Monday
December 5, 2016

Posts by Damon

Total # Posts: 28,326

Physics
m g h same g same h (17.3 / 84.7) 2*10^3
October 5, 2016

Physics
.08 * 60 * 9.81 Newtons
October 5, 2016

Physics
pressure = rho g h = 1000 kg/m^3 * 9.81 * 1.2 Force = pressure * area = 1000 * 9.81 cm^2/m^2 *1.2 * .8 /(10,000cm^2/m^2)
October 5, 2016

Physics
zero
October 5, 2016

Physics
as it leaves the hand, ME = (1/2)mv^2 and mgh = 0
October 4, 2016

algebra
take 4.50 off half x and end up with 4.50 (1/2) x = 9 x = 18
October 4, 2016

Physics
F-mg = m a a) mg b) m(g+2) c) mg d) m(g-1.5) e) mg
October 4, 2016

History
I agree with you.
October 4, 2016

Maths
j-3 = 2(x-3) a +3 = 5(j+3) or a = 5 j +12 but j = 2x-3 so a = 5(2x-3) + 12 a = 10 x -3
October 4, 2016

Physics
a east b v = Vi + a t = 12.8 -(7.7/7.4)9.4
October 4, 2016

Math
230.12 ----> 200 if it were 250 I would say 300
October 4, 2016

Math
b works but so does d By the way two things have to happen. a(b+c) = 60 and if ab = 36 then ac must be 24
October 4, 2016

Math
yes
October 4, 2016

Math
both ways are fine.
October 4, 2016

glen view
You mean 20*20*8 - 3200 m^3 ?
October 4, 2016

not at all sure about your answers
I do not know where to start. I think you had best go back and read the relevant chapters in your text again.
October 3, 2016

History
http://www.bbc.com/news/magazine-33291373
October 3, 2016

Physics
change in velocity 20+30 = 50 m/s change of momentum = .15 * 50 kg m/s = impulse F = change in momentum / time = .15 * 50 / .01 Newtons
October 3, 2016

PHYSICS
total mass = 97 + 76 total force = 1176 - 839 so acceleration of system = a = (1176-839)/(97+76) Now look at 97 kg person for example 1176 N to left (for example) T to right net force = (1176-T) a = what we found above so 1176 - T = 97 *a solve for T
October 3, 2016

PHYSICS
Do this the same way as the tug of war problem.
October 3, 2016

Algebra
-2 y + 6 = 2 y - 6 4 y = 12 y = 3 So did you try to do it? What is the problem?
October 3, 2016

math
carbon is 3/25 = 12/100 = 12% No idea. You did not tell me the diameter of the stick.
October 3, 2016

Physics
well, let us assume he drives 280 km out. he takes 280/40 outward or 7 hr he takes 280/70 back or 4 hr so he takes a total of 11 hours to go 560 km so 560/11 km/hr (you are allowed to pick any other distance. I grabbed a common multiple because I do not have a calculator handy :)
October 3, 2016

Physics
PE = m g h d PE/dt = m g dh/dt h = 6 t sin 13 dh/dt = 6 sin 13 so d PE/dt = 6 m g sin 13
October 2, 2016

physics-sir damon help
wind components of speed: north -35 cos 40 = -26.8 east -35 sin 40 = -22.5 heading angle clockwise from N = h north air speed = 220 cos h east air speed = 220 sin h speed made good = v direction = 110 cos 110 = -.342 sin 110 = .940 north = v cos 110 = -.342 v east = v sin 110...
October 2, 2016

Physics
Note always do orthogonal (perpendicular) components of vectors like x and y or north and west. Do not fool around with northwest, split it up into north component and west component immediately. Otherwise you will be doing trig forever.
October 2, 2016

Physics
west distance = 63*2.1 + 53 (sqrt2/2)*3.3 = 255.97 right north distance = 53*(sqrt2/2)*3.3 = 123.67 right so 284.28 is correct for the DISTANCE NOT DISPLACEMENT' Distance is scalar , km Displacement is vector , distance AND direction tan (angle north of west) = 124/256 so ...
October 2, 2016

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

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