Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 17,498

**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.

**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

**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)

**algebra**

point at (0,1) then right 1 and down 4

**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

**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

**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

**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.

**Physics( Explain and choose right answer)**

Like here: http://www.jiskha.com/display.cgi?id=1260400554

**Physics( Explain and choose right answer)**

change in momentum = Force * time m v = force*time You would have to guess force, mass and final speed to approximate time. If you look at some of the problems down below you may find reasonable assumptions to make

**Physics( Explain and choose right answer)**

actually speed rather than velocity because directions are opposite.

**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

**4th grade math**

(3/4)8 = 3 (2) = 6

**History 8th**

Yorktown, Virginia

**Treaty of Paris, quick question, thanks! ☺**

Britain had little choice. That is what it was all about.

**Math**

(24 b/ 10 s) (60 s/ min) (3 min) = 432 b

**math**

1.0/2 = 0.5

**Treaty of Paris, quick question, thanks! ☺**

Sign tied to the rock wall in front of my house says "We miss Bobby"

**Treaty of Paris, quick question, thanks! ☺**

http://www.u-s-history.com/pages/h685.html You from Lanesville ?

**Algebra 1 Answer Evaluation**

that would be -12 try (3c-9)(c+7)

**math**

36/1.5 = 24

**math**

.6 * 7 = 4.2

**Social Studies :)**

as far as I know :)

**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

**Social Studies :)**

Oh, ok

**Social Studies :)**

Hey, both Ms Sue and I responded.

**Social Studies :)**

Alamo was attack on Texas, not United States

**math**

3 * 12 /1.5 = 24

**math**

A = 5 * 7 3/8 = 5 (59/8) = 295/8 = 36 7/8 pounds

**math**

(5/3 mo)(4 wk/mo)(5/6 tank/wk) = 100/18 = 50/9 = 5 5/9 tanks

**math**

2.25 * 5 = 11.24 = 11 1/4 or (9/4)5 = 45/4 = 11 1/4

**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

**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

**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...

**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

**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 (fis...

**math**

6 2/8 + 4 2/8 + 5 3/8 = 15 7/8

**math**

2/6 = 1/3 1/3 * 300 = 100 1/5 * 300 = 60 1/4 * 300 = 75 sum = 235 300 - 235 = 65

**You can not copy and paste here**

If that is what you are trying to do.

**In other words you left out the data**

Then t minutes later, the number of bacteria present will be WHAT ????

**math**

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

**science question?**

You are welcome.

**science question?**

It blows harder and more steadily in some places than others.

**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

**science**

http://wiki.answers.com/Q/What_are_the_differences_between_the_different_types_of_mountains?#slide=23 d

**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

**no idea - do no have chart**

You can not copy and paste here.

**math**

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

**math**

1.25 hr *3600 seconds/hour = = 4,500 seconds

**Algebra!**

You are welcome.

**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 th...

**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...

**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.

**Physics**

That is what the grating is all about !

**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.

**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 ...

**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

**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 atmosp...

**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

**Math HELP!! Who can solve??**

None of those but D/(2z), perhaps B Q L / 200 or A

**physics**

It is hard to tell without the velocity.

**College math**

A + 1.5 A = 18 2.5 A = 18 A = 7.20 B = 10.80

**whoops**

Whoops, sorry, use Steve' result.

**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.

**TO DrBob222 Science**

Less than 7 is acidic.

**TO DrBob222 Science**

http://www.jiskha.com/display.cgi?id=1395270068

**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

**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

**Physics.**

m v^2/r = 1.9 (2.8)^2/2.3 Newtons

**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 se...

**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

**math trig**

a^2 + 100 = 225 a^2 =125 = 25 * 5 a = 5 sqrt 5

**Science URGENT PLEASE**

You are welcome :)

**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/...

**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

**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

**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 <------------

**math**

You are welcome. Good luck !

**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.

**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.

**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

**Phy**

Post once please

**Physics**

Been there, done that

**Algebra ll**

You are welcome :)

**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 wher...

**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 ma...

**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 wh...

**Criminal investigation**

You are welcome :)

**Criminal investigation**

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

**math**

each drives for time t and the sum of their distances is 1080 70 t + 65 t = 1080 135 t = 1080

**math --- check my work!**

You are welcome.

**math --- check my work!**

5. sqrt[804/(4 pi)] = 8 check 4 pi (64)= 804.24

**algebra**

The line over the D multiplies the D(which is 500) by 1000

**algebra**

With a line over the D

**algebra**

I think DMMMCCCIII https://int.darkbyte.ru/503303

**Physics**

I assume your 4.2 meters is vertical component of ramp since you did not give an angle. m g h = 11 * 9.81 * 4.2 = 453 Joules decrease in potential energy That goes in PE of spring (1/2) k x^2 = 453 250 x^2 = 906 x = 1.90 meters due to velocity k x = weight = 11*9.81 x due to w...

**Math**

Sketch a number line and mark the points on it. Then list them from left to right.

**simple physics**

normal force on floor = 750 sin 25 + 9.81 m friction force =.73(750 sin 25 + 9.81 m) so 750cos25 = .73(750 sin 25 + 9.81 m) solve for m

**PHYSICS**

You are welcome. As always, check my arithmetic.

**PHYSICS**

Initial speed = 3 m/s acceleration constant during braking therefore average speed during stop = 3/2 = 1.5 m/s time to stop = t =7 m / 1.5 m/s = 4.67 seconds v = Vi +a t 0 = 3 + a(4.67) a = -0.643 m/s^2 F = m a F = 5 (.643) F = 3.21 Newtons F = mu (weight) 3.21 = mu (5)(9.81) ...

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