Tuesday
February 28, 2017

Posts by Damon

Total # Posts: 29,464

interesting perhaps relevant
I just ran into a story about Neanderthals in Europe which might be relevant :) I hope others can open it: http://blogs.discovermagazine.com/crux/2017/01/24/neanderthals-underrated-genius/?utm_source=SilverpopMailing&utm_medium=email&utm_campaign=News0_DSC_170126_000000_Final%...
January 26, 2017

earlier discussion
http://www.jiskha.com/display.cgi?id=1485466841#1485466841.1485473989
January 26, 2017

Needs attention from Social Science teacher
I tried but not my thing :)
January 26, 2017

social
link: http://www.cartoonstock.com/directory/a/amercians.asp I think you are doing fine with it. The immigrant Europeans are assuming that because they have gunpowder they are more important and valuable. They offer the locals something of no value in return for centuries of ...
January 26, 2017

Physics-Momentum
initial momentum = 1500*15+2500*9 final momentum = -1500*2 + 2500 x initial = final :) 15*15+25*9 = 25x - 30 25 x = 225+30+225 = 480 x = 19.2 =============== check 45,000 = 45,000 ok
January 26, 2017

Math
20 inches/305 feet = 20 inches/3660 inches = 1 inch/183 inches or 1 inch/15.25 ft
January 26, 2017

Trig
You mean for the slope of that line? y = -4x slope = -4 in quadrant 2 x = -1 y = 4 hypotenuse = sqrt(17) sin = 4/sqrt17 cos = -1/sqrt17 tan =-4 in quadrant 4 x = 1 y=-4 h = sqrt 17 again sin = -4/sqrt17 cos = 1/sqrt17 tan = -4 again
January 26, 2017

Math
easier to factor top and bottom that way
January 26, 2017

Math
That is why I wrote 45 not 4.5 and 2700
January 26, 2017

Math
45 inches/2700 miles = .01666.....inch/mile or 5 inches/300 miles or 1 inch / 6 miles :)
January 26, 2017

math
8x + 24 = 8(x+3)
January 26, 2017

Trig
1/cos T = -5 cos T = -1/5 = -0.20 the absolute value is between 0 and 1 so sure, in quadrant two or three about 101 degrees or 360-101 =259 degrees
January 26, 2017

Evaluating algebraic expressions
Hey, draw number lines !
January 26, 2017

Evaluating algebraic expressions
http://www.jiskha.com/display.cgi?id=1485468814
January 26, 2017

Evaluating algebraic expressions
46 > 42 46 is to the right of 42 on your number line. if you move left n units from each, 46 - n is still to the right of 42 - n
January 26, 2017

Math
(4x + 5)(7x + 7) = 28x^2+63x+35 (10x+10)(2x + 6) = 20x^2+80x+60 ---------------subtract---------- 8x^2 -17 x -25 = remaining roof which is (8x-25)(x+1)
January 26, 2017

Math
she doubled speed so took half the time ! half of 50 minutes is 25 minutes
January 26, 2017

Math please check
assume you mean: [ f(4)-f(2) ] / (2) f(x) = x(2-x) if x = 4 4(2-4) = -8 if x = 2 2(2-2) = 0 so we have -8/2 = -4
January 26, 2017

social studies political cartoon
http://www.cartoonstock.com/directory/a/amercians.asp
January 26, 2017

social studies political cartoon
... and then arrogantly named a sport team after them.
January 26, 2017

math
coat = .5m+2 remainder = m -.5m-2 = .5m-2 dress = .5(.5m-2) +3 remainder = .5m-2 -.5(.5m-2)-3=4 .5m-2-.25m+1-3 = 4 .25 m -4 = 4 .25 m = 8 m = 32 ================== now try that coat = 16+2 = 18 left with 32-18 = 14 dress = 7+3 = 10 left with 4 whew !!
January 26, 2017

Applied Calculus
oh, since this is calculus and not physics: d^2h/dt^2 = -9.81 so dh/dt = -9.81 t + constant at t = 0, v = Vi so dh/dt = Vi -9.81 t then h = Vi t -(1/2)9.81 t^2 + constant h = Hi when t = 0 so h = Hi + Vi t -4.9 t^2
January 26, 2017

Applied Calculus
a. Vi = 5 v = Vi - 9.8 t v = zero at top t = 5/9.81 seconds to top b. h = Hi + Vi t -4.9 t^2 = 25+ 5 t - 4.9 t^2 c. 0 = 25 + 5 t - 4.9 t^2 solve quadratic for t use the positive t the negative t is before you threw it :) d. again v = Vi - 9.81 t v = 5 - 9.81*t use t from part ...
January 26, 2017

Trig
cot = 1/tan = cos/sin csc = 1/sin so cot = csc*cos cos = sqrt(1-sin^2) cot = 3.589142*sqrt(1-1/3.589142^2) =3.447019 or 3.45
January 26, 2017

physics
1.38*2pi radians/s = 8.67 8.67^2(.139) = 10.4 m/s^2 or about one g Humm, why not leave it sitting in the collander ?
January 26, 2017

physics
Va^2/140 =Vb^2/295 Va^2/Vb^2 = 140/295 Va/Vb = sqrt(140/295)
January 26, 2017

physics
distance = 2 pi r = 2 pi*2660 meters speed v = 2 pi 2660/200 meters/s Ac = v^2/r
January 26, 2017

Algebra 1
-3x + 2y = +11 +3x - 4y = -19 --------------- add 0 -2 y = -8 y = 4 then -3 x + 8 = 11 3x= -3 x = -1
January 26, 2017

Geography please help
Usually associated with Buddhism but also is part of Hinduism
January 26, 2017

science
one mol of H2S for every 2 mols of HCl 2.56/2 =1.28 That assumes of course that you put in plenty of Na2S
January 26, 2017

MATHS
http://www.purplemath.com/modules/triggrph2.htm
January 26, 2017

Physics
Gave rough beat frequency response below.
January 26, 2017

Social Studies
So I guess "mother of waters". They may not have been familiar with the bleak ocean :)
January 26, 2017

Social Studies
maybe for meaning: http://en.wikipedia.org/wiki/Sarasvati_River
January 26, 2017

Very hard math
.15*75 = 11.25 sure enough
January 26, 2017

Physics
Look mainly at the low "beat" frequency. 4sin96pit + 8(sin 100pit +sin99pit) 4 sin96pit +16 sin100pitcos4pit saying 199/2 is about 100 that is about 4 sin 100 pi t [1+ 4cos 2 pi t] the low beat frequency is max when 2 pi t = 0, 2pi, etc min when 2 pi t = pi/2, pi/2...
January 26, 2017

math.......
distributive property of multiplication price = x tax = 0.05 x which is 5%/100 of x 1 x + .05 x = (1+.05) x = 1.05 x
January 26, 2017

Math (Octants identifying) *emergency*
Like here: http://en.wikipedia.org/wiki/Octant_(solid_geometry)
January 26, 2017

Math (Octants identifying) *emergency*
1,1,1 1,1,-1 1,-1,1 1,-1,1 -1,1,1 -1,1,-1 -1,-1,1 -1,-1,-1 are all in different octants you need the sign of x y and z. They are called octants because there are 8 of them. Draw a picture.
January 26, 2017

physics
say the water is moving in x direction at 4 km/h say we swim in y direction at 3 km/h then our speed is sqrt (3^2+4^2) = 5 km/h tan angle above x axis is tan theta = 3/4 = .75
January 26, 2017

chemistry
1200 mg /200 = 6
January 25, 2017

Physics
if you want the compass angle east of north, it is 90 - that
January 25, 2017

Physics
North 150 cos 60 = 75 km N East 150 sin 60 - 100 = 29.9 km E distance = sqrt(75^2+29.9^2) tan angle north of east = 75/29.9
January 25, 2017

calculus
No need for L'Hopital 16-x^2 = (4-x)(4+x) so you really have: (4-x) at x = -4 4-(-4) = 8
January 25, 2017

enough
You are wasting your time and ours. Please take the course before you try to do the problems.
January 25, 2017

Trigonometry with right triangles
If you were taking geometry, you would be in serious trouble.
January 25, 2017

Trigonometry with right triangles
He did not understand my reply to the last question either. He clearly has not studied the material yet.
January 25, 2017

Some basic concept of chemistry
http://www.lagoonsonline.com/laboratory-articles/normality.htm
January 25, 2017

Physical Sciences
Google diamond. I think you will find that it is pure Carbon, C. The carbon atoms are arranged in a crystal structure under high temp and pressure.
January 25, 2017

Pseudocode
20*1.05 = 21 or do it the hard way 20*1 + .05*20 = 20 + 1 = 21 note use of distributive property to do it fast.
January 25, 2017

geometry
1-s)(1+s) 1-s^2 1-sin^2x = cos^2x cos^2x + cos^2 (sin^2x/cos^2x) = cos^2 x + sin^2 x = 1
January 25, 2017

how far behind?
truck goes 20 t car goes 50 t 50 t - 20 t = distance behind in kilometers resulting t is in hours multiply by 3600 to get seconds
January 25, 2017

math
--- 1 2 3 4 5 6 1========1,4 2 =====2,3 3 ==3,2 4=4,1 5 6 four out of 36 = 1/9 that is one out of every nine so a once b twice c three times d 100/9 = about 11 times e 450/9 = 50 times
January 25, 2017

Math!!!!
You are welcome.
January 25, 2017

Math!!!!
Well, you do not build each piston for each cylinder. You order the piston from the auto parts store for your type of engine. It better be the same size and shape as the old one or it either will not fit the cylinder or the connecting rod or the piston rings.
January 25, 2017

Math!!!!
Ah, pistons in your car engine?
January 25, 2017

Math
links in your bike chain?
January 25, 2017

Geometry/Trig
tan 80 = 18/x so x = 18/tan 80
January 25, 2017

Dating with Radioactivity
I am not geologist but question: 3. Upside down? 4. If there is sand in the granite did the sand not already exist when the granite formed? 5. Not at all sure 7. I suspect rapid burial but read your text about it.
January 25, 2017

Geometry / Trig
well, we need the area of an equilateral triangle with sides of one cm. Then we multiply by six for altitude sin 30 = (1/2)/1 cos 30 = h/1 h=.866 so area of triangle = (1/2)(1)(.866) = .433 then multiply by six 6*.433 = 2.6 cm^2
January 25, 2017

8th grade math /lesson3/functions
Those are all arithmetic sequences above 7. is correct
January 25, 2017

8th grade math /lesson3/functions
up TEN each time 39,49,59
January 25, 2017

8th grade math /lesson3/functions
3*1+5 = 8 3*2+5 = 11 3*3+5 = 14
January 25, 2017

8th grade math /lesson3/functions
In the first one, subtract 8 each time so -2, -10 , -18
January 25, 2017

math
0.60 x = 372 so x = 372/0.60 = 3720/6
January 25, 2017

Science
Way too much H2 H2O = 2 + 16 = 18 grams/mol that is 16 g/mol of O so 8 g is 1/2 mol of O H2 is 2 g/mol so 5g is 2.6 mol, more than we need so we end up with 1/2 mol of water which is 9 grams
January 25, 2017

CHECK answers science
Yes. I might argue about #3 because Thompson's "plum pudding" model was pretty crude compared to Rutherford's model, but Thomson did have sub atomic particles.
January 25, 2017

error
last two lines d = 4.9 t^2 = 2.33 meters
January 24, 2017

physics
average speed passing window = -2 meters/.25 s = -8 ms constant acceleration = -9.81 m/s so while crossing the window v = Vi -.981t change in v while crossing window = -9.81*.25 = -2.4525 m/s half that = -1.23 m/s so v at window top = -8+1.23 = -6.77 m/s so how far did it fall...
January 24, 2017

Physics
but then 1 second * initial speed + (1/2)(4)t^2
January 24, 2017

Specify a Period on the graph
see question below this one.
January 24, 2017

Calculus
when is 5 pi x = 2 pi ???? x = 2/5
January 24, 2017

Math
8+8 + x+x = 26 2 x = 10 x = 5 but you have a typo no doubt I bet the perimeter is 260 yards.
January 24, 2017

physics
Law #1 momentum of passenger continues forward until acted upon by windshield or other force.
January 24, 2017

physics
Well, lots of things can happen but what you can count on is conservation of momentum of the overall runner, tackler, ground system. Any forces from the ground on the people can change the momentum of the merged runner-tackler system. If they were both on ice and ran into each...
January 24, 2017

Math
4 2/3 = 14/3 divide by 5 14/15
January 24, 2017

Calculus
If it is a horizontal line the slope is zero. y = a constant (y-y1)/(x-x1) = 0 y - y1 = 0 y = y1 put in the given y y = -9
January 24, 2017

Yoruba
If you just want the word for sun: http://www.wordhippo.com/what-is/the/yoruba-word-for-22fa6121da96f43a106e413e65d4f9089c53824c.html
January 23, 2017

Geometry
http://www.calculatorsoup.com/calculators/geometry-solids/cone.php
January 23, 2017

Geometry
do not do that Lillylove volume of sphere = (4/3)pi r^3
January 23, 2017

School
oh my, schools, unions, Planned Parenthood .....
January 23, 2017

School
Yes, I bet she was very busy. http://democracywise.syr.edu/?p=3939
January 23, 2017

School
I do not see anything written about her in the last couple of days, but judging by her history in government I bet she had a very busy weekend, perhaps in Washington.
January 23, 2017

School
Councilor at large, Syracuse, NY ? Google her name
January 23, 2017

Math
You are welcome.
January 23, 2017

Math
60% of them :) .6*70 = 6*7 = 42
January 23, 2017

algebra
should look like 11 x^2 - 28 x -480 = 0 (11x+60)(x-8) = 0
January 23, 2017

you try first
This time you try first and show work. Same method.
January 23, 2017

math
aaarrrrggh too many of these, use: http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html
January 23, 2017

author?
Try to google story "knife" LOL
January 23, 2017

math
straight up and down, (Y2-Y1)/(x2-x1) = (Y2-Y1)/ 0 undefined
January 23, 2017

math
compounds 24 times a year so r = .03/24 = 0.00125 per period 25 years = 25*24 = 600 periods A = 10,000 * 1.00125^600 = 10,000 * 2.116008731 = $21,160.09
January 23, 2017

Science
6 volt battery resistance of 8 ohms I assume the resistors are also in series i = 6/8 = 3/4 = 0.75 amps
January 23, 2017

algebra
x^2 + (x+6)^2 = (x+12)^2 x^2+ x^2+ 12 x + 36 = x^2 +24 x +144 x^2 - 12 x - 108 = 0 108 is 6*18 for example (x-18)(x+6) = 0 try x = 18 then x+6 = 24 and x+12 = 30 ===================== check 18^2 + 24^2 = 30^2 ???????? 324 + 576 = 900 whew !
January 23, 2017

Ethics
Actually from a maximum utility benefit/cost point of view, I should think B would be the winner.
January 23, 2017

Geometry
length scale = 4/17 area scale = 4^2/17^2 = 16/289 vol scale = 4^3/17^3 = 64/4913 x^3/y^3 = 1728/343 volume ratio x^2/y^2 = 576/y^2 area ratio x/y =(1728/343)^(1/3) = 5.0379^(1/3) = 1.7143 length ratio so x^2/y^2 = 1.7143^2 = 2.939 so 2.939 = 576/y^2 y^2 = 196 meters^2
January 23, 2017

Geometry help
You are welcome.
January 23, 2017

Geometry help
for anything with a pointed top and straight sides the volume = area of base * height *(1/3) so here the side^2*h is the same for each 14^2*24 = s^2*96 or 14^2/s^2 = 4 14/s = 2 s = 7
January 23, 2017

Geometry help
12*12*(9/12) = 108 ft^3 there are 3*3*3 = 27 ft^3/yd^3 108/27 = 4 cubic yards 4*54 = $216
January 23, 2017

Chemistry
Did the vapor pressure of this liquid change when you squeezed the gas down? I think not. Therefore the pressure did not change. You have half as many gas molecules above the fluid. Half the gas molecules condensed back into liquid form.
January 23, 2017

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