Tuesday

October 13, 2015
Total # Posts: 377

**Chemistry**

An x-ray generator operated at a plate voltage of 7000 V is incapable of producing Ni Kα radiation. Calculate the minimum energy required for a ballistic electron to produce Ni Kα radiation. Express your answer in units of eV.
*November 22, 2012*

**Chemistry**

CdO is cubic with a lattice constant a=4.695 A˚ and a density ρ of 8.15 g/cm3. Determine the crystal structure of CdO. Simple Cubic Face Centered Cubic Body Centered Cubic
*November 22, 2012*

**Chemistry**

Thank you
*November 22, 2012*

**Chemistry**

Calculate the density of atoms along [011] in molybdenum (Mo). Use only the information provided in your class Periodic Table, and express your answer in units of atoms/cm.
*November 22, 2012*

**Chemistry**

(a) Calculate the lattice constant a in palladium (Pd). Use only the information available in the class Periodic Table, and express your answer in angstroms. (b) Calculate the distance (in angstroms) between adjacent (110) planes in palladium (Pd). Hint: use your work from ...
*November 22, 2012*

**Chemistry**

Thank you!
*November 22, 2012*

**Chemistry**

The crystal structure of cesium chloride (CsCl) is shown in the figure below. The dark spheres represent atoms of Cl. Identify the crystal system: Cubic Tetragonal Orthorhombic Rhombohedral Hexagonal Monoclinic Triclinic Identify the Bravais lattice: Simple cubic Body ...
*November 22, 2012*

**chemistry**

thanks
*November 19, 2012*

**chemistry**

0.388e-6
*November 19, 2012*

**Chemistry**

thanks
*November 19, 2012*

**Chemistry**

1) True 2) False
*November 19, 2012*

**Chemistry**

The conduction band is at a higher energy than the valence band. True or false? No electronic states lie between the conduction and valence bands in n-type silicon. True or false?
*November 19, 2012*

**Chemistry**

thanks
*November 19, 2012*

**Chemistry**

thanks
*November 19, 2012*

**Chemistry**

thanks
*November 19, 2012*

**Chemistry**

Multi-electron Atom Ionization Energy, Conservation of Energy, Wave-Particle Duality.
*November 18, 2012*

**chemistry**

10.4
*November 18, 2012*

**chemistry**

(Kg of Na)/ 23*4 =X X * 47.88 = in g convert to Kg
*November 18, 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 18, 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 18, 2012*

**Chemistry :(**

10.4
*November 18, 2012*

**chemistry**

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

**psychology**

intelligence cannot be measured by paper and pencil tests.
*November 16, 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*

**math**

gdygvygvygyfdf
*June 27, 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*

**Physics**

@Ryan, is the "g" just gravity? Why do we need gravity in this equation? I keep doing this problem and getting the initial speed to 3.6 m/s which is not right.
*April 17, 2011*

**freedom similes and metaphors?**

As free as a bird on first flight As beautiful and precious as sparkling stars in the night
*April 3, 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*