Wednesday
August 20, 2014

Posts by Marisol


Total # Posts: 65

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.
March 23, 2014

English
How do you use Treachery in a compound sentence using independent clauses.
February 2, 2014

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 ...
October 31, 2013

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.
October 30, 2013

physics
a bird flies 30cm and walk a distance of 60cm at 45 degree. what is its resultant displacement
June 13, 2013

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?
April 8, 2013

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.
April 8, 2013

Grammar
vffg
November 14, 2012

english
Explain How Sean's Feelings Toward Vid And His Hobby Changed During The Beginning Middle And End Of The Story '' Stuck In Storage''
August 6, 2012

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...
February 26, 2012

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...
February 26, 2012

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 ...
January 28, 2012

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.
January 18, 2012

geometry
a rectangular sandbox has dimensions of 4 feet by 5 feet how many yards is the perimeter of the sandbox?
October 27, 2011

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 ...
May 26, 2011

Math
Find a parametric description for the ellipse having the focus F=(0,-4), corresponding directrix y=3, and eccentricity e=3/4.
May 25, 2011

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).
May 25, 2011

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.
February 3, 2011

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?
February 2, 2011

spanish
cuantos libras usted pesas?
December 7, 2010

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?
November 28, 2010

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?
November 28, 2010

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 ...
October 26, 2010

science
what does recessive allele mean?
February 16, 2010

Math
word
October 4, 2009

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?
October 4, 2009

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 ...
October 4, 2009

Health
Thank you. Is there a website that says that? I need to site my information.
February 25, 2009

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? ...
February 25, 2009

science
what are 5 facts on screw?
December 16, 2008

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!
October 22, 2008

social studies
white ia to _____ as blacky is to inky
April 21, 2008

math
Thanks for your help.!
April 10, 2008

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. ...
April 10, 2008

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)...
April 10, 2008

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 ...
April 10, 2008

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 ...
March 31, 2008

Chem
Is this the balanced chemical equation for reaction between NaBr and H2SO4? H2SO4 + NaBr ---> HBr + NaHSO4
October 28, 2007

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 ...
October 23, 2007

Physics
Nevermind, I got it. I was solving for velocity the first time when it should have been mass.
October 23, 2007

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/...
October 23, 2007

Physics
THanks for the explanation.
October 14, 2007

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...
October 14, 2007

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 ...
October 14, 2007

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...
April 7, 2007

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...
April 1, 2007

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...
March 28, 2007

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) ...
March 28, 2007

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.
March 22, 2007

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 ...
March 21, 2007

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).
March 8, 2007

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 ...
March 7, 2007

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 ...
March 7, 2007

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
March 6, 2007

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... ...
February 21, 2007

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 ...
February 14, 2007

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 ...
February 11, 2007

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 ...
February 9, 2007

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&...
February 9, 2007

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=...
February 9, 2007

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...
February 7, 2007

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...
February 6, 2007

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 ...
January 29, 2007

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...
January 3, 2007

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.
November 21, 2006

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