Wednesday
December 7, 2016

Posts by Damon

Total # Posts: 28,399

Physics
a. 40 m/s down potential energy = m g h same h so same potential energy so same kinetic energy (1/2)m v^2 b. how long up 0 = 40 - g t t = 40/9.81 2 t = time up + time down = 80/9.81 a parabola, sheds water y = 40 t - 4.9 t^2
October 2, 2016

physics
m v^2/r v less --> force less
October 2, 2016

Physics 12
710 cos 32 horizontal 62*9.81 - 710 sin 32 vertical I doubt it though, tension seems too low
October 2, 2016

Math (Limits)
Yes, if g(x) = x then if x is pi so is g(x)
October 2, 2016

Math (Limits)
I do not know what g(x) is perhaps it is g(x) = 15 x + 27 x^15 for all I know in that case g(pi) = 15*pi + 27 * pi^15
October 2, 2016

physics
NOTE - acceleration is in m/s^2 NOT m/s Its horizontal velocity component does not change since there is no horizontal force u = 4 m/s Vertical Vi = 0 v = Vi + a t v = 0 + 4 * 2 = 8 m/s v = 8 - 12 (1) = -4 m/s so in the end u = 4 and v = -4 speed = 4 sqrt 2 direction = 45 ...
October 2, 2016

Physics
d = Vi t + (1/2) a t^2 = 20.5 mi/hr * 7.67 s + .5(7.96 mi/hr-s)(7.67^2 s^2) = [20.5(7.96) +.5(7.96)(7.67^2)]mi s/hr * (1 hr/3600s) = [20.5(7.96)+.5(7.96)7.67^2)]/3600 miles
October 2, 2016

Physics
HUH? What do you mean? if y = x^2 y does not equal m x + b I suppose you could plot log y = 2 log x that is easiest to do on log/log graph paper.
October 2, 2016

Physics
Now Google Newton's third law !!!
October 2, 2016

Physics
There is one equation, Newton's second law. Force = rate of change of momentum or if the mass is constant F = m A which is mass times acceleration F = .5kg * 4 m/s^2 = 2 Newtons 2 Newtons = 20 A A = 2/20 = 0.1 m/s^2 If you are taking physics, you better read the chapter!
October 2, 2016

chemistry
look up heat of vaporization of water.
October 2, 2016

Math (Domain and range)
also -oo to +oo
October 2, 2016

physical science
if you go 50 km in half an hour, how far do you go in an hour?
October 2, 2016

Math
10 boys 20 girls 30 total students 10/30 = 1/3 are boys
October 2, 2016

Science
If this is a wire or rod or something R = resistivity * length/area so four times the length is four times the resistance
October 2, 2016

maths(Quantitative Method)
sorry, put 1 on the diagonal, zeros off, to get inverse.
October 2, 2016

maths(Quantitative Method)
Yes, Steve's method gives you the inverse matrix as well as the solution
October 2, 2016

maths(Quantitative Method)
+2 -3 +1 +1 -1 +1 -4 +3 +3 -1 +0 +2 I assume this is from |+2 -3 +1| |a| +1 |-1 +1 -4| |b|=+3 |+3 -1 +0| |c| +2 solve for a b and c google gauss jordan
October 2, 2016

AP physics
direct straight line through origin with slope b AP Physics?
October 2, 2016

Physics
just do thee same old hanging problems with g = 9.81 + 1.7 or g = 9.81 + A obviously tension higher in top string
October 2, 2016

Physics
tension = T newtons bottom block: 6.7 g - T = 6.7 a top block on table: T = 4.1 a so 6.7(9.81) - 4.1 a = 6.7 a etc
October 2, 2016

Physics
weight ccomponent down slope F = m g sin 13.2 so m g sin 13.2 = m a so a = 9.81 sin 13.2 ( what else is new?) d = (1/2) a t^2 1.7 = (1/2) a t^2 solve for t then v = a t
October 2, 2016

Physics
force = change in momentum / time average speed = s = 10^5(6+2.6)/2 so time = t = .044/s F = 9.11*10^-31 (6-2.6)10^5 / t compare to m g
October 2, 2016

Math
x = e^(2y+4) - 4 ln(x-4) = 2y+4 y = [ ln(x-4) - 4 ] / 2 x better be bigger than 4
October 2, 2016

Physics
north: 3 -1 +2 +2
October 2, 2016

Physics
it is not accelerating therefore: Sum of forces in the x direction = 0 Sum of forces in the y direction = 0 Sum of moments around any point = 0 by the way 7 kg down is 7*9.81 Newtons down and tension in the line
October 2, 2016

Physics
1. Like the gravitational field of the earth if the object is the moon or the friction of tires on road if a car in a turn :)
October 2, 2016

mathematics
If I understand you first person gets x second gets .5 x third gets .25 x 1.75 x = 3500
October 2, 2016

differential equation
Oh, yes, the diff eq which everyone already knows the solution for da/dt = -ka da/a = - k dt ln a = -kt a = A e^-kt
October 2, 2016

please type the whole problem
How many after 2.5 ? x = Xi e^-kt x = 75 e^-2.5 k ln(x/75) = -2.5 k k = ln(x/75)/(-2.5) solve for k so ln .5 = -k t solve for t
October 2, 2016

Physics
m v^2/r
October 1, 2016

Physics
angle pushes car toward center, centripetal
October 1, 2016

physics
you do not say what the question is average rpm during stop = 1150 turns to stop = 1150 *2.9/60 original radians/s = 2300 revs/min*2 pi rad/rev *1min/60 s = 241 radians/s angular acceleration = -241/2.9 whatever
October 1, 2016

Math
10 x + 15 y = 2500 y = 195-x 10 x + 15(195-x) = 2500 10 x + 2925 - 15 x = 2500 5 x = 425 x = 85 y = 195-x = 110
October 1, 2016

Math
70*400 = 28,000
October 1, 2016

Pre Cal help please!!
given f(x) = { 2x^2 + 5 x < or equal to 2 3 - x^2 x > 2 What???? Perhaps you mean: given f(x) = 2 x^2 + 5 when x < or equal to 2 3 - x^2 when x > 2 if x is slightly bigger than 2 3 - 4 = -1 if x is slightly smaller than 2 OR if x is 2 then 2(4) + 5 = 8+5 = 13
October 1, 2016

Physics
24.5 x = 85.5(11.6-x)
October 1, 2016

Physics
I guess an intercontinental ballistic rocket is something "thrown over a large distance (on earth)" so 5. What a nutty question though :)
October 1, 2016

maths
(x^3+y^3)(x^3-y^3) (x^3+3x^2y+3xy^2+y^3)*(x^3-x^2y+3xy^2-y^3)
October 1, 2016

Trigonometry
in an hour he goes 1/24 of circumference (1/24)(2 pi *12,000/pi) = 24,000/24 = 1000
October 1, 2016

Physics
fast one takes t = 76/5.2 seconds slow one goes d = 2(76/5.2) so 76 - 2(76/5.2)
October 1, 2016

simpson
http://www.wolframalpha.com/input/?i=solve+dy+%3D+sin(x%5E2)+dx
October 1, 2016

Physics
Ac = v^2/r = 36/2 = 18 m/s^2 m F = M Ac = 51 *18 Newtons weight = 51 * 9.81 Newtons almost 2 g
October 1, 2016

value
change of momentum = .03*600 = 18 average speed = 300 time = .2/300 Force = change of momentum/change of time = 18 *300/.2 Newtons = 90*300 =27,000 agree
October 1, 2016

maths sir-reiny help calculus
Click on the step by step in Wolfram
October 1, 2016

maths sir-reiny help calculus
http://www.wolframalpha.com/input/?i=solve+x+y+dx+%3D+(x%5E2+-x+y+%2By%5E2)dy
October 1, 2016

Algebra
first scoop has 19 choices second has 18 choices cone has 3 choices 18*19*3
October 1, 2016

Probability
first ace 4/54 second ace 3/53 third ace 2/52 first king 4/51 second king 3/50 multiply them
October 1, 2016

whoops
30/54
October 1, 2016

sorry
30/54
October 1, 2016

Math Help!
7/54
October 1, 2016

Science
if near earth surface F = m g = 2.5 * 9.81 N and acceleration is g = 9.81 m/s^2 if at great distance r from earth center you need to do F = 2.5 G Mearth/r^2 so a = G Mearth/r^2
October 1, 2016

math condense logs
ln is log base e 3[ln x-2 ln(x^2+1)]+2 ln 5 ln a - ln b = ln (a/b) n ln x = ln x^n so 3 ln [ x/(x^2+1)^2] + ln 25 ln 25[ x/(x^2+1)^2]^3 so agree with Sam
October 1, 2016

maths asap need help
pi/6 = 30 degrees our lines go though a point 5 units along there from origin x = 5 cos 30 y = 5 sin 30 that 30 degree line has slope sin30/cos30 = .577 the perpendicular has slope -1/.577 = - 1.732 so line is of form y = -1.732 x + b now put in y = 5 sin 30 and x = 5 sin 30 ...
October 1, 2016

Math
1/4 of them seem to be rotten so 25
October 1, 2016

algebra
d = 16 t^2 at t = 6, d = 16*36 = 576 at t = 7, d = 16*49 = 784 784 - 576 = 208
October 1, 2016

Physics
half a period 14 t changes by pi say from 14t = 0 to 14t = pi or t = pi/14
October 1, 2016

Math (Finding points of intersection)
You are welcome.
October 1, 2016

typo
do you mean -x+y = 1 ????? so y=x+1 if so circle with center at (0,0) and radius 1 line through (0,1) and (-1,0) x^2 + (x+1)^2 = 1 x^2 + x^2 + 2 x + 1 = 1 2 x^2 + 2 x = 0 x(x+1) = 0 x = 0 or x = -1 line hits the circle at the x and y axis intersections
October 1, 2016

I am having trouble with this homework question ,
first add those up to see if they add to one Yes, they do so everyone has one of those 4 types THEREFORE probability not O = 1 - probability of O 1 - .53 = 0.47
October 1, 2016

MATH HELP ASAP
Just like the other one there are 7 females with A out of 75 students probability that student is female with A = 7/75 so probability not female with A = 1-7/75 = 0.907
October 1, 2016

MATH 125 help
Hey look, I just did the not a female with A. Now you do this one.
October 1, 2016

Cards Probability
7/13
October 1, 2016

beats me
I wish the math people would stay away from navigation. They are hopeless at distinguishing between bearing and heading and here they evidently think a boat moves with the wind like an airplane forgetting that the hull is in the water sort of like a car on a road in a ...
October 1, 2016

PROBABILITY : M&M'S
Randomly picking what Amanda, two reds and a green in three picks?
September 30, 2016

question incomplete
finish the sentence please
September 30, 2016

PROBABILITY MATH HELP!!!!! DICE
There are 6 sides 1,2,3,4,5,6 three of those are even 3/6 = 1/2 = 0.5
September 30, 2016

Math
17 - 33 = -16 wicked cold around zero Fahrenheit
September 30, 2016

Algebra
9. j-3=-7 A. j=-10 B. j=21 C. j=-4 D. j=4 🔹🔹🔹 NO!!!! add 3 to both sides, result negative
September 30, 2016

Algebra
5. 2/3x=6 A. x=9 B. x=4 C. x=18 D. x=12 🔹🔹🔹 NO, what on earth are you doing?
September 30, 2016

Algebra
4. -2c=-18 A. c=-9 B. c=-36 C.=9🔹🔹🔹 YES THIS TIME
September 30, 2016

Algebra
4. -2c=-18 A. c=-9🔹🔹🔹? B. c=-36 C. c=9 D. c=36 NO!!!!!!
September 30, 2016

Social studies
I agree.
September 30, 2016

Maths,fractions
(6/15 + 5/15 + 4/15)x = x looks like 15 to me. There is no smaller common denominator
September 30, 2016

english
Players usually kick or "head" none :) to their teammates on the field.
September 30, 2016

Is it possible if you guys can check my algebra HW
Yes, it is possible, but what did you do?
September 30, 2016

Is it possible if you guys can check my algebra HW
take x from bag 2 take 3x from bag 1 amount now in bag 2 = 100 - x amount now in bag 1 = 100 - 3x 100 - 3 x = (1/2)(100 - x) 200 - 6 x = 100 - x 5 x = 100 x = 20 so bag 1 = 100 - 3(20) = 40 bag 2 = 100 - 20 = 80
September 30, 2016

Pre alg
y = 3 x-11 x+y = 153 Is that what you mean? If so x + 3x-11 = 153 4 x = 164 x = 41 y= 112
September 30, 2016

math
ROFL !!!!! yes
September 30, 2016

Spanish
I am assuming the first one is asking what someone else is like, not "you" :)
September 30, 2016

Spanish
Even I can do the first one. it is not what is your name it is not how am I it is not how are you What are your answers?
September 30, 2016

English
trust or lack thereof is certainly a theme see http://study.com/academy/lesson/the-death-of-arthur-summary-themes-quiz.html
September 30, 2016

Physics
a = -.8 g v = 4 - .8(9.81) t at v = 0 t = 4/[.8*9.81)
September 30, 2016

Advice and Consent
In the United States the SENATE must approve treaties. The Supreme court can always find anything unconstitutional :) SEE: http://www.senate.gov/general/Features/Treaties_display.htm
September 30, 2016

typo, Pascals
Newtons/m^2 = Pascals
September 30, 2016

Physics
Vi = 30 sin 40 u = 30 cos 40 h = 0 + Vi t - 4.9 t^2 0 = 30 sin 40 t - 4.9 t^2 0 = t (30 sin 40 - 4.9 t) so t = 30 sin 40/4.9 for downrange time range = r = u t r = 30 cos 40 * 30 sin 40 /4.9 = 30^2 sin 80/9.8 so the first one :)
September 29, 2016

History
well B is just as unlikely as C :)
September 29, 2016

typo
5/9 * 4/8 = 20/72 = 5/18
September 29, 2016

maths
susan takes lemon then ann takes lemon: 5/9 * 4/8 = 20/72 = 5/13 susan takes orange then ann takes orange: 4/9 * 3/8 = 1/6 add them
September 29, 2016

Math
3 2/3 = 9/3 + 2/3 = 11/3 17/4 = 16/4 + 1/4 = 4 1/4
September 29, 2016

math
.02 * 30 = original amount of dry cucumber which does not change .11 x = .02 * 30
September 29, 2016

Math hellppp!!
You are welcome.
September 29, 2016

Math hellppp!!
I get your parentheses right (-12/3)*(-8+(-4)^2-6)+2 -4^2 = 16 -8+16-6 = 2 -12/3 = -4 -4* 2 = -8 -8 + 2 = -6
September 29, 2016

Math
so what is 5^3 ?
September 29, 2016

Math
96/2 = 48 48/2 = 24 24/2 = 12 12/2 = 6 6/2 = 3 so 3*2^5 what is 5*5*5 ?
September 29, 2016

Math
let y = f(t)/2.7 to make it easy y = 1.004^t ln y = t ln 1.004 = 0.00399 t e^ln y = y = e^.00399 t so f(t) = 2.7 y = 2.7 e^.00399 t
September 29, 2016

Social Studies Religion
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; ........ If it does not ring a bell, use Google :)
September 29, 2016

History PLEASE CHECK MY WOrK
I agree with you.
September 29, 2016

History
Portuguese owned Brazil. Brazil had manioc. Portuguese took it to Africa. A
September 29, 2016

History
still A Google manioc Portuguese Brazil
September 29, 2016

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