bottom of the pool has to push up with that same force 1,373,400 Newtons pressure = force/area = 1,373,400/(10*...
November 21, 2014

Math
4/3 = 8/6 7/2 = 21/6
November 21, 2014

Physics
It goes up, then down for 1.05 s do the vertical problem Hi = 2 final h = 0 h = Hi + Vi t - 4.9 t^2 0 = 2 + 1.05 Vi - 4.9 (1.05)^2 -2 + 5.4 = 1.05 Vi Vi = 3.24 m/s initial speed up Now the horizontal problem max speed * sin 10 = 3.24 so speed = 18.7 m/s so u = 18.7 cos 10 = 18...
November 21, 2014

Math
interest = 5 * 10,000 * .07 = 3500 interest = 10,000 * 1.06^5 - 10,000 = 3382.26 subtract
November 21, 2014

Physics
well, then you have your answer F = (1/2) 217 (.625)^2 / .195
November 21, 2014

Physics
I = (1/2)m r^2 F (.195) = I alpha since you did not say what the angular acceleration alpha is, I can not do anything more for you
November 21, 2014

physics
impulse = change in momentum = 9*11 + 9*8 kg m/s
November 21, 2014

Chemistry
H2O = 18 g/mol, 16 of which is O so we have in the water (16/18)(10) = 8.89 kg of O that is 8890 grams or 556 mols of O or 278 mols of O2 in the water how many mols of O2 did we end up with in the air T = 273+25 = 298 do P V = n r T, solve for n or know that 1 mol is 22.4 ...
November 21, 2014

physics
.001 * .065 Nm
November 21, 2014

mixture problems
fat = f .45 f + .03 (500) = .05 (500+f) or .40 f = .02(500)
November 21, 2014

Algebra
25 x = y - 500 so x = (1/25)y - 20 y is already solved for
November 21, 2014

Math Help!!!
x = xi + delta x -2+1 = -1 y = yi + delta y -5+3 = -2 (-1,-2)
November 21, 2014

Math Help!!!
5 - no idea 8 - no idea 7 - NO - y is the same, x changes sign so (-8,-10) the first on the list
November 21, 2014

physics
by conservation of momentum 2.8 * speed of rifle back = .00984*726 solve for speed of rifle back, Vr Ke = (1/2)(2.8)(Vr)^2 + (1/2)(.00984)(726)^2
November 21, 2014

phisics
vertical problem first Vi = 551 sin 12 v = Vi - 9.8 t v = 0 at top so t = Vi/9.8 at top total time in air = 2 t = Vi/4.9 now horizontal: u = 551 cos 12 distance = u (Vi/4.9)
November 21, 2014

Math
5 times Greg's age is 55, 5 G = 55 so Gregg's age is 55/5 or G = 55/5 which is 11 11 + 11 + 11 + 11 + 11 = 55
November 21, 2014

math
do it this way (distributive property of multipication): = -q(q^2-2) + 3(q^2-2) then combine like terms or use FOIL if you happen to know the system. It is really the same thing.
November 21, 2014

math
-1 (p+5)(p-5) in general a^2-b^2 = (a+b)(a-b) so this is -1(p^2-25) which is 25-p^2 or use distributive property as I did in your other problem
November 21, 2014

Math
You left t out ! max at 15 min min at 15+14 = 29 so 14 min from sin = +1 to sin = -1 that is half a period so T = 28 min 2pi t/T = 2 pi at t=T we disagree about all this so pi t/14 is 2 pi when t = T = 28 range from max to min = 2 A = 125-99 = 26 so A = 13 (check with you :) ...
November 21, 2014

Physics
I * omega = the same I gets smaller so omega gets bigger
November 21, 2014

math
v+c=23 v-c=11 ========add 2 v = 34 v = 17 mph
November 21, 2014

physics
a = -7 miles/s^2 I assume you mean but your units look screwy. Perhaps you mean -7 miles per hour/second and I will do that alternative at the end but please read what you wrote in the future before posting. Vi = 40/3600 miles/second v = Vi - 7 t 0 = 40/3600 - 7 t t = .0016 ...
November 20, 2014

math 3
z = (x-mean)/sigma so x = mean + z*sigma 1.25*7 = 8.75 cents 1.25 + .0875 = $1.34
November 20, 2014

algebra
I need 2 mol of H2SO4 so I need 2/10.01 dm^3 of concentrate = .1998 dm^3 of concentrate
November 20, 2014

physics
.045 kg / (25 *10^-6 m^3) = 1800 kg/m^3 1.8 times density of water ? Are you sure data is correct? 25 cm^3 of water has mass of 25 grams
November 20, 2014

math
210 = (h+3) (L +2) = h L + 3 L + 2 h + 6 or h L + 3 L + 2 h = 204 L(h+3) = 204-2h L = (204-2h)/(h+3) A = L h A = h(204-2h)/(h+3) for max dA/dh = 0 = h[(h+3)(-2) -204+2h]/(h+3)^2 +(204-2h)/(h+3) =h[-2h-6-204+2h]/(h+3)^2 +(204-2h)/(h+3) =-210 h/(h+3)^2 + (204-h)(h+3)/(h+3)^2 = ...
November 20, 2014

physics - need radius
need radius of wire, not just current R = V/i = .0320/1.35 = .0237 Ohms = resistivity * Length/area so resistivity = .0237 * pi r^2 /2.8 table of conductivity and resistivity here http://hyperphysics.phy-astr.gsu.edu/hbase/tables/rstiv.html
November 20, 2014

math
y = k sqrt x 6 = k (2) k = 3 y = 3 sqt x y = 3 (5) y = 15
November 20, 2014

Math
17,000 + 3 $/gal * (1/22) gal/mi * Mi = 23,000 + 3 * (1/50) * Mi
November 20, 2014

Algebra2
log2 [(x+8)/5] = 4 (x+8)/5 = 2^4 = 16 x+8 = 80 x = 72
November 20, 2014

math please help
no, see my reply below.
November 20, 2014

thermodynamics
(1/2)m v^2 = 625(1600) Joules divide by 1000 for kJ that is also the work to stop it in kJ
November 20, 2014

math thanks for your help
3 (-2)^3 +5(-2) - 6 every term is negative for x = -3 so no way
November 20, 2014

science
P V = n R T same pressure ? V/T = n R/P = consatnt V1/T1 = V2/T2 6/(2T2) = V2/T2 V2 = 3 in^3
November 18, 2014

geometric progression
a , ar , ar^2 , ar^3 , ar^(n-1) ar^2 = 10 ar^5 = 80 ar^5 / ar^2 = 8 r^3 = 8 r = 2 ====================================== now you do the second one.
November 18, 2014

physics
d = (1/2)(9.8)t^2 10 = 4.9 t^2 t = 1.43 seconds falling v = a t v = 9.8 (1.43) = 14 m/s , yes right Your way is fine. I just cheated to get it faster.
November 18, 2014

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

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