Thursday

April 24, 2014

April 24, 2014

Total # Posts: 35,107

**geometry**

go back an reread what I just posted.

**science!**

weight and height of what? how is the force being measured? Does clear skin and height affect love?

**History8**

http://en.wikipedia.org/wiki/Mason%E2%80%93Dixon_line

**math**

This makes no sense to me.

**History8**

d

**geometry**

given 1/3 PI r^2 * h=180 then 1/3 PI (3r)^2*(3h)=? 1/2 pi r^2 h * 27=27*180

**Algebra**

192=32*6

**physics**

the sum of the heats gained is zero. Heat gained by cup+heatgained coffee=0 .240ccup*(84-27)+.200*cwater*(84-96)=0 put in the value for thespecifice heat of water (cwater), solve for ccup.

**math**

What is 99? what is 36? What is 18? qhat is 72? want more?

**Math: Compass Bearings**

Dcos123=3.5 solve for D

**physics**

the force is increased, so it gets into a tighter circle.

**DNA**

same

**Chemistry URGENT/DR BOB**

10^12.2

**GEOGRAPHY 9**

http://en.wikipedia.org/wiki/Sakoku_Edict_of_1635

**Physics**

distancestudent=3*time + 10 distancebus=1/2 .5 *time^2 set them equal, if she catches the bus.. 3t+10=t^2/4 t^2-12t+40=0 t=(12+-sqrt(144-160))/2 notice the sqrt of a negative term...means the solution cannot be real, she does not catch the bus, except in imaginary time.

**English Composition**

I wonder if it is the "friends" who your parents distrust... Maybe bringing them home might not be the best idea, if in fact they are ....hmmmm...not the kind of kids a parent wants their daughter running with. Drugs? Sex? Alcohol? Swayed by peers? Idiots? That link ...

**geometry**

One wonders where point D is.

**physics**

power wasted: I^2 * resistance Assuming the actual power used by the oven is 6kw, then voltage=6000/26 volts percent power wasted= powerwasted/(6kw+powerwasted) * 100

**math**

the sum of the angles in a triangle is 180 degrees. A+3A+8A=180 12A=180 A=15 B=3A=45 deg

**Algebra**

perpendicula line slope= -1 y=-x+b and at -7,1 1=7+b or b=-6 equation of perpendcular then is y= -x-6

**Calculus Help and Check**

first: correct, also x/5)- ln(x^3)+C second 2x^2+x^3+3x^4+8x+Cx + K f(o)=2=k or K=2 f(1)=10=2+1+3+8+C +2 means C=10-16=-6 >>>f(x)=2x^2+x^3+3x^4+8x -6x + 2 f'= 4x + 3x^2 +12x^3 + 2 f"= 4+6x + 36x^2

**math 117**

upward? f(x)=x^2+5+6

**Physics**

of you divide the volume of water/min by the areas, you immediately know the velocities in the inlet and outlet pipes. Assume the inlet pressure is atmospheric, use Bernoulli's equation then to find outlet pressure. You are given the two heights.

**Physics**

work going into trampolene= avg force*distance= avgF*x that equals the stored enrgy 1/2 kx^2 avgF=1/2 kx

**Physics**

1. wrong equation. Hookes law: force=mg=kx 2. force*distance=1/2 kx^2 Now really, think on that, it gives you half the force on part 1. But because force is linear, from zero to max, it makes sense that the average force then is half the max force, kx. Avg force=1/2 kx

**Physics**

first weight mg(h+x)=1/2 kx^2 so you got a negative and positive answer? WEll, the weights increased the length of h, so the positive answer is what you want.

**Algebra**

get a common denominator... 2a now add the numerators Put the numerators over the common denominator. Reduce the fraction. I will be happy to check your work

**Algebra 1**

4P+5p=2.00 3P+4p=1.58 P= cost of a Pencil p=cost of a pen

**Physic**

use the law of continuity to figure the speed downstram speeddownstream=speedupstream*areaupstream/areadownstream where area means cross sectional area. Now, use Bernoulli's law to figure pressure downstream http://www.4physics.com/phy_demo/Bernoulli/Bernoulli.html because...

**physical**

a. well, beats are result of either a freq of 440+-4, but it is low, so f=436hz you know half wavelength = 59.1cm you know mass per length. You do not know wave velocity on the string. Use http://hyperphysics.phy-astr.gsu.edu/hbase/waves/string.html solve for wave velocity fir...

**chemistry**

I would call this a reduction of iron (reduction means it gained electrons)

**Chemistry**

pv=nRT solve for n, total moles, then subtract the moles of hydrogen present.

**alg**

FOIL it. remember i^2=-1

**science**

without a figure, go figure.

**physics**

Using the Bessel equation estimate theta= 1.22 wavlength/diameter but for small angles, theta=separation/distance so distance=separation*diameter/ 1.22*wavelength which is about= 4.4E11*1.03/1.22*550E-9 =about 4E18/6= .7E18m check my math, you do it more accurately.

**Psychology**

Many people think so. A few object. How can this be answered? If a male child, say age 7, thinks he is a girl, only wears "girl" clothes, keeps his hair long and neat, likes to pay attention to clothes matching, identifies on the toy aisles liking the "girl"...

**Psychology**

the Psychology/Biological basis of behavior? the combination of biological, social, and psychological forces experienced in life? I bet I could write twenty answers which are correct.

**Algebra 1**

h=-16x^2+100x=x(100-16x) when is h zero? answer, when x= 100/16, and x=0 IT is a parabola, so the max apex is at 1/2 the time between the zeroes, or at time= 100/32 use that x to find max height in the original formula.

**Algebra**

6300=x + Y .11x + .08y=597 cna you take if from here?

**TO ANY SCIENCE HELPER**

It depends entirely on the problem. I don't have a clue what you are trying to figure out.

**English Composition**

and kid is still young and has not developed keen judgement of others, or self.

**Physics 1**

in what time? torque=MomentInertiadisk*changew/time

**6th grade math**

I can much help making a graph on this. distance = speed*time, so on a distance time graph, you will have a sloping line upwards..

**Physics 1**

same density. Ok, roll them down a slight incline. They will have different moments of inertia, so the hollow one will have more inertia,so it will lag behind the solid ball. http://hyperphysics.phy-astr.gsu.edu/hbase/imgmec/mic.gif

**Physics 1**

Is the Earth Rotating? net torque means it is accelerating...

**Physics**

net force=mass*acceleration Now the issue is what is net force: Net force=pulling force-friction friction is easy to figure (m*mu*g) so exactly what is the pulling force? Not given. Not known.

**Physics**

I have not a clue what the problem is. What is the relationship of the vault to the car?

**biology 6**

http://www.sciencedaily.com/articles/c/convergent_evolution.htm

**physic II**

average KE= constant*abaolute temp average KE= (273+40)/(273+20) but KE is proportional to v^2 so velocity has increased by sqrt above.

**physics**

it has to gain sufficent force to rise which equals the weight of the height of the water. We will calculate in gauge pressure... pressure=force/area= density*area*height*g/area= density*g*height height = 26m density= 1.04E6kg/m^3 g= 9.8N/kg so calcualate pressure, it ought to...

**Language Arts**

From my experience, you are correct. A.

**Alg**

d=65ft=.04v^2+.05v put this into quadratic form, and use the quadratic equation, solve for v.

**Personal Finance**

He probably is solving for future value, however, one needs to think always in present value.

**Physics please help?????**

Honestly, I dont get the picture.

**national academy physics**

distance= 3000m displacement=0

**justin**

what is 145*130 divided by 65? Is it 300?

**Math/Physics**

John distance=20*time Jane distance=15*time+1/2 a time^2 set them equal, solve for time then solve for either distance in that time.

**Math**

12/25 * 10/14 * 7/18 I see a 7 which can go into 14 I see 5 which can go into 10 and 25 12/5 * 2/2 * 1/18 Now, I see six goes into 12 and 18, so 2/5 * 2/2 * 1/3 2/5 * 1 * 1/3=2/15 check all that.

**Math**

time upriver=distance/(S-2) time downriver= distance/(s+2) 8hours=79.2 ( 1/(s-2) + 1/(s+2)) a bit of algebra, but get a common denominator on the right (s^2-4), 8hours=79.2 ( s+2 + s-2)/s^2-4 then combine, put it in quadratic form, and solve for s.

**science**

the centripetal force from rotating is exactly equal and opposite to gravity: net force is zero.

**Geometry**

COSINE was originally written "co.sine," short for COMPLEMENTI SINUS: the sine of the complement. The COSINE of angle AOB is the sine of the complementary angle (ABO ). So Your question states it wrong. COMPLEMENTI SINUS does not mean the complement of the sine, it m...

**science**

angular velocity at all point is 2pi/day linear velocity=angular velocity*radius*cosLatitude

**physics**

A shout down a well produces an echo in 2.00 seconds. How deep is the surface of the water in the well? Assume the speed of sound to be 343 m/s. distance=time*speedsound solve for distance. Then, well depth is one half distance.

**english**

I love it. I remember doing that in eighth grade English, my teacher was not amused. I remember she gave words in patterns of ten. She learned finally to change her instructions from "Write a sentence using each of these words in context" to something more legalistic...

**physics**

This is a most flawed problem. Perhaps the author has a different understanding of friction than I.

**physic II**

Perfect gas? Nitrogen? You have to be kidding. PV=nRT 1atm*2liters=n*R*273 solve for n, thenumbe of moles. Watch what units of R you use atm, liters... mass of the gas=n*molemassN2

**Physics**

ignoring air friction, the acceleration of the ball is due to gravity, always pointed downward.

**PHYSICS**

The image is 4.4 m from the dog. b. rate relative to the dog, or surroundings? Relative to the dog, .56m/s, relative to wall, .28m/s

**Written Communication**

Have you ever assembled a lego village? Carved a piece of wood? Put on a pair of pants when dizzy? Been in a carwreck?

**Chemistry**

each Al xfers three electrons, six total donated Br each atom accepts one, for a total of six accepted.

**physics**

It is not reasonable to assume conservation of energy. There is not enough information to do this without the conservation of energy.

**physics**

YOu are given mass/length. You are given half wavlength length of 6.9m, and 20 m. wire 1 has a third harmonic wavelength of 30 m. First overtone of wire2 has a wavlength of 2*6.9m

**physics**

I will be happy to critique your thinking. Giving you the answers is less appealing to me.

**physics**

massdeficit=energy/speedlight convert MeV to joules first.

**trying to understand math**

How many shifts do each of you work per week?

**Science**

Desolate?

**CALCULUS**

Can you sketch the curves?

**Physics**

on each nail? 75*g/10,000mm^2 want it in N/m^2? 75g/10,000mm^2 * (1mm/.001m)^2

**algebra**

what help do you need with this? I will be happy to critique your work.

**alegebra**

see other post

**Algebra**

In my head: Sam can do two houses in 12 hours, Pat can do one. Toghter, 3 houses in 12 hours, or 4 hours per house.. formulary: total houses=rate*time 1 house=((1house/6hours) + (1 house/12hours) * time 1 = ((2+1)/12)time time = 12/3 hours

**Biology**

1. http://en.wikipedia.org/wiki/Follicle-stimulating_hormone#Effects_in_males 2. https://www.inkling.com/read/guyton-hall-textbook-of-medical-physiology-12th/chapter-80/testosterone-and-other-male-sex 3. https://www.google.com/search?q=human+chromosomes&client=firefox-a&hs=HBQ...

**Energy multiple choice question**

specific heat=heat/(mass*deltaTemp) a. c=13000/100*1= 130J/kg*K b. c=1050/.050*5=1050/.25=4000J/kg*K c. c=2340/2*3=amost 400J/kgK check my work.

**Physics**

the sum the heats gained is zero. heat1+heat2=0 5*c*(Tf-10)+1*c*(tf-40)=0 c divides out, solve for Tf tf(5+1)=50+40 tf= 90/6=15C

**art 101**

What does a shadow indicate?

**physics**

Use either Biot Savart Law, or Amperes law: the magnetic field is related to the current enclosed....

**math**

a. Are you guessing? Start with the range, it eliminates in a mental calculation very rapidly your choice. b. start with the outliner, clearly 39. that means answer H, or I. Then if you remove the ouliner, the mean has to be lower, of H, I the lowest mean is H. Answer H. Many,...

**math**

sale price= .8(cost*1.40) profit= sale price-cost price. b. if sale price=.8(cost*1.40) then cost= sale/(.8*1.40) and profit=sale-sale/(.8cost*1.40)

**Social Studies**

water, of course

**Pre cal**

y=sin(x-PI) reflecting it, y=-sin(x-PI)

**Math**

team average? hits/at bats.

**Physics**

2PI/360deg * 222deg

**chemistry**

you want to dilute it 2.88/1.03 =2.796times, which means 1 part original, 1.796 parts water. what is 1 part? 1 Part= 250ml/2.796=89.4 ml original solution, then 250-89.4 ml water. Stir, label.

**MATH**

what do you think?

**algebra**

Is there a question here?

**math**

8g^7h^-3 /2g^4h^8 4* g^(7-4)*h^(-3-8)=4g^3h^-11=4g^3/h^11

**math help**

remember that a^b *a^c/a^d= a^(b+c-d) ? 8x^7y^4/(2x^3y^2)= 4 (x^(7-3))(y^(4-2))

**Chemistry**

I dont think so....the water was initially hotter, and putting cold lead in made it hotter? I don't think so. Recheck.

**Chemistry**

formula? The concept is the closed container gains no heat from outside, so the sum of the heats gained is zero (one gains, one loses). Heatgaindlead+heatgainedwater=0 2.85g*clead*(Tf-10.3C)+7.55g*cwater*(Tf-52.3)=0 look up the two specific heats (watch units, your mass is in ...

**Physics**

tangential linear speed= angular speed*radius=4.2 rad/s*12cm= ... centripetal acceleration= v^2/radius= w^2*radius= 4.2^2 * 12cm/s^2

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