marisol
Popular questions and responses by marisol
Physics
A 1.0kg 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
asked on October 23, 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
asked on February 14, 2007 
programming concepts
Input a list of employee names and salaries stored in parallel arrays. The salaries should be floating point numbers in increments of 100. For example, a salary of $ 36,000 should be input as 36.0 and a salary of $ 85,900 should be input as 85.9. Find the
asked on December 13, 2014 
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 didn't work: p=mv=200 m=200/v I plugged that into this equation:
asked on October 23, 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
asked on March 21, 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
asked on February 11, 2007 
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
asked on May 26, 2011 
math
Kevin will rent a car for the weekend. He can choose one of two plans. The first plan has no initial fee but costs $0.90 per mile driven. The second plan has an initial fee of $50 and costs an additional $0.70 per mile driven. How many miles would Kevin
asked on March 28, 2016 
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?
asked on April 8, 2013 
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?
asked on November 28, 2010 
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.
asked on April 8, 2013 
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
asked on March 28, 2007 
Math
The length of a rectangle is 8 meters less than 5 times its width. if the perimeter of the rectangle is at most 104 meters, find the greatest possible width of the rectangle.
asked on November 3, 2015 
Math
B is in the interior of
asked on October 4, 2009 
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
asked on March 31, 2008 
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?
asked on November 28, 2010 
Chem
Is this the balanced chemical equation for reaction between NaBr and H2SO4? H2SO4 + NaBr > HBr + NaHSO4
asked on October 28, 2007 
Chem
Given E° (Al3+Al) = 1.66V and E° (Ag+Ag) = .80V, calculate the overall cell potential when the two halfcells are connected. My answer: E°cell = E°(cathode)  E°(anode) E°cell = .80 + 1.66 = 2.46 Is this correct? That's right.
asked on March 22, 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,
asked on March 7, 2007 
Chemistry
Consider the reaction A ==> B. If the reaction is firstorder 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 0.483s1? Error tolerance: ±0.5% Can someone explain how to do
asked on February 6, 2007 
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
asked on January 28, 2012 
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
asked on February 9, 2007 
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
asked on April 10, 2008 
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
asked on October 14, 2007 
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
asked on January 18, 2012 
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
asked on October 26, 2010 
Chem
Which one has an optical isomer? butryic acid tbutanol 2bromo2methylbutane 2amino2methylbutal1ol I know it's not tbutanol or 2bromo2methylbutane. Is it 2amino2methylbutal1ol? Correction to above: 2amino2methylbutan1ol (Butan is
asked on February 9, 2007 
math
how long it will take $1000 to earn 100 at 15% simplest interest, to accumulate too at least 1200 at 0.135 simplest interest?
asked on January 20, 2016 
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.
asked on March 23, 2014 
geometry
a rectangular sandbox has dimensions of 4 feet by 5 feet how many yards is the perimeter of the sandbox?
asked on October 27, 2011 
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
asked on March 7, 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
asked on January 29, 2007 
math
find the discounted value of 500 due in 82 days at 9%, 1000 at 55 days at 15% using both ordinary and simplest interest?
asked on January 20, 2016 
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.
asked on October 30, 2013 
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.
asked on October 22, 2008 
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
asked on January 3, 2007 
english
Explain How Sean's Feelings Toward Vid And His Hobby Changed During The Beginning Middle And End Of The Story '' Stuck In Storage''
asked on 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?
asked on February 26, 2012 
Math
Given the plane 2x3y+7z=4, find the equation for the line perpendicular to the plane that intersects the plane at the point (6,5,1).
asked on May 25, 2011 
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
asked on February 25, 2009 
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
asked on October 14, 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
asked on February 21, 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 1010 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
asked on February 9, 2007 
science
what does recessive allele mean?
asked on February 16, 2010 
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
asked on 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
asked on April 10, 2008 
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
asked on March 6, 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
asked on February 7, 2007 
English
How do you use Treachery in a compound sentence using independent clauses.
asked on 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.
asked on October 31, 2013 
Math
Find a parametric description for the ellipse having the focus F=(0,4), corresponding directrix y=3, and eccentricity e=3/4.
asked on May 25, 2011 
social studies
white ia to _____ as blacky is to inky
asked on April 21, 2008 
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
asked on April 7, 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
asked on March 28, 2007 
math
marisol has 5,000 dolers shc spen 200 the muvis how meny dolors ths marisolj hav lefet 5,000100=4,000
asked on March 6, 2016 
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?
asked on February 26, 2012 
science
what are 5 facts on screw?
asked on December 16, 2008 
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).
asked on March 8, 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
asked on April 1, 2007

Math
Harry ate 4/8 of a Marge pizza aiden ate 1/2 of a Anallely pizza harry dais that since 4/8 is equivalent to 1/2 the and aiden ate the sane amount of pizza is the correct
posted on September 23, 2019 
Math
Alyssa said, that. 6/8 and 9/12 are not equivalent because there. Is no whole number. You can multiply. Both parts of 6/8 by to get 9/12. Is she correct
posted on September 22, 2019 
science
D.
posted on February 19, 2018 
Math
how do you write a mixed number?
posted on November 2, 2017 
Computers
A Boolean operator is a connecting word or symbol that allows a computer user to include or exclude items in a text search.
posted on November 2, 2017 
Math
Its hard to solve for x can you help me?
posted on November 2, 2017 
chemistry
895860
posted on August 28, 2017 
chemistry
At 100 degrees celsius Compound B (Has the greater mass): 10g x 100mL/16g = 62.5mL When cooled to 20 degrees celsius Compound A: 62.5mL x 1g/100mL = 0.625g Compound B: 62.5mL x 1g/100mL = 0.625g Therefore the mother liquor contains 0.625g of each.
posted on March 9, 2017 
4th math
order the numbers from least to greatest, 6,8,9,13
posted on October 17, 2016 
Math
24
posted on October 8, 2016 
trig
4/3
posted on March 6, 2016 
math
5,000100=4,00
posted on March 6, 2016 
physics
a bird flies 30cm and walk a distance of 60cm at 45 degree. what is its resultant displacement
posted on June 30, 2013 
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?
posted on February 13, 2013 
Grammar
vffg
posted on November 14, 2012 
spanish
cuantos libras usted pesas?
posted on April 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.
posted on February 17, 2011 
The lord of the fliesEnglish
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.
posted on December 2, 2010 
Math
word
posted on October 17, 2010 
Math
Wait, I'm confused. How does the angle equal more than what the entire thing is, which is m
posted on October 4, 2009 
Health
Thank you. Is there a website that says that? I need to site my information.
posted on February 25, 2009 
math
Thanks for your help.!
posted on April 10, 2008 
Physics
Nevermind, I got it. I was solving for velocity the first time when it should have been mass.
posted on October 23, 2007 
Physics
THanks for the explanation.
posted on October 14, 2007