Thursday
February 11, 2016

Posts by Damon

Total # Posts: 25,219

Math
7*100 + 16*10 + 3 700 + 160 + 3 800 + 60 + 3 863
January 28, 2016

Mathematics
a = (2/3) b + 1/3 use in eqn 2 3 b = 5 [(2/3) b + 1/3 ] - 3 3 b = (10/3)b + 5/3 - 3 9 b = 10 b + 5 - 9 b = 9-5 b = 4 3a = 2(4) +1 = 8+1 a = 3
January 28, 2016

Science
1. yes 2. yes 4. yes 5. yes 6. yes 7. yes 8. yes 9. yes 10. I would say boiling and evaporating since they are really the same. I am not sure you can filter dissolved sugar out of water except perhaps by reverse osmosis
January 28, 2016

Calculus
inverse would be time for a specific population 1+749 e^-.15t = 7500/p 749 e^-0.15 t = (7500-p)/p e^-.015 t = (7500-p)/(749 p) e^.015t = 749 p/(7500-p) .015 t = ln [ 749 p] - ln [7500-p)] t = 66.7 [ln 749 p - ln(7500-p)] we had 10 when t was 0 so check t = 66.7[ ln 7490 - ln ...
January 28, 2016

Pre-calculas
Is the point at the bottom or the top? whichever way you draw it Volume of a cone = (1/3)pi R^2 x where r is the radius of the surface and x is distance from the tip r/x = 9.5/ 16 = .594 so r = .594 x v = (1/3) pi (.594x)^2 x v = .369 x^3 dv/dx = 1.11 x^2 dv/dt = 1.11 x^2 dx/...
January 27, 2016

Math
yes, only one that has angles less than 90 and adds to 180
January 27, 2016

physics
Vi = initial speed up u = constant horizontal speed find t, time in air Vi = 135 sin 18.3 = 39.25 u = 135 cos 18.3 = 128.2 d = u T find T the time in air v = Vi - 9.8 t at top where v = 0 and t=T/2 0 = 39.25 - 9.8 t t = 4.005 s so T = 2 t = 8.01 seconds in the air d = u t = ...
January 27, 2016

Math
1700 * 100 / 8500 = 20 %
January 27, 2016

Algebra
n n+2 n+4 n+6 ---- 4 n + 12 = 80 4 n = 68 n = 17 17, 19 ,21 ,23
January 27, 2016

Math
make a sketch !!! a diagonal would for example be from B to D change in x = 1 - -1 = 2 change in y = -3 - +3 = -6 sqrt (2^2+6^2) = sqrt 40 = 2 sqrt 10
January 27, 2016

Algebra
n + n+2 = 1306 2 n = 1304 n = 652 n+2 = 654
January 27, 2016

Math
Agree, only one with all less than 90 and adds to 180
January 27, 2016

Math
Remember 40% LOSS is 60% LEFT :)
January 27, 2016

Math
.6 * 300 = 180 left after 40% trim .4 * 180 = 72 left to eat
January 27, 2016

math
You are welcome.
January 27, 2016

math
1.03^10 = 1.344 times 19900 = 26744 You got it
January 27, 2016

Algebra
n + n+1 + n+2 3 n + 3 = 930 3 n = 927 n = 309 and 310 and 311
January 27, 2016

English
because gh is two consonants http://www.howtospell.co.uk/doubling-up-rule
January 27, 2016

Physical Science
Yes, assuming electromagnetic (not water or sound or whatever)
January 27, 2016

Math
(200/5000)100 = 20000/5000 = 20/5 = 4%
January 27, 2016

Algebra
n + n + 1 = 529 2 n = 528 n = 264 n+1 = 265 add them to check
January 27, 2016

math
total rise = 112 - 149 = -37
January 27, 2016

math
you have 12 girls put one girl and 3 boys in each of 12 groups
January 27, 2016

Math
4n+2 = 14 ? 4 n = 12 n=3 2n = 6 2n+2 = 8
January 27, 2016

physics
Rx = 15 cos 250 = -5.13 m Ry = 15 sin 250 = -14.1 m ============================ new one is - 2 times old 250 - 180 = 70 degrees is opposite Rx = 30 cos 70 = 10.3 Ry = 30 sin 70 = 28.2 R^2 = (Rx^2+Ry)^2 = 30^2 (sin^2+cos^2) = 30^2 so it is 30 of course direction is the old ...
January 27, 2016

physics
I rounded .115 to .12 in part a (as instructed :) If they use 4.9 (1.15)^2 they would get 6.48 which rounds to 6.5
January 27, 2016

physics
t = distance/speed = .115 * 10^-6 seconds which is 1.2 *10^-7 seconds h = (1/2) g t^2 h = 4.9 (1.44)(10^-14) h = 7.1 * 10^-14 meters
January 27, 2016

Physics
F = k Q1Q2/r^2 here r = .115 so let (k/r^2) = c constant Fnorth = -(3.17*3.96*10^-12)c Feast = +(3.17*5.03*10^-12)c magnitude = sqrt (Fx^2 + Fy ^2)
January 27, 2016

Physical Science
solids are harder to squish. look here: https://www.khanacademy.org/science/physics/mechanical-waves-and-sound/sound-topic/v/relative-speed-of-sound-in-solids-liquids-and-gases
January 27, 2016

physics
C runs 4.09 t meters C runs 4.28 t meters 4.28 t - 4.09 t = 94
January 27, 2016

les/math
original box x (2x)(5x) = 80 x^3 = 8 so x = 2 2x = 4 5x = 10 now new box 4 * 6 * 12 = 288 cm^3 increase = 288 - 80 = 208
January 27, 2016

physics
1490 + 25,000 tan 2.6 = h h = 1490 + 1135 h = 2625 meters
January 27, 2016

Math
Yes, could have any old value, including the same.
January 27, 2016

math
h * 6 = 102 h = 102/6 = 17 17 what though? inches,feet meters? decimeters? elbows? miles? kilometers? Is Rita a doll or a dinosaur?
January 27, 2016

Physics
- (1.2*10^4 )(1.6*10^-19) = 1.9 *10^-15 C = 1.9 * 10^-9 µC
January 27, 2016

math
a taxi ride costs 5 dollars to start the meter and then 4 dollars per mile. I have 37 dollars. How far can I ride? ( I guess I will not leave a tip :( 4 x = 37 - 5 4 x = 32 x = 8 miles
January 27, 2016

Math
ln(2x+3)^4 = 11 e^ln(2x+3)^4 = (2x+3)^4 = e^11 (2x+3) = (e^11)^.25 = e^2.75 = 15.64 2x = 12.64 x = 6.32
January 27, 2016

Math
Hey Rita, read what you wrote. We have no idea what your scale ratio is hint ratio of areas = ratio of lengths^2 2/1 in length is 4/1 in area (and 8/1 in volume)
January 27, 2016

history .
I agree with A for both. However I am not a history teacher.
January 27, 2016

Math
Log2(x)+log2(x-3)=2 2^[Log2(x)+log2(x-3)] =2^2 2^log2(x^2-3x) = 2^2 (x^2-3x) = 4 x^2 - 3 x - 4 = 0 (x-4)(x+1) = 0 x = 4 or x = -1
January 27, 2016

Math
2log6(4x)=0 log6 (16 x^2) = 0 6^log6 (16 x^2) = 16x^2 = 6^0 = 1 so x^2 = 1/16 x = 1/4 normally I would say also -1/4 but try to take the log of -1 :)
January 27, 2016

Physical Science
No, I disagree. It has to transfer heat to something colder, like a vat of liquid air or the surface of Lake Superior in February.
January 27, 2016

Functions 11
well b^2-4ac = 81-24k if that is positive, two real roots if it is zero, you have one root twice (the parabola just bounces off the x axis at x = -b/2a) if it is negative there are no REAL roots (although there are two complex conjugate solutions)
January 27, 2016

Chemistry 101
.785 v = 2 v = (2/.785) cm^3
January 27, 2016

Physics
Newtons force = F = .1 kg * 9.81 x = 0.10 meter k = F/x = 9.81 N/m
January 27, 2016

Math
use -4y for x in the second equation -4 y + 5 y = 2 so y = 2 then x = -4(2) = -8 (-8 , 2)
January 27, 2016

Physics
I took this in 1955 and do not need practice. If you get stuck I will help but I will not do all the problems for you. By the way in Naval Architecture we have a term called "tons per inch" for small changes in draft. It proportional to rho g * area of water line ...
January 27, 2016

Physics
(1000 kg/m^3 * volume) - 1.8 kg
January 27, 2016

Physics
You mean 1.8 * 9.81 N
January 27, 2016

PHYSICS
weight component down slope = m g sin A = force component up slope = F 50 (1/2) = 25 N = F
January 27, 2016

Physics
The kinetic energy alone is (1/2) m v^2 = 212 * 10^12 so there is a typo somewhere either in the problem statement or in the answer.
January 27, 2016

Math
Matt had x May had 3x 4 x - 50 = 70 4 x = 120 x = 30 ======================= check Matt 30 May 3*30 = 90 sum = 120 120 = 50+70
January 27, 2016

math
tan 30 = h/a tan T = h/2a tan T = (1/2) tan 30 T = 8.21 degrees
January 27, 2016

W Hist
semiconductors sitting around staring at screens no horse messes stinking up the city streets
January 26, 2016

Math
6 * 3 * 2 = 6 * 6 = 36 ft^3
January 26, 2016

math
2*2*2*2*2*2
January 26, 2016

Physics
vertical problem: Vi = 68 sin 25 = 28.7 m/s h = Vi t -4.9 t^2 h = 28.7 t - 4.9 t^2 horizontal problem: u = 68 cos 25 = 61.6 m/s t = 50/61.6 = .811 s so h = 28.7(.811) - 4.9(.811^2)
January 26, 2016

Pre Algebra
-1 11/16 + 4 1/6 = - 27/16 + 25/6 sure enough = -81/48 + 200/48 agree = 119/48 = 2 23/48 yes ============================ NO! -1 33/48 + 4 8/48 = 3 -25/48 = 2 + 48/48 -25/48 = 2 + 23/48
January 26, 2016

?
Please proof read initially at rest maybe? 12 what? /s^2 meters, feet ? 205 what? seconds, meters ? feet? miles? after 205 what again? 12 m/s^2 for how long ? Is this after the first question using that final for this initial velocity?
January 26, 2016

math
Yours is much better. I got off on that both queens tack :)
January 26, 2016

math
Go with jolly rancher !
January 26, 2016

whoops
what I gave you was for a specific rank, like two queens multiply by 13 because there are 13 ranks
January 26, 2016

math
4/52 * 3/51
January 26, 2016

Science
storage space, closet ?
January 26, 2016

typo?
You need to specify a time before the encounter
January 26, 2016

History
Well, I suppose D, but I do not think communes were that large as a rule.
January 26, 2016

math
No, you can not copy and paste to this site.
January 26, 2016

Math
3 times as many cookies takes 3 times as many cups of sugar so 6 cups 2 cups/ 2 dozen = 6 cups/6 dozen
January 26, 2016

physics
m v^2/r 2500 (25)/50 = 1250 Newtons
January 26, 2016

Physics
dw/dt = -10 - 4.42 t so w = -10 t - 2.21 t^2 + constant find constant at t = 0 71.6 = -10(0) - 2.21(0)^2 + c so c = 71.6 w = 71.6 - 10 t - 2.21 t^2 put in t = 2.73 Now the angle dTheta/dt = w = 71.6-10 t -2.21 t^2 so Theta = 71.6 t - 5 t^2 - (2.21/3)t^3
January 26, 2016

Physical sciences
Fx = 30 cos 60 - 40 cos 60 Fy = 30 sin 60 + 40 sin 60 F = sqrt (Fx^2 + Fy^2) Tan theta = Fy/Fx Note - Theta is in quadrant 2 because 40>30 Use 180 - the magnitude of the angle
January 26, 2016

Physics
from the plus plate toward the negative plate Remember that if you integrate along them you get the voltage difference.
January 26, 2016

Physics
You do not say what the moment of inertia of the Merry Go Round is. I will call it I 39.4 revs/min (2 pi rad/rev)(1 min/60s) = 4.13 radians /s = W1 omega of John = v/r = 6.36/3.21 = 1.98 rad/s Initial angular momentum = I (4.13) + 48.4(3.21)^2 (1.98) Final I = I + 48.4(3.21)^2...
January 26, 2016

Physics
You need how far it rolled down the hill to get initial speed v = w r where w is omega, the angular velocity kinetic energy = m g h = (1/2)I w^2 + (1/2) mv^2 = (1/2)(2/3)mr^2v^2/r^2 + (1/2)mv^2 =(mv^2/2)[2/3 + 1] = (5/3) (mv^2/2) so g h = (5/3)(v^2/2) solve for v, initial ...
January 26, 2016

math
If those are matrices, no they do not necessarily commute
January 26, 2016

Physics
Your equations seem to indicate that the 70 degrees is with the FLOOR, not the Wall, which makes more sense) First, force up = force down so force up at floor = 160 Call friction force at floor Fw It is equal and opposite to horizontal force at top Now moments about ladder at ...
January 26, 2016

physics
How amusing - you happened upon a Naval Architect. increased volume of ship in the water = Area * .025 meters mass of water displaced = density of seawater * that volume density of seawater is about 1029 kg/m^3 so mass of water displaced = 1029 * .025 * A Buoyancy force due to...
January 25, 2016

physics
You mean (4/3) pi r^3 r = 0.25 meter V = .0654 meters^2 mass of water displaced-mass of foam = (1000-300)(.0654) = 45.8 kg
January 25, 2016

physics
rho fresh = 1000 kg/m^2 rho salt = 1029 kg/m^3 approx submerged draft = d vol of block = .1*.1*.1 = .001 m^3 mass of block = 700*.001 = .7 kg volume of fresh water displaced must have mass = .7 kg so .1 * .1 * d * 1000 = .7 kg d = .07 m = 7 cm so freeboard above water = 3 cm ...
January 25, 2016

Physical Science
h = 4.9 t^2 h= 4.9(1.16)^2 h = 6.19 m
January 25, 2016

physics
assume salt water density = 1029 kg/m^3 and g = 9.81 m/s^2 mass in salt water = 1029*.8*60 = 1000 * d * 60 d = .8 (1029/1000) = .8232 m
January 25, 2016

History
Knowing nothing of the subject all I can do is give you a link: http://www.geocities.ws/krysstravel/writing_kanarda.html
January 25, 2016

math
7 = 1+6 2+5 3+4 if greater than 40 and less than 50, has to start with 4 impossible to be an even number 43
January 25, 2016

math
but if being strict about significant figures you only have two 5.1 * 10^6
January 25, 2016

Calc help!
What you typed does not make sense. Perhaps you mean: [ x(x+3) - (x+1)(x-3)] / (x^2-9) ??? [ x^2 + 3x - x^2 +2 x + 3 ] /(x^2-9) (5x+3)/(x^2-9)
January 25, 2016

physics
None, no motion in the direction of the force.
January 25, 2016

I did this already
http://www.jiskha.com/display.cgi?id=1453734257
January 25, 2016

Math
7 in ( 5 miles/1 in) = 35 miles
January 25, 2016

Math
same way as the one above (15 mi)
January 25, 2016

Math
yes
January 25, 2016

Math
24 + 36 + 24 + 36
January 25, 2016

Physics
99.5-.7 = 98.8 so Reading C = Cr = .7 +(98.8/100) C if Cr = 30 30 = .7 + .988 C C = 29.7 if the same C = .7 + .988 C .012 C = .7 C = 58.3 degrees C or Cr
January 25, 2016

Math
I assume you mean a = 6.25 m/s^2 Please proof read what you type. v = a t = 6.25 m/s^2 * 7 s = 43.75 m/s Now parachute, a = - 2.5 m/s^2 and Vi = 43.75 m/s v = Vi + a t 0 = 43.75 - 2.5 t t = 17.5 seconds
January 25, 2016

math
30 km (1 hour/225 km) = .1333333... = (.1 + 1/30) hours .1 hours = .1*60 minutes = 6 minutes (1/30) hours (60 min/hour) =2 minutes 6 + 2 = 8 minutes
January 25, 2016

math
70 km/h * 1000 m/km * 1 h/3600 s = 19.44 m/s so 50 km/h = 13.89 m/s a = change in v/change in t = (13.89 - 19.44)/5 = - 1.11 m/s^2
January 25, 2016

Algebra
well, halfway between x axis intercepts is x = 12/2 = 6 so that is where the vertex must be y - b = (x-6)^2 -5 - b = (-7)^2 = 49 b = -54 y = (x-6)^2 - 54 y = x^2 - 12 x + 36 - 54 y = x^2 - 12 x - 18 ===================== check: x^2 - 12 x = y+18 x^2 - 12 x + 36 = y+ 54 (x-6)^2...
January 25, 2016

math
The top seems to be an arithmetic sequence and the bottom a geometric sequence, but I can not get that ratio to converge as i --->oo
January 25, 2016

maths
6 n + 4/n = 14 ??? 6 n^2 + 4 = 14 n 6 n^2 - 14 n + 4 = 0 3 n^2 - 7 n + 2 = 0 (3n-1)(n-2)= 0 n = 1/3 or 2 which do you think? Hint - try 2 then try 1/3 :)
January 25, 2016

Physics
work accomplished = 300*30 = 9,000 J applied work = 9,000 + 2,000 = 11,000 Joules efficiency = 100 * work accomplished/work applied = (9/11)100 = 81.8 % force applied = (300/6)/.818 = 61.1 N assuming that the 6 in your question refers to mechanical advantage
January 24, 2016

Algebra
Yes, sure :) BUT you did not need to ask because to be sure just put it back in 2 (3) + 3 (2) = ??? maybe 12 6 + 6 = YES
January 24, 2016

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