Saturday
December 10, 2016

Posts by Damon

Total # Posts: 28,460

English
2. Choose the meaning of the bold word. Failing that, I could have SURREPTITIOUSLY dumped the whole outfit overboard, written off the forty or so dollars as love’s tribute. (“The Bass, the River, and Sheila Mant") happily*** slyly ##################### ...
September 27, 2016

math
first person does 1/60 job/min second does 1/90 job/min together they do 1/60 + 1/90 = 3/180 + 2/180 = 5/180 job/min so (5/180)t = 1 job t = 180/5 = 36 minutes
September 27, 2016

Physics
ride speed = 20 m/50 s = .4 m/s total speed = .4 + .5 = .9 t = d/speed = 20/.9 = 200/9 = 22.2 seconds part b speed = .5 - .4 = .1 20/.1 = 200 seconds
September 27, 2016

Physics
u = 50 cos A Vi = 50 sin A 240 = u t = 50 t cos A so t, time in air, = 24/(5cosA) time rising = t/2 = 12/(5 cos A) v = Vi - g t rising 0 = 50 sin A - 9.81(12)/(5 cos A) 250 sin A cos A = 9.81(12) now use trig to get angle A for second part you have two values of Vi = 50 sin T ...
September 27, 2016

Math
weeks = days/7
September 26, 2016

Math
5*15 does not work either :)
September 26, 2016

Math
32-17 = 15 w = 17*5 + 15*6 by the way I bet they mean centimeters not millimeters.
September 26, 2016

physics
46 N
September 25, 2016

maths
5(x+iy)(x-iy)+3(x+iy -x +iy) =42-15i 5x^2+5y^2 + 6iy = 42-15i 5 x^2 + 5 y^2 = 42 6 i y = -15i y = -15/6 5 x^2 + 5 (225/36) = 42
September 25, 2016

Physics
kinetic energy at planet surface = potential energy at max height (1/2) m v^2 = m g h h = v^2/2g so if g is g earth/6 then the height is h earth * 6
September 24, 2016

Science
http://www.jiskha.com/display.cgi?id=1474739216
September 24, 2016

Math
combinations of 9 taken 3 at a time = 9!/[ (9-3)!(3!)] = 9*8*7/(3*2) = 3*4*7 = 12*7 = 84
September 23, 2016

Physics
g force down slope = mg sin phi friction force up slope = mu mg cos phi a = F/m = g sin phi - mu g cos phi = g (sin phi - mu cos phi)
September 23, 2016

Physics
To raise something to a power please use ^ symbol To divide please use / symbol work done = kinetic energy gained = (1/2)mv^2 power = work done/time = (1/2) m v^2 t = m v^2 /(2t)
September 23, 2016

Physics
average speed = .568/2 = .284 m/s time = t = .389/.284 = 1.37 seconds a = change in speed / change in time = .568/1.37 = .415 m/s^2 F = m a = 79.5*.415 = 33 Newtons
September 23, 2016

Physics
Well, yes but it was the change in POTENTIAL energy m g h. The velocity is assumed negligible.
September 23, 2016

Physics
400*9.81 = 3924 Newton weight I guess the mechanic is also on the ground?mechanical advantage needed = 3924/250 = 15.7 since pulleys do not come in fractions we will need 16 times 16*3 = 48 meters
September 23, 2016

Physics
+i +j +k -5 -3 -4 +0 +1 +0 = 5 k + 4 i or 4i +0j +5k (note obviously perpendicular to j so no j component)
September 23, 2016

Social studies
I would claim horses. Try: http://latinamericanhistory.about.com/od/theconquest/a/09armsconquest.htm
September 23, 2016

Social Studies
no, please read what I said.
September 23, 2016

Social Studies
Native to Brazil. Portuguese brought it to West Africa.
September 23, 2016

Engineering Math
x = Xi e^-kt .41 = e^-120k ln.41 = -120 k k = .00743 .5 = e^-.00743 t ln.5 = -.00743 t t= 93.3 daya so I pretty much agree with you .77 = e^-.00743 t t = 35.2 days
September 23, 2016

Math
You are welcome.
September 23, 2016

Math
|-13| = +13 which is not -13
September 23, 2016

Social studies NEED HELP
What does your book say? Does it discuss the Portuguese going east around Africa to the Indian Ocean and East Indies? Does it mention that other European countries might want to find another way to get there and that Columbus thought he could get to the East Indies by sailing ...
September 23, 2016

algebra
a + (n-1)d .5 + (n-1).5
September 23, 2016

algebra
http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html
September 23, 2016

algebra
.5 , 1 , 1.5 , 2.0 , 2.5 is .5 , 1.5 3.0 , 5.0, 7.5 on day 5 of course this is an arithmetic sequence with d = .5
September 23, 2016

physics
assume you mean 10^7 and 10^-16 etc How long to move 35*10^-3 m ? t = 35*10^-3/1.9*10^7 so t = 18.4 * 10^-10 seconds a = F/m = 6*10^-16 / 9.11*10^-31 = .659 * 10^15 m/s^2 d = (1/2) a t^2 = (1/2)(.659*10^15)(339*10^-20) = 112*10^-5 = .00112 meters or 1.12 mm
September 23, 2016

Math
n-1 , n , n+1 4(n-1)-13 = n+1 4 n - 4 - 13 = n+1 3 n = 18 n = 6 5, 6, 7
September 23, 2016

Social Studys
How about "no taxation without representation" ?
September 21, 2016

jay
P/2 = L+w w = P/2 - L
September 21, 2016

jay
A = h (a+b)/2 2 A/h = a + b a = 2A/h - b
September 21, 2016

equation is wrong !
h(a+b)/2 not times 2 average base times height, common sense
September 21, 2016

Math
use 4y-6 for x y = 4 - 3 (4y-6) y = 4 - 12 y + 18 13 y = 22 y = 22/13 x = 4(22/13) - 6 x = 88/13 - 78/13 x = 10/13
September 21, 2016

Math
I think you mean 12 grams and 40% 12 = .4 x so x = 12/.4
September 21, 2016

Science
How about mountain ranges for example ?
September 21, 2016

Algebra
I knew the slope m so I used y = m x + b I put in 2 for x and -3 for y that is the point (2,-3) -3 = (1/3)(2) + b
September 21, 2016

Algebra
slope = m = (-4+3)/(-1-2) = -1/-3 = 1/3 -3 = (1/3)(2) + b b = -9/3 - 2/3 = -11/3 y = (1/3) x -11/3 3 y = x - 11 x -3 y = 11
September 21, 2016

PHYSICS
yf = yo + vo t + (1/2) a t^2 yf = 0 yo = unknown vo = 0 (dropped not thrown) vf irrelevant ( = a t) a = -4.9 indeed t = 3.5 so 0 = yo + 0 -4.9 (3.5)^2 or yo = 4.9 (3.5)^2
September 21, 2016

statistics
http://davidmlane.com/hyperstat/z_table.html
September 21, 2016

Science
Huh? v = a t so a = 15/10 = 1.5 m/s^2 not 2.5 m/s^2 Something is wrong with the problem statement.
September 20, 2016

Math
(4 km/cm)(4 cm) = 16 km
September 20, 2016

science
water is neutral lime juice and HCl are acidic NaOH is basic
September 20, 2016

Chemistry
What do you think? Imagine doing this and measuring how much is in the beaker by the lines on the side.
September 20, 2016

physic
so the increase in speed of the dropped one cancels the slow down of the other and height = initial speed up * time = 20*3 = 60
September 20, 2016

World History
I would say the competent leadership, perhaps B
September 19, 2016

science
m g = 200 * 5 Newtons work = PE = m g h = 200 * 5 * 1 Joules work/time=power = 200 * 5 * 1 / 100 Joules/second or Watts
September 19, 2016

Algebra
well, I think I would multiply the first one by three and the second one by two 15 x + 12 y = -42 6 x + 12 y = 12 ------------------ subtract 9 x = -54 or x = -6 then -18 + 6 y = 6 6 y = 24 y = 4 (-6 , 4 )
September 19, 2016

Influential Ideas and Events Quiz( Check Answers)
Those were my choices as opposed to your choices. The First Amendment one I feel strongly about though :) The Bill of Rights starts off with freedom of speech, the very first thing.
September 19, 2016

my guesses
d) people who live together under a sovereign government c) It mediates conflicts and supports international projects b) self-reliance c) The leader of Britain is chosen by the legislature (Parliament) (Prime Minister) First Amendment!!!! Congress will make no law abridging ...
September 19, 2016

math
4 c + 2 h = 78 c+h = 35 so 2h = 70-2c 4 c + 70 - 2c = 78 2 c = 8 c = 4 35 - 4 = 31 hens
September 19, 2016

Algebra 2
fifth root of n = n^(1/5)
September 19, 2016

Algebra 2
x^(3/5) i^2 = -1 i^3 = -i i^4 = 1 i^5 = i i^6 = -1 i^7 = -i i^8 = 1 note pattern i^64 = 1 and i^63 = -i
September 19, 2016

physics
the center of gravity moves up 1.5 meters m g h = 20 * 9.81 * 1.5
September 19, 2016

maths help me
energy/second: mgh + (1/2) m v^2 where m = mass/second what is mass/second? m = 1000 kg/m^3 * pi (.05^2)m^2 * 50 m/s
September 19, 2016

physics
1000 * 9.81 * Vol = 25-15 = 10 N so Vol is about .001 m^3 25/.001 = 25,000 N/m^3 or about 2500 kg/m^3 or about 2.5 times that of water
September 19, 2016

Physics
h = 20 t - 4.9 t^2 15 = 20 t -4.9 t^2 4.9 t^2 -20 t + 15 = 0 solve quadratic for two values of t little t on the way up big t on the way down
September 18, 2016

Physics
acceleration F = m A dF/dt = m dA/dt (unless the mass changes:)
September 18, 2016

Maths
2 km + (3/8)j + (1/2)j = 1 j 2km = (8/8 - 4/8 - 3/8)j 2 km = j/8 j = 16 km total you do the rest now :)
September 18, 2016

Math
n + n+1 = 2n + 1 2n is even the next one is odd :)
September 18, 2016

Math
.41 L + .21 (8-L)= 2.08 .41 L + 1.68 - .21 L = 2.08 .20 L = .40 L = 2 p = 8-L = 6
September 18, 2016

Math
x-4 + x-2 + x + x+2 + x+4 = 50 5 x = 50 x = 10
September 18, 2016

Math
n-2 + n + n+2 = 3 n which you can divide by 3 :) It does not matter that they are odd
September 18, 2016

Use parentheses
I do not know what you mean x^3 + 1/(1/x^3) or what you said which is x^3 + 1 + 1/x^3 ???? if the first multiply top and bottom of second term by x^3 x^3 + x^3/1 = 2x^3
September 18, 2016

whoops, go with Reiny
I missed that this is a binomial distribution problem. The combinations are not equally likely.
September 18, 2016

Math
easier grid for me h -> 0 1 2 3 4 t -> 4 3 2 1 0 I see five possible outcomes of which 2 work so I get 2/5 HHTT is the same here as TTHH or HTTH
September 18, 2016

Physical Science
work = force * distance in direction of force 310 = force * 1.5 force = 310 J/1.5 m = 207 Newtons
September 18, 2016

Math
10 a + 5 s = 1700 so s = 340 - 2 a s+a = 270 340 - 2a + a = 270 a = 340-270 a = 70
September 18, 2016

Physics
v = a t = 2.46 t x = -10 + (1.23) t^2
September 18, 2016

Math
15 + .25 t = 20 +.05 t .20 t = 5 t = 25
September 18, 2016

science
4*12+10 = 58 grams/mol 14.17/58 = .244 mol 2C4H10 + 13 O2 ---> 10H2O + 8 CO2 mols CO2 produced = .244(8/2)=.977 mol 2*12+16 = 40 grams/mol 40 g/mol * .977 mol = 39.1 grams
September 18, 2016

Math
t = 4 c t+c = 360 5 c= 360 c = 72 t = 288
September 18, 2016

calculus and chemistry
T = Ts + (To-Ts)e^-(kt) Ts = T surrounding = 10 To = initial T = 160 60 = 10 +(150)e^-(5k) e^-(5k) = .333333 -5k = -1.1 k = .22 so 20 = 10 + 150 e^-.22t e^-.22 t = .0666666 .22t = 2.71 t = 12.3 min 12.3 - 5 = 7.3 min more
September 18, 2016

Maths
r = triangle leg = 20 so is the base 20 so equilateral so 60/360 = 1/6 of circle (1/6)2 pi r =(1/3)pi 20 = 20.94 cm
September 18, 2016

Physics
work done = loss of ke = (1/2)m v^2 = 1000*625 Joules power = work/second = 1000 * 625 / 5 Watts
September 18, 2016

Integrated Math
correct
September 18, 2016

messed up link
http://en.wikipedia.org/wiki/Galileo%27s_Leaning_Tower_of_Pisa_experiment
September 18, 2016

physics
The weight does not matter (Google Galileo, http://en.wikipedia.org/wiki/Galileo%27s_Leaning_Tower_of_Pisa_experiment) about 9.81 m/s^2
September 18, 2016

scince
10 log base ten of power ratio or in this case 10 log 20 about 13 dB If by "intensity" the question means amplitude rather than power then it is 20 log or about 26 dB
September 18, 2016

Physics
http://www.bbc.com/news/business-27021610
September 17, 2016

Physics
a = change in velocity/change in time = (-10 - 10)/5 = -20/5 = -4 m/s^2 v = vi + a t at t = 2 v = 10 -4*2 = 2 m/s at t = 3 v = 10 -4*3 = -2 m/s
September 17, 2016

PRE-CAL
yes, about 55 years 10% doubles in about 7 years :)
September 17, 2016

Physics (Mechanics)
straight up I guess (1/2) m v^2 = m g h h = 22^2/(2*9.81) total height = .8 + h
September 17, 2016

physics
m g h = 5.2 * 9.81 * 3.1 Joules
September 17, 2016

physics
(12)(15)(8.7)^2
September 17, 2016

physics
m g h
September 17, 2016

physics
W = F d 307 = F (1.1)
September 17, 2016

Science
500 *4 = fulcrum force * 1.5 fulcrum force = 500 *4/1.5 force up = fulcrum force force down = 500 + bolt force- so bolt force = fulcrum force - 500
September 17, 2016

linear programming
Oh, forgot the y<8 constraint
September 16, 2016

I did one yesterday
I did one of these for him yesterday.
September 16, 2016

HISTORY
Meanwhile I am wondering if the slaves bought one way or round trip tickets.
September 16, 2016

What are your answers ?
I bet you can get some of these if you really try. Post your answers and if you are wrong I suspect you will hear about it.
September 16, 2016

Social Studies
I disagree.
September 16, 2016

linear programming
well do it. graph the two lines in the first quadrant. y = -(5/9)x + 10 must be above and right points (0,10) and (18,0) y = -(9/8)x + 18 must be below and left points (0,18) and (16,0) intersection at (72*8/41 , -64*5/41 + 10) which is about (14,2) at 0,18 --> 126 at (14,2...
September 16, 2016

Math
8 (50 +4) = 8*50 + 8*4 = 400 + 32 = 432
September 15, 2016

Math, number and operations base
8*1000 + 5*100 + 17*10 + 12 *1 = 8*1000 + 5*100 + 1*100 +7 *10 + 1*10 + 2 = 8*000 + 6*100 +8*10 + 2 = 8682 agree :)
September 15, 2016

Please help with Algebra 2 Ms. Sue
sure, why not slope AB = -2/-6 = 1/3 slope AC = -8/-4 = 2 slope BC = -6/2 = - 3 oh! AB is perpendicular to BC ! slope AB = -1/slope BC
September 15, 2016

maths need help
http://www.wolframalpha.com/input/?i=derivative+x%5E(e%5E3x)%5Ex+
September 15, 2016

need to know takeoff speed
Then use conservation of momentum
September 15, 2016

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