Thursday
April 24, 2014

Posts by Damon


Total # Posts: 16,220

7grade math
I did it in the first line above: 6.75 (25/.75) = 225 miles

7grade math
6.75 (25/.75) = 225 miles You could have guessed which answer was right by doing 8 * 25 = 200 in your head. It is clearly not going to be less than 30 miles :)

physics
.92 * 97 = 89.24 97* 1000/3600 = 26.94 m/s 89.24 *1000/3600 = 24.79 m/s a = change in velocity/change in time how long to reach plate Vaverage = (26.94+24.79)/2 = 25.87 m/s so time to plate = 13/25.87 = .503 s so a = (24.79-26.94)/.503 = 4.27m/s^2 F = m a = .29(4.27) =1.24 N

Intermediate Algebra
Look at any of those examples down below. for example: http://www.jiskha.com/display.cgi?id=1294619397

Math
3 a + p = 10 o 6 o + a = p write as 3 a + 18 o = 3 p so now 3 a + p = 10 o 3 a + 18 o = 3 p ------------------subtract p - 18 o = 10 o - 3 p 4 p = 8 0 1 p = 2 o so two oranges balance a pineapple

physical science
F = m g = G M m/R^2 10 * R ---> 1/100 90 * m ----> 90 9.81 * 90/100 = 8.83 m/s^2

physics
NO WORK IS DONE TO MOVE HORizontaly !!!!!! there is no horizontal forCE !!! Do not be fooled !!! m g h = 1 * 9.81 * .51 = 5.00 Joules

Math
yes, 80

Calculus
now the hard way is v = Vi + a t 0 = 72 + a t a = -72/t x = Vi t + .5 a t^2 1/9 = 72 t + .5 (-72/t) (t^2) 1/9 = 72 t - .5(72 t) or like we said before 1/9 = (72/2) t

Calculus
LOL there is a hard way and an easy way the easy way is to know that during constant acceleration the average speed is the average of the beginning and end speeds average speed = 72/2 = 36 mph speed * time = distance 36 * time = 1/9 time = 1 hour/(9*36) 1 hour = 3600 seconds s...

Math
16 = 2*2*2*2 20 = 2*2*5 we need 4 twos and a five 16*5 = 80

Math
12 = 2*2*3 15 = 3 * 5 so we need two 2s a 3 and a 5 2*2*3*5 = 60

Math
smallest (or least I suppose :) usually it is called the least common multiple, or used to be.

Calculus
height of rectangle = z width of rectangle = b = base of triangle height of triangle = h length of side of triangle = sqrt[h^2+(.5b)^2] perimeter = p = 2 z + b + 2sqrt(h^2 +.25b^2) area = A = z b + (b/2) h = 200 yuuck

Ficonacci puzzles
1 1 2 3 5 8 13 21 34 ... take 2 3 5 -->10 , 9 take 3 5 8 ---> 24 , 25 take 5 8 13 ---> 65 , 64 take 8 13 21 --> 168 , 169 see a pattern ?

Physical science
Well, 0 Newtons gives 0 frictional force

calc
9 dy/dx = x^2 y^2 9 dy/y^2 = x^2 dx -9 / y = (1/3) x^3 + c when x = 3, y = 1 -9/1 = (1/3)(27) + c -9 = 9 + c c = -18 so -9/y = (1/3) x^3 + c if x = 3 * 3^(1/3) = 3^(4/3) then x^3 = 3^4 so -9/y = (1/3)* 3 * 3^3 - 18 -9/y = 27 - 18 = 9 -1/y = 1 y = -1

Maths
(1/9) sqrt 3 * sqrt 27 ? note 27 = 3^3 so sqrt 27 = 3^1.5 3^-2 * 3^.5 * 3^(1.5) = 3^-2 * 3^+2 = 3^0 = 1

pre-calculas
well, this one is different anyway -2 x^2 + 6 x + 5 = y find zeros x^2 - 3 y - 2.5 - -y/2 x^2 - 3 y = -y/2 + 5/2 x^2 -3 y + 9/4 = -2 y/4 + 10 y/4 + 9/4 (x- 3/2)^2 = -1/2 (y -19/2) when y = 0 (x-3/2)^2 = 19/4 so x = 3/2 +/- 1/2 sqrt 19 check with quad eqn x = [ -6 +/- sqrt (36 ...

pre-calculas
-(x+3)/(x-3)+(12x+4)/(x-3)(x+3) -2x/(x+3) LCD = (x+3)(x-3) which is (x^2-9) so -(x+3)(x+3)/LCD +(12x+4)/LCD- 2x(x-3)/LCD -x^2 - 6x - 9 + 12x + 4 -2x^2 + 6 x all over LCD (-3 x^2 + 12 x -5)/(x^2-9) check my arithmetic

MORTGAGE
128,000 * .8 = 102,400 principal p pmt = p [r/{ 1 -(1+r)^-n} ] n = 30 * 12 = 360 r = .085/12 = .00708333 1 + r = 1.00708333 (1 + r)^-360 = .07878669 1 - (1+r)^-360 = .9212133 .08 / .9212133 = .007689 times principal = $787.37

pre-calculas
multiply top and bottom by (x-5)(x+5) which is (x^2-25) x^2 - 9 x - 10 = (x-10)(x+1) by the way

physics
F = .0566 N still m = .733 a = F/m = .0772 1.44 = .5 (.0772) t^2 t = 6.11 s

Physics
We need to know its mass. Rearth = 6.380*10^6 meters Rorbit = 12.380*10^6 meters gain in potential energy + kinetic energy Potential: +G M m/rearth - G M m/rorbit = gain in potential energy Kinetic G M m/rorbit^2 = m V^2/rorbit V^2 = G M/rorbit Ke = (1/2) m V^2 add potential a...

math
LCD is 48 tuesday 14/48 wed 11/48 thurs 9/48 fri 6/48 total so far = 40/48 a) (9/48)100 = 18.75 % b) 48/48 - 40/48 = 8/48 = 1/6 c) (7/24)900 = 262.5 km

Probability
http://www.jiskha.com/display.cgi?id=1392506096

Probability
That is the way I listed them in my reply to you, but the column you use for each does not matter. In other words it does not matter what order you toss them, just toss each of them once. I headed the first column p the second n the third d

Physics
speed north = 30 - 130 sin 30 = -35 speed west = 130 cos 30 = 113 tan angle south of west = 35/113 so angle south of west = 17.2 deg so 270 - 17.2 = 253 on the compass rose

Physics
sine of slope angle = .195/1.36 = .143 angle = 8.24 degrees cos slope angle = .99 weight = 1.1 * 9.81 = 10.8 N component of weight down slope=10.8(.143) = 1.54 N a = F/m = 1.54 / 1.1 = 1.40 m/s^2 d = (1/2) a t^2 1.36 = (1/2)(1.40) t^2 t = 1.39 seconds

Calculus
dy/dx = slope = 1 - x/250 y = m x + 20 at tangent point y = (1-x/250) x + 20 = x - x^2/500 solve that for x

Physics Help
You forgot the weight weight = m g = 5(9.81) = 49 N so 100 N up, 49 down net force = 51 N up a = F/m 51/5 = 10.2 m/s^2

Math help
2 a - 1 b = 1 2 a + 6 b = 8 (multiplied eqn 2 by 2) -------------- subtract -7 b = -7 b = 1 then a = 1 ================================= -1 x + 1 y = 2 +2 x + 1 y = 8 ------------------subtract -3 x = -6 x = 2 then y = 4

Math: Probablity
p n d H H H H H T H T H H T T T H H T H T T T H T T T C two heads ---> 3 d P(HHT) = 1/8 e 3/8 f 4/8 = 1/2 g 2/8 = 1/4 h 6/8 = 3/4 i 1/8 j 1 k zero, not in set

RE: Physics
Sorry, sin not cos opposite / hypotenuse = sin 8.60 degrees

physical
m (4 m/s) = 600 kg m/s m = 150 kg

physical
original momentum in x direction = .4*3 - .8*2 = 1.2 -1.6 = -0.4 kg m/s so moves to left if first car was moving right final momentum in x direction = (1.2)v final momentum = original momentum (first law) 1.2 v = -0.4 v = - 1/3 meter/second

Differential Equations
(2y -x) dy = y dx 2 y dy - x dy = y dx 2 y dy = x dy + y dx y^2 = x y + c when x = 0 y^2 = c = 1 y^2 = x y + 1

Physics
cos (angle) = .178/1.19

college math
6 x^3 + 27 x^2 - 15 x ?? It is a cubic polynomial with one root at x = 0 and use the quadratic equation to find the other two.

Astronomy
because it is just barely above the horizon in the direction of the sun just as the sun set. See the reference I just gave you: http://www.cfa.harvard.edu/pao/skyreport/solar_system.html

Astronmy
Just about between us and the sun see http://www.cfa.harvard.edu/pao/skyreport/solar_system.html

Differential Equations, Matrices
cos45 -sin45 sin45 cos45 is 1/sqrt2 -1/sqrt 2 1/sqrt 2 1/sqrt 2 x' = x/sqrt2 - y/sqrt2 y' = x/sqrt2 + y/sqrt2 so x/sqrt2 + y/sqrt2 =3(x^2/2-2xy/2+y^2/2) +2 original vertex at (0,2) x' = 0 - 2/sqrt2 y' = 0 + 2/sqrt2 so (-sqrt 2 , sqrt 2) for (-1,5) x' = -1/s...

Physics
a = change in velocity/time a = (12-0)/ (177* 10^-3) = 67.8 m/s^2 distance = average velocity * time = 6 * 177*10^-3 = 1.06 meters F = m a m = 2.28/9.81 = .232 kg F = .232 * 67.8 = 15.7 horizontal force there is also a vertical force up by the pitcher = 2.28 to keep it horizon...

physics
v = omega R omega = (44.5 m/s) / (.385 m)

perimeter
outside dimensions = 28 by (x+8) garden dimensions = 20 by x concrete area = 28(x+8) - 20 x = 8 x + 224 cost = 88 (8 x + 224) = 704 x + 19712

Advanced Maths
QB = flow rate through big pipe QB = 1 res /t hours QS = flow rate through small pipe QS = 1 res / (t+3) hours 2 (QB+QS) = 1 res 2 [ 1/t + 1/(t+3) ] = 1 2(t+3) + 2 (t) = t^2 + 3 t 2 t + 6 + 2 t = t^2 + 3 t t^2 - t -6 = 0 (t-3)(t+2) = 0 t = 3

Intermediate Algebra
http://www.mathsisfun.com/data/grapher-equation.html

Intermediate Algebra
http://www.mathsisfun.com/data/grapher-equation.html

Physics Total Mechanical Energy
If it is at rest 50 m high, the total is m g h = 575 * 9.81 * 50 = 282,037 Joules The speed does not matter because we counted the total while at rest. However let's see ho much kinetic energy it has at the bottom (1/2) m v^2 = .5*575*31.3^2 = 281,660 Joules so to 3 signif...

Math help polynomial
Do operations inside parentheses first.

Math help polynomial
-3x(3 y^2) = -9 x y^2

math
http://www.jiskha.com/display.cgi?id=1392477199#1392477199.1392477396

math
no digit here is ten times another however 7,000 = 10 (700) and perhaps that is what the question means.

physical science
been there, scroll down

physical science
Vi up = 10 sin 60 = 8.66 m/s if ax is horizontal acceleration, there is none. Horizontal component of velocity is constant

Math
2^(x-1) = 3^(1-x) ????? (x-1) log 2 = (1-x) log 3 x log 2 - log 2 = log 3 - x log 3 x (log 2 + log 3) = log 3 - log 2 x = (log 3 - log 2)/(log 3 + log 2) you could look those up

Math
4 log x = log x * log x * log x log x * log x = 4 log x = 2 x = 10^2 = 100 if base 10 logs

PHYICS
Ac = v^2/R new Ac = (3 v)^2/R = 9 v^2/R 9 times :)

physical sciences
http://www.jiskha.com/display.cgi?id=1392457436

PHYICS
average angular velocity during stop = 45/2 = 22.5 rad/sec so total angle = 22.5 rad/s * 5 s = 112.5 radians 112.5 radians / 2 pi radians/revolution = 17.9 revolutions

Physics
m g h = increase of potential energy 80 * 9.81 * 10^3 = 785*10^3 Joules 785*10^3 = (1/4) total fuel energy burned so total fuel burned = 3.14 * 10^6 Joules 3.14 * 10^6 J / 37*10^6 J/kg = .085 kg

Calculus 3
I got sqrt 5 on the bottom

Algebra
10 log (2.4*10^-5/10^-16) 10 [ log 2.4 + log 10^11] 10 [11+.38] = 114

Chemistry
1 atm = 10.1 Newtons/cm^2 to find that type 1 atm = Newtons/cm^2 into a Google search box 10.1 Newtons/cm^2 * 17.5*10^3 cm^2 = 177,000 Newtons use the Google search box again: 177000 newtons = pounds and you will get back 39,791 pounds

Simplify 2
You are welcome :)

Simplify 2
19^.5 * 19^.5 = 19^(.5+.5) = 10^1 = 19

Intermediate Algebra
here is the method. Put your numbers in: http://www.jiskha.com/display.cgi?id=1294619397

Physics
u = 16.1 cos 44 = horizontal velocity the whole time Vi = 16.1 sin 44 = initial vertical velocity h = Hi + Vi t - 4.9 t^2 3 = 0 + Vi t - 4.9 t^2 4.9 t^2 - (16.1 sin 44) t + 3 = 0 solve quadratic for t, use the big one v = Vi - 9.8 t u = 16.1 cos 44 still speed^2 = u^2 + v^2

Geometric Constructions HELP!
well, wings are symmetrical port and starboard but not identical replacement cartridges for your printer. DVDs most replacement machinery parts for example new nut for bolt.

Math
f-g = -3 x +irrelevant - 9 x - irrelevant = -12 x + b slope = m = -12 Now you knew these last two perfectly well. Give your answer and let us just check.

precal
r = 16 , I assume grazes ground h = 16 - 16 cos T where T is angle up from straight down h = 16(1 - cos T) let's find out what angle hits 24 meters 24 = 16 (1 - cos T) 1.5 - 1 = - cos T cos T = -.5 T = 120 degrees so between 120 and (360 - 120) = 240 which is 120 or 1/3 of...

Math
constant slope is a straight line

Math
f*g = (x+4)(x-4) = x^2 -16 b) y = x^2 - 16 x^2 is always >/= 0 so smallest y is -16

Ethics
By the way you did not say if you were to pick only one. I am not sure I would count happiness as a moral value, although some would.

Ethics
1. yes, values 2. yes, physical strength

Social Studies--Check My Answers Please--
secede

Check my work plz?
#11 As far as I know they all are. #14 a square is a quadrilateral 4*90 = 360 I do not understand the earlier questions anyway.

Check my work plz?
#11 As far as I know they all are. #14 a square is a quadrilateral 4*90 = 360

Math
y = 5 x or any other linear function with finite slope y = x^3 or any other odd power of x

Physics
G (m )(4-m) /.25^2 = 2.5*10^-10 (4 m-m^2)=2.5*10^-10*.0625*10^11 /6.67 4 m - m^2 = .0234 * 10^1 = .234 m^2 - 4 m + .234 = 0 m = [ 4 +/- sqrt(16 - .0937) ]/2 = 2 +/- 1.997 so I suspect one of them is tiny and the other is about 4 .00293 and 3.997

Math
a) they are odd but 1/x is undefined at x = 0 b) linear but x is odd and |x| is even c) d/dx (2^x) = 2^x ln 2 so both derivatives keep repeating but sin x is periodic

Calculus
Note - I made a mistake in earlier problem, note correction, scroll down

Calculus
yes, that is where f(x) hits the x axis

Math
5 (25/12) = 125/12

Math
ok f'(x) = v(x) = .0015 x - .5825 at x = 100 v(x) = .15 -.5825 = -.4325 = -.43 dh/dt is negative, going downhill :)

Math ???????
hey - do you mean height OVER (meaning divided by) time or height as a function of time? If the latter, we need to take the derivative.

Math
-(5 f/6) > 6/3 we want to multiply both sides by -6/5 If we multiply by a negative, then arrow reverses f < (6/3)(-6/5) f < -36/15

maths
distance = rate * time 300 = 60 t t = 5 hours

Pre-Cal
I already did this today with a 7 minute period anyway They gave you PERIOD = 9 minutes Amplitude = wheel radius = 25 meters midline at 5 + 25 = 30 meters h = 30 - 25 cos (2 pi t/T )

Math
well wherever the derivative is zero, the INSTANTANEOUS rate of change is zero. That means whenever the cos x = 0 which is at pi/2 , 3pi/2 etc so those do work but..... HOWEVER the average change is zero between any two points a period apart in other words between x = 0 and x...

whoops error
a^2 + 4 a = -a -3 a^2 + 4 a + 3 = 0 a = [ -4 +/- sqrt (16-12)]/2 a = -2 +/- 1 a = -1 or -3

Math
You are welcome :)

Math
h(a) = a^2 + 3 a + 2 h(-3)= 9 - 9 + 2 h(a) -h(-3) = a^2 + 3 a so (a^2 + 3 a) /(a+3) = -1 a^2 + 3 a = -a - 3 a^2 + 4 a + 4 = 0 (a+2)(a+2) = 0 a = -2

Math
just for fun, let's see when v = 0 9.8 t = 23 t = 2.3 seconds at top so our problem is all on the way up. so h(2) = -4.9(4) + 23(2) + 2 h(1.5)=-4.9(2.25)+23(1.5) + 2 h(2)-h(1.5) = -4.9(4-2.25) + 23(.5) = 4.5 so v average = 4.5/.5 = 9 m/s part b well I already differentiate...

Pre-Cal
r = 20 period = 7 min = T when t = 0 h = 5 at t = 0 and wheel does rotation between h = 5 and h = 45 center at h = 25 so of form h = 25 - 20 cos (2 pi t/T )

Algebra
L = 2 x + 4 A = L w = (2x+4)(x+2) = 2 x^2 + 8 x + 8 using foil or use distributive property 2x(x+2) = 2 x^2 + 4 x 4 (x+2) = 4 x + 8 -------------------------add 2 x^2 + 8 x + 8 remarkable :)

Physical Science Need Help Quick PLEASE:)
Al;so go back and find I added to answers to your earlier questions

Physical Science Need Help Quick PLEASE:)
Newton - THIRD LAW use Google !!!!!

physics
High school texts --- BOO ! HEADING is the direction you point a boat or plane BEARING is the angle you measure to a lighthouse FROM your boat or plane. That said: V across = 2.11 V down stream = 1.84 |V| = sqrt (2.11^2 + 1.84^2) |V| = 2.8 m/s

physics
momentum at start = 0 momentum at end = .048*69.4 F = change in momentum/change in time (That is the original form Newton gave for the second law. If m is constant that is F=mA) = .048*69.4 / .00101 Newtons

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