Wednesday
March 29, 2017

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Posts by Damon

Total # Posts: 29,637

Physics
http://en.wikipedia.org/wiki/Interference_(wave_propagation) note: [2A] cos (kx- wt) cos(phase angle/2)
March 8, 2017

math
By up I suppose you mean up in y because you have no z coordinate. Just increase all the y locations by 3 and leave the x coordinates the same. eg: S(4,4)
March 8, 2017

no idea
do not see picture
March 8, 2017

physics
Spaceship 2 has it all:) 300*0 = 0 300*4 = 1,200 kg m/s
March 8, 2017

physics, vectors
If a unit vector in the x or east direction is i, the y direction or north is j, and the z direction or up is k, then: momentum vector=12,000 i + 0 j + 0 k magnitude = sqrt (12,000^2+0^2+0^2) =12,000 kg m/s
March 8, 2017

Physics
200(1.5) = .5 w w = 600 Newtons
March 8, 2017

incomplete
What is the question? a = (13.4-0)/5 m/s^2 = r*alpha v = 0 + a t = r*omega d = 0 + 0t + (1/2)(5)t^2
March 7, 2017

Hot math questions
LOL :)
March 7, 2017

English
well, "he" is a person :) Had got no business to be there After the day was done — "It's very rude of him," she said, "To come and spoil the fun." So who does she think the night belongs to?
March 7, 2017

Algebra math 150
height times average of a and b
March 7, 2017

Physics
The increase in gravitational potential energy = m g h where h is the HEIGHT change, the increase in distance from the center of the earth. Work = distance times force IN THE DIRECTION OF MOTION 200 * 4 = 800 Joules alternatively force component up slope * 4/sin 20 = 200 sin ...
March 7, 2017

math 1
when you typed 1/3x + 4 I assume you mean (1/3)x + 4 and not 1/(3x) + 4 or 1/(3x+4) y = (8-x) so (8-x) = (1/3) x + 4 24 - 3 x = x + 12 4 x = 12 x = 3
March 6, 2017

Math
a = 3 m b = 8 m c = 6b = 48 m a/c = 3 m/ 48 m = 1/16
March 6, 2017

Chemistry
(a) but when she opens the bottle the air inside is still at 1 atm so must escape out the open top--> whoosh !
March 6, 2017

math 73
.22 c + .02 m = .04(20) c + m = 20 so m = (20-c) so .22 c +.02(20-c) = .8
March 6, 2017

Physics
omega is angular velocity in radians/second omega R = 5 m/s so omega = 5/.3 = 16.7 radians/second Ke = (1/2)I omega^2
March 6, 2017

Math
You are welcome.
March 6, 2017

Math
Make a number line on a piece of paper. Draw the situation on it. Left 8 from -20 -20-8 = -28
March 6, 2017

you need limits
infinite as stated
March 6, 2017

Calculus
assuming that your answer is correct dy/dx = x^2 e^(x^3/3) but e^(x^3/3) = y-2 so dy/dx = x^2 (y-2) hummm I'll try dy/(y-1) = x^2 dx ln(y-1)= x^3/3 + c (y-1) = e^[x^3/3 + c] y-1 = e^(x^3/3) e^c y-1 = Ce^(x^3/3) y = 1 + Ce^(x^3/3) 3 = 1 + C C = 2 so y = 1 + 2e^(x^3/3)
March 6, 2017

Science
1. wrong 2. right 3. wrong 4. both mass and distance G M1M2/d^2 5. both (or they would bash each other) 6. right 7. It is near the poles that you have darkness at noon when the sun is above the other Capricorn or Cancer :) 8.Right 9. WRONG!!!! (google moon landing) 10. Wrong...
March 6, 2017

English
Nope. None of them are.
March 6, 2017

Social studies
Nope, remember that 3/5 of a person thing?
March 6, 2017

Math
(1/4) 16 = 4 lettuce (1/8) 16 = 2 punpkin (1/2) 16 = 8 red tulips 4+2+8 = 14 16-14 = 2 rows of carrots
March 5, 2017

math
recursive means you get the value from an earlier value or values. An+1 = An + 5 for example Explicit means you calculate it without reference to the former value A = 5 n for example
March 5, 2017

Math
x = 4 y = -2 what more can I say?
March 5, 2017

Science
meters (not kilograms or seconds)
March 5, 2017

Calculus
Nah, I carried an incorrect extra x
March 5, 2017

Calculus
10 x-3xdy/dx-y(3x)=6y^2 dy/dx (6y^2+3x)dy/dx = 10 x -3xy dy/dx = (10x-3xy)/(6y^2+3x)
March 5, 2017

social studies
I am trying to calm down and go back to the calculus question.
March 5, 2017

social studies
http://www.abrahamlincolnonline.org/lincoln/speeches/gettysburg.htm
March 5, 2017

social studies
For heaven's sake Google ! READ THE ADDRESS @!
March 5, 2017

Maths
3 * 7 = 21
March 5, 2017

physics
(1/2) m v^2 = m g h so v = sqrt (2 g h) g = 9.81 m/s^2 h = 30 m
March 5, 2017

value
m g h/t
March 5, 2017

Physics
well first the 2 ohm resistor Vtwo = i R = 1.2*2 = 2.4 volts Now the two in parallel They are both at voltage V V = i1 (6) = i2 (18) but we know i1+i2 = 1.2 so i1 = 1.2 - i2 6(1.2- i2)=18 i2 7.2 = 24 i2 i2 = 7.2/24 = .3 amps through 18 ohm i1 = 1.2 - .3 = 0.9 amps through 6 ...
March 5, 2017

History
North American white pine for spars.
March 4, 2017

History
Archimedes screw pump, capstan, windlass, aft rudder on pintles with wheel, deadeyes and lanyards .....
March 4, 2017

History
LOL, could go on for hours. steam boxes for plank bending. oakum, pitch pine, eventually copper bottom paint
March 4, 2017

History
white oak frames and planking and locust trunnels (tree nails)
March 4, 2017

History
eat limes "Lime-juicers" avoid scurvy
March 4, 2017

History
Navigation technology (determination of longitude)
March 4, 2017

Math
divide by density, not number of people (50/750)100 = 6.67 %
March 4, 2017

physics
1.05*10^5 * .12*.18 = ---- kilograms now it is not clear if that is one of four tires if so then multiply by 4 I wonder because around 2,000 kg is reasonable for a car and four times that is pretty heavy.
March 4, 2017

Science
Venus is volcanic so I suppose you would call hardened lava rocky.
March 2, 2017

Math Trig
d1^2 = 225-100 = 125 d2^2 = 225 - 64 distance between = d1+d2 add because the walls are in front of and in back of the fireman:)
March 2, 2017

Science
Now wait a minute, what do you think dew point means? It is the point where there is so much water in the air that the air can not hold any more at that temperature. That means the relative humidity is 100%
March 2, 2017

math
A bag contains 2 white marbles amd 3 green marbles. Two marbles are drawn at random, one after the other. The first marble is replaced before the second one is drawn. What is the probability that the first marble is green and second one is white?
March 2, 2017

Health
Now you are getting beyond my knowledge of the subject but I think you are correct. The other answers do not make sense.
March 1, 2017

Health
You are welcome.
March 1, 2017

Health
I agree with your answers
March 1, 2017

Math
L = w + 8 (L-5 )(w+4) = L w (w+8-5)(w+4) = (w+8)w (w+3)(w+4) = w^2 + 8 w w^2 + 7 w + 12 = w^2 + 8 w w = 12 etc
March 1, 2017

Math
x + y = 60 .4 x + .9 y = .75 (60)
March 1, 2017

Math
4 1/4 - 3/4 the easy way is 3 5/4 - 3/4 = 3 2/4 = 3 1/2 however if your were into making live hard for yourself you could 4 1/4 - 3/4 = 4-2/4 = 4 -1/2 = 3 1/2
March 1, 2017

Math
well because it is awkward to subtract 3/4 from 1/4 You could do it and work with the negative fraction but it is easier to say: 4 1/4 = 3 5/4 then it is easy
March 1, 2017

Math
You sure need a big calculator but I would settle for 3.14159 (88.3773)^2 because I do not remember pi any further than that.
March 1, 2017

math
Your teacher asks tricky questions :)
March 1, 2017

math
6 * 4 = 24 so 24 dollars for every bag of 7 apples 120/24 = 5 bags of 7 apples you got one free in each bag, so 5 free 5*7 = 35 apples total friend bought 21/7 = 3 bags for $24 each. 3 * 24 = 72 dollars $4 for an apple is ridiculous
March 1, 2017

TEAS 6 MOMETRIX
alternative to that which is called "elimination" is "substitution" from the second equation x + y = 5.90/2 = 2.95 so you can say x = 2.95-y now use that in the first equation 4(2.95-y) + 3 y = 9.55 11.80 - 4y + 3 y = 9.55 y = 11.80 -9.55 = 2.25 again
March 1, 2017

TEAS 6 MOMETRIX
4 x + 3 y = 9.55 now multiply your second equation by 2 4 x + 4 y = 11.80 subtract the first equation from the second 0 x + 1 y = 11.80-9.55 = 2.25 the end
March 1, 2017

Huh
I have no idea what your problem looks like. LS 154 means something to you somewhere, not to me on Massachusetts Bay.
March 1, 2017

math
I got 14 13 + 10 + 9 + 9 = 41 41 - 27 = 14 25/2 = 13 17/2 = 9 for two seaters
March 1, 2017

math
No fair, can not cut two person desk in half :) Please check my reply below.
March 1, 2017

math
then subtract the 27 you have and buy 14
March 1, 2017

math
13 + 10 + 9 + 9 needed
March 1, 2017

math
No, 25/2 is not a two person desk need 13 desks for 25 people and 9 desks for 17 people TRICK QUESTION :)
March 1, 2017

math
Unless you cut them in half of course :)
March 1, 2017

math
well for 25 you need 12 1/2 but that is not possible so 13 +10 + 9 + 9 ----- 41 but we have 27 so we need 41 - 27 = 14
March 1, 2017

math
40% of 30% of 5,000 .4*.3*5,000 .12*5,000 .1*5,000 + .02*5,000 500 + 100 600
March 1, 2017

history
Think Walt Whitman, what was he about?
March 1, 2017

Equations with Fractions
You are welcome.
March 1, 2017

Math
http//www.mathsisfun.com/geometry/pythagorean-theorem-proof.html
March 1, 2017

Math
Need to draw it but can not, going to look for drawing. Here it is :) The square with the triangles outside. http//www.mathsisfun.com/geometry/pythagorean-theorem-proof.html
March 1, 2017

Math
x^2 + y^2 = 61 x x^2 y^2 1 1 == 60 nope 2 4 == 57 nope 3 9 == 52 nope 4 16 = 45 nope 5 25 = 36 SCORE!!! 5 and 6 6 36 well then 25 of course 7 49 = 12 nope 8 too big
March 1, 2017

Physics
the rope is evidently mass less. total force up = total force down because nothing is accelerating. Total force down = m g Tension in rope is T on each side of mass horizontal component of T = T cos angle above horizontal right and left vertical component of T = T sin angle, ...
February 28, 2017

Social Studies
yes
February 28, 2017

Math
agree and by the way: 726 = 2*363 ok but 2*363 = 2 * 3 * 121 BUT 121 = 11*11 :) so we have 1*3*11*11 =11^2 * 6 so sqrt(11^2 * 6) = 11 sqrt 6
February 28, 2017

Math
726 = 2*363 ok but 2*363 = 2 * 3 * 121 BUT 121 = 11*11 :) so we have 1*3*11*11 =11^2 * 6 so sqrt(11^2 * 6) = 11 sqrt 6
February 28, 2017

Physics
do this with north (y) and east (x) components the same way as the one you asked below.
February 28, 2017

Physics
y component = North = 3 + 5 sin 45 x component = East = 5 cos 45 d = sqrt (x^2 + y^2) tan T = y/x where T is angle above x axis 90-T = angle clockwise from north
February 28, 2017

algebra
a(n+1) = a(n) - 8 a = -15 arithmetic sequence see http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html a = -15 a(n) = -15 -8(n-1)= -15+8 -8n = -7 -8n I agree C
February 28, 2017

physics typo?
power in Watts = work in Joules per unit time = m g h /t = 81.5 * 9.81 * 2.70 / 15.50 Watts By the way I do not believe it took the student 15.5 seconds to lift the weight. Do you have a typo?
February 28, 2017

World History
Horses? Firearms? The fact that many of the natives were oppressed subjects of more powerful tribes and were willing to join the Spanish in overthrowing their masters? Relative immunity to common European diseases that wiped out whole tribes of natives?. Sorry, I see a lot of ...
February 28, 2017

Social Studies
I am not familiar with the subject but suspect from the context that one is from Ontario and the other from Quebec :)
February 27, 2017

Physics
assuming that E is horizontal tan 20 = q E / m g
February 27, 2017

Algebra
1 straight line, no bends 2 parabola, bends once 3 cubic , bends twice etc n bends n-1 times :)
February 27, 2017

Social Studies
Hummm, what else is new?
February 27, 2017

still wrong
x^2[4y^3dy/dx] +y^4[2x]+3dy/dx -12x^2 = -5sin x [4x^2y^3+3]dy/dx = 12x^2 -2xy^4-5sinx dy/dx =(12x^2 -2xy^4-5sinx)/[4x^2y^3+3]
February 27, 2017

left out 3y term
x^2[4y^3dy/dx] +y^4[2x]+3 -12x^2 = -5sin x 4x^2y^3 dy/dx = 12x^2 -2xy^4-5sinx -3 dy/dx=3/y^3-y/2x-(3+5sinx)/(4x^2y^3)
February 27, 2017

calculus
d/dx of x^2y^4+3y-4x^3=5cos x-1 ((( note - dx/dx = 1))) so x^2[4y^3dy/dx] +y^4[2x]-12x^2 = -5sin x 4x^2y^3 dy/dx = 12x^2 -2xy^4-5sinx dy/dx=3/y^3 - y/2x- 5sinx/(4x^2y^3)
February 27, 2017

Math Need Help!!
yes sky, right, 144 = 12^2 = 2^4*3^2 an whole number to an even power is a perfect square. Unfortunately 2^5 = 32 and 5 is NOT an even number.
February 27, 2017

Math
R = 4 D R+16 = 2(D+16) 4 D + 16 = 2D + 32 2 D = 16 D = 8
February 27, 2017

Science
Yes
February 27, 2017

MATH
A/B = 2/3 B/C = 3/4 A/B / B/C = 2/3*4/3 = 8/9 C/A = 2 (8/9)/2 = 4/9
February 27, 2017

path around is 2 m wide?
Assuming that, please proofread what you post r = 25 R = 25+2 = 27 so pi(27^2-25^2)
February 27, 2017

Math
for example: http://www.mathsisfun.com/square-root.html
February 27, 2017

physics
For a resistor V = R i for an inductance L where w = 2 pi f V = L di/dt if i = sin wt for example then di/dt = w cos wt and V = (L w) i The L w is called reactance , sort of like "resistance" the ratio of voltage to current
February 27, 2017

Algebra
Given: f(x) = 8-4x A. Find f(-2) f(-2) = 8-4(-2) = 8+8 = 16 ============================ B. Find x, when f(x) = 8 8-4x = 8 so -4x = 0 x = 0/-4 x = 0 =========================== I can not very well graph for you. It is a straight line y = -4 x + 8 when x = 0, y = 8 when y = 0 x...
February 26, 2017

Is E horizontal?
tan 30 = q E / m g
February 26, 2017

ph
q E = 1.6*10^-19 * 800 Newtons
February 26, 2017

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