Saturday
April 19, 2014

Posts by Damon


Total # Posts: 16,161

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

physics
Ac = v^2/r F = m Ac = 1200 * 144/45

B-Tech mechanical
Google "Mohr's circle". for example: http://www.youtube.com/watch?annotation_id=annotation_851576&feature=iv&src_vid=1plaFAWN8rk&v=qqgfKHBpj1k

Physical Science
a = change in velocity/change in time = (11 - 0) / 10 = 1.1 m/s^2

Physics
However in general find x or east component Cx =A cos(angle to x axis of A) + B cos (angle to x axis of B) find y or north component Cy =A cos (angle to y axis of A) + B cos (angle to y axis of B) (note cos of angle to y axis is sin of the angle to x axis) then |C|^2 = Cx^2+Cy...

Physics
I do not know what those angles are measured from and in what direction from the x axis or north or whatever

Science
divide the total distance by the total time. That gives the average SPEED. If you divide the total DISPLACEMENT (which includes the effect of the directions of the VELOCITY vectors) by the total time you get the average VELOCITY for example walk one mile north at 1 mile/hr the...

typo
your DISTANCE walked is 2 miles in two hours so your average speed was 1 mile/hour

Science 8th Grade
divide the total distance by the total time. That gives the average SPEED. If you divide the total DISPLACEMENT (which includes the effect of the directions of the VELOCITY vectors) by the total time you get the average VELOCITY for example walk one mile north at 1 mile/hr the...

Science 8th Grade
You are welcome.

Science 8th Grade
The hiker spent one hour going 6 km west.

Algebra-help
You are welcome.

typing ?
could you mean y = 2/(7x-4) or do you mean what you typed y = [2/(7x)] - 4 or possibly could you mean y = (2/7) x - 4 ???????????????? if the last, which I am guessing from the 28 in all the answers, then: 7 y = 2 x - 28 2 x - 7 y = 28

Math HELP
sin 30 = 1/2 so 1/2 = short side/hypotenuse = short side/18 so short side = 9 which is none of the above.

Physics
u = .9 cos 23 = .828 until it hits ground Vi = - .9 sin 23 = -.352 so h = Hi + Vi t -4.9 t^2 0 = 5.4 - .352 t - 4.9 t^2 t^2 + .0718 t - 1.1 = 0 t = [ -.0718 +/- sqrt(.00516+4.4) ]/2 t = [ -.0718 +/- 2.1 ] /2 = 1.01 second d = u t = .828*1.01 = .839 meters

Physics
How long does it take him to reach the landing spot? d = 0 + 0 + (1/2) a t^2 8 = .5 * 2 * t^2 t^2 = 8 t = 2 sqrt 2 seconds he has to start 2 sqrt 2 seconds before the ball reaches the catching point.

Physics
u = 30 cos 38.3 Vi = 30 sin 38.3 Hey, this is very much like the pizza on the roof problem I just did. Follow my solution to that one, then do this one.

Physics
All three of these problems are really the same Joy. Solve one and you solve them all.

Physics
Vi = 20 h = Hi + Vi t - 4.9 t^2 -5 = 0 + 20 t - 4.9 t^2 t^2 - (20/4.9) t - 5/4.9 = 0 solve quadratic for two values of t, use the positive one.

Physics
I showed you how to get the magnitude. Scroll down. tan theta = sumy/sumx

Physics
x components of each 57 cos 130 = -36.6 38 cos -130= -24.4 25 cos 29= 67 cos -64= sum of x components = sumx = y components of each 57 sin 130= 38 sin -130= 25 sin 29= 67 sin -64= sum of y components = sumy = |F|^2 = sumx^2 + sumy^2

Physics
x = r cos T y = r sin T 4 = r cos 46 r = 4/cos 46 = 5.76 y = 5.76 sin 46 = 4.14

Science
You are welcome :)

Science
Yes

Science
Google "photosynthesis".

Edu 656-Education My take on it
Well, let me see. I read "The Sea and Civilization" which reminded me to go south from Crete, then east along the North African coast, drop my wares at Alexandria, sail east to the Levant, North along the Levant to Asia Minor, west along the coast of Asia Minor to ab...

English help explaining
It is gibberish but I think the author is trying to say that the immigrant is isolated from the new community and remembers the old life as he/she is learning to live in the new place and its differences from the former life.

Math
x^2 + 8 x + 1 = -3y x^2 + 8 x = -3y - 1 x^2 + 8 x + 16 = -3 y + 15 (x+4)^2 = -3 (y-5) vertex at (-4,5) symmetric about x = -4 y = 0 when (x+4)^2 = 15 x+4 = +/- sqrt 15 x = -4 +/- sqrt 15 are the zeros

Math
As it is stated it is impossible to solve because you can not start at both 20 and at 1.25 feet :)

Math
Where did you find this problem? at t = 0, the senior has to be at 20 feet I think. however your function shows her at 1.25 feet at t = 0 That is not right. Moreover in real life h = Hi + Vi t -(1/2) g t^2 in the feet/seconds system -(1/2) g t^2 is about -16 t^2 NOT -t^2

math
r = 2 is positive root from http://www.mathportal.org/calculators/polynomials-solvers/polynomial-roots-calculator.php so w = 4

math
width = 2 r length of rectangle = 2 r + 2.25 area of semicircle = (1/2) pi r^2 area of rectangle = 2r(2r+2.25) total area of free throw section = (pi/2) r^2 + 4 r^2 + 4.5 r Pi/2 + 4 = 5.57 5.57 r^2 + 4.5 r = 31.28 5.57 r^2 + 4.5 r - 31.28 = 0 use quadratic equation to solve or...

math
V = pi r^2 h = pi (x+5)^2 x = pi (x^2 +10 x +25)x = pi (x^3 + 10 x^2 + 25 x = 1920 ???? if so then x^3 + 10 x^2 + 25 x - 611.15 = 0 find roots: http://www.mathportal.org/calculators/polynomials-solvers/polynomial-roots-calculator.php Only real root is at x = 5.52 then r = 10.5...

Math
if k+1 = 0 , then the product is 0 so k+1 = 0 k = -1 first answer if 4k+5 = 0 then product = 0 so 4k = -5 k = -5/4 second answer

Physics
speed up = 1.2 - .5 = .7 speed down = 1.2 + .5 = 1.7 time up = 1000/.7 seconds time down = 1000/1.7 seconds add those times in still water 2000/1.2 seconds

Math
I assume D x a means D a I know nothing about medicine but a) at t = 0, e^0 = 1 so C(0) = something(1-1) = 0 It has not had time to be absorbed after a long time, both e^-bt and e^-at approach zero so the concentration approaches zero. At first assuming a is much bigger than b...

Physics
ultraviolet is not visible for humans.

Physics
http://www.jiskha.com/display.cgi?id=1392230927

Science ( Need help really bad Please!)
F = m g or Weight = mass * acceleration of gravity m is mass, sometimes in kilograms. It is the same everywhere and depends only on which proton and neurons are there and how many. g is the acceleration of gravity. On earth it is about 9.81 meters/second^2 On the moon for exam...

Astronomy
See below about precession of the equinoxes. http://www.astro.com/astrology/in_praezession_e.htm

Astronomy
Leo

science
The water exerts a force up on your hand equal to the weight of water displaced. Therefore an equal and opposite force is down on the scale. Ultimately that force comes from your arm pushing the finger down into the water. In the air there will be no effect because you are not...

physics
a = F/m = 890/265 d = 0 + 0 + (1/2) a t^2 3 = (1/2)(890/265) t^2 solve for t v = 0 + a t v = (890/265) t

physics
C = Q/V 30 * 10^-12 = Q/3 Q = 90 * 10^-12 coulombs

maths
lcd = 3*3*5 = 45 8/45

Algebra 2
I do not know a better way than to say the terms are 2n/(n+2)

Math
(12in/36 hr)* (24*7 hr/wk) = 56 in/wk

math
use denominator of 36 5/6(6/6) + 3/4(9/9) = 1/18(2/2)- 6c - 2/3(12/12) + 7c + 1/9(4/4) 30/36 +27/36 =2/36 -6c -24/36 +7c +4/36 75/36 = 1 c

Math
15 - .75 n = 13 - .5 n .25 n = 2 n = 8

Physics
weight = mass * g = 9.81 m

Physics
gravity on earth g = 9.81 m/s^2

Physics
You are welcome :)

Physics
weight = m g = 1*9.81 = 9.81 N max friction force = .3*9.81 = 2.94 N 2.94 = k x = 29 x x = .101 meter = 10.1 cm

physics
P = V*i = 4.04*10^6 * 23.4 * 10^-3 94.5 * 10^3 = 94,500 watts

PHYSICS
By the way, I answered your roller question problem long ago.

PHYSICS
energy stored in LH spring at max = (1/2)kx^2 = (1/2)130(.16)^2 same amount will be stored in the RH spring when it is compressed all the way (1/2)130(.16)^2 = (1/2)280 x^2 x^2 = (130/280).16^2 x = .11 meter = 11 cm part b (1/2)k x^2 = (1/2)m v^2 130 * .16^2 = .2 v^2 v = 4..08...

Intermediate Algebra
F(t) = 600 - 20 t for t </= 30

PHYSICS
http://www.jiskha.com/display.cgi?id=1392238771

physics
it starts at h = 5 it ends at h = 1.5 it fell 3.5 meters

MATH
You are welcome :) be sure you want mm^2, usually that would be converted to cm^2 or m^2

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