Friday

January 30, 2015

January 30, 2015

Total # Posts: 788

**physics**

20 kg , 30 cm diameter disk is spinning at 300 rpm. How much friction force must be applied to rim to bring the disk to a halt in 3.0s?
*December 15, 2010*

**calculus**

The moment of inertia about the pole(origin) of the plane region which is inside the cardiod: r = 1 + cosO and outside the circle r =1. It's mass density is equal to it's distance from the pole..... I need someone who is way smarter than me to help with this one... ...
*December 8, 2010*

**Math**

The mass of the solid inside the sphere: x^2+y^2+z^2=1, above the xy plane and below the cone z=SqRT(x^2 + y^2. It's mass density is equal to the square of a distance from the origin, setup in both spherical and cylindrical coordinates. I don't have to evaluate, but i ...
*December 8, 2010*

**chemisty**

how many grams of Na are needed to react with H2O to liberate 400mL of H2 gas at STP?
*December 8, 2010*

**Math**

Use lagrange multipliers to find the point on the plane x-2y 3z-14=0 that is closet to the origin?(try and minimize the square of the distance of a point (x,y,z) to the origin subject to the constraint that is on the plane) Help me please!
*December 7, 2010*

**8th grade math**

.10*(1/2)x+.25x = 9.00 x(.10*(1/2)+.25)= 9.00 x= 9.00 ___(.10*(1/2)+.25) x = 30 Since you times the dimes by 1/2, you take half of x. So Dimes = 15, and Quarters = 30 Check, .10(15)+ .25(30) = 9.00
*December 7, 2010*

**Singing**

I am having a total meltdown.... I want to sing, but my voice is too low! HELP!!
*December 6, 2010*

**spanish**

You are good. Nothing to add. Good job!
*December 6, 2010*

**Chemistry**

What volumes of 0.46 M HNO2 and 0.54 M NaNO2 must be mixed to prepare 1.00 L of a solution buffered at pH = 3.40? a) HNO2 b) NaNO2 answer in L
*December 5, 2010*

**Chemistry**

How many moles of NaOH must be added to 1.0 L of 1.4 M HC2H3O2 to produce a solution buffered at each pH? (a) pH = pKa mol (b) pH = 3.07 mol (c) pH = 5.15 mol
*December 5, 2010*

**Physics**

a 55 kg skateboarder starts out with a speed of 1.8 m/s. he does +80 J of work on himself by pushing with his feet against the ground. in addition, the friction does -265 J of work on him. in both cases, the forces doing the work are nonconservative. the final speed of the ...
*December 4, 2010*

**math**

how do I rewrite using the distributive property 3^2 + (9-3) 3 x (24/8) + 2
*December 1, 2010*

**EXP105: Personal Dimensions of Education (ABA1047G**

Identify at least two skills that you that you would like to improve. Provide details on what actions you will do to develop each skill. Who do you consider to be a part of your personal support system? How do they offer support and encouragement to you?
*December 1, 2010*

**science**

how much energy is required to raise 5 kg of silver 36 degrees celcius with a specific heat of 234 j/kg degrees celcius
*November 30, 2010*

**Geometry**

1. How many sides does a regular polygon have if one exterior angle is 90 degrees? 3 4 5 6 2. The measures of three angles of a quadrilateral are 80, 90, and 103 degrees. Find the measure of the fourth angle. 67 77 87 97 3. The sum of the interior angles of a 7-gon is 900 1,...
*November 30, 2010*

**geometry**

1. An exterior angle of a regular polygon measures 30 degrees. What is the measure of an interior angle? 30 60 120 150 2. How many degrees are in each interior angle of a regular pentagon? 50 72 108 120 3. If all of the diagonals are drawn from a vertex of a hexagon, how many...
*November 30, 2010*

**math**

draw an rectangle that has an area of 12sq.in and a perimeter that is greater than 25in.?
*November 29, 2010*

**Fine Art**

Keystone questions? Hit me up. justintime5492 at yaahoo
*November 29, 2010*

**chemistry**

How many liters of 0.250 M HCl would be required to react completely with 7.50 grams of magnesium hydroxide?
*November 28, 2010*

**college**

If I combined 25.0 grams of aluminum hydroxide with 75.0 mL of 0.500 M HNO3 how many grams of aluminum hydroxide would be formed?
*November 28, 2010*

**Chemistry**

1. State specifically how you would make a conclusive test for an iron (III) salt. 2. Which test for iron (II) ions is conclusive. 3. Suppose you have a solution containing both an iron (II) salt and an iron (III) salt. How would you proceed to identify both Fe2+ and Fe3+ in ...
*November 28, 2010*

**Chemistry**

1. State specifically how you would make a conclusive test for an iron (III) salt. 2. Which test for iron (II) ions is conclusive. 3. Suppose you have a solution containing both an iron (II) salt and an iron (III) salt. How would you proceed to identify both Fe2+ and Fe3+ in ...
*November 28, 2010*

**chemistry**

A 0.20 M sodium chlorobenzoate (NaC7H4ClO2) solution has a pH of 8.65. Calculate the pH of a 0.19 M chlorobenzoic acid (HC7H4ClO2) solution.
*November 28, 2010*

**chemistry**

Calculate the pH of 3.9 10-8 M HNO3.
*November 28, 2010*

**chemistry**

Calculate the pH of a 5.20 10-3 M solution of H2SO4.
*November 28, 2010*

**chemistry**

What mass of KOH is necessary to prepare 799.9 mL of a solution having a pH = 11.68?
*November 28, 2010*

**chemistry**

You have 100.7 g of saccharin, a sugar substitute, and you want to prepare a pH = 5.80 solution. What volume of solution can be prepared? For saccharin (HC7H4NSO3), pKa = 11.70 (pKa = −log Ka).
*November 28, 2010*

**Precalculus**

1. What quadrant would the terminal side of the angle of t=4pie/3 be? 2. What quadrant would the terminal side of the angle of t=3pie/2
*November 22, 2010*

**physics**

A 2 kg mass on a horizontal friction-free air track is accelerated by a string attached to a 115 kg mass hanging vertically from a pulley as shown. Compare the accelerations when the masses are interchanged, that is, for the case where the 115 kg mass dangles over the pulley, ...
*November 19, 2010*

**biology**

u sure?
*November 18, 2010*

**biology**

Why can maintaining homeostasis be particularly challenging for multicellular organisms?
*November 18, 2010*

**HELP**

How did the Indian reeducation movement affect young Native Americans?
*November 17, 2010*

**physical science**

In the cabin of a jetliner that travels at 600 km/h, a pillow drops from an overhead rack into your lap below. Since the jetliner is moving so fast, why doesn't the pillow slam into the rear compartment of the plane? What is the horizontal speed of the pillow relative to ...
*November 15, 2010*

**Chemistry**

A compound has the empirical formula CHCl. A 256 mL flask, at 373 K and 750. torr, contains 0.800 g of the gaseous compound. Give the molecular formula.
*November 6, 2010*

**Chemistry**

Air bags are activated when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. This causes sodium azide (NaN3) to decompose explosively according to the following reaction. 2 NaN3(s) 2 Na(s) + 3 N2(g) What mass of NaN3(s) must be ...
*November 6, 2010*

**Physics**

1. A stroboscopic photo of a club hitting a golf ball, such as the photo shown in Figure 6.3, was made by Harold Edgerton in 1933. The ball was initially at rest, and the club was shown to be in contact with the club for about 0.0022 s. Also, the ball was found to end up with ...
*November 6, 2010*

**Discrete Math**

7.A group has 9 women and 7 men. d. Suppose 2 members of the group refuse to work together. How many subgroups of 5 can be chosen 8. In how many ways can 16 people be seated: a. In a row, if 4 of the 16 do not want to sit next to one another b. In a row, if 3 of the 16 must be...
*November 4, 2010*

**Discrete Math**

7.A group has 9 women and 7 men. d. Suppose 2 members of the group refuse to work together. How many subgroups of 5 can be chosen 8. In how many ways can 16 people be seated: a. In a row, if 4 of the 16 do not want to sit next to one another b. In a row, if 3 of the 16 must be...
*November 4, 2010*

**Math**

How do you solve: (-2t)^2(3t^7)^2
*October 31, 2010*

**Math**

If the sides of a square are lengthened by 7cm, the area becomes 121cm2. Find the length of a side of the original square.
*October 31, 2010*

**chemistry**

What volume of 0.0482 M Ba(OH)2 is required to neutralize exactly 16.10 mL of 0.141 M H3PO4? Phosphoric acid contains three acidic hydrogens.
*October 28, 2010*

**chemistry**

Calculate the sodium ion concentration when 72.5 mL of 4.4 M sodium carbonate is added to 32.6 mL of 2.5 M sodium bicarbonate.
*October 27, 2010*

**physics**

need some help, A ball with an initial angular velocity of 20.0 rads /s and a rotational inertia of 0.4kgm rolls uphill with an acceleration of -4.00 rad/s . Calculate the net torque acting on the ball. Calculate the angular displacement after 5.00 s.
*October 18, 2010*

**physics**

really confused, A 2kg box is sliding east at 50m/s on a frictionless floor when it collides with a 4kg box sliding east at 10m/s. After the collision, the 2 kg box is sliding east at 20m/s and the 4kg block is sliding east at 25m/s. Calculate the coefficient of restitution. ...
*October 16, 2010*

**Math**

Solve each equation by factoring: (2x+1)(3x-2)=10 How do you get -4/3 and 3/2 out of this equation? I'm so confused
*October 12, 2010*

**Algebra**

Solve the equation by factoring: 6y^2+7y-3=-12y^2-54y+4 The answers are suppose to be -7/2, 1/9
*October 12, 2010*

**physics**

A boy walks a total distance of 210 km due North. His starting position is at 20 km and his final position is 34 km. If it takes him 3 hours and 20 minutes to make his trip, what is his velocity? What is his speed?
*October 6, 2010*

**Physics**

A skateboarder shoots off a ramp with velocity of 6.5 m/s directed at a 59 degree angle. The end of the ramp is 1.3m above the ground. a)How high above the ground is the highest point that the skateboarder reaches? b) When the skateboarder reaches the highest point, how far is...
*October 5, 2010*

**6th grade**

if you had between 3 and 100 shells and counted by 3's, 4's and 5's and had 2 left over each time how many shells would you have
*September 29, 2010*

**5th grade**

The statment means that the elements that form the salt are completely different when they aren't formed into salt. For example, when the element A, B, C are put together they can form salt, but when if you just looked at A it would be different from the salt because it ...
*September 27, 2010*

**social studies**

two examples of lines of lattitudes which can be found on a map?
*September 25, 2010*

**college physics**

A 78-kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.2 m/s in 0.74 s. The elevator travels with this constant speed for 5.0 s, undergoes a uniform negative acceleration for 1.8 s, and then comes to rest...
*September 21, 2010*

**ethics**

What is virtue and how do we acquire it? this is according to aristotle
*September 20, 2010*

**science**

on myth busters there was a,project "people escaping from jail using real hair,toilet paper,and sheets i need the independent,dependent,and control variable on each
*September 19, 2010*

**science**

i need the independent,dependent ,control group variable on a cat always landing on their feet
*September 19, 2010*

**music**

health ins is so you can go to the dr or hospital and wont cost as much as self pay,,disability ins is if you get injured your still covered even if your not working,,life ins is so your funeral arragment will be paid for and tour family wont be struggling with bills after ...
*September 19, 2010*

**ethics**

what does kant mean by a good will without qualification?
*September 13, 2010*

**algebra**

How big is the solution set for an equation that cannot be solved
*September 9, 2010*

**math**

a fireman stood on the middle step of a ladder, shooting water into a burning building, as the smoke lessened, he climbed up 3 steps, and continued his work, the fire got worse, so he had to go down 5 steps, later he climbed up the last 6 steps and was at the top of the ladder...
*September 5, 2010*

**math**

danny has a money market account with $1,200. the bank offered him a special rate of 5.25% per month. how much money will danny have after the first month
*August 5, 2010*

**college differential equations**

Find two linearly independent power series solutions to the diffrential equation. State the first 3 therms of each series: 2x^2y''+xy'-(1+2x^2)y=0
*July 28, 2010*

**algebra**

Oh hey im taking algebra.
*June 3, 2010*

**calculus**

Sorry for the misunderstanding. The X is a multiplication sign and the 4 is multiplied to the cubed root of 3.
*May 23, 2010*

**calculus**

Write the complex number -4 x 3^1/3 - 4i in exponential form. I'm not sure how I use euler's formula to solve for this. A brief explanation would be greatly appreciated.
*May 23, 2010*

**Math**

Which of the following conditions does not ensure that a quadrilateral is a parallelogram? A) Both pairs of opposite sides are parallel. B) The diagonals bisect each other. C) A pair of opposite angles are congruent. D) All of the above Can anyone tell me if C is the right ...
*May 23, 2010*

**Math/Albebra**

Give the equation of the circle with the given center and radius. Center at (0, 0); radius = 5
*May 16, 2010*

**U.S. and Global Economics**

(This homework question was removed due to a copyright claim submitted by K12 Inc.)
*May 13, 2010*

**human growth and developmnet**

it is stupid
*May 12, 2010*

**Intro to visual business**

What specific visual film techniques do you see utilized in contemporary television?
*May 10, 2010*

**Chemistry**

Itz Balanced.
*May 3, 2010*

**CHEMISTRYYY**

consider the following reaction: Mg(s)+ 2HCl(aq) --> MgCl2 (aq)+H2 (g) What minimum amount of 1.75 M HCl is necessary to produce 27.5 L of H2 at STP?
*April 26, 2010*

**Chemistry!**

a)consider the following reaction: Mg(s)+ 2HCl(aq) --> MgCl2 (aq)+H2 (g) What minimum amount of 1.75 M HCl is necessary to produce 27.5 L of H2 at STP? b) What is the freezing point of an aqueous solution that boils at 102.1 C?
*April 26, 2010*

**Chemistry**

What is the freezing point of an aqueous solution that boils at 102.1 C?
*April 26, 2010*

**algebra**

I was wondering what the answer to this is. (x-7)3 3 means it is cubed i workedit out but i was wondering what it might be.
*April 20, 2010*

**Math**

Factor each expression completely. Can you please show me the steps for these. I'm so confused and don't know how to do them. Thank you so much!! kx^3+2kx^2-63kx and 3xz^2+42xyz+99xy^2
*April 16, 2010*

**math**

this year Ben is 4/7 as old Glen. Fifteen years fromnow Ben will be 3/4 as old as Glen. At that time he sum of thier ages will be 63. How old are Ben and Glen now?
*April 16, 2010*

**math**

15over51 in simplest form
*April 16, 2010*

**6th grade**

perplexed,mystifiedor puzzled
*April 15, 2010*

**science, 7th,6th,8th,9th grade**

Less time, less people to operate machines, and less cost to company due to training the different people to manage the job.
*April 15, 2010*

**Chemistry**

i dont think u can draw on this website lol
*April 14, 2010*

**uhh help**

oh ok well im about to go to sleep i didnt notice my comment was so rude i was just speakin my mind if u did take it to offence i am sorry :(..
*April 14, 2010*

**confuseddddd**

how come these comments keep earasing???0_confused
*April 14, 2010*

**uhh help**

yea i kinda was is just that im in a rush and wanna get this booklet done lol >-< ___
*April 14, 2010*

**uhh help**

the legendary king midas was a: a.very beautiful b.very rich man c.very wise man d.very brave man i choose c??
*April 14, 2010*

**help plz:)**

ok so if its not d or b then its eathier a or c correct haha soo i say c lucky guess?>what do u think lmao
*April 14, 2010*

**help plz:)**

im sorry i meant to say b lol
*April 14, 2010*

**help plz:)**

which statement does NOT describe how greek words entered english? a.they have been formed by combining greek elements. b.they have come indirectly by way of latin. c.they have come indirectly by way of german d.they have been borrowed directly from greek writers. i choose d???
*April 14, 2010*

**English-Your thoughts count**

yea i agree with ms.sue the writer is bascially telling a story about how her life is growing,,lol
*April 14, 2010*

**English-Your thoughts count**

i think the line is trying to say the writer is seeing its life grow day by day as if it was a blooming flower.like if he was a catapila growing into a buterfli no disrespect but i think u r WAY off lol
*April 14, 2010*

**latin BASES**

lol ur funny but thank you
*April 14, 2010*

**latin BASES**

which latin base means head? a}GNO- b}LOC- c}CAPIT d}ROG- p.s.what do u think? i choose c :)
*April 14, 2010*

**help plz**

monique n--ok monique n but i dont see any of the questions u posted sorry :( ms.sue--yea i did but i couldnt seem to find the answer.but thank u anyway confused--thank you for your help:)
*April 14, 2010*

**help plz**

thx i will posting more questions so if u can help go right ahead lol
*April 14, 2010*

**help plz**

Which word is a synonym of the word evolve? a}recession b}decline c}progress d}retrogression p.s.ive been working on this same question for 1 month todaysthe last day i have can some1 plz just give me the answer plzzz lol btw:who likes boxing?0_o
*April 14, 2010*

**chem101**

50.0ml of 0.10M HCL{aq} was added to 40.0ml of 0.10M NaOH{aq} and the mixture was stirred,then tested with a pH meter.What reading should be obtained for pH at 25.0degrees celcias?
*April 5, 2010*

**algebra**

(a+b)(a-2b)
*March 26, 2010*

**Physics- due tomorrow**

Two wires have current both running in the positive x direction as shown in the diagram with I1 = 13.9 amps and I2 = 4.5 amps. They are separated by a distance of d = 4.7 meters. A third wire with I3 = 10 amps is placed somewhere between the two wires with current running in ...
*March 24, 2010*

**Physics**

Two infinitely long wires are separated by a distance of d = 1.4 meters. Both have current running in the positive y direction. A charge of q = +2.7 micro-Coulombs is moving in the positive y direction at v = 3.1 E 6 m/s a distance of r = 0.22 meters from the wire on the left ...
*March 23, 2010*

**Physics**

ok thanks that is what i thought it might be but i just wanted to make sure. I also have another problem that i am hoping that you could help me with. A car requires 30 horsepower to move at a constant 20m/s what is the amount of friction that is needed to overcome?
*March 9, 2010*

**Physics**

An arrow with a mass of 30g is shot straight up to a height of 130m what is the arrow's initial velocity?
*March 9, 2010*

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