Tuesday

October 13, 2015
Total # Posts: 38,446

**physics**

you have final velocity, but not starting velocity. Cant be determined. If you had starting velociy, you could have avgforce*time=massllet(vi-vf) and the time is distance/avg velocity avgvelocity=(vf+vi)/2 so you have resistive force. for acceleration, a=avgvorce/massbullet ...
*October 12, 2015*

**Chemistry**

Delta H is that heat divided by moles of AgCl formed....you have to calculate that.
*October 12, 2015*

**Physics**

initial KE=1/2 m vi^2 friction energy=force*distance set these equal, and solve for distance. then time: time=distance/avgveloctiy=distance/10/2
*October 12, 2015*

**Physics**

D=21N+87cos31N + 87sin31E figure that out.
*October 12, 2015*

**Physics**

d=3W+3N+6E d=3W+3N-6W d=3N+3E magd=sqrt(3^2+3^2) your teacher is far too easy.
*October 12, 2015*

**Physics**

What is 140*cos15?
*October 12, 2015*

**Chemistry**

More SrNO3 was needed to complete the reaction precipating SrCO3.
*October 11, 2015*

**math**

if all dimensions are 3x, the area is increased by 9.
*October 11, 2015*

**math**

v\4. Solve: 5|2x + 1 | = 55 Divide both side by 5: |2x+1|=11 ###Now subtract 1 from each side ###2x=10 ###Now divide each side by 2 ### x=5 I have no clue what your teacher meant. 2x+1=11 and 2x+1= -1 +1 +1 +1 +1 2x = 12 2x = -10 X=5 x=-6 What my teacher said was wrong~~ 2x+1=...
*October 11, 2015*

**physics**

you are given velocity. acceleration is dv/dt. displacement max will occur when v is zero (it is changing directions). solve for t when v=0. Then use that t in dv/dt=?
*October 10, 2015*

**Math Calculus**

99=L+2PI*radius volume=PI*r^2 * L=PI r^2*(99-2PIr) dv/dr=2PI r (99-2PIr)+PIr^2 *-2pi) set dv/dr=0 and solve for r.
*October 10, 2015*

**Math**

y=1/3 cos(2x-PI) not right. vertical shift is zero.
*October 9, 2015*

**Math**

h is zero when it hits the ground h=50-4.9t^2 t= sqrt (50-h) / 4.9
*October 9, 2015*

**Math**

1. h=50-4.9*1.6^2 no, you are wrong.
*October 9, 2015*

**math**

what is 1/.04 x 1.8?
*October 9, 2015*

**math**

ground speed (x) = 600 +- wind speed then use the formula, Tail wind add wind speed, headwind, subtract.
*October 9, 2015*

**Chemistry**

mass=density*volume = 8.33g/cm^3 ( 4/3 PI (5.7cm)^3 )
*October 9, 2015*

**Calculus**

y=sin (PI/4)-cos(pi/6) y= -.159 check that, I dont see it as an indeterminant form.
*October 9, 2015*

**AP Chemistry**

to decrease O2 is to shift to right or adding more N20, OR removing NO, or removing the heat. or reducing pressure. so decreasing temp works.
*October 8, 2015*

**Math (ASAP)**

the limit of F(X) AS X APPROACHES WHAT?
*October 8, 2015*

**Math**

N+N+2 + n+4+n+6=N 4N+12=n n=-3 which is not an even integer. No solution
*October 8, 2015*

**Physics**

velocity=displacement/time displacement=9.8*11E-1.58*1.2E time=11+6.9+1.2
*October 8, 2015*

**physics**

height=1/2 g*t^2 t=sqrt (2*81/9.8) s
*October 8, 2015*

**Astronomy**

Image result for protoplanets www.universetoday.com Protoplanets are small celestial objects that are the size of a moon or a bit bigger. They are small planets, like an even smaller version of a dwarf planet. Astronomers believe that these objects form during the creation of...
*October 8, 2015*

**methodist math**

-1,-.5,0,.5,1,1.5,2,2.5,.....
*October 8, 2015*

**math**

aLma=ana+6 1/2 (alma-4)<ana-4 1/2 (ana+6 -4)<ana-4 ana+2 < 2ana-8 ana>10 alma>16 check that.
*October 8, 2015*

**Mechanic Science**

question one does not make sense to me. 2) figure time it takes for the first portion vf=vi+at solve for time, vf=15, vi=0 distanceFirst=avgvelocity*time=7.5*time distance Second=avgvelocity*12 and avg velocity for each phase again is 15/2 m/s
*October 8, 2015*

**Physics**

you know horizonal velocity (distance/time). from time in air: in the vertical component... Vf=vi-4.9t^2 -vi*sinTheta=vi*sinTheta-4.9t^2, you know time inair, so solve for vi*sinTheta a) vi*sinTheta=4.9*27.5^2/2 from horizonal velocity b) vi*cosTheta=4.54/27.5 Now, divide a) ...
*October 8, 2015*

**Physics**

I will be happy to critique your work.
*October 6, 2015*

**astronomy**

You can calculate this readily theta=1.22 wavelength/aperture Theta is in radians. Look up the wavelength of light (yellow).
*October 6, 2015*

**Science**

The answers in the Number 2 appear to be listed twice. Recheck them. 5C is correct.
*October 6, 2015*

**physics**

constant speed? acceleration is zero.
*October 6, 2015*

**science**

density=mass/volume=mass/side^3
*October 6, 2015*

**pychology**

see the links below
*October 6, 2015*

**Algebra**

480=2L+2W L-18=W 480=2(18+W) + 2W solve for w, then L, then L x W for area
*October 6, 2015*

**CHECK ANSWERS for geometry**

points and lines have no width, thickness, and a point has no length. Normal space: This is a highly technical definition, I am not certain what your teacher is looking for. Google "Normal Space" for examples. yes, on segment comment.
*October 6, 2015*

**Physics**

vf^2=vi^2+2ad and a=force/mass=mu*mg/m=mu*g solve for vi
*October 6, 2015*

**Scicence**

Isn't it .6m/s per degree Celcius?
*October 6, 2015*

**Maths**

2t+8 >= -4t-1 add 4t+1 to each side 6t+9 >= 0 subtract 9 from each side 6t >= -9 divide each side by six t >= -1.5
*October 6, 2015*

**PHYSICS**

find the force/area. Force from centripetal force by force=v^2/r (change rps to m/s) then, you know the elongation, and the crosssectional area. then solve for Young's modulus.. https://ccrma.stanford.edu/~jos/pasp/Young_s_Modulus_Spring_Constant.html
*October 6, 2015*

**Social Studies**

Go to the head of the class, correct.
*October 5, 2015*

**geometry**

reflection through the line y=x moves (x,y) -> (y,x) So, it looks like C with a typo. I mean, geez, did you try actually plotting a point and seeing what happened if you flipped it over the line y=x? or maybe googling reflections? http://www.regentsprep.org/regents/math/...
*October 5, 2015*

**ela**

How many times do I answer this. If you are using the term plot to mean the body of the narrative, it must be fully developed, this is what keeps readers going.
*October 5, 2015*

**yadlapalli**

What is the area of the circle, minus the area of the traiangle? Now divide that by three. Think on that.
*October 5, 2015*

**English**

I would remove the comma, assuming the nursing home actually toppled over. Odd nursing home,however, the patient was very lucky not to have been killed. Now if it was the patient who toppled over and broke his hip, then the patient, who toppled over and broke his hip, resides ...
*October 4, 2015*

**Chemistry**

The ammoniated iron (Fe(NH4)++) will dissociate from the sulfate iron, and of course the hydrated complex will be standing alone.
*October 4, 2015*

**Chemistry (Le Chatelier's Principal)**

I cannot read your symbols. since it is exothermic, cool the reaction. Increase the concentration of H2 substantually. If you cool the reaction sufficently, the methanol will condense to liquid removing CH3OH vapor, and the reaction will tend to the right. A cayalyst may be ...
*October 4, 2015*

**physics**

VERTICAL SPEED:vi*sin28.9 time in air: vi=vf-4.9t but vf=-vi so t=2vi/4.9=2*vi*sin28.9/4.9 horizontal disance=vicos28.9 *2vi sin28.9/4.9 vi^2=7.7*4.9/2sin28.9*cos28.9 solve for vi.
*October 4, 2015*

**chemistry**

figure the H+ concentration of each 1) H+ =10^-9.75=1.7782794e-10 2) H=10^-9.01=9.7723722e-10 so the difference between these two concentrations is 7.9940928e-10
*October 4, 2015*

**Physics**

looking at the two accelerations, it appears the need to find the angle. vi=5+6j vf=6-5j costheta=vi dot vj / (magvi * magvj) maj vi, mag vf=sqrt(25+36)=sqrt61 vi dot vj=30-30=0 cosTheta=0 theta=90 but v=2PI r/12 v^2=4 PI^2 r^2/144 r=v^2/a=pi^2 r^2/sqrt61 r=sqrt61/pi^2 check ...
*October 4, 2015*

**AP Chemistry**

correct
*October 1, 2015*

**Math**

your answer is 2/3? Not possible that this is the answer on how many outcomes..
*October 1, 2015*

**Maths**

it will be halfway between the roots, or turning point is when tis halfway between 5.1 and 9.1, or t=7.1. Put that into the s equation, and solve.
*October 1, 2015*

**Physics**

zero.
*October 1, 2015*

**Statistics**

show your work. It appears to me you are grazing for answers.
*October 1, 2015*

**History**

The American Government is a three legged tepee in a political wind storm.
*October 1, 2015*

**Statistics**

pr(5)=.41^5*.59^(21-5) are you grazing for answers?
*October 1, 2015*

**Statistics**

EVprofit=.25(-39747)+.2(19759)+.15(59068)+.4(0) Surely you can do this math.
*October 1, 2015*

**Math**

dimensions of the box x high 14-2x width 24-2x height Lord your teacher gave you this. See the volume function. This is an easy problem in calculus. On the graphing calculator, type in the volume function give, and then plot it vs x. Look for the max volume.
*October 1, 2015*

**Physics**

So what is the question? Where is the table?
*October 1, 2015*

**physics**

wondering if the magnets are allowed to move (accelerate)? assuming not, then each is pulling with 3N.
*October 1, 2015*

**Physics**

let h be the place where they meet. Both are in the air for the same time. htop=6.41-8.35t-4.9t^2 hbottom=0+8.35t-4.9t^2 when they hit, htop=hbottom subtract the equations.. 0=6.41-2*835t solve for time t at impact, then put it in either equation and solve for either htop, or ...
*October 1, 2015*

**Pre Algebra**

correct on the first four. On the fifth, do the exponents first 7.2/4.3 x E (-5+3) then the division 1.7E-2 or in standard .017
*October 1, 2015*

**Calculus**

s=t^3-12t v=ds/dt=3t^2-12 a=dv/dt=6t when is velocity 0? v=3t^2-12=0 t^2=4 t=2 and at t=2, a=6*2=12
*September 29, 2015*

**Physics**

first yes; second no
*September 29, 2015*

**what is the defination and example of ethics and m**

it is bad to kill it is wrong to lie, cheat, or steal it is wrong to bare false witness There are ethical beliefs.
*September 29, 2015*

**Chem**

arsenic trihydride, or in the stock system Arsenic(III)hydride yes on 2, in stock system, arsenic(V)fluoride yes, correct, if the HCl is dissolved in water, it is hydrochloric acid.
*September 29, 2015*

**Mv convent**

draw a ray diagram. To see his feet, the base of the mirror must be 1/2 way between the floor and his eyes. if he can see his feet, he can see the base of the wall behind. Now to see the top of the wall behind, the top of the mirror must be 1/2 way up from his eyes to the top ...
*September 29, 2015*

**Chemistry**

As compared to water, the specific gravity is .789
*September 29, 2015*

**english**

When did ancient times occur if not long ago? The brightly colored red flag excited the male bull. The car travaeled on four wheels, the trike on three. The red stuff on McBeth's hands did not wash out of his nightmares when he slept. There is not sense ever of being banal.
*September 29, 2015*

**english**

b. my neice is a ballet dancer...as a member of ... Not parallel construction. c. My neice is ...and I always...and President Obama is ....and the moon is made of green cheese. Dont make compound sentences of disconnected thoughts...
*September 29, 2015*

**english**

short is always better, it reads better, easier to understand, and will be remembered. Can you find the flaws in b and c?
*September 29, 2015*

**maths**

T-5=A A+7=3/4(T+7) do you need more help?
*September 29, 2015*

**science**

The time it takes 1/2 of that type nuclide to disintegrate.
*September 29, 2015*

**thermo**

What is the question? Flow rate?
*September 29, 2015*

**Chemistry**

figure the moles of CaO in 100 g. Multiply that by -81.8 kJ/mol. Notice the negative sign, that means heat is not absorbed. that is the heat given off. notice the amount of CaO is trivial compared to the water, so assume all of the Water does not react, and there is 100g of ...
*September 29, 2015*

**math**

how far apart are the posts? One could build it with four posts, one at each corner.
*September 29, 2015*

**Math**

a^b/a^c= a^(b-c)
*September 29, 2015*

**algebra**

19-3<= L<=19+3
*September 29, 2015*

**Science**

Correction: H2 combines with Cl2 to form hydrogen chloride (gas). Only when dissolved in water does it become hydrochloric acid. C is not correct. Relook at B
*September 29, 2015*

**chem**

Assuming you mean kJ for the reaction based on one mole H2, one mole F2, then molesF2=52/38 heat given off=-542kJ*52/38
*September 29, 2015*

**Statistics (Central Limit Theorem)**

Sorry Stacie. The central limit theorem does apply. Google central limit theorem.
*September 29, 2015*

**St. Louise's Inclusive Secondary School**

From what? Stock solution? Example> assume your stock solution is 12M. so you want to dilute it 12/.5=24 times. That means, one part stock + 23 parts water. Say you want to make 3 liters of the .5 solution. Then one part=3liters/24=you do it. so add one part (3/24 liters) ...
*September 29, 2015*

**Physics Projectile Motion**

time in air: distance/speed=72/36=2s hf=hi-vsinTheta*t-4.9t^2 hf=hi and you know time t, solve for theta
*September 29, 2015*

**physics**

displacement=5km E-4kmE=1kmE
*September 28, 2015*

**Writing**

consider food supply from the sea, water consider impact on recreation industry consider weather changes from atmospheric polution
*September 28, 2015*

**Math**

favor=Pr(w,w,w,w)=2(1/2)^4=1/8 which is 1:7 notice the two in front, you asked for the pr of EITHER team. against: same as 1-prob that it is cleared in six games how to go six games wwwllw wwllww wwlwlw wllwww wlwlww wlwwlw lwwwlw lwwlww lwlwww llwwww the probability of those ...
*September 28, 2015*

**algebra**

what is 1/x^3 ?
*September 28, 2015*

**Physics**

vf=vi+at change that acceleration to m/s^2 -1350mi/hr^2 (1hr/3600sec)^2*1609m/mi =-.167m/s^2 check that.
*September 28, 2015*

**Science**

didn't I just give you the answer?
*September 28, 2015*

**Dependent/independent**

The dependent variable is time to dissolve Independent is type of solute.
*September 28, 2015*

**need to balance equation**

it is balanced.
*September 28, 2015*

**Science**

advantage of physical model: it is somethign one can see, helping understand. advantage of conceptual: it is quick to think out and use. Not complex
*September 28, 2015*

**Science**

gametes.
*September 28, 2015*

**Science PLEASE help!**

theories come before evidence, when strong evidence finally exists, it is law.
*September 28, 2015*

**Chemistry**

if you started with 27 liters, you will get 10/9 x 27 liters of products. of that, NO will be .4*10/9*27 liters and steam will be .6*10/9*27 liters.
*September 28, 2015*

**Science**

it will be to three sig figures. 340 is only two sig figures.
*September 28, 2015*

**Math**

All of them depend on this rule: a^b=1/a^-b and a^-b=1/a^b
*September 28, 2015*

**Physics**

Ak=Cd a'k+ak'=c'd+d'c so errors in c and d add, and any error in A subtracts.
*September 28, 2015*

**math**

s-3=E s+5=2(E+5) solve for s, and e
*September 26, 2015*