Thursday
December 18, 2014

Posts by Thanh


Total # Posts: 37

chemistry
We have of ice at -11.9°C and it is ultimately completely converted to liquid at 9.9°C. For ice, use a specific heat (Cs) of 2.01 J/gK, for liquid water use a specific heat of 4.18 J/gK, and ΔHfusion = 6.01kJ/mole, Molar mass H20 = 18.01g/mol. If 4.19x10^3 kJ is ...
October 31, 2014

Physic
Air moving at 13.0 m/s in a steady wind encounters a windmill of diameter 2.30 m and having an efficiency of 29.0%. The energy generated by the windmill is used to pump water from a well 31.0 m deep into a tank 2.30 m above the ground. At what rate in liters per minute can ...
November 18, 2012

Physic
Air moving at 13.0 m/s in a steady wind encounters a windmill of diameter 2.30 m and having an efficiency of 29.0%. The energy generated by the windmill is used to pump water from a well 31.0 m deep into a tank 2.30 m above the ground. At what rate in liters per minute can ...
November 18, 2012

Physic
A father pushes horizontally on his daughter's sled to move it up a snowy incline, as illustrated in the figure, with h = 3.7 m and θ = 18°. The total mass of the sled and the girl is 35 kg and the coefficient of kinetic friction between the sled runners and the ...
November 18, 2012

chemistry
quick question, if concentrate nitric acid is listed as 70% w./w. what's the other 30 percent of the concentrated HNO3 solution?
August 30, 2012

Math
tks so much
July 29, 2011

Math
Please help me to solve it, today is mydue day ! Suppose an individual makes an initial investment of $2400 in an account that earns 8%, compounded monthly, and makes additional contributions of $100 at the end of each month for a period of 12 years. After these 12 years, this...
July 29, 2011

Trig
Cos(2theta)=-1/2 There are 6 solutions, how do i solve this?
May 10, 2011

Chem, Oxidation
I did it correctly though right? I'm trying to figure out what's wrong with the format or maybe i solve the problem wrong. So far, the previous problems, the e^- has no state and they accepted it. I have no idea what's wrong haha.
May 6, 2011

Chem, Oxidation
Complete and balance the following half-reactions. In each case indicate whether the half-reaction is an oxidation or reduction. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer.) OH ‾(aq) ¨ O2(g) I got 2OH^-(...
May 6, 2011

Math
What is the probability that x^2+7x+k will factor if k is greater or equal to zero and less than or equal to 20, considering k is an integer. How do I do this?
April 22, 2011

math 4 grade
Mr.Sports wants to buy enough sod for his new field is 16 feet,the width of the field is 44 feet.How much sod will he need to buy?How much will it cost him if the sod sells for $5.00 per 10 feet?
January 11, 2011

Physics
shouldnt the work = Fp*d*cos(angle between) ?
December 4, 2010

6grade
the United States of America has 50 states.Wirte 50 as product of primes.Please help me out !
December 2, 2010

math 4 grade
Some poeple believe that Jan 1,2000is the first day of the 21st century.Other poeple beleive that the honor belongs to the Jan 1,2001.But everyone should agree that Jan 1,2002 is the first"sum-day" of the new century when you write out that date in standard notation,...
October 19, 2010

math 4 grade
A firefighter stood on the middle rungs of a ladder ,spraying water on a burning house. He then climbed up 6 rungs before the heat of the flames caused him to come down 10 rungs.After some minutes he was able to climb 18 rungs to the very top of ladder .How many rungs did the...
October 7, 2010

math 4 grade
A firefighter stood on the middle rungs of a ladder ,spraying water on a burning house. He then climbed up 6 rungs before the heat of the flames caused him to come down 10 rungs.After some minutes he was able to climb 18 rungs to the very top of ladder .How many rungs did the...
October 6, 2010

math
A firefighter stood on the middle rungs of a ladder ,spraying water on a burning house. He then climbed up 6 rungs before the heat of the flames caused him to come down 10 rungs.After some minutes he was able to climb 18 rungs to the very top of ladder .How many rungs did the ...
October 6, 2010

physics
Vf=19.3 m/s Change in Displacement = 59 meters
September 22, 2010

math
Adam is 3 times as old as Cynthia and Fred is 16 years younger than Adam. One year ago, Adam's age was twice the sum of Cynthia's and Fred's age. Find their present age. I have a answer already but I still not get it,please help me out with answer clearly.Thank you...
September 20, 2010

math
Adam is 3 times as old as Cynthia and Fred is 16 years younger than Adam. One year ago, Adam's age was twice the sum of Cynthia's and Fred's age. Find their present age.
September 20, 2010

math
People weigh 6 times as much on Earth as they do on the moon.Mr.Marks weighs 180 pounds on Earth.How much would he weigh on the moon?
February 17, 2010

math
Joe bought something and gave the clerk a quarter .His change was 2 coins.Make a list of the different amounts Joe could have spent and what coins would have been his change.
February 10, 2010

math
The first Super Bowl was played on January 15,1976 at the Memorial Coliseum in Los Angeles.Green Bay won by 25 points.The total number of points scored in the game was 45.What was Green Bay's final score?
January 13, 2010

3 grade
A group of students would like our state to change its policy on learning how to tell time . They don't think that students should need to learn anything except how to read a digital clock . Do you agree? Why or why not ? Prepare a pamphlet that shows your point of view.
November 10, 2009

3 grade
How many more states are there that border the Great Lakes than there are Great Lakes? List each state and each Great Lake.
October 29, 2009

math
Mickey Mouse will be four score years in 2008.Donald Duck is six years younger than Mickey Mouse. In what year was Donald Duck born ?
October 5, 2009

english
Creat two word webs : one for the word good and one for the word nice .Brainstorm synonyms for these words that could be used in your writing instead. Please help me .......Thanks a lot.
September 21, 2009

suffixes
How do I know i add the suffixes is right.Ex:light add ;er or est
September 14, 2009

history
Creat a timeline of the major events in houston's history
September 9, 2009

3rd grade
Think about all of the elements that make a good mystery . Create a recipe card that shows the ingredients of a well- written mystery
September 9, 2009

3rd grade
Design an experiment that teacher others how to use a balance correctly
September 9, 2009

Java
I am supposed to convert a program i already made into a Java console application that uses the Scanner class to read the user's input. This is the code i have that i need to convert. I dont know where to start. Here is the code import javax.swing.JOptionPane; public class...
July 14, 2009

Chemistry
These are the problems I am having trouble with. 1.The first step of the synthesis is described by the reaction below. When 1.750 g of Fe(NH4)2(SO4)2 6H2O is mixed with 13 mL of 1.0 M H2C2O4 , the theoretical yield of FeC2O42H2O is how many grams? Fe(NH4)2(SO4)26H2O(s) + ...
January 26, 2009

chemistry
The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25° C. What is the mole fraction of potassium permanganate (KMn04) in this saturated solution? What is the molality of the potassium permanganate solution?
March 14, 2008

chemistry
What is the molarity of a solution of 10% by mass cadmium sulfate, CdSO4 (molar mass = 208.46 g/mol) by mass? The density of the solution is 1.10 g/mL.
March 14, 2008

chemistry
According to Raoult's law, which statement is false? a. The vapor pressure of a solvent over a solution decreases as its mole fraction increases. b. The solubility of a gas increases as the temperature decreases. c. The vapor pressure of a solvent over a solution is less ...
March 14, 2008

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