Friday

April 18, 2014

April 18, 2014

Total # Posts: 816

**Quantum M.**

Why "In Hilbert Space noone can hear you scream"?

**math**

16.7%

**math**

this was emily's full day yesterday: she spent 8 hours sleeping, 1 hour in the shower, 6 hours in class, 2 hours eating and snacking, 4 hours studying, and 3 hiurs watching tv. What percent of her day was spent studying.

**math**

Answer is 40%

**math**

a movie theater has 250 seats. One hundred tickets have been sold. What percent of fhe theater is filled?

**maths**

A particle of mass 4 kg is attached to one end of an inelastic string and a particle of mass 2 kg is attached to the other end of the string.The string has length 4m and is hung over a smooth pivot at its midpoint. The Pivot lies 3m above the ground.How long does it take for o...

**Calculus AP**

Added spaces for it to let me add the picture. h t t p : / / g o o . g l / v S l t p

**Calculus AP**

Let R be the region bounded by the graphs of y=cos((pi x)/2) and y=x^2-(26/5)x+1. A. Find the area of R. B. The vertical line x=k splits the region R into two equal parts. Write, but do not solve, an equation involving integrals that solves for k. C. The region R is the base o...

**Calculus AP**

I spaced it out. This the picture. h t t p : / / g o o. g l / A h g J X

**Calculus AP**

Let R be the region in the first quadrant bounded by the graph y=3-√x the horizontal line y=1, and the y-axis as shown in the figure to the right. Please show all work. 1. Find the area of R 2. Write but do not evaluate, an integral expression that gives the volume of th...

**Math**

Oh I get it now, okay thank you very much!!

**Math**

Dalia made 8 party bags for her birthday party. Each bag contained 4 small gifts for her friends. When Denis said that she could come, Dalia had to make one more bag with 4 gifts. How many small gifts did Dalia need to fill her bags? Walter wrote this number model: 8 x (4+4)=6...

**maths**

1) Suppose that an insect crawls in a plane in a path given in polar coordinates by r = be^kt; theta = kt; where b; k are positive constants and t is time.Find the velocity and acceleration vectors of the insect. Show that the angle between the velocity and acceleration v...

**Math**

How do you solve g? 4 = (1 + g)^20

**Macroeconomics**

Suppose GDP is $800 billion, taxes are $150 billion, private saving is $50 billion and public saving is $20 billion. Assuming this economy is closed, calculate consumption, government purchases, national saving and investment.

**math**

Suppose that you deposit $1735.50 in a savings account that pays 9.25% annual interest with interest credited to the account at the end of each year. Assuming no withdrawals are made, find the balance in the account after 4 years

**Math**

What are the steps to solve for n?: 50000 = 1000(1 + 0.8)^n

**maths**

1)is the ring of real polynomials R[X] countable and why ?

**maths**

Let a, b, c and d be vectors. (i) Show that (a - b) * (a + b) = a^2 - b^2

**Physic **

A block (mass 2.4 kg) is hanging from a massless cord that is wrapped around a pulley -3 2 (moment of inertia of the pulley = 1.3 x 10 kg·m ), as the drawing shows. Initially the pulley is prevented from rotating and the block is stationary. Then, the pulley is allowed ...

**English**

Thank you so much!

**English**

Rephrase the main idea of the sample in your own words, without repeating words or sentence structure from the original statement. (I honestly can't seem to decide on how it should be worded) "Air pollution can also have a significant impact on our economy. It can cos...

**English**

I have: NPD have pointed out that smartphones have rapidly increased 84 percent from 2007 to 2008, and are currently selling fast in America.

**English**

Rephrase the main idea of the sample in your own words, without repeating words or sentence structure from the original statement. "Right now, smartphones are selling like mad in the U.S. market, where sales jumped 84 percent between 2007 and 2008, according to NPD, the m...

**East**

I need an equation that has something to do with the role of static friction in the design of tires

**maths**

n! is greater or equal to 2^n-1 prove by induction

**math**

A tree is struck by lightning. The top part breaks and falls to the ground. The part of the tree still standing is 30 feet tall and the top part that hit the ground is 40 feet from the base of the tree. How tall was the tree originally?

**maths**

integrate by parts integrate (4+x^2)^1/2

**ap calculus**

I'm sorry... I'm just not super comfortable posting my name on the web... Can you still please help me??

**ap calculus**

Which of the following definite integrals gives the length of y = e^(e^x) between x=0 and x=1? All the answers are preceded by the integral sign from 0 to 1. (a) sqrt[1 + e^(2*(x+e^x))] dx (b) sqrt[1 + e^(4x)] dx (c) sqrt[1 + e^(x+e^x)] dx (d) sqrt[1 + e^(2e^x)] dx (e) sqrt[e^...

**chemistry**

Sorry but what do Ka/Kb values tell me?

**chemistry**

I know caffeine is more polar than salicylic acid but how would I explain that given their respective structures? I know for smaller molecules you would figure out the polarity of individual bonds and the molecule's geometry but I can't figure out how to transfer this...

**Math**

He's allowed to keep it is the fish is exactly 22 inches so you need to find the difference between 22 and the actual length of the fish (i.e. subtract how long the fish is from 22)

**chemistry**

Please help. My teacher never went over crystal lattices and the book doesn't cover it either :( Copper crystallizes in a face-centered cubic lattice. If the edge of the unit cell is 351pm, what is the radius of the copper atom?

**Social Studies **

In what ways did China And Europe parallel each other in their development until the sixth century CE? How did they diverge after that?

**math**

in order to increase the mean of 6 numbers by 3, what would the total sum of the increase be? A. 3 B.9 C.12 D.16 E.18

**MATH urgent**

Hello!! 1. find the third derivative of f(t)=(t-1)/(t+1) 2. y= x^(x^2) ; dy/dx please help! thank you!

**HEALTH HELP PLEASE!!**

Fats help maintain your cell membranes. (1 point) True False 12. Your body does not use energy when you sleep. (1 point) True False 13. People with anorexia nervosa eat large amounts of food and then purge. (1 point) True False 14. Your body image is the way others see your bo...

**maths**

Let p(x) = 1 + 4x + 2x^2 + 2x^3 in Z5[x]. Find all roots of p(x), and write p(x) as a product of irreducible polynomials.

**maths**

differentaite w.r to x h(x) = arcosh(x^3 + 2).

**pre cal**

How lnog will it take for an investment of $1000 to double in value if it earns 5% coumpounded weekly?

**Maths**

in the following rings find all units, Zero divisors and idompotent elements and determine whether the ring is a field. a)Z2 b)Z5 c)Z10 NB z is integers( positive or negatives including zero z is integers( positive or negatives including zero

**physics**

An object moves along a circular path with a constant speed, |⃗vo|. (Semi Circle with point A on one side point B on the other. Looks like a 90 degree angle with points A and B on either side of the hypotenuse.) The average acceleration in going from A to B is 1. zero 2....

**Maths**

steve

**Maths**

(cos8x+cos2x)/2 steve is it right

**Maths**

cos3xcos5x how do rewrie this using trigmetric finctions Steve thanks

**Maths**

Steve help please

**Maths**

how did you do sin2x cos4x = (sin6x + sin2x)/2 what os the formula I need to use

**Maths**

1)how do you simplify 3xcos5x using trigometric functions 2)how do you simplify sin2xcos4x using trigometric functions

**maths**

thanks steve SO DOES ANSWER CHANGE IF ABELIAN?

**maths**

let G be a group with operation . and let p,q be two elements of G. simplify p.q.q.q^-1.p^-1.q^-1 as much as possible.does answer change if G is ABELIAN?

**MATHS**

prove by mathematical induction that 7^n+4^n+1 is divisible by 6

**Geometry**

my geometry problem set says "find the ratio of CG : CB" CG=6.3 and CB=19 so to find the ratio i would divide the 19 by 6.3 (we have to round so it would be a 3:1 ratio) or would it be the other way around? i think it's the 19/6.3 but i'm not sure...

**math **

I am a 3 digits number less than 200. the tenths place is 2x more than the ones place. the number in the ones place is 2. what number am i?

**orgoo**

calculate how to make 10 mL of 15:85 ethyl acetate:hexane solution from 2 mL of 5:95 ethyl acetate:hexane, using pure hexane and pure ethyl acetate.

**writing**

I have to write an essay about how Morrison uses power stuggle in Beloved to enhance the meaning of her work. I think I have some idea, but I'm just sitting here numberless. This essay is due in about 2 days. Can you help me ASAP? Thanks

**Physics**

1. mg/(cos(sin^-1(r/L)))

**world civilization**

what was the relationship between politics and science in the early modern world?

**Chemistry**

A particular oral contraceptive contains 0.041 mg of ethinyl estradiol in each pill. The formula of this compound is C20H24O2. How many moles of ethinyl estradiol are there in one pill? I need help in approaching this

**math**

Is 4,564,282 a prime or composite number?! Seriously, I have absolutely no idea!!!!!!

**orgoo**

what are the products of the reaction: HC3OH + (Na+NH2-) ?

**orgo**

What is the pH of a 5.00E-2 M solution of acetylsalicylic acid, pKa = 3.52.

**chem**

calculate the pH of 5x10^-2 M of benzoic acid with pKa= 4.19

**math**

what is the rule for the following: x = 1,2,3 y = 2,6,12

**Physics**

A bug completes one lap along the edge of a circular planter of radius 22.4 cm in 16.45 s. How fast was it traveling? Answer in units of cm/s.

**aglebra 2**

determine whether the equation has one solution, no solution, or is an identity. 5y+3=26

**chem**

P1V1/T1=P2V2/T2 ; basic proportion. STP mean standard temperature and pressure P1=700 torr V1=8 Liters T1=293K P2=standard pressure=1 atm=760 torr V2=unknown T2=standard temperature=273K i hope you can follow my though process. (700*8)/293=(760*V)/273 V=6.87

**Bio HELP!!!!**

what is the name of the process throughh which polypeptides, polysaccharides or triglycerides are catabolised (broken down)?

**math**

Use the midpoint formula

**chemistry**

.5566

**math equations**

Solve x = log3 15

**Chemistry**

how much chlorine, Cl 2, do you need to order to react completely with 500 kg of platinum, Pt, to make cisplatin, PtCl 2(NH 3) 2?

**Algebra 2**

five chips numbered 1 through 5 are placed in a bag. A chip is drawn and replaced. Then a second chip is drawn. Find the probability that the first chip is even and the other one is odd.

**Chemistry**

Exothermic means you release energy. D, freezing water, means the water releases heat in order to freeze. This release of heat, aka energy, makes it exothermic. The other answer choices require energy, making them endothermic.

**World History**

China had the largest economy still, thankfully I got it right. Thanks though!

**World History**

At the end of the eighteenth century, _______ had the largest economy in the world. A. India B. Spain C. China D. Britain I've researched this question like crazy, but I just can't seem to determine a clear answer. I know it's between China and Britain. Britain had...

**biology**

Need help with FOV area (mm2) totally confused? im confused i have the FOV diameter they are: 4x = 5 10x = 2 40x = 0.5 a classmate told me she thinks the area for 40 x is: pi(5/2)^2 = 19.6 not sure if thats true or how to do it for the low and medium, magnification. please hel...

**math**

If there are 50 floats in a parade, how many ways can a first place and a second place trophy be awarded?

**Math**

uh i think its 1/1024

**math**

the hypotenuse of a right triangle is 3 less than 4 times the shortest leg. if the longest leg is 24cm, how long is the hypotenuse

**algebra 2**

write an explicit formula for the sequence of 1/2, 3/7, 1/3, 5/19, 3/14

**chemistry**

An air sample contains 0.032%CO2 .If the total pressure is 756mmHg , what is the partial pressure ofCO2 ?

**chemistry**

A sample of gas has a mass of 0.555g . Its volume is 114L at a temperature of 80degrees C and a pressure of 744mmHg .Find the molar mass of the gas

**chemistry**

An experiment shows that a 111ml gas sample has a mass of 0.161g at a pressure of 725mmHG and a temperature of 36degrees C.What is the molar mass of the gas?

**chemistry**

How many moles of gas must be forced into a 3.1L ball to give it a gauge pressure of 9.8psi at 22degrees C? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.5psi so that the total pressure in the ball is 24.3psi .

**algebra 2**

Carlos wants to make a scale drawing of a rectangle. he wants the rectangle to have a length of (x-1) units and an area of 1-x/x^2+1 square units. What can you say about how wide the rectangle should be? Explain.

**chemistry**

Calculate the pressure drop expected on hydrogenation of the mixture of 5.00 ml of cyclohexene and 35 ml of cylclohexane. I know I have to use PV=nRT but this is all I know we are starting at 60 psi of pressure. We also used hydrogen gas if that helps

**chem**

calculate the concentration of borate ion for a titration when 6.0998g borax is dissolved in 100mL of water and titrated with 25.5mL of HCl

**Chemistry**

What is the pH of a 2.5 x 10-2 M HCl solution? I'm so confused how to find this :(

**chem**

A hydrofluoric acid buffer solution has the following concentrations: [HF]=0.43M [F-]=0.45M If 40 mL of 0.1M NaOH is added to 500 mL of the buffer, what is the resultant pH?

**Physical Science**

The conversion of water to ice is considered a physical change, whereas the conversion of iron to rust is considered a chemical change. Why?

**calculus**

what is the linear approximation of f(x)=x^3-x at x=2

**chem**

what is the ph of a solution that results from adding 30 mL of .015M KOH to 50 mL of .015 M benzoic acid?

**Geology**

Granite age for Scottish highlands

**English**

how has the world changed for the better? besides technology & medicine

**trig**

if one of a quadratic equation is 1/2-2i, what is the equation. the other root is 1/2+2I but i dont know how to find the equation

**American Government**

Who has to run for re-elecition every two years?

**Social studies**

Why would the Chinese want to limit population growth?

**math**

1) Why should we clear fractions when solving linear equations and inequalities? Demonstrate how this is done with an example. Why should we clear decimals when solving linear equations and inequalities? Demonstrate how this is done with an example.

**History**

Little Richard, Chuck Berry, Fats Domino, Frankie Lymon and... Martin Luther King?

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