Wednesday

January 18, 2017
Total # Posts: 71

**AP CHEM**

How much time will elapse before the N2O5 concentration decreases from 0.078 mol/L to 0.038 mol/L? Answer in units of min. IM not sure how to set this up either.

*January 9, 2017*

**AP CHem**

If [N2O5]0 = 0.078 mol/L, what will be the concentration of N2O5 after 1.2 s? Answer in units of mol/L. I'm not sure how to even set this up or which equatiosn to use?

*January 9, 2017*

**AP Chem**

Dinitrogen pentoxide (N2O5) decomposes by first-order kinetics with a rate constant of 0.0064 s?1 at a certain temperature. What is the half life for the decomposition of N2O5 at this temperature? Answer in units of s. i did: ln(.003135/x)=(5/8.314)((1/300)-(1/487)) i got ....

*January 9, 2017*

**maths**

2 add 5 = 7

*November 13, 2016*

**maths**

141 cm

*November 13, 2016*

**maths**

how many pieces of cloth 120 cm long can be cut from a bolt of cloth 18 m in lenght

*November 13, 2016*

**math**

Hoe to simplify this Log72/75-log50/48+2log25/24

*September 17, 2016*

**math**

Prove that Log384/5+log81/32+3log5/3-log9= 2.

*September 16, 2016*

**math**

Simplify Log56/63-log100/108-log72/75

*September 16, 2016*

**maths**

Its right....thank u sir

*September 16, 2016*

**maths**

The ration of prices of two horses was 16:23.Two years later when the price of the first has risen by 10% and that of the second by rs.477, the ratio of their prices becomes 11:20. Find the original prices of the two horses.

*September 16, 2016*

**maths**

Evaluate: Log243/120-log54/75+log24/27-log5/2

*September 16, 2016*

**maths**

A person left 1/5 of his property to his wife, 1/2 of his property to his son and daughter to be shared in the ratio if 2:1 and remaining property to be given to his grandson and granddaughter to be shared in the ratio of 3:2.If that person had Rs 60,00,000 worth of property ...

*September 14, 2016*

**spanish**

what is the spanish word for folder

*August 30, 2016*

**maths**

In a class of 120 students 60 play tennis, 50 play polo,and 20 play both then how many neither play tennis nor polo?

*August 24, 2016*

**Language**

Thx Raina the helper I got 100%

*January 17, 2016*

**maths**

coin a is weighed so that the probability of throwing head is 2/3. coin b is weighed so that the probability of throwing a head is 1/4. coin a is thrown twice and coin b is thrown once. (I)show that the probability of obtaining exactly 1 head and 2 tails is 13/16

*April 18, 2015*

**Maths**

ann bought 5/8kg of tomatoes to make a salad dish 2/5 of the tomatoes were rotten and the rest were fresh what was the mass of fresh tomatoes

*April 1, 2015*

**Maths**

Nitin made some origami animals 5/8 of them were cranes and 1/6 of the remainder were frogs the rest were grasshoppers what fraction of the origami animals were grasshoppers

*March 31, 2015*

**Maths**

sonia had shells of three different sizes 4/9 of the shells were big and 2/5 of the remainder were medium sized the rest of the shells were small what fraction of the shells were small

*March 31, 2015*

**maths**

in a class 3/4 of the pupils wore spectacles 1/3 of the pupils who did not wear spectacles were boys what fraction of all the pupils were boys who did not wear spectacles

*March 31, 2015*

**Maths**

Jenny gave 1/6 of her salary to her mother and saved 2/5 of her remaining salary. what fraction of her total salary was saved

*March 31, 2015*

**Maths**

Ann bought 5/8kg of tomatoes to make a salad dish.2/5 of the tomatoes were rotten and the rest were fresh.What was the mass of fresh tomatoes.

*March 31, 2015*

**english**

hi, i am not good at english literature at all, i want a 5 pages story on micheal faryn novel spies. it is about details on how life was for civilians at time of world war 2. assingment should include information on rationing evacation blackoutand gas masks. it should be in ...

*February 1, 2015*

**Language Arts**

d

*January 30, 2015*

**Math**

So it equals -1 1/2

*November 17, 2014*

**Math**

I got 1.75

*November 17, 2014*

**Math**

1/2(1)-2

*November 17, 2014*

**Math**

7x-9=4x

*November 6, 2014*

**math**

A certain number between 10 and 100 is 8 times the sum of its digits, and if 45 be subtracted from it the digits will be reversed. Find the number.

*September 21, 2014*

**science**

1. Which of the following explains why your body may contain a carbon atom that was present in George Washington’s body in 1776? (1 point) Carbon moves in a one-way direction through living organisms only. Carbon moves in a one-way direction from the atmosphere and then ...

*January 21, 2014*

**science**

3. How would the carbon cycle be affected if all producers were removed? (1 point) Carbon compounds in animals would not be broken down to release carbon dioxide back into the atmosphere. Carbon would not have a way to enter the bodies of living things. Carbon dioxide levels ...

*January 21, 2014*

**PHYSICS**

Hi Daoine, My answer is 0.3289 atm, and I have temp. 10 degree c. This time I afraid to check answer because I don't know part b and c too, so I don't have more attempt. Is it right for 10 degree temp?

*January 11, 2014*

**PHYSICS**

Thank you for your help. I will try it again.

*January 11, 2014*

**PHYSICS**

Hi MM sorry to disturb you, but I just tried according to ur formula and still getting wrong. I used h-h_0= z= 10000m and T_0= 278, alpha=0.0065 and M=0.029 right?

*January 11, 2014*

**PHYSICS**

I used p=p_0*e(-M*g*h/R*T) but its wrong..Any help pls..:( where I used h=10km=10000m and temp.T= 273+10=283, M=0.029

*January 11, 2014*

**PHYSICS**

Hi MM, what is h and h_0?

*January 11, 2014*

**PHYSICS**

hey guys can you please tell the method for part a?

*January 11, 2014*

**PHYSICS**

please guys can you tell formula because I have temp. 10 degree C.

*January 11, 2014*

**PHYSICS(help)**

I used T=2*pi*sqrt(m/k) and I divided it by 2, but it was wrong. Please BBB can you tell more about it?

*January 10, 2014*

**PHYSICS(help)**

Hi Damon, so we have to find 'd' from this equation? and how to find time?

*January 10, 2014*

**Physics**

Thank you very much guys

*January 10, 2014*

**PHYSICS**

An electron is initially at rest in, but not on the axis of, a solenoid that is carrying a steady current I directed as shown in the cross section below (counterclockwise). The electron is initially at rest on the -x axis. The current in the solenoid is suddenly increased to ...

*December 17, 2013*

**Physics Important please**

Thank you very much

*November 8, 2013*

**Physics Urgent please help**

Hi, rickross I did 5, but I got wrong . I just multiply boron nucleus by electron, but it is wrong and now I am out of attempt. Thank you very much for your help. I am not doing 6 still. I don't know even how to start..I know due date is coming soon. I am still not getting...

*November 8, 2013*

**Physics Urgent please help**

I did this but I got wrong and now I am out of attempt. I already got 4 question wrong. I have two question remained 6 and 7 (spring one and other angle one). Can you help to solve these two?

*November 8, 2013*

**Physics Urgent please help**

Mangnesium nucleus is not 12e? is it 2e?

*November 8, 2013*

**Physics Urgent please help**

In addition to the Mg nucleus at x = 3 cm, another 3e charge is situated on the y-axis,3cm away from the origin in the +y direction.What is the magnitude of the Electric Field halfway between the Magnesium nucleus and the 3e charge on the y axis in N/C ?

*November 8, 2013*

**Physics ASAP PLease**

A spherical capacitor consists of a spherical conducting shell of radius b and charge -Q concentric with a smaller conducting sphere of radius a and charge +Q . Enter an expression for the capacitance of this device in terms of Coulomb's Constnat K_e (just type "k&...

*November 6, 2013*

**physics(help)**

does not be 2g(1-costheta)>gcostheta 2-2c0stheta>costheta? you wrote 1/2-1/2costheta>cosTheta

*November 1, 2013*

**Physics**

A small bead of mass m is constrained to move along a frictionless track as shown. The track consists of a semicircular portion of radius R followed by a straight part. At the end of the straight portion there is a horizontal spring of spring constant k attached to a fixed ...

*October 10, 2013*

**Public policy**

Evaluate how public policy decisions affect the receipt of revenues

*July 12, 2013*

**math**

This week Sage spent. 30 for hot dogs and supplies. he earned 18. did he make money are lose money this week?

*April 30, 2013*

**engineering**

Anybody knows the quiz3 of coursera "control of mobile robots"?

*February 11, 2013*

**Physics**

.25 m

*November 29, 2012*

**Math**

c.circumference

*November 14, 2012*

**geometry**

what is the slantheight of the square pyramid that can be curved out from a wooden cube of side 12cm?what is the lateral surface area?

*October 7, 2012*

**mathematics**

there are two wooden square prisms with base edge 8cm and height 12cm.from one of this prism ajesh curved outthe largest square pyramid.but from the otherrajesh curved out the largest cone.find the volume of the solids they curved out.whose product has greater volume

*October 6, 2012*

**mathematics**

what is the slantheight of the largest square pyramid that can be curved out from a wooden cube of side 12cm?find the lateral surface area of the pyramid so obtained?

*October 6, 2012*

**Trig**

sqrt(3)

*December 13, 2011*

**5th Grade Word Study**

buoy

*March 1, 2010*

**History**

Please help! I have to choose any 3 of the 13 colonies, and/or Missouri, Vermont, Kentucky, Ohio, Louisiana, Tennessee, as long as there is one chosen from each of the three regions (New England, South, and Mid-Atlantic/West) and explain: the founding, the economy, and the ...

*November 11, 2009*

**math**

you want to draw an enlargement of a design that is printed on a card that is 4 in. 5 in. you will be drawing this on a piece of paper that is 8 1/2 in. by 11 in. what are the dimensions of the largest complete enlargement you can make??? plz include explanation of how you got...

*December 9, 2008*

**geopmetry**

find this pattern: 10,40,90,61,52,63,94,46,18,001 and find the next 2 terms in the sequence

*October 2, 2008*

**geometry**

find this pattern: 10,40,90,61,52,63,94,46,18,100 and find the next 2 terms in the sequence

*October 2, 2008*

**geometry**

find this pattern: 10,40,90,61,52,63,94,46,18 and find the next 2 terms in the sequence

*October 2, 2008*

**math**

(x+y+5)+2x=180 find the value of x and y. please show you got the answers.

*September 29, 2008*

**math**

a local hardware store has a 10-gallon can of gray paint left over that is a mixture of 35% black paint and 65% white paint. how many gallons of white paint will be needed to make the gray mixture 20% black? note: answers must be 5 gallons, 7.5 gallons, 12 gallons, or 17.5 ...

*September 22, 2008*

**u.s. history**

what are the federalist papers???

*December 19, 2007*

**math**

i need help with this problem:2x-y=-4 -x-y=5 when you answer this question can you plz include the steps you did to get the final answer?

*November 1, 2007*

**the big idea of energy**

The big idea of energy is about the chemical reaction that takes place. According to the law of conservation of mass, “During an ordinary chemical change, there is no detectable increase or decrease in the quantity of matter.” Also, The Law of Conservation of Energy ...

*December 5, 2006*

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