Thursday

August 21, 2014

August 21, 2014

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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