Tuesday

February 21, 2017
Total # Posts: 35

**Physics**

do it yourself

*February 21, 2017*

**Physics**

A stone is dropped from a hot air balloon that is rising at a constant speed of 2.2 m/s. If the stone takes 4.8 seconds to reach the ground then … a) What was the height of the balloon at the moment the stone was released? b) What is the height of the balloon at the time ...

*February 20, 2017*

**Science**

Pretty sure its kinetic potential energy

*May 14, 2013*

**chem**

after 30 days 50% of the sample would have decayed. 50% / 30 days gives you a daily decay rate of 1.6666667. multiply this by 16.2 to give 27. 27 is the percentage of the sample that has decayed after 16.2 days so 100-27 = 73%

*April 27, 2013*

**math probablity- Respond as soon as possible**

This is because each pregnancy is independent of the others so the chances of receiving either a boy or girl is 50% for each separate pregnancy. the same as flipping three coins, the chances of having either heads or tails is 50% and each flip is independent of the others.

*April 26, 2013*

**Economics**

I don't know

*April 7, 2013*

**chemisry**

metallic bonds are not fully broken until the metal has first melted and then boiled. the boiling points of sodium, magnesium and aluminium are 890 c 1110 c and 2470 c respectively what does this suggest about the srengths of the metallic bonds in these three elements? please ...

*August 22, 2012*

**physic:(**

Wow this one is tough

*December 13, 2011*

**physics**

13281.34130 fpp

*October 14, 2011*

**math**

LEt f and g be continous functions with the following properties i. g(x) = A-f(x) where A is a constant ii. for the integral of 1 to 2 f(x)dx= the integral of 2 to 3 of g(x)dx iii. for the integral from 2 to 3 f(x)dx = -3A a find the integral from 1 to 3 of f(x)dx in terms of...

*February 14, 2011*

**Physics**

A doctor uses an insulated backpack to “hike in” vaccines to a rural village in Papua New Guinea that is too remote for vehicular traffic. The vaccines are kept cold by packing them in 10 kg of ice. If the backpack absorbs heat (leaks cold) at a rate of 12 J/s, how ...

*December 5, 2010*

**physics**

A basketball player runs down the court, following the path indicated by the vectors A, B, and C in Figure 3-35. The magnitudes of these three vectors are: A = 12.0 m, B = 20.0 m, and C = 7.0 m. Let the +x axis point to the right and the +y axis point to the far side of the ...

*November 3, 2010*

**transportation**

Yes it is possible. A number of alternative fuels including corn-based ethanol have been considered and even tested. However, because of the sensitivity of today's aircraft engines and the need to operate in a wide range of conditions (eg. temperature), alternatives such ...

*October 7, 2010*

**science**

Filtration

*October 7, 2010*

**8th grade**

Could be an infinite number of answers. The perimeter of a rectangle is 2(width + length) For example if the width is 3y and length is 1y, then the perimeter would be 8y. Check to see if there is any other information given in your problem.

*October 7, 2010*

**3rd grade math (array)**

Start by knowing the number of counters (4 x 4 = 16). To make an array of more than 1 counter in a row, you want to find the factors of 16. You know that the factors are 1,2,4,8,16, but since you are not allowed to have an array with only one counter, your choices are 2 and 8...

*October 7, 2010*

**chemistry**

What is the mass/vol % ethanol in an ethanol-water solution with density of 0.875 g/ml and containing 65.0% ethanol by volume? The density of pure ethanol is 0.789 g/ml.

*June 27, 2010*

**chemistry**

I apologize but the rest of the answer choices are: D)260 mmHg E)933 mmHg

*June 27, 2010*

**chemistry**

Pressure of pure A at 85 (degrees)C is 500 mmHg, what is the vapor pressure of pure B at this temperature? A)336 mmHg B)960 mmHg C)576 mmHg

*June 27, 2010*

**chemistry**

The Vapor pressures of pure propyl alcohol and isopropyl alcohol are 21.0 mmHg and 45.2 mmHg, respectively, at 25 (degrees)C. Calculate the partial pressure of isopropyl alcohol above a solution in which the mole fraction of propyl alchol is 0.250.

*June 27, 2010*

**chemistry**

Soutions are made that contain 0.1 moles of each of the following compunds below in 100 of H2O. Choose the compounds whose solutions will have the lowest freezing point. A)MgCl2 B)MgSO4 C)KClO3 D)CO2 E)NaBr

*June 27, 2010*

**chemistry**

85.0 grams of potassium bromide are to be used to produce a 0.300M solution. What will be the total volume of this solution?

*June 26, 2010*

**chemistry**

An aqueous solution containing 12.0% MgCl2 by mass has a density of 1.105g/ml. What is the mol fraction of water in this solution?

*June 26, 2010*

**chemistry**

what mass in grams of a molecular substance (mole weight=50.0g/mol) must be added to 500g of water to produce a solution that boils at 101.56(degrees)C?

*June 26, 2010*

**Chemistry**

8. Hydrogen and oxygen gas combine explosively to produce water. Write a balanced chemical equation for this process. If 10 mol of hydrogen reacted with oxygen, what volume of liquid water could be produced?

*May 3, 2010*

**Chemistry**

3. How many molecules are in 1 L of water (assume that the density of water is 1g/ml)? (5 marks)

*May 3, 2010*

**Chemistry**

2. Olive oil is almost pure triolein (a molecule). The molar mass of triolein is 885 g/mol. How many olive oil molecules have you got in 500g of olive oil?

*May 3, 2010*

**chemsitry**

240 kj

*February 14, 2010*

**Basic math**

Is 51 divided by 13 3.9 or 3.92 when rounding for dollars as in giving pay increases. Do you take the highest amount?

*February 9, 2010*

**science**

who invented plastic

*January 10, 2010*

**math**

I gave a raise to an employee to $10.1955 do i round this off to $10.20 an hour or leave it as is.

*May 15, 2008*

**basic math**

Thank you Ms Sue

*May 15, 2008*

**basic math**

for a sum of 10.1955 do I round up or leave it as is

*May 15, 2008*

**Year 12 can't do year 7 simple math-help**

brothers homework question, he is up set and even i can't do, seams simple, but i just am not getting it. "If 2*6=4, 4*1=7 and 8*3=1, find the value of 5*5." thanks guys

*February 7, 2008*

**chem**

wikipedia-Raoultlaw try that

*February 7, 2008*

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