Thursday
August 21, 2014

Posts by Damon


Total # Posts: 17,967

Phys
10 = x * 1.6*10^-19 10 * 10^19 = 1.6 x x = 6.25 * 10^19 well, quite a few, but less than a mol (6*10^23)
March 25, 2014

Physics
Been there, done that scroll down .
March 25, 2014

Physics
well if you started out with everything neutral and one got negative then the other got positive (the rod stole electrons from the wool, becoming negative. That left the wool with an excess of protons, becoming positive)
March 25, 2014

physics
tan Theta = 50/100 Theta = 26.6 degrees
March 25, 2014

math
1 kilogram = 1000 grams so we have 1000 + 600 = 1,600 grams or 1.6 kilograms
March 25, 2014

math
the hour hand moves from 6 to 7 in one hour It will not be half way between until 6:30 So it is still closer to 6
March 25, 2014

Oh - I bet this is the problem
http://www.jiskha.com/display.cgi?id=1360959210
March 25, 2014

math
If the state department of transportation says so, we are supposed to believe it.
March 25, 2014

Trig Identities
If hypotenuse is 1 opposite = sin T adjacent = cos T 1^2 = (sin T) ^2 + (cos T)^2 as we know and sin^2 T = 1 - cos^2 T sin T = +/- sqrt (1-cos^2 T) well, that is not much of an identity if the sign is arbitrary. BUT if we use the negative root then we know that cos^2 T is ...
March 25, 2014

Algebra
L = w+5 2 L + 2 w = 66 or L + w = 33 so w + 5 + w = 33 2 w = 28 w = 14 etc
March 25, 2014

chemistry
yes 1 Ba , 2 H , 2 O
March 25, 2014

Oh, sorry
I did not read carefully.
March 25, 2014

chemistry
Google it eg http://www.webqc.org/balance.php?reaction=BAO+%2B+H2O+%3D+BA%28OH%292
March 25, 2014

physics 1
Hey, wait a minute. If there were no gravity it would have taken less time to stop. The total force up including gravity = change of momentum so there is no change to the force in part b due to gravity.
March 25, 2014

physics 1
force = rate of change of momentum = 88.1*3.53 / .00356 = 87,358 N = 88.1*3.53/.199 = 1,563 N with gravity add 88.1*9.81 = 864 N
March 25, 2014

Geometry
x = (-2 + -3) /2 = -5/2 = -2.5 y = (1+2)/2 = 1.5 so ( -2.5 , 1.5 ) (which you could see on a quick sketch)
March 25, 2014

algebra
point at (0,1) then right 1 and down 4
March 25, 2014

Physics
gain in energy = m g h = 1.2 * 9.81 * 34.2 = 403 Joules 403 = (1/2) m v^2 + (1/2)I omega^2 I = m r^2 = 1.2 (.09) = .108 omega = v/r = v/0.3 so 403 = (1/2)(1.2)(v^2) +(1/2)(.108)(v^2)/.09 403 = v^2 ( .6 + .583) v = 18.5 m/s I agree with you
March 25, 2014

physics
initial momentum = 1000 m final momentum = 910(m-1,000) + 10^7 90 m = .091*10^7 + 10^7 = 1.091*10^7 m = 121,222 kg
March 25, 2014

algebra
(x-0)(x-7)(x+4)(x-5) = 0 (x^2 -7x)(x^2-x -20) = 0 x^2(x^2-x-20)-7x(x^2-x -20) = x^4 -x^3 - 20 x^2 - 7x^3 + 7x^2 + 140 x = x^4 - 8 x^3 - 13 x^2 + 140 x
March 24, 2014

Physics( Explain and choose right answer)
The tension is smallest at the top, if the speed is in fact enough to make the top without the tension going to zero. At top: Tension + m g = m v^2/R tension = m (v^2/R - g) if the centripetal acceleration is not greater than g, the rope goes slack.
March 24, 2014

Physics( Explain and choose right answer)
actually speed rather than velocity because directions are opposite.
March 24, 2014

Physics( Explain and choose right answer)
initial momentum = 0 so final momentum = 0 0 = 3*Vcat + 1.5*Vcardboard so Vcardboard = 3 Vcat/1.5 = 2 Vcat
March 24, 2014

4th grade math
(3/4)8 = 3 (2) = 6
March 24, 2014

History 8th
Yorktown, Virginia
March 24, 2014

Treaty of Paris, quick question, thanks! ☺
Britain had little choice. That is what it was all about.
March 24, 2014

Math
(24 b/ 10 s) (60 s/ min) (3 min) = 432 b
March 24, 2014

math
1.0/2 = 0.5
March 24, 2014

Treaty of Paris, quick question, thanks! ☺
Sign tied to the rock wall in front of my house says "We miss Bobby"
March 24, 2014

Treaty of Paris, quick question, thanks! ☺
http://www.u-s-history.com/pages/h685.html You from Lanesville ?
March 24, 2014

Algebra 1 Answer Evaluation
that would be -12 try (3c-9)(c+7)
March 24, 2014

math
36/1.5 = 24
March 24, 2014

math
.6 * 7 = 4.2
March 24, 2014

Social Studies :)
as far as I know :)
March 24, 2014

Social Studies :)
4. Manifest Destiny 5. Not Harvard. They joined the women at Rackliffe a few years ago. 7. Oregon 10. Taylor at Rio Grande border. Alamo was attack on Texas, not US 11. Gadsden Purchase for railroad
March 24, 2014

Social Studies :)
Oh, ok
March 24, 2014

Social Studies :)
Hey, both Ms Sue and I responded.
March 24, 2014

Social Studies :)
Alamo was attack on Texas, not United States
March 24, 2014

math
3 * 12 /1.5 = 24
March 24, 2014

math
A = 5 * 7 3/8 = 5 (59/8) = 295/8 = 36 7/8 pounds
March 24, 2014

math
(5/3 mo)(4 wk/mo)(5/6 tank/wk) = 100/18 = 50/9 = 5 5/9 tanks
March 24, 2014

math
2.25 * 5 = 11.24 = 11 1/4 or (9/4)5 = 45/4 = 11 1/4
March 24, 2014

math
3 * (4/6) + 2 * (3/4) + 4 * (3/5) = 2 + 3/2 + 12/5 = 20/10 + 15/10 + 24/10 59/10 = 5.9 hours = 5 hours 54 minutes
March 24, 2014

Algebra
as x ---> 6 the denominator becomes zero on the right it is + oo (like 6.001 / .001) and on the left of x = 6 it is -oo (like 5.999 /-.001 as x gets large positive it is 1 as x gets large negative it is 1
March 24, 2014

Physics
C + O2 ---> Co2 gas and heat (combustion) Heat of vaporization + water ---> steam under pressure Expanding steam ---> kinetic energy of H2O molecules passing blades and moving them blades turn hub, torque * angular speed is rotational mechanical energy Moving coils in...
March 24, 2014

Precalculus
h = -.4 t + b 24.8 = -.4(13) + b b = 30 so h = -.4 t + 30 h(7) = -.4(7)+30 = 27.2 cm
March 24, 2014

science question?
* jobs created in building, maintaining and managing the facility. * energy money saved by residents and businesses is available for investment. however there can be negatives * negative impact on view and tourist income * negative impact on industries that need the space (...
March 24, 2014

math
6 2/8 + 4 2/8 + 5 3/8 = 15 7/8
March 24, 2014

math
2/6 = 1/3 1/3 * 300 = 100 1/5 * 300 = 60 1/4 * 300 = 75 sum = 235 300 - 235 = 65
March 24, 2014

You can not copy and paste here
If that is what you are trying to do.
March 24, 2014

In other words you left out the data
Then t minutes later, the number of bacteria present will be WHAT ????
March 24, 2014

math
been there, done that: http://www.jiskha.com/display.cgi?id=1395685293
March 24, 2014

science question?
You are welcome.
March 24, 2014

science question?
It blows harder and more steadily in some places than others.
March 24, 2014

MATH
so 1/4 in fourth and 1/4 in fifth grade 1 = 2/5 * 400 = 2 * 80 = 160 grade 2 = 2/8 * 400 = 2 * 50 = 100 grade 3 = 1/10 *400 = 1 * 40 = 40 grade 4 = 1/8 * 400 = 1 * 50 = 100 grade 5 = 1/8 * 400 = 1 * 50 = 100 grade 2 is 2/8 which is 1/4 by the way, sme as grades 4 and 5
March 24, 2014

science
http://wiki.answers.com/Q/What_are_the_differences_between_the_different_types_of_mountains?#slide=23 d
March 24, 2014

math
WEEK # COLLECTED FRACTION OF GOAL 1 1/2 = 250 2 1/5 = 100 3 1/4 = 125 total collected = 475 so 500 - 475 = 25 left to goal CLASS 2 WEEK # COLLECTED FRACTION OF GOAL 1 2/5 = 200 2 1/10 = 50 3 1/5 = 100 total collected = 350 so 500 - 350 = 150 left to goal
March 24, 2014

no idea - do no have chart
You can not copy and paste here.
March 24, 2014

math
food = 10,000 bev = 4,000 dec = 2,500 ent = 2,500 sum = 19,000 so 1,000 is left for staff
March 24, 2014

math
1.25 hr *3600 seconds/hour = = 4,500 seconds
March 24, 2014

Algebra!
You are welcome.
March 24, 2014

Algebra!
What is the solution of x^2+14x+112=0? If necessary, round to the nearest hundredth. (1 point) x = [ -14 +/-sqrt(196 -448) ]/2 x = -7 +/- (7.94)i A box shaped like a rectangular prism has a height of 17 in and a volume of 2,720 in^3 The length is 4 inches greater than twice ...
March 24, 2014

Algebra!
What is the value of n so that the expression x^2+11x+n is a perfect square trinomial? (1 point) x^2 + 11x + (5.5)^2 (x+5.5)^2 = x^2 + 11 x + 30.25 What is a solution of x^2+6x=-5? (1 point) x^2 + 6 x + 5 = 0 x = [ - 6 +/- sqrt (36-20) ]/2 x = -3 +/- 2 x = -5 or -1 What is the...
March 24, 2014

trig
sin T = 714/1000 so csc T =1/sin T= 1000/714 = 500/357 tan T = 714/700 = 102/100= 51/50 cos T = 7/10 You have them right but mislabeled.
March 24, 2014

Physics
That is what the grating is all about !
March 22, 2014

college physics 2
yes For the same m (lambda) for smaller d, you need BIGGER theta so the peaks on the target will be further apart as d shrinks.
March 22, 2014

college physics 2
The first off center maximum occurs when the path lengths to the screen from the two slits differs by one wavelength. If you move the slits closer together, the angle to the screen must increase to get path lengths a wavelength different. Therefore is you decrease the spacing ...
March 22, 2014

TO: DrBob222 science
Search with Google. For example: type hydrocyanic acid resulting first link is: https://www.google.com/search?q=hydrocyanic+acid+formula&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a&channel=sb yields instantly HCN
March 20, 2014

physics
the metal was moving in the direction the gas was pushing. That is positive work. As for the first part, figure out how many mols of water vapor you have and how many mols of air, Then do PV = nRT to get partial pressures of each. That final pressure inside is ten times ...
March 20, 2014

math 1 question pls help!!!!!
I think since it is similar everything changed by 1/2 and the new volume is 1/8 times the old 240/8 = 30 ft^3
March 20, 2014

Math HELP!! Who can solve??
None of those but D/(2z), perhaps B Q L / 200 or A
March 20, 2014

physics
It is hard to tell without the velocity.
March 20, 2014

College math
A + 1.5 A = 18 2.5 A = 18 A = 7.20 B = 10.80
March 20, 2014

whoops
Whoops, sorry, use Steve' result.
March 20, 2014

calculus
integral = -(2t-5)/(t^2-5)^2 at infinity ---> -2t/t^2 = 2/t = 0 at 6 = (5-2)/31^2 = .00312 It does not diverge but has a finite answer. If t = sqrt(5) were included, we would have had a problem with a zero denominator.
March 20, 2014

TO DrBob222 Science
Less than 7 is acidic.
March 20, 2014

TO DrBob222 Science
http://www.jiskha.com/display.cgi?id=1395270068
March 20, 2014

Math help understand
They both travel for time t = 3 hours the bike goes: d = 15 t the bus goes d + 195 = v t so d = v t - 195 but t = 3 so 15(3) = v(3) - 195 45 = 3 v - 195 3 v = 240 v = 80 km/h
March 20, 2014

Physics
Ac = v^2/r F = m Ac = m v^2/r = 80 (3.2^2)/2.4 = 341 N = 340 N to two figures
March 19, 2014

Physics.
m v^2/r = 1.9 (2.8)^2/2.3 Newtons
March 19, 2014

Math
20 things could happen in the two tosses for example D1 first then D2 or Q1 or Q2 or Q3 or D2 first then D1, Q1 Q2 Q3 or Q1 first then D1 D2 Q2 Q3 . . etc Both quarters out of the 20 I see 6 so 6/20 = 0.3 both dimes I see 2 out of the 20 or 0.1 both dimes or both quarters I ...
March 19, 2014

geometry
1 rev is distance of pi D so pi D feet/9 minutes = speed in feet/min .495 mi/h * 5280 ft/mi * 1 h/60 min = 43.56 feet/min SO pi D/9 = 43.56 D = 9 (43.56)/pi or D = 125 feet
March 19, 2014

math trig
a^2 + 100 = 225 a^2 =125 = 25 * 5 a = 5 sqrt 5
March 19, 2014

Science URGENT PLEASE
You are welcome :)
March 19, 2014

Science URGENT PLEASE
1. sour, acid <7 2. H+ and O-2 sort of H3O+ and O-2 is another way to look at it 2 b H O H because that is shape of molecule 2 c same number of 2 H+1 as O-2 3 a H+ up 3 b beats me, why should it change? 3 c OH- up, what else is new? 4 http://facultyfp.salisbury.edu/dfrieck/...
March 19, 2014

math trig
cos/(1+sin) + (1+sin)/cos cos^2/[ cos(1+sin) ] +(1+sin)^2 /[cos(1+sin)] (cos^2 + 1 + 2 sin + sin^2)/[cos(1+sin)] but cos^2 + sin^2 = 1 ( 2 + 2 sin) /[cos(1+sin)] 2 (1+sin)/[cos(1+sin)] 2/cos which is 2 sec
March 19, 2014

algebra
Jim - 13 = Tom Jim + Tom = 75 Jim + (Jim - 13) = 75 2 Jim - 13 + 75 2 Jim = 88 so Jim = 44 Tom = Jim-13 = 31
March 19, 2014

math
-220 = 360 - 220 = 140 which is 180 - 40 which is 40 degrees above the -x axis in quadrant 2 tan and cot are negative in Q2 tan 40 = .839 so cot 40 = 1/.839 = 1.19 BUT it is negative so -1.19 <------------
March 19, 2014

math
You are welcome. Good luck !
March 19, 2014

math
I do not think it is. If you put them over a common denominator it is easy. If you use your calculator to look at them as decimals it is really, really easy.
March 19, 2014

Science question, only 1
I think we would starve because no plants would grow but maybe die from no conversion of CO2 to C and O2 without photosynthesis first.
March 19, 2014

Physics
total mass = .5 + .005 = .505 kg potential energy = m g h = .505*9.81*.08 = .396 Joules that is Ke at bottom (1/2) (.505) v^2 = .396 v = 1.25 m/s momentum = m v = .505 * 1.25 = .633 kg m/s
March 19, 2014

Phy
Post once please
March 19, 2014

Physics
Been there, done that
March 19, 2014

Algebra ll
You are welcome :)
March 19, 2014

Algebra ll
simple yearly interest rate i (percent = 100 i) at n = 1 first year beginning Amount = A second year Amount = A + Ai Third year Amount = A + 2 A i This is an arithmetic sequence with A = starting amount A i = d so Amount = A + d (n-1) recursive Amount n = Amount (n-1) + d ...
March 19, 2014

Math (algebra)
V = pi r^2 h = 500 so h = 500/(pi r^2) area of side = 2 pi r h area of top and bottom togethr = 2 (pi r^2) =2 pi r^2 cost = C = .11(2 pi r^2) +.06(2 pi r h) C = .22 pi r^2 + .12 pi r [500/(pi r^2)] C = .22 pi r^2 + 60/r C = .691 r^2 + 60/r I need to use calculus to find the ...
March 19, 2014

Math (algebra)
Area = x y A = x (36 - x^2) = 36 x - x^3 domain is 0 </= x </= 6 assuming that it has to be on the POSITIVE x axis( the function would work fine for negative x but you specified + x) for largest I have to use calculus dA/dx = 0 at max = 36 -3 x^2 x^2 = 12 x = 2 sqrt 3 ...
March 19, 2014

Criminal investigation
You are welcome :)
March 19, 2014

Criminal investigation
Joe the slasher, who has disposed of 14 people so far who squealed on him to the cops, might resent your testimony.
March 19, 2014

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