Sunday

December 21, 2014

December 21, 2014

Total # Posts: 32

**3rd grade math**

Sven is thinking of two numbers. The sum is 12. The difference is 4. What are the two numbers?
*April 23, 2014*

**physics**

a motorboat is heading across a river at 6km/h in a direction making an angle 60 degree to the current. current is moving boat downstream at 3 km/h. what is the resultant velocity?
*September 26, 2012*

**history**

what is another name for a nation
*September 10, 2012*

**math**

Thanks
*September 4, 2012*

**math**

What is a 72 times 50. My answer is 3,600
*September 4, 2012*

**geometry**

The coordinates of triangle ABC areA(0,0), B(2,6), and C(4,2). Using coordinates geometry; prove that, if the midpoints of sides AB and AC are joined, the segment formed is parallel to the third side and equal to one- half the length of the third side.
*February 6, 2012*

**geometry**

The coordinates of triangle ABC areA(0,0), B(2,6), and C(4,2). Using coordinates geometry; prove that, if the midpoints of sides AB and AC are joined, the segment formed is parallel to the third side and equal to one- half the length of the third side.
*February 6, 2012*

**statistics**

4(0.4)K to the power negetive 0.6 L to the power O.6,over K)all in brackets
*August 21, 2011*

**statistics-varsity level**

(3L to the power 0.5. Over L to the power 2)all in brackets to the power 2 outside brackets?
*August 21, 2011*

**geometry**

Two sides of a triangle ABC have lengths 7cm and 9cm. Which of the following could not be the length of triangle ABC's third side
*April 3, 2011*

**Maths**

Any help with the following would be greatly appreciated. I don't understand how to use the information given to create the equation. 1) A car travels between A and B at an average speed of 60 km/h. If the car increased its average speed to 100 km/h it would take 10 ...
*April 21, 2010*

**Maths**

I'm really struggling with word problems right now. Got through 20 just three left. Can someone please give me some pointers or the first few steps? 1. A sum of money is divided between A, B and C in the ratio 1 : 2 : 3. However, before the money is divided C dies and it ...
*April 19, 2010*

**Maths**

Thanks!
*April 18, 2010*

**Maths**

Two bike riders X and Y both start at 2 pm riding towards each other from 40 km apart. X rides at 30 km/h, Y at 20 km/h. If they meet after t hours, find when and where they meet.
*April 18, 2010*

**social science **

To compare one person’s test scores to the scores of all other people who took the test, psychologists must know something about the test’s? projective nature subjective nature length norms
*December 21, 2009*

**Chemistry**

I did is again: Benzoic acid: q= m*Cs*T Cs = 4.217kJ/g°C q1 + q2 = 0 [m*Cs*T] + [26.38kJ] = 0 [.876g*Cs*8.518°C]+ [26.38kJ] = 0 7.462g°C * Cs = -26.38kJ Cs= -3.535kJ/g°C to get the molar enthalpy: -3.535kJ/g°C * 114g/mol= 403.03kJ/mol* °C
*October 9, 2009*

**Chemistry**

Benzoic is 26.38 and the temp rises 8.518
*October 9, 2009*

**Chemistry**

this is so confusing =(
*October 9, 2009*

**Chemistry**

36913.6 J/g * 114g/mol= -4208150.4J/mol and to convert that to kJ= -4208150400 kJ/mol. the correct answer is -5116 kJ/mol
*October 9, 2009*

**Chemistry**

Okie I get 36913.6J/g* degree C but how do I change that into kJ/mol?
*October 9, 2009*

**Chemistry**

Okie i get Cp= 42178.8J/g delta C and for the octanol im using q= m*Cs*T q= 0.876*Cs*8.158 q= 7.1395g degreeC * Cs In your work i don't understand thisequation: [mass octanol x specific heat octanol x delta T] + [Cp x delta T] = 0
*October 9, 2009*

**Chemistry**

The combustion of benzoic acid releases 26.38kJ/g and is often used to calibrate a bomb calorimete. The combustion of 1.045g of benzoic acid caused the temperature of the calorimeter to rise by 5.985 degreeC.Using the same calorimeter, a sample of 0.876g of C8H18 was burned. ...
*October 9, 2009*

**Chemistry**

What is the mass of La2(C2O4)3*9H2O, can be obtained from 650mL of 0.0170 M aq solution of LaCl3 by adding a stoichiometric amount of sodium oxalate. I don't know how to balance the equation for this..i started: LaCl3+ Na2C2O4 -> La2(C2O4)3*9H2O + NaCl
*October 9, 2009*

**chem**

If a student needs to prepare 50g of bromobenzene and expects no more than a 75% yieldl, how much benzene should the student begin with if the yield is 75%? C6H6(l)+ Br2(l) --> C6H5Br(l)+ HBr(g) I calculated the moles of C6H5Br as .3185. But ion the end my answer is 18.7g ...
*October 8, 2009*

**us history**

HOW DID THE THREE-FITHS COMPERMISED LEAD TO THE CIVIL WAR!
*October 1, 2009*

**science**

animals cause ___________________ weathering by burrowing in and moving underground soil around.
*September 29, 2009*

**CHEMISTRY!!-**

The following date were obtained for the reaction 2ClO2(aq)+2OH(aq)->ClO_3^-(aq)+ClO_2^-(aq) + H2O(l) where rate= delta[ClO_2]/ delta t [ClO_2]0 [OH^-1]0 Initial Rate (mol/L) (mol/L) (mol/L*s) .0500 .100 5.75*10^-2 .100 .100 2.30*10^-1 .100 .050 1.15*10^-1 a) Determin the ...
*February 10, 2009*

**URGENT MATHS**

Ok thanks. The problem is, I'm from Australia and we don't use those measurements. But I MIGHT be able to use other Australian measurements.
*February 1, 2008*

**URGENT MATHS**

I got 2 questions and I've been stuck on them for days and its due in 2 days. 1. For a quick way of doing multiplication, you can do: for example: 81 x 89=? First you do 1x9=9 in which case you have to add '0' in front of it to make it 09. Then you add 1 to any of ...
*February 1, 2008*

**science**

plz answer me
*October 6, 2007*

**science**

As temperature rises , solids generally become more soluble in water , but gases become less soluble .If a soft drink contains high concentrations of sugar and carbon dioxide , wich of the following may be expected to happen if it is cooled down ? 1. sugar may precipitate out...
*October 6, 2007*

**language arts**

what follows a linking or action verd After a linking verb, there'll be a predicate noun or predicate adjective: ~~She is my sister. (is=linking verb; sister=predicate noun) ~~Delilah is very tall for a fourth grader. (is=linking verb; tall=predicate adjective) After an ...
*September 28, 2006*

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