Thursday

December 18, 2014

December 18, 2014

Total # Posts: 350

**chemistry**

Jiskha is not part of the MITx platform!!! How the honor code of MITx could be applied to an user of other system?
*November 18, 2012*

**chimistry**

p=h/lambda(meters) , E= p^2/2m + 1.659*10^-18, LambdaMax=hc/E
*November 18, 2012*

**Chemistry**

-422.24
*November 17, 2012*

**Chemistry**

10.4
*November 17, 2012*

**Chemistry**

(Kg og Na)/ 23*4 =X X * 47.88 = in g convert to Kg
*November 17, 2012*

**chemistry**

p=h/lambda(meters) , E= p^2/2m + 1.659*10^-18, LambdaMax=hc/E
*November 17, 2012*

**chemistry**

Jiskha is not part of the MITx platform!!! How the honor code of MITx could be applied to an user of other system?
*November 17, 2012*

**chemistry**

-422.24
*November 17, 2012*

**chemistry**

p=h/lambda(meters) , E= p^2/2m + 1.659*10^-18, LambdaMax=hc/E
*November 17, 2012*

**chemistry**

10.4
*November 17, 2012*

**chemistry**

(Kg og Na)/ 23*4 =X X * 47.88 = in g convert to Kg
*November 17, 2012*

**science**

p=h/lambda(meters) , E= p^2/2m + 1.659*10^-18, LambdaMax=hc/E
*November 17, 2012*

**science**

10.4
*November 17, 2012*

**science**

(Kg og Na)/ 23*4 =X X * 47.88 = in g convert to Kg
*November 17, 2012*

**science**

Jiskha is not part of the MITx platform!!! How the honor code of MITx could be applied to an user of other system?
*November 16, 2012*

**alegebra and graphing**

y=m=25
*November 12, 2012*

**physics**

kj kljh lkjhlkj h
*September 29, 2012*

**Math (Please help immediately)**

Last one I need help on: The measure of one angle is 38 degrees less than the measure of its supplement. Find the measure of each angle.
*September 6, 2012*

**Math (Please help immediately)**

Last one I need help on: The measure of one angle is 38 degrees less than the measure of its supplement. Find the measure of each angle.
*September 6, 2012*

**Math (Please help immediately)**

I figured it out already xD Thanks. I have one more
*September 6, 2012*

**Math (Please help immediately)**

Two angles form a linear pair. The measure of one angle is 8 times the measure of the other angle. Find the measure of each angle.
*September 6, 2012*

**Math (Please help immediately)**

Thank you
*September 6, 2012*

**Math (Please help immediately)**

The measure of one angle is three times the measure of its complement. Find the measure of each angle.
*September 6, 2012*

**chemistry**

What makes 3Ag2S+2Al(s)=Al2S3+6Ag(s) ?
*April 26, 2012*

**chemistry**

What makes #Ag2S+2Al(s)=Al2S3+6Ag(s) ?
*April 26, 2012*

**PSY**

Describing CPT Catergories Check Point
*April 22, 2012*

**physics**

Steel expands 11 parts in a million for each 1 degree C change. Consider a 40,000 km steel pipe that forms a ring to fit snugly all around the circumference of the Earth. Suppose people along its length breathe on it so as to raise its temperature 0.80 degree C. The pipe gets ...
*March 31, 2012*

**physics**

The weight of the atmosphere above 1 m^2 of Earth's surface is about 100,000 N. Density, of course, becomes less with altitude. But suppose the density of air were a constant 1.2 kg/m/s^3. Calculate where the top of the atmosphere would be.
*March 31, 2012*

**physics**

Estimate the buoyant force that air exerts on you. (To do this, you can estimate your volume by knowing your weight and by assuming that your weight density is a bit less than that of water.) Assume that your weight is a about 1000 N, for example.
*March 31, 2012*

**statistics**

how is statistics defined
*February 21, 2012*

**MATH**

COMPARINGUNIT RATES
*January 26, 2012*

**composition writing**

can i get a paragraph on 'An imaginary trip to the moon'?
*January 3, 2012*

**calculus**

A person drops a stone from a bridge. How high is the bridge if they hear the splash 4 seconds later. Assume the speed of sound is 1080ft/sec.
*November 13, 2011*

**physics**

ccccccccc
*October 20, 2011*

**science**

what is the morality of a solution made by dissolving 1.00g of sodium hydroxide, NaOH in 100 mL of water
*June 12, 2011*

**science**

what is the morality of a solution made by dissolving 1.00g of sodium hydroxide, NaOH in 100 mL of water
*June 12, 2011*

**science**

what is the morality of a solution made by dissolving 1.00g of sodium hydroxide, NaOH in 100 mL of water
*June 12, 2011*

**Math**

Lauren is pulling on a trunk with a 15-N force. Wayne pulls at right angles to Lauren. With how much force must Wayne pull to make the resultant force on the trunk 22 N? Round answer to one decimal place.
*June 2, 2011*

**statistics**

one of the major U.S. tire makers wishes to review its warranty for their rainmaker tire. The warranty is for 40,000 miles. The tire company beleives that the tire actually lasts more than 40,000 miles. A sample of 49 tires reveales that the mean number of miles is 45,000 ...
*May 16, 2011*

**physics**

An elastic cord is 69 {\rm cm} long when a weight of 79 {\rm N} hangs from it but is 90 {\rm cm} long when a weight of 170 {\rm N} hangs from it.What is the "spring" constant k of this elastic cord?
*April 29, 2011*

**physics**

In the figure , suppose C_1 = C_2 = C_3 = 18.0 <units>\mu F</units>.If the charge on C_2 is Q_2 = 33.0 <units>\mu C</units>, determine the charge on each of the other capacitors.
*April 26, 2011*

**Calculus**

Determine whether or not each of the following functions is invertible. Give your reasons for believing the function is invertible or not. Please check this for me. I am not sure if I am adequately explaining my answer and if my answer is right. a) y= log10(1 + 1/x) y'= ((...
*March 23, 2011*

**Calc. checking answer**

Correction to part a) NOT INVERTIBLE because I plugged in -0.5 and got a positive answer, so the derivative is then increasing and decreasing, right?
*March 23, 2011*

**Calc. checking answer**

Determine whether or not each of the following functions is invertible. Give your reasons for believing the function is invertible or not. Please check this for me. I am not sure if I am adequately explaining my answer and if my answer is right. a) y= log10(1 + 1/x) y'= ((...
*March 23, 2011*

**Physics**

The charged plates of a parallel plate capacitor each have a charge density of 3 x 10-3 C/m2. What is the electric field E between the plates?
*March 21, 2011*

**Physics**

A box of mass m which carries a charge Q slides down a frictionless inclined plane that makes an angle, theta, with the horizontal. An electric field E points from right to left. How large must E be for the acceleration down the incline to be zero?
*March 21, 2011*

**geometry**

A rectangle is 80 cm long and 20 cm wide. Find, to the nearest degree, the acute angle formed at the intersection of the diagonals.
*February 13, 2011*

**Algebra II**

How can equations and inequalities help a business maximize profit or minimize cost?
*February 1, 2011*

**calculus**

find linear approximations for each of the following and put a bound on the error of the estimate. 1. (7.985)^1/3 using f(x)=x^1/3 and a=8 2. (.9997)^100 using f(x)=x^100 and a=1 please help explain please too
*December 9, 2010*

**calc**

find linear approximations for each of the following and put a bound on the error of the estimate. 1. (7.985)^1/3 using f(x)=x^1/3 and a=8 2. (.9997)^100 using f(x)=x^100 and a=1 please help
*December 9, 2010*

**Physics**

What is the difference in blood pressure (mm-Hg) between the top of the head and bottom of the feet of a 1.008 m-tall person standing vertically?
*December 8, 2010*

**physics**

dragonballs
*December 6, 2010*

**Science**

My teacher has asked our class to each do a 2 minute light and sound show using four different concepts... Any ideas?
*November 17, 2010*

**Physics**

The U.S army's parachuting team, the Golden Knights, are on a routine jumping mission over a deserted beach. On a jump, a 65 kg Knight lands on the beach with a speed of 4.0 m/s, making a .20 m deep indentation in the sand. With what average force did the parachuter hit ...
*October 24, 2010*

**Calc**

When you are solving for the point of intersection between planes do you follow the same steps when solve for the point of intersection between lines?
*October 17, 2010*

**Algebra 2**

Complete the system for the given number of solutions: x+y=7 2x+2y = ? infinite number of solutions
*October 13, 2010*

**physics**

A tiger leaps horizontally from a 5.5 m high rock with a speed of 3.1 m/s. How far from the base of the rock will she land?
*October 4, 2010*

**calculus**

Determine the coordinates of the point of intersection of the two perpendicular lines that intersect on the y-axis and are both tangent to the parabola given below. y = 3x2
*October 3, 2010*

**Microbiology**

Utilization of amylase producers is “big business” can you find or think of any uses for the amylase production? [think of the high soda consumption in the U.S., what makes it so sweet?]
*September 20, 2010*

**physics**

The pronghorn antelope has been observed to travel at an average speed of more than 55 km/hover a distance of 6.0 km. Suppose the antelope runs a distance of 6.0 km in the following manner: it travels 2.0 km in one direction, then turns 90 degree and runs another 4.0 km. ...
*September 12, 2010*

**geometry**

ab=3x, bc=5x, ac=8 what is x and bc?
*September 10, 2010*

**Chemistry**

Thank you
*September 9, 2010*

**Chemistry**

Ephedrine, which is used as a bronchodilator, has the chemical formula C10H15NO. What mass of H2O would be produced during a combustion analysis of 0.4817 g of ephedrine? Answer in units of g.
*September 9, 2010*

**Algebra 117**

Sorry for whatever reasons my sq root symbols didn't paste here. The problem is sq rt a + sq rt b = sq rt a+b. I think this is true, but I'm not sure why.
*September 9, 2010*

**Algebra 117**

Is this equation true or false? Why? ãa+ãb=ãa+b Okay radicals are killing me. Please explain this to me
*September 9, 2010*

**Algebra**

Is this equation true or false? Why? 20-4ã2=16ã2 With like radicands should I add the 4 to the other side of the equation? I'm really lost. Can someone please explain this to me?
*September 9, 2010*

**math**

Write the word or phrase that best completes each statement or answers the question. Provide an appropriate response. The two most frequently used measures of central tendency are the mean and median. Compare these two measures for the following characteristics: Take every ...
*September 3, 2010*

**physics**

Ab = V²/2x = -88²/(2*146) = -26.52 ft/sec² Aa = 2x/t² = 2(5280/4)/19.9² = 6.666 ft/sec² V = √[2ax] = √[2*6.666*5280/4] = 132.658 ft/sec = 90.4 mph t = √[2x/a] = √[2*5280/(4*26.52)] = 9.98 sec
*September 1, 2010*

**Psychology**

the answer is not cases
*September 1, 2010*

**Chemistry**

but one of those false true trues are wrong, just don't know which one
*July 12, 2010*

**Math: partial derivative**

z=u(v+w)^(1/2) find ∂^3z/(∂u∂v∂w) what partial derivative am I suppose to be finding exactly? Do I take the derivative of z three times? Please help. Thank you.
*July 11, 2010*

**chemistry**

171kj q=molesx heat of vaporization
*May 12, 2010*

**human service**

There are 8 important issues in fee setting within a Human Service Organization and these are those issues: 1. Direct and indirect costs 2. Depreciation and use allowance 3. Unallowable costs 4. Profit margins 5. Fixed and variable costs 6. Break-even points 7. Market prices 8...
*May 4, 2010*

**Chemistry**

p=h/lambda(meters) , E= p^2/2m + 1.659*10^-18, LambdaMax=hc/E
*April 5, 2010*

**math 12**

While training for a race, a runner increases her distance by 10% each day. If she runs 2km on the first day, what will her total distance for 26 days of training?
*March 17, 2010*

**statistics**

Considering that a researcher can test at the <p = .05 (95%), p = .01 (99%), or p = .001 (99.9%) level for statistical significance, how would you use these three levels in relationship to risk to patients in implementing the decisions of your research?
*March 5, 2010*

**Math**

Determine whether the given conditions are sufficient to prove that ∆PQR ∆MNO.Justify your answers. PQ≅MN,PR≅MO,QR≅NO I have no idea how to do this! Can anyone help me. Thank you
*February 14, 2010*

**Chemistry**

okk sorry amy. ps: ive never used this before ms. sue, so dont be rude.
*February 9, 2010*

**Chemistry**

also for percent yield i thought it was (actual results)/(theoretical results) X 100, so wouldnt it be 126.5g/ 55g=230??
*February 9, 2010*

**Chemistry**

well my question is the same as amy's but mine says: Determine the mass of gold that can be extracted if 24.7 g sodium cyanide is used. and If the mass of the ore from which the gold was extracted is 129.5 g, what percentage of the ore is gold? but i tried her numbers. ...
*February 9, 2010*

**Chemistry**

is this the right answer for mass of gold extracted then : 77.0 g ?? and 164.3 % percent yield??
*February 9, 2010*

**science**

help me unscramble iritoncf
*February 4, 2010*

**History**

What are some good, recent books on the Crusades that are well-suited for use in a research paper?
*January 23, 2010*

**college Managerial accounting**

Problem 47 Simon Hinson Company operates two divisions: Gordon and Ronin. A segmented income statement for the company’s most recent year is as follow: Total Company Gordon Division Ronin Division Sales $850,000 $250,000 $600,000 Less variable expense 505,000 145,000 360,...
*January 7, 2010*

**bRAIN FART**

Add all sides. Add the two lengths and the two widths.
*November 9, 2009*

**Chemistry**

wait.. that can't be right.
*November 9, 2009*

**Chemistry**

Given a 10.0g sample of MgCO3*5H2O, what weight of anhydrous magnesium carbonate can be obtained after driving off the water? 84.3g?
*November 9, 2009*

**Chemistry**

Given a 10.0g sample of MgCO3*5H2O, what weight of anhydrous magnesium carbonate can be obtained after driving off the water? The GFM of the sample is 174.3amu. Now.. how do I go about finding the weight of the magnesium carbonate?
*November 9, 2009*

**Chemistry**

CaSO4.2H2O ==> CaSO4 + 2H2O moles CaSO4.2H2O = 15.00 g x (1 mole CaSO4.2H2O/172.172) = 0.08712 moles. moles CaSO4 = same. grams CaSO4 = moles CaSO4 x molar mass CaSO4 = ?? Wait,.. how do I know the moles CaSO4? do I do .08712* CaSO4's gfm?
*November 9, 2009*

**chemistry**

so then would i find the gfm of the CaSO4? and get 136.2 as my answer?
*November 8, 2009*

**chemistry**

if you heat 15.00g of the hydrate CaSO4*2H20, and drive off the water, what is the weight of the anhydrous salt remaining? How do I go about solving this?
*November 8, 2009*

**Chemistry**

calculate the percent water in CaSO4*2H20 20.9%?
*November 8, 2009*

**Chemistry**

Ah, yes. I reversed it Thank you!
*November 8, 2009*

**Chemistry**

on heating the hydrate CaSO4*2H2O, how many moles of water should be driven off per mole of hydrate? 1 mole?
*November 8, 2009*

**Chemistry**

34.48%, percentage water of hydrate, final answer?
*November 8, 2009*

**physics**

A race car accelerates from rest at 5.7m/s squared. how fast will it be going at the end of that time? i need the abc method...( a-all variables, unknown 1st...b-right formula and algebraically rearrange it..c- solve it0
*October 20, 2009*

**HCA 240**

Radio Ad: Write a 150 to 200 word script for a radio ad that promotes a healthy musculoskeletal system in old age. Address the risk factors for arthritis, osteoporosis, and injuries from falls. Incorate prevention strategies such as proper nutrition (calcium, diet).
*September 13, 2009*

**history**

Struggling to answer completely and logically, please critique the below: Question: What were the similarities and differences between the five regions of British Colonial America and what factors worked to create a shared “American Identity” by the mid 18th century...
*September 9, 2009*

**5th grade Math**

i do not know
*September 4, 2009*

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