Friday
December 2, 2016

Posts by Damon

Total # Posts: 28,227

Physics
google centripetal acceleration for example http://formulas.tutorvista.com/physics/centripetal-acceleration-formula.html
November 5, 2016

Math
-40/2 -80/4 100/-5 ....... etc
November 4, 2016

Calculus - Falling Body Problem
hint if h = height d^2h/dt^2 = acceleration = -32 ft/s^2 constant dh/dt = speed up
November 4, 2016

phy
The units of A) are acceleration, m/s^2 , not momentum which is mass * velocity so NO WAY If it reversed direction of velocity without changing sign of momentum then obviously it came back with NEGATIVE MASS ! so NO WAY C) well all right D ) LOL, it was thrown at zero speed ? ...
November 4, 2016

Physics
An object of mass 1.00kg is moving over a horizontal circular path of radius 2.00m, with a speed of 3.00ms^-1. Determine: (a) its centripetal acceleration (b) its kinetic energy (c) its period (d) its angular velocity
November 4, 2016

probability
Draw four trees with branches :) 2 of the 16 are banana with basket 2 of the 16 are AT without horn so 4/16 = 1/4 = .25
November 3, 2016

Physics
F = m a = m v^2/r = 10 so mv^2 = 10 r = 10 Ke = (1/2) mv^2 = 5 Joules
November 3, 2016

Algebra
e^x / (x^3 + 1/x^3) multiply top and bottom by x^3 x^3 e^x / (x^6 + 1)
November 3, 2016

physics
v = Vi + a t 0 = 3 + a t t = -3/a d = Vi t + (1/2) a t^2 15 = 3 t + (1/2) a t^2 15 = 3(-3/a) + (1/2) a 9/a^2 15 = -9/a + 9/2a = -9/2a 30 a = -9 a = -9/30
November 3, 2016

sir damon plz help me or steve
well, maybe V = 50 sin (2pift) and i = I sin (2pift - phi) then di/dt = 2pif I cos (2pift-phi) with your numbers 2 pi f = 200 V = 50 sin 200 t i = 20 sin (200 t-phi) di/dt = 4000cos (200 t - phi) now VL = L di/dt = L*4000 cos(200t-phi) so 4000 L = 30 L = 3/400 Vr = iR =R*20 ...
November 3, 2016

Calc
p = 2w + 2 L L = 50/w so p = 2 w + 2 (50/w) p = 2 ( w+50/w) dp/dw = 0 at min or max = 2 [ 1 - 50/w^2 ] w^2 = 50 w = 5 sqrt 2 then L = 50/[5 sqrt 2 ] = 10 srt 2/2 = 5 sqrt 2 LOL, it is square :)
November 3, 2016

algebra
You are welcome.
November 3, 2016

algebra
1/3 = 2/6 = 4/12 1/2 = 3/6 = 6/12 halfway between 4/12 and 6/12 is 5/12
November 3, 2016

Physics
but, but, it would have been fun :(
November 3, 2016

Maths
compounded three times 5% each time 4630.50 * (1.05)^3 in the second one is it compounded once or twice a year? if once 4 = (1+x)^2 2 = 1+x x = 1.00 so 100% doubles the first year, doubles again the second year.
November 3, 2016

Physics
Ac = v^2/R F = m Ac = m v^2/R but F = mu m g so mu m g = m v^2/R mu = (v^2/R)/g ratio of centripetal acceleration to gravitational acceleration :) by the way on earth g is more like 9.81 m/s^2, not 9.88
November 2, 2016

physics
This is a trick question. (a) Since there is no friction, the potential energy at the TOP (at 5 meters), m g h = 3 * 9.8 * 5 becomes ZERO AT THE BOTTOM if you define ground level as zero potential. Note the potential difference depends only on altitude. The ramp changes ...
November 2, 2016

Math
three plus 63/80 16/80 44/80
November 2, 2016

Math
if far less fun than changing them all to xxx/80 :)
November 2, 2016

Chemistry
1/2 after 10 1/4 after another 10 1/8 after a third 10 so 345/8 In general fraction left = 1/2^n where n is the number of half lives
November 2, 2016

Physics
Fx = 181 cos 20.8 normal force = m g - 181 sin 20.8 friction force =.29(mg-181 sin 20.8) ma= 181cos 20.8-.29(mg-181 sin 20.8) divide by m to get a now you do the second one the same way
November 2, 2016

Physics Urgent!
a = -mu g = -.705*9.8 = -6.91 m/s^2 v = Vi + a t 0 = 28.7 - 6.91 t t = 4.15 seconds to stop d = average speed * 4.15 = 28.7/2 * 4.15 = 59.6 meters he stops in 59.6 meters we stop in 59.6 + .427 * 28.7 meters so we better be .427*28.7 = 12.3 meters behind or we hit him just ...
November 2, 2016

Physics
a = change in v /change in time = (6.7 - 12.1)/4 = -1.35 m/s^2 F = m a = - mu m g so mu = 1.35/9.8 = .138 average speed = (12.1+6.7)/2 = 9.4 9.4*4 = 37.6 meters
November 2, 2016

Math
3 [ .035* 3800 ] = 399
November 2, 2016

Math
2 L + 2 w = 44 so L + w = 22 L w = 120 so L = 120/w 120/w + w = 22 w^2 - 22w + 120 = 0 (w-12)(w-10) = 0 ten by 12 :)
November 2, 2016

math
-4*5 = -20
November 2, 2016

huh
Unless it is a square, there is no unique answer.
November 2, 2016

Math
You are welcome :)
November 2, 2016

Math
3(8/8) + 7 /8 = 24/8+7/8 = 31/8 3 7/8
November 2, 2016

still math
You are welcome.
November 2, 2016

still math
combine like terms 3 apples + 4 grapefruits + 2 apples is 5 apples + 4 grapefruits
November 2, 2016

Calculus
-1*2 + 7*3/4
November 2, 2016

math
100 (3240 -2673) /3240
November 2, 2016

Trigg county
5280 * 2 --------- 500 * 2 10560 ------ 1000 10.560 or 10.56 feet = 1/500 of a mile :)
November 2, 2016

Math
I think you may mean: 12 a - 3 b^2 12*9 - 3 * 4^2 108 - 3 * 16 108 - 48 60
November 2, 2016

statistics
http://davidmlane.com/hyperstat/z_table.html
November 2, 2016

Math7 grade
You are welcome.
November 2, 2016

Math7 grade
15 ft * 2 in/ft = 30 in 18 ft * 2 in/ft = 36 in so area on plan = 30*36 = 1080 in^2 on the real size area = 15*18 = 270 ft^2 well to compare them change in^2 to ft^2 there are 12 in /ft so 144 in^2 per ft^2 so 1080 in^2 *1 ft^2/144 in^2 = 7.5 ft^2 or you could say 30 in = 30/...
November 2, 2016

Calculus
You do not say if the wind is coming FROM NE or going TOWARD NE In navigation, sailing, and flying we usually use the FROM convention and your NE breeze has components taking you 80/sqrt 2 south and 80 /sqrt 2 west However you never know with mathematicians
November 2, 2016

phy
The same before and after of course 1200*10+2000*27
November 2, 2016

Chem
well, you have 3 mol of H2 for every mol of N2 so your reaction is not limited by either so You have the same number of atoms of N2 on left as on right so .823/.885 = .93 of each reacted so .07 of each remains .07 * .885 = .062 Mol of N2 still there and .07 * 2.654 = .186 mol ...
November 2, 2016

Calculus
u = 5 cos 30 v = 5 sin 30 so V = 5 cos 30 i + 5 sin 30 J of course cos 30 = sqrt 3 /2 and sin 30 = 1/2 so V = (5 sqrt 3) /2 i + (5/2) j
November 2, 2016

Calculus
sqrt(36 + 64) = sqrt 100 = 10 so that vector is ten units long. If you divide each component by 10, you will get a vector of length one in that same direction so < -6/10 , -8/10 > or < -3/5 , -4/5 > by the way this is a 3,4,5 right triangle :)
November 2, 2016

physics
(a) m g h = 3 g (5) =15g at top BUT I assume you are choosing it to be ZERO at the bottom (b) (1/2)m v^2 = mgh = 15 g of course (c) v = sqrt (2 g h) v = sqrt(10 g) (c)
November 2, 2016

Math
4^2 /2 - 2^2 + 5 8 - 4 + 5 9
November 2, 2016

Calculus
As far as I know the first one is true, they differ by a constant. yes, true say f = x^2 g = x then F = (1/3) x^3 + C1 G = (1/2) x^2 + C2 integral f g dx = (1/3) x^4 + C forget the constants for now, no need F G = (1/6) x^5 like no way :)
November 2, 2016

Calc
dv/dt = a which is constant so v = c + at c is v when t = 0, v0 so v = v0 + a t dx/dt = v = v0 + a t so x = constant + v0 t + (1/2)at^2 constant is x when t = 0 or s0 x = s0 + v0 t + (1/2)at^2 (but we cheated and took physics so knew that)
November 1, 2016

Geography
g = b+40 b/g =3/7 so b =3g/7 so g = 3g/7 +40 7g/7 = 3g/7 + 40 4 g = 40*7 g = 70 b = 3*70/7 =30
November 1, 2016

physics
F = m a 5890 = (1070+2140) a a = 5890/(1070+2140) then Fjeep = 2140 a
November 1, 2016

PLEASE CHECK OPERATIONS WITH FRACTIONS PART 2
13. Kevin had 3/4 yard of string. He used 1/3 of the string for a school project. How many yards of string did he use for his project? A.5/12*** B.1/3 C.7/12 D.1/4 ============================== 1/3 * 3/4 = 1/4 I do not have time to go through all these but noticed this ...
November 1, 2016

Math
12 +14 = 26 26 * 10 = 260 260/2 = 130
November 1, 2016

Bob
I have answered this three times now.
November 1, 2016

Science
http://www.jiskha.com/display.cgi?id=1478031138
November 1, 2016

Math
1.25 * 12 = 15
November 1, 2016

hellllllpppp
23/63 as I said before 23 is a prime number. This fraction can not be simplified.
November 1, 2016

Science
http://www.jiskha.com/display.cgi?id=1478031138
November 1, 2016

Maths
2005 /4 = 501 1/4 2004/4 = 501 so -7 so 2
November 1, 2016

Physics
first 20 s slope of v = a = 2 m/s^2 v = 0 + 2 t x = (1/2)(2) t^2 at t = 20 v = 40 m/s x = 400 m from t = 20 to t = 50 v = 40 m/s a = 0 at t = 50 v = 40 new a = -40/25 x = 400 + 40(30) = 1600 from t = 50 to t = 75 v = 40 - 40/25(t-50) a = -40/25 x = 1600 +40(t-50) - 20/25(t-50...
November 1, 2016

PHYSICS
omega R = v omega = v/R = 12/1.5
November 1, 2016

Maths
yes
November 1, 2016

Maths
would it be 295,000 or 296,000 is 3 >/= 5 ?
November 1, 2016

Maths
(1.61 + 0.81 + 1.21) /3
November 1, 2016

biology - genetics Mendelian
need biology teacher
November 1, 2016

Maths
5.4 cm * 10 km/cm = 54 km
November 1, 2016

Maths
perimeter = 2*4 + 2*3.5 = 8 + 7 = 15 meters total area = 15 * 2 = 30 m^2 now subtract 2 and 1 = 3 so 27 m^2 27*3 = 81 dollars But not really if you ever did wall paper :) It never comes out like that perfectly, has to be lined up and edged perfectly so needs extra.
November 1, 2016

Math
-12 + n = -35 n = -35 + 12 n = - 23
November 1, 2016

Maths
sum = 180 = 2*90 two
November 1, 2016

math
2*8 = 16 16+5 = 21 so 21/8
November 1, 2016

Maths
10/10 - 7/10 = 3/10 2 Liters? that is 2,000 mL 3/10 (2,000) = 600 mL
November 1, 2016

Maths
1000/200 = 5 5 * 40 = 200
November 1, 2016

Math
7/8 - 3/4 is 7/8 - 6/8 = 1/8
November 1, 2016

math
what can you divide 23 by? Nada ! Prime the end 23/63
November 1, 2016

math
time starting at 2007 t n 0 35250 5 28200 7 ? n = m t + 35250 28200 = m (5) + 35250 5 m = - 7050 m = -1410 so n = -1410 t + 35250 if t = 7 years n = -1410 (7) + 3520
November 1, 2016

geography
Rivers ! Harbors ! Paths through deserts and mountain ranges!
November 1, 2016

science plz correct me
A. I thought I told you, more MASS
November 1, 2016

AP Statistics
I do not know what you did in unit but find mean and median for women and for men for example median women 21 26 26 30 31 33 33 34 34 35 37 38 41 41 41 42 49 61 72 74 80 There are 21 10, median, 10 10 smaller than 37 and 10 bigger median is 37 now do it for men is it higher?
November 1, 2016

science
E = i R 21 = 3 R R = 7 Ohms
November 1, 2016

Science 7
No! Read carefully, more MASS
November 1, 2016

Science 7
G M1 M2 / d^2 bigger mass, same d ---> bigger force
November 1, 2016

Calculus
well, x^2 +y^2 = 49/4 put that back in 2 (49/4)^2 = 49 (x^2-y^2) 49/8 = x^2 - y^2 49/4 = x^2 + y^2 2 x^2 = 3*49/8 well that is two points x values :) you have 2 y values for each x so 4
November 1, 2016

Calculus
find where dy/dx = 0 4 (x^2 + y^2)(2x + 2 y dy/dx) = 49 (2 x - 2 y dy/dx) when dy/dx = 0 4(x^2+y^2)(2x) = 49(2x) x^2+y^2 = 49/4 = r^2 it is a circle center at (0,0) , r = 7/2
November 1, 2016

Pre-algebra
74 is an integer 74/1 Now if you had said 7.4 I would have said 74/10 so still rational
November 1, 2016

Pre-algebra
1/1 2/2 4/2 or 4/1 in fact since every integer is divisible by one every integer is a rational number. You have to get far out to get irrational, like sqrt( 2 ) or pi or e Remember that fractions are generally ratios of whole numbers so rational like 3/273 is rational
November 1, 2016

Science 7
I guess if the switch is closed the bulb is on. yes G M/r^2 but we are assuming comparable radii
November 1, 2016

Math-Check my answer
3 a - 4 </= 5 3 a </= 9 a </= 3 yes
November 1, 2016

math plz help
LOL - I suppose it could be 7.5 but it said the GREATEST common factor well if they were 30 oz, we would not get 15 so it looks like 15 is the biggest that will go into all three 15 --> one ball 30 --> two balls 60 --> four balls
November 1, 2016

Algebra
well, I would multiply both sides by 15 x 15 x (2/15) = 15 x (13/x or 2 x = 15 * 13 x = 7.5 * 13 x = 97. 5 indeed Now some may say just cross multiply well ok 2 x = 15 * 13 immediately. but I do not like the words "cross multiply" despite the fact that they are ...
November 1, 2016

science
No way I am going to just say a heat wave is hot. What answers would you give if we were not around?
November 1, 2016

physics
I wonder if the cabinet is accelerating down call it a ma = mg - T m(9.81-a) = 2390 T - .68 * 193 *9.81 = 193 a or 193 a = 2390 - 1287 a = 5.71 m/s^2 (dangerous) m (9.81-5.71) = 2390 m = 583 kg
November 1, 2016

Chemistry help emergency? (theoretical mass/mol)
You do not have enough of one or the other, limiting the amount of Cu resulting. Use the one you do not have enough of. Your mols of Al must be at least 2/3 the number of mols of CuCl....... If it is less use it. If it is more use the CuCl ... and you will have some Al left over
November 1, 2016

Maths (really hard)
what is length AB? sqrt(4+ 64) = sqrt 68 = 2 sqrt 17 so length AC = sqrt 17 what is slope AC? It is -1/slope AB slope AB = -2/8 = -1/4 so slope AC = 4 now point C (x,y) Oh, wow, problem over go right one from A go up 4 from there what is hypotenuse? LOL sqrt 17 !!!! so x = 1...
November 1, 2016

Maths (done question a but cant do b)
-2 + -3 = -5 -5/2 = -2.5 which is y of C 4 ) 6 = 10 10/5 = 5 which is x of C so C(5, -2.5) now AC dx = 5-4 = 1 dy = -2.5 - -3 = .5 d^2 = 1+.25 now CB dx = 6 -5 = 1 dy = -2 - -2.5 = .5 d^2 = 1 + .25 the same
November 1, 2016

LOL - so what is C (?,?)
Do I have to do part a too ?
November 1, 2016

maths
change in y = 6 - (-3) = 9 change in x = 7 -4 = 3 so d = sqrt (81 + 9) = sqrt (90) = 3 sqrt 10
November 1, 2016

Math
You are welcome.
November 1, 2016

Math
85% = 85/100 = 0.85
November 1, 2016

Calculus
You are welcome.
November 1, 2016

Calculus
Sometimes conventional obscurity is insufficient and extraordinary efforts must be made to confuse the student. One seemingly simple but surprisingly effective technique is to reverse the usual roles of x and y.
November 1, 2016

Calculus
yes it is. Perhaps you are misled by the x being the independent variable instead of y When y = 1 x = 1^3 = 9 (1)^2 + 5 = 1 - 9 + 5 = -3 sure enough now the problem dx/dx = 1 = 3 y^2 dy/dx - 18y dy/dx 1 = (3y^2-18y)dy/dx dy/dx = 1/ (3*1^2 -18*1) dy/dx = 1/(-15) = -1/15 amazing...
November 1, 2016

Science
well, probably there was air and water in it and the air expanded in the heat pushing the water out.
October 31, 2016

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