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March 27, 2017

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Posts by Damon

Total # Posts: 29,623

Social Studies
Particularly this excerpt: "Japan had been closed to the outside world for 250 years. When foreign people entered Japanese waters, even if they were shipwrecked by accident, they were interned in jails and some of them were killed (Lubor 33). The reasons for the Japanese ...
January 4, 2017

Social Studies
Ah yes, this is short and sweet http://willamette.edu/~rloftus/perry.html
January 4, 2017

Social Studies
I am looking for a link for question 2
January 4, 2017

Social Studies
no, no
January 4, 2017

Social Studies
Now for question 2, perhaps we better look at the start of American-Japanese relations. Did you read about only the Dutch being allowed there before that fleet arrived?
January 4, 2017

Social Studies
here is a wiki for Goa: http://www.google.com/search?q=goa+india&ie=utf-8&oe=utf-8
January 4, 2017

Social Studies
Well, I suppose I could give you some link to a wiki or something, but first think about it. The Portuguese ended it all in India long this after with Goa. Can you imagine a little country like Portugal marching around India ? They were sea farers
January 4, 2017

Social Studies
In question 1, remember we are talking about the Portuguese, not some tea company.
January 4, 2017

Social Studies
Ah, what do you think? The answer to question 2 is petty dramatic and amazing.
January 4, 2017

Pre calc
y = m x + b y = -(3/2) x +3/4 or 4 y = -6 x + 3
January 4, 2017

History
Well, my choices would be: 1. Prince Henry the Navigator, Bartolomeu Dias, Vasco da Gama .... so D 2.I would say B 3. See question 1.
January 4, 2017

Math
65*50 = 6500/2 = 3250 ft^2 so 1625/3250 $/ft^2
January 4, 2017

American Government
County responsibility is now chiefly law enforcement (sheriff and county jail) and registry of deeds and such. However it still exists and the towns and cities have not take over all county responsibilities.
January 4, 2017

American Government
Although our ounty government has been largely eliminated over the last decade, we still have a sheriff etc. Our town governments operate much like our city governments, although often having a Board of Selectmen instead of a City Council. Both towns and cities are often run ...
January 4, 2017

American Government
http://en.wikipedia.org/wiki/Essex_County,_Massachusetts
January 4, 2017

Physics
I think it is a dip and v^2/R = 0.15*9.81
December 30, 2016

Physics
density = 1000 kg/m^3 is easier :) You do not say if you want gage pressure or absolute pressure I will assume gage rho g h = 1000*10*25 =2.5 *10^5 Pascals or N/m^2 if you want absolute pressure add one atmophere or about 1*10^5 for a total of 3.5*10^5 Pascals
December 30, 2016

Physics
You already said the speed of the boat through the water was 2 m/s The speed over the land is 2-.8 = 1.2 m/s
December 30, 2016

physics
v^2/R = g or it loses contact m g(h-D) = .5 mv^2 v^2 = g R = .5 g D so m g(h-D) = .5 m *.5 g D =.25 mgD h-D = .25 D h = 1.25 D
December 30, 2016

Math
anything^0 = 1 so x^3/x^3 = x^0 = 1 y^6/y^6 = y^0 = 1 so 1
December 29, 2016

asthmatics
assuming it is the height that is 9.5 outside volume = 23 * 15.5 * 11 inside volume = 20 * 12.5 *9.5 now subtract the inside from the outside
December 29, 2016

maths
Thank you rabin for entertaining the math tutors :)
December 29, 2016

Chemistry
(750-726)/(20-10) = 2.4 (800-750)/(40-20) = 2.5 (880-800)/(70-40) = 2.7 (960-880)/(100-70)= 2.7 slope increasing a bit but 2.7 seems a reasonable guess slope = (x-960)/(150-100) (x-960)= 50(2.7) x = 960 + 135 = 1095
December 28, 2016

calculus
http://www.mathsisfun.com/calculus/differential-equations-homogeneous.html LOOK at the example at the end :)
December 28, 2016

Physics
This might help: http://www.slideshare.net/ahmedqadoury/periodic-and-aperiodic-sounds-2
December 28, 2016

Physics
I am sorry I can not because if you do a Fourier transform on even a spike you can express even an impulse as a sum of periodic signals. However there are articles on non-periodic vibrations in the technical literature. I question if they are really that but anyway take a look...
December 28, 2016

math, algebra
120 + 7 x = 11 x so 4 x = 120 x = 30
December 28, 2016

Matt
2.54 cm/in L in cm = L in inches (2.54 cm/in) so 2.54 times as many centimeters as inchess
December 28, 2016

Science
MASS IS CONSERVED! Until you get to Einstein and Special relativity, the total mass is CONSTANT. .015 + .050 = .065 kg
December 28, 2016

Math
time = t vf t = 260 vp t = 320 so 260/vf = 320/(vf+15) 320 vf = 260 vf +260(15) 60 vf = 390 3 vf = 39 vf = 13 km/hour
December 28, 2016

SAT Math Question?
L --- 1/3 job/hr S ---1/5 job/hr together 1/3 + 1/5 = 8/15 job/hr (8/15 j/h)(1 h) = 8/15 job done that leaves (15-8)/15 = 7/15 to do (1/5)job/hr * t = 7/15 job t = 35/15 hr for S to finish 35/15 hr * 60 min/hr = 140 min
December 28, 2016

algebra
3j(j^2-17j +70) =3j (j-10)(j-7)
December 26, 2016

algebra
9 r^2 - 30 r + 25 = 0 (3 r -5)(3r-5) = 0 r = 5/3 and 5/3 repeated, parabola just touches r axis
December 26, 2016

algebra
2(2a^2-5a+3) is 2(2a-3)(a-1)
December 26, 2016

algebra
64 z^2 - 1 That is the difference of two squares remember a^2-b^2 = (a-b)(a+b) so (8z-1)(8z+1)
December 26, 2016

nobody knows
Did you try to copy and paste? That does not work.
December 26, 2016

physics
Assuming that they are in series, 1.2 amps goes through each so current density = 1.2 /(pi d^2/4) for each
December 26, 2016

calculus too hard
Use Steve's solution if no typos in problem statement.
December 26, 2016

calculus too hard
I am still not sure it is right maybe dx/dt = k(a-t) ?? if so try x = c + p t - kt^2/2 then dx/dt = p -kt then p = ka and if c = 0 then dx/dt = 0 +ka -kt = k(a-t) so then x = ka t - k t^2/2
December 26, 2016

typos?
I think you might mean dx/dt = k(a-x) but what is c?
December 26, 2016

Maths
tan 60 = X1/1 tan 30 = X2/1 d = X2 - X1 v = d/t t in hours = 10 s /(3600 s/hour)
December 25, 2016

math
angles OBA and OCA are right angle BOC is 90-40 = 50 ABC =180 - 20 - 90 = 70 = ACB
December 25, 2016

Maths
1.12 p = 15,000
December 25, 2016

Calculus 3
No, because multiply by sqrt 14 which is |n|
December 25, 2016

Calculus 3
n = 3 i +2 j + k we want F dot n = |F| |n| cos angle but we are given that |F| cos angle is 3 z/sqrt14 so what is |n|? sqrt (9+4+1) = sqrt 14 ha, that helps :) so F dot n = 3 z so do the integral of 3 z over the surface
December 25, 2016

Calculus 3
http://tutorial.math.lamar.edu/Classes/CalcIII/SurfIntVectorField.aspx boundary in first quadrant means x from 0 to 2 and y from 0 to 3 (sketch that thing)
December 25, 2016

math
89/18 =4 + something 4 * 18 = 72 89 -72 = 17 left over
December 25, 2016

Physics
well, sure the tension does work, but the idea is that you do not have to get into the innards of this system because its kinetic energy is described by the (1/2)(m1+m1)v^2 and (1/2) I omega^2 and its potential energy by the m g h of the two objects. You could solve the whole ...
December 24, 2016

sorry, read -1 not -3
-3(-2) = +6
December 24, 2016

MATH
y = -1 x +42 slope = -1 = change in y/change in x if change in x - -1 then change in y /-2 = -1 so change in y = -1 (-2) = +2
December 24, 2016

Physics
max ke = max Pe = m g h h = r (1-cos 60) = r/2 so max (1/2) m v^2 = m g r/2 max v^2 = g r T = m g + m v^2/r T = m (g + g) = 2 m g = 2(.05)(10) T = 1 Newton
December 24, 2016

physics
4 *10 = 40*v v = 1
December 24, 2016

Physics
q = c v same q on each v1+v2 = 100 q/c1 +q/c2 = 100 q/4 + q/2 = 100 3 q/4 = 100 q =400/3 on each now same v on each and total charge=800/3 and total c = 6 v = q/c = 800/18 = 44.4 volts
December 24, 2016

algebra
let's see we need 5*5-1 in the middle something of form (5c ) ( 5) (5c-1) (c +5)NO that gives +24, we want - (5c+1)(c-5) = 5c^2 -24c -5 progress so (5c+d)(c-5d) = 5c^2 -24cd -5d^2 done
December 23, 2016

physics
Ac = g there = v^2/R = omega^2 R omega = 2 pi radians/24 hours =2 pi radians /(24*3600)seconds R is given so find omega^2 R
December 23, 2016

Specialist Mathematics
|x+y| two possibilities A: x+y B: -x-y = -(x+y) if A: x+y is maximum when both are + then x+y = |x|+|y| if B: -(x+y) has same absolute value as A etc
December 22, 2016

History -
I think I might have picked C because some of them are in South America and Asia and the Middle East.
December 22, 2016

Linear Relations MATHS
You are welcome
December 22, 2016

Linear Relations MATHS
That means 3/4 of the way along the line segment from A to B That means 3/4 in x and 3/4 in y in x -4 +(3/4)(6 - -4) = -4+ 3*10/4 = = -16/4 +30/4 = 14/4 = 3 1/2 in y 6 + (3/4)(-7-6) = 6- 13*3/4 = 24/4-39/4 = -15/4 = -3 3/4 so (3.5 , -3.75) In part B same deal but times 3, not ...
December 22, 2016

Math
36 = .6 p so p =36/.6 = 360/6 = 60
December 22, 2016

math help
does "cross product" or "vector product" ring a bell? the cross product of two vectors is perpendicular to both +i +j +k +2 +1 +1 +1 -1 +2 (2+1)i +(1-4)j + (-2-1)k = 3i -3j -3 k
December 22, 2016

History - Help
http://www.fsmitha.com/h2/ch14-4.htm
December 22, 2016

History - Help
You are welcome.
December 22, 2016

History - Help
Yes, see https://en.wikipedia.org/wiki/Westphalian_sovereignty
December 22, 2016

Mathematics
50 (30/25) = 2*30 = 60
December 22, 2016

Social Studies
Where should I start???? Load and unload ships, trucks, trains, and planes or in the case of ports at the mouth of rivers (New Orleans, Rotterdam), transfer cargo between river barges and seagoing ships. Builds and repair ships and port facilities. Do the paper work and number...
December 21, 2016

math
(0,5800) and (5,7420) (7420-5800)/5 = (y-5800)/(x-0)
December 21, 2016

math
Well I showed you that the first choice is NOT a solution to the equation. However It might not be the only one. Check them all.
December 20, 2016

math
Try each of them for example -52 = -5(10) - 4 -52 = -54 I do not think so check the others as well.
December 20, 2016

Math
You are welcome.
December 20, 2016

Math
L,w,h area = 2 Lw + 2 Lh + 2wh = 600 so Lw+Lh+wh = 300 but L = 3w so 3 w^2 + 4 w h = 300 now V = L w h = 3 w^2 h so h = V/3w^2 3 w^2 + 4 w(V/3w^2) = 300 4 V/3w = 300 - 3 w^2 (4/3)V = 300 w - 3 w^3 we want d(4/3)V /dw = 0 300 = 9 w^2 w = (10/3)sqrt 3 L = 10 sqrt 3 w L = 100 so...
December 20, 2016

physics
I agree but wonder about the straight line. There is not enough gravity to hold them down, but there is still a force toward the earth center so I think the departure path would curve.
December 20, 2016

Math
You never know who will be online. All you can do is post the question. There are a lot of math teachers who check in here.
December 20, 2016

Math
Yep, it's right :)
December 20, 2016

calculus
right triangle 3,4,5 or 60,80,100 x= 60 y = 80 z = hypotenuse = 100 dx/dt = 80 dy/dt = 100 z^2 = x^2+y^2 2 z dz = 2 x dx + 2 y dy z dz/dt = xdx/dt +y dy/dt 100 dz/dt =60*80+80*100 dz/dt = 6*8+80 dz/dt = 128 km/hr
December 20, 2016

History
Heavens! Look at a map. What is the biggest river in the now United States? Texas where the beef comes from for Richmond is west of the river. Remember that fleet coming up from the Gulf of Mexico ("Damn the torpedoes" :)
December 20, 2016

another no way
You try first. I already took the course.
December 20, 2016

No way
I do not see any attempt by you to do these problems. I already took this subject and do not need the practice. You try first. Also read what you typed.
December 20, 2016

Math
25-13 = 12 which is the sum of the two bases at the ends h is the height area of rectangle in the middle = 13 h x is base of one triangle (below the 10) so 12-x is the other(below the 15 (12-x)^2 + h^2 = 225 x^2+h^2 = 100 ---------------------subtract 144-24x = 125 x = 19/24 ...
December 20, 2016

math
(9/14)(35,000) =
December 20, 2016

Math
Yes but do the division 9/3 = 3 laps/min 30/6 = 5 laps/min 20/5 = 4 laps/min Mary does the most laps /min
December 20, 2016

math
s = 3d d + 3d = 116 4 d = 116 d = 29 so s = 87
December 20, 2016

Math (please help!!)
It is also the incenter B http://www.google.com/search?q=incenter+of+triangle&ie=utf-8&oe=utf-8 and point of concurrency C http://www.google.com/search?q=iconcurrency+of+perpendicular+bisectors&ie=utf-8&oe=utf-8 and D
December 20, 2016

30 to what ?
30deg to horizontal or vertical? In either case, use Snell's law.
December 20, 2016

math
5 per year 5*20 = 100 twenty years
December 20, 2016

history
Clove production, slaves See: www.blackpast.org › Geography: Global African › Africa › KenyaSeyyid Said, also known as Said ibn Sultan, was a resourceful and energetic sultan ... moved the capital from Arabia to Zanzibar in order to initiate clove production...
December 20, 2016

Social Studies
push --> potato famine and nasty bosses drive people out pull ---> jobs and land draw those people as immigrants to Ellis Island.
December 19, 2016

calcululs help me
4x^2+8xy+9y^2-8x-24y+4=0 8xdx+8xdy+8ydx+18ydy-8dx-24dy=0 (8x+18y-24)dy= -(8x+8y-8)dx dy/dx = (-4x-4y+4)/(4x+9y-12)agree numerator = 0 when x+y=1 yes find d/dx(dy/dx)of (-4x-4y+4)/(4x+9y-12) = [(4x+9y-12)(-4dx-4dy)-(-4x-4y+4)(4dx+9dy)]/dx[(4x+9y-12)]^2 =4[(4x+9y-12)(-dx-dy)+(+...
December 19, 2016

chemistry
ZnO + 2HCl ---> ZnCl2 + H2O By the way H2O is ...... Zn = 65 g/mol O = 16 g/mol H = 1 g/mol Cl =35.5 g/mol 13.64 g ZnCl2 * 1 mol/(65+71)g = mols of ZnCl2 now you should be able to continue.
December 19, 2016

American History
I think A) http://millercenter.org/president/biography/monroe-foreign-affairs
December 19, 2016

error !
I multiplied by distance not time average speed = v/2 distance = .25 = t (v/2) t = .5/v then 3 v = 20 *.5/v 3 v^2 =10 v^2 = 10/3 v = sqrt(10/3) ================== check 3 v = 20 * t 3 sqrt (10/3)= 20 * .5/sqrt(10/3) 3 (10/3) = 20 * .5 yes
December 19, 2016

physics
change in momentum = force * time 3 v = 20*.25
December 19, 2016

algebra 2
ticket price p = 231/n p-4.5 = 231/(n+3) 231/n - 4.5 = 231/(n+3) 231(n+3)-4.5(n^2+3n) = 231 n 231*3 -4.5 n^2 - 13.5n = 0 4.5 n^2 + 13.5 n - 693 = 0 n = 11 or -14 so 11 =========================== check 231/11 = 21 231/14 = 16.5 yes, diff = 4.50
December 19, 2016

Physics
In other words unless there was energy input from a explosion on impact or something, no way the big block took off at 4.0 m/s
December 18, 2016

Physics
huh? .5*5 *2.9^2+.5*10*2.1^2 = 43.1 Joules .5*5 *0.9^2 + .5*10* 4^2 = 81.1 81.1-43.1 = 38 Joules more Something exploded :)
December 18, 2016

American History
ah come on !!!!
December 18, 2016

calculus
I assume you mean x^2 - x y - y^2 = 5 2 x dx - x dy -y dx - 2 y dy = 0 (2y-x)dy = (2x-y)dx dy/dx = (2x-y)/(2y-x) slope is undefined (vertical) when 2y-x = 0 or x = 2y so x^2 - x y - y^2 = 5 4y^2 -2y^2-y^2 = 5 y = +/-sqrt 5 then x = +/- 2 sqrt 5
December 17, 2016

calculus
surface area in m^2/radius in meters is meters radians is arc, no units so meters per radian
December 17, 2016

algebra
If any one of those three factors is zero, then the product is zero so z = 0 works z-1 = 0 works so z = 1 works z+3 = 0 works so z = -3 works therefore z = 0 or 1 or -3
December 17, 2016

Algebra 1- Urgent
In your table in part B the ratio is for example 10406.04/10303.01 = 1.01 check: 10303.01/10201 = 1.01 sure enough so that is increasing by ONLY ONE percent per year
December 17, 2016

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