Saturday

April 19, 2014

April 19, 2014

Total # Posts: 68

**statistics**

5. Suppose a manufacturer of computer chips is experiencing an average of 2% defective chips. (a) If a lot contains 1000 chips, what is the probability that more than 25 chips are defective? HINT. Use the normal approximation to the binomial.

**English**

How do you use Treachery in a compound sentence using independent clauses.

**Science (urgent!)**

Three characteristics of friction force and surface type. Three characteristics of friction force and mass. Three characteristics of friction force and surface area. I don't quite understand what they mean by characteristics, or what they want me to do. Could I please get ...

**Science**

List: Three characteristics of friction force and surface type. Three characteristics of friction force and mass. Three characteristics of friction force and surface area.

**physics**

a bird flies 30cm and walk a distance of 60cm at 45 degree. what is its resultant displacement

**physics**

a bird flies 30cm and walk a distance of 60cm at 45 degree. what is its resultant displacement

**calculus**

a spherical balloon's radius was measured to be 30 cm with a maximum possible error of 0.2 cm. a) use differentials to estimate the maximum error in the calculated volume. b) what is the relative error?

**calculus**

air is being pumped into a spherical balloon at a rate of 8 cm^3/min. Find the rate at which the radius of the balloon is increasing when the balloon's radius is 5 cm.

**Grammar**

vffg

**english**

Explain How Sean's Feelings Toward Vid And His Hobby Changed During The Beginning Middle And End Of The Story '' Stuck In Storage''

**Math**

okay so the equation is -4.9t^2 - 39.2t + 1.6 If the rockets explode at the highest point (which max height is 80 meters) One of the rockets is schedules to explode 2 minutes and 28 seconds into the program. When should the rocket be fired from the barge? (How long, from start...

**Math**

okay so the equation is -4.9t^2 - 39.2t + 1.6 If the rockets explode at the highest point (which max height is 80 meters) One of the rockets is schedules to explode 2 minutes and 28 seconds into the program. When should the rocket be fired from the barge? (How long, from start...

**physics**

A converging lens of focal length 7.740 cm is 19.7 cm to the left of a diverging lens of focal length -5.51 cm. A coin is placed 18.2 cm to the right of the diverging lens. a. Find the location of the coin's final image. b. Find the magnification of the coin's final im...

**chemistry**

A student performed the nitration of Benzoic Acid. She/he started with 7.2 g of starting material and obtained 4.8 g of product. Assuming Benzoic Acid is the limiting reagent; calculate the theoretical and percent yields. Show the equation and all steps of your calculations.

**geometry**

a rectangular sandbox has dimensions of 4 feet by 5 feet how many yards is the perimeter of the sandbox?

**math**

A ball has a 75% rebound ratio. When you drop it from a height of 16 ft, it bounces and bounces... When it strikes the ground for the second time, the ball has traveled a total of 28 ft in a downward direction. How far downward has the ball traveled when it strikes the ground ...

**Math**

Find a parametric description for the ellipse having the focus F=(0,-4), corresponding directrix y=3, and eccentricity e=3/4.

**Math**

Given the plane 2x-3y+7z=4, find the equation for the line perpendicular to the plane that intersects the plane at the point (6,5,1).

**GEOMETRY **

The lengths of the two sides of a triangle are given. Descride the lengths possible for the third side. 8ft, 12ft.What is the answer.

**Algebra**

Suppose a model of the space shuttle endeavour is 10 inches tall.the actual height of the endeavour is 100 feet.what is the scale of the model?

**spanish**

cuantos libras usted pesas?

**6th grade math**

a man is now three times as old as his son and was 30 when his son was born. how old is his son now?

**6th grade math**

if Mary buys oranges at 5 for 2 cents and sell them at 4 for 3 cents how many must she buy and sell to make a profit of 420 cents?

**physics**

Hurricanes can involve winds in excess of 120 km/h at the outer edge. Make a crude estimate of the energy of such a hurricane, approximating it as a rigidly rotating uniform cylinder of air (density 1.3 kg*m^3 of radius 120 km and height 4.5 km. Make a crude estimate of the an...

**science**

what does recessive allele mean?

**Math**

word

**Math**

word

**Math**

word

**Math**

Wait, I'm confused. How does the angle equal more than what the entire thing is, which is m<AOE=162? Or did I sketch this wrong?

**Math**

B is in the interior of <AOC. C is in the interior of <BOD. D is in the interior of <COE. m<AOE=162, m<COE=68, and m<AOB=m<COD=m<DOE. Find m<DOA. I have a sketch of the angles, and this is what I have so far as for work: 162=68+3x 94=3x x=31.3 x is t...

**Health**

Thank you. Is there a website that says that? I need to site my information.

**Health**

Where can I find information concerning the vaccines required for children going to private schools? I found the requirements for public schools in the CDC website, but haven't been able to find it for private schools. Do you know if they are the same as public schools? An...

**science**

what are 5 facts on screw?

**Science**

How does physics apply in a homemade glass xylophone? [8 glasses of same size filled with water at different levels for pitch, and tapped with a spoon to make the sound] I know it has something to do with waves and sound, but I'm not quite sure what else. Thank you!

**social studies**

white ia to _____ as blacky is to inky

**math**

Thanks for your help.!

**math**

I keep getting an answer with an exponent and i am not sure what i have done wrong here. Any help is appreciated. To save for his retirement, Jeff puts $800 per month into his savings account every month for 30 years. The savings account pays 9% interest compounded monthly. H...

**math**

I could only get the first part of this question. Can someone help me with the second part? You borrow $7000 from a bank for 3 years at an interest rate of 10% per year compounded daily.(Assume there are 365 days in every year) a) HOw much do you pay the bank back in total? b)...

**Math**

Could someone please check my answer? Thanks You lend Joanne $62,000. You charge an interest rate of 18% compounded weekly. Joanne will pay you back in regular weekly payments for 10 years, at which time the loan will be repaid in full. What is the amount of the regular paymen...

**math**

a paint supplier has two machines that prouce both indoor paint and outdoor paint. to meet its contractual obligations,the company must produce at least 60 gallons of indoor paint and 100 gallons of outdoor paint. machine 1 makes 3 gallons of indoor paint and 10 gallons of out...

**Chem**

Is this the balanced chemical equation for reaction between NaBr and H2SO4? H2SO4 + NaBr ---> HBr + NaHSO4

**Physics**

A 1.0-kg ball on the end of a string is whirled at a constant speed of 2.0 m/s in a horizontal circle of radius 1.5 m. What is the work done by the centripetal force during one revolution? I did: F=m(v^2)/r F=1(2^2)/1.5=2.7 J The answer that was provided was 0. Can someone exp...

**Physics**

Nevermind, I got it. I was solving for velocity the first time when it should have been mass.

**Physics**

A projectile is launched with 200kg m/s of momentum and 1000 J of kinetic energy. What is the mass of the projectile. The answer is said to be 20 kg but I can't get it. I tried this but it didnt work: p=mv=200 m=200/v I plugged that into this equation: KE=1/2mv^2=1000 = 1/...

**Physics**

THanks for the explanation.

**Physics**

I posted something concerning this question earlier.. and thank you for checking and letting me know of my mistake. I said that for a given velocity, the height does not depend on the mass of the ball. How could I explain this, besides the fact that when calculuting it, I don&...

**Physics**

The muzzle velocity of a ball bearing was calculated through an experiment (1.22m/s). A student then wants to verify that the velocity calculated is right. So, she conducts an experiment in which she points the ball bearing launcher upwards. She measures the height the ball be...

**math stuff**

Do the exact calculation: 7182 x 2123= ________ Approximate to the nearest hundred _____x_____=__________ Difference between exacct and approximate value=_______ Can you help me with another problem too? N of the 20 coins are quarters and the rest are dimes. the total value of...

**chem**

Consider the equation A <-> in a 1L container. At 7.57C, the molar concentrations of A and B are 7.228M and 1.976 (respectively). Suddenly, 1.831 moles of A are added to the system. What is the change in deltaG of the system (Answer in kJ) At first, I thought I would use...

**Chem**

This is also from the lab concerning activity serious of metals and calculation of electrode portentions... Question: What are the standard conditions for measuring potentials? Does that mean... Standard condition for temp: 298K Concentration: 1 molar concentration Pressure: 1...

**Chem**

This is a lab concerning activity serious of metals and calculation of electrode portentions... Complete the following: if there is NO reaction write NR: (They provided the reactants, my answer is the products) Iron(s) + copper sulfate(aq) → iron sulfate(aq) + copper(s) ...

**Chem**

Given E° (Al3+|Al) = -1.66V and E° (Ag+|Ag) = .80V, calculate the overall cell potential when the two half-cells are connected. My answer: E°cell = E°(cathode) - E°(anode) E°cell = .80 + 1.66 = 2.46 Is this correct? That's right.

**Chem**

Write the equation for dissocation of acetic acid in water: My Answer: CH2COOH + H2O <=> H3O+ + CH3COO- Equation for hydrolysis of acetate anion in water: My Answer: CH3COO- + H2O <=> CH3COOH + OH- Now, using the above formulas, I have to show how a buffer works wh...

**Science - Biology**

Which cell in the human body doesn't carry chromosomes? thx much. :) matured red blood cells do not have a nucleus in humans (and many other mammals).

**Chem**

I am doing a lab concerning pH... Why is it necessary to allow a mixture of 25mL of a 0.1M HCl solution with 20mL of a 0.08M NaOH solution to cool to room temperature? (I don't know if the actualy concentrations matter) Does it affect the pH? Yes, temperature affects the p...

**Chem (continuation)**

I am a little confused regarding a question I posted yesterday ("Chem" Tuesday, March 6, 2007 at 9:29pm) I understand the answer to the first question: What would the pH of this solution be after 0.01 mol of HCl was added? I got 6.09 I'm still kind of confused ab...

**Chem**

Calculate the pH of a solution composed of 155mL of 0.1 M acetic acid and 45 g of sodium acetate. The pKa of acetic acid is 4.76. MY ANSWER: pH = 4.76 + log(3.53M/0.1M) pH = 6.31

**Chem**

This is concerning Le Chatelier's Principle and Equilbrium... After I give a definition of what it means when it is said that salt is soluble and what is meant by insoluble, I am asked: Why are these terms very broad and not very accurate? Can someone start me on this... t...

**Biology**

The endosymbiont hypothesis offers an explanation for how eukaryptoc cells could have obtained mitochondria and chloroplasts through a symbiotic relationship with prokaryotic cells that changed over time. What structural feature of prokaryotic cells might you expect to have ch...

**Chem**

Ammonium bromide is a crystalline solid that decomposes endothermically when heated. The reaction is NH4Br(s) <===> NH3(g) + HBr(g). When solid ammonium bromide is added to an evacuated flask at 300°C, which change in reaction conditions below will cause the equlibri...

**Chem**

First off, thanks for the help on the other problems... For the reaction, A(g) + 2 B(g) <==> 2 C(g), Kc = 1 x 10-10 at 25°C. Which of the following statements is true? 1. Delta n = +1 2. The concentration of the products is greater than the concentration of the react...

**Chem**

Which one has an optical isomer? butryic acid t-butanol 2-bromo-2-methylbutane 2-amino-2-methyl-butal-1-ol I know it's not t-butanol or 2-bromo-2-methylbutane. Is it 2-amino-2-methyl-butal-1-ol? Correction to above: 2-amino-2-methyl-butan-1-ol (Butan is with an "n&quo...

**Chem Check**

Consider the following gas phase reaction: 3A(g)+ 2B(g) <==> 1C(g)+4D(g). At 181.1C, Kp=270.91. Calculate Kc under these conditions. My answer: change of n = (1+4)-(3+2)=0 kp=kc(RT)^(change of of n) 207.91=kc(.0821)(454.1)^0 Therefore, kc=270.91 Is this correct? yes, Kp=...

**Math for Chem Lab**

There are two ways in which you can obtain results from a completed graph. One is by interpolation and the other is by extrapolation. What is the difference between these two terms and which one do you believe may lead to erroneous conclusions and why? My answer: Interpolation...

**Chemistry**

Consider the reaction A ==> B. If the reaction is first-order in A with the initial concentration A being 6.048M, what is the concentration of A after 1.986 seconds if the rate constant is 0.483s-1? Error tolerance: ±0.5% Can someone explain how to do this? Thanks ln...

**geography**

if you travel westward along the 80th parallel north of the equator from the international Date line to 150 degrees East longitude, how far have you gone in both degrees of longitude and miles? Enter these coordinates in this web site and you'll get an approximate answer i...

**English**

In my class we're doing abbreviations, and I'm entirely stuck on this one. The abbreviation is NAmlnd. I'm guessing the first two words is North America, and I'm not sure what the last four letters stand for. Since this came from a crossword puzzle, in all, the...

**The lord of the flies-English**

ralph tells the twins that he is going to hide so then they can tell Jack's tribe to go somewhere else as to trick him. this was irony for SamnEric because they could of did the opposite of what Ralph told them and just tell Jack where Ralph is hiding at.

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