# 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 ...

**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 ...

**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 ...

**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 ...

**chemistry**

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

**Math**

tks so much

**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...

**Trig**

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

**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.

**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^-(...

**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?

**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?

**Physics**

shouldnt the work = Fp*d*cos(angle between) ?

**6grade**

the United States of America has 50 states.Wirte 50 as product of primes.Please help me out !

**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,...

**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...

**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...

**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 ...

**physics**

Vf=19.3 m/s Change in Displacement = 59 meters

**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...

**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.

**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?

**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.

**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?

**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.

**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.

**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 ?

**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.

**suffixes**

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

**history**

Creat a timeline of the major events in houston's history

**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

**3rd grade**

Design an experiment that teacher others how to use a balance correctly

**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 don't know where to start. Here is the code import javax.swing.JOptionPane; public ...

**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) + ...

**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?

**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.

**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 ...