Sunday

April 20, 2014

April 20, 2014

Total # Posts: 758

**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 ...

**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 ...

**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...

**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...

**Math**

How do you solve: (-2t)^2(3t^7)^2

**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.

**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.

**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.

**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.

**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. W...

**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

**Algebra**

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

**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?

**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...

**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

**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 wo...

**social studies**

two examples of lines of lattitudes which can be found on a map?

**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...

**ethics**

What is virtue and how do we acquire it? this is according to aristotle

**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

**science**

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

**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 you...

**ethics**

what does kant mean by a good will without qualification?

**algebra**

How big is the solution set for an equation that cannot be solved

**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...

**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

**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

**business**

a

**algebra**

Oh hey im taking algebra.

**calculus**

Sorry for the misunderstanding. The X is a multiplication sign and the 4 is multiplied to the cubed root of 3.

**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.

**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 ans...

**Math/Albebra**

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

**U.S. and Global Economics**

(This homework question was removed due to a copyright claim submitted by K12 Inc.)

**human growth and developmnet**

it is stupid

**Intro to visual business**

What specific visual film techniques do you see utilized in contemporary television?

**Chemistry**

Itz Balanced.

**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?

**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?

**Chemistry**

What is the freezing point of an aqueous solution that boils at 102.1 C?

**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.

**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

**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?

**math**

15over51 in simplest form

**6th grade**

perplexed,mystifiedor puzzled

**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.

**Chemistry**

i dont think u can draw on this website lol

**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 :(..

**confuseddddd**

how come these comments keep earasing???0_confused

**uhh help**

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

**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??

**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

**help plz:)**

im sorry i meant to say b lol

**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???

**English-Your thoughts count**

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

**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

**latin BASES**

lol ur funny but thank you

**latin BASES**

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

**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:)

**help plz**

thx i will posting more questions so if u can help go right ahead lol

**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

**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?

**algebra**

(a+b)(a-2b)

**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 t...

**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 ...

**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?

**Physics**

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

**AP Physics**

A merry-go-round rotates at the rate of.2rev/s with an 80kg man standing at a point 2m from the axis ofrotation. (A)What is the new angular speed when the man walksto a point 1m from the center? Assume that the merry-go-round is a solid 25kg cylinder of radius of 2m. B. calcul...

**Physics(Please help)**

Forces between like molecules, such as the force between water molecules.

**physics**

In the high jump, Fran's kinetic energy is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must Fran leave the ground in order to lift her center of mass 1.95 m and cross the bar with a speed of 0.70 m/s?

**physics**

How much work must be done to stop a 1150-kg car traveling at 145 km/h?

**physics**

what is mu?

**physics**

What is the minimum work needed to push a 850 kg car 940 m up along a 9.5 degree incline? Part A: Ignore Friction Part B: Assume the effective coefficient of friction retarding the car is 0.20.

**physics**

What is the maximum speed with which a 1200-kg car can round a turn of radius 68 m on a flat road if the coefficient of static friction between tires and road is 0.80?

**physics**

i put 1023.04 as the answer and it said it was wrong

**physics**

1023.04 N/M

**physics**

A 1300-kg car rolling on a horizontal surface has speed v = 65 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.3 m. What is the spring stiffness constant of the spring?

**physical**

What is pressure point?

**Science**

Is it ever possible to be completely healthy?

**crt**

someone help me it c or a f on my final grade

**crt**

Exercise 6-6 Identify any examples of fallacies in the following passages. Tell why you think these are fallacies, and identify which category they belong in, if they fit any category we’ve described. 1. Letter to the editor: “I would like to express my feelings on t...

**Physics**

A fisherman's scale stretches 4.2 cm when a 3.0 kg fish hangs from it. What will be the amplitude and frequency of vibration if the fish is pulled down 2.3 cm more and released so that it vibrates up and down?

**CRT 205**

Exercise 6-6 Identify any examples of fallacies in the following passages. Tell why you think these are fallacies, and identify which category they belong in, if they fit any category we’ve described. 1. Letter to the editor: “I would like to express my feelings on t...

**math**

Six

**Math**

Find all points with integer coordinates that are a distance of square root of 29 from (-4,3) how do u do this?????!?!?!?!

**french**

unscramble letters to create a french word: sforpti

**Science**

A farmer planted a field of Bt 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 22 ears in 1/1000 of an acre. He determines that each ear has about 700 kernels on average. He also knows that a bushel contains about 90 000 kernels on average. Wh...

**pyschology**

Those in late adulthood suffer depression at a higher rate than any other age group. Which is the strongest predictor of depression?

**pyschology**

As we age, our physical functioning deteriorates. This is most likely due to reduced efficiency in basic cellular processes. One cause of this is thought to be:

**Pyschology**

Considering what studies reveal about personality and how it can affect development, which of the following is true?

**Pyschology**

Morgan is a 57-year-old man whose children are off at college. According to Erikson, in order to fully develop generativity in middle age, Morgan needs to:

**1st grade**

How does wheat turn into flour?

**Physics**

what is the force on a body of a mass 77-kg when its acceleration is 4m/s^2?

**Finance**

Suppose you short-sell 100 shares of a stock at $55 with a commission charge of 0.5%. You also payu commission charge for purchasing the stock to cover the short-sale. What is your profit if you close the short-sale at $54?

**math**

solve algebraically for 8x-y=4 and 5x 3y=17

**Science**

1. How did Linnaeus's system differ from that of Aristotle? 2. What changes in technology made people beging to realize that there were probably more than two kingdoms?

**math**

40 1/2 feet plus 122 3/8 feet plus 56 1/7 feet =

**math**

in a family with two children, what are the probabilities of two boys, the first is a girl the second is a boy, neither is a girl, at least one girl, assuming that the birth of boys and girls is equally likely.

**Psychology**

What is social facilitation and how has the definition evolved"

**english**

I need help on passive voice. Is the following sentence passive voice? The results of the aptitude test were told to us by the principal.

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