Tuesday
September 27, 2016

Posts by c

Total # Posts: 413

Cosmology
What explains the observation that galaxy clustering is stronger at higher redshifts, which is an apparent reversal of the trend out to about z ~ 1? It is difficult to measure peculiar velocities Rich clusters have more galaxies than poor clusters Density contrast seems to ...
March 1, 2013

Cosmolgy
Which of these is the correct relationship between b, the bias factor, the fluctuations in mass (Δρ/ρ)mass and the fluctuations in light (Δρ/ρ)light? b2(Δρ/ρ)light = (Δρ/ρ)mass−1 (Δρ/ρ)light (&#...
March 1, 2013

Cosmology
What can we say about the future evolution of irregular clusters? They will become less centrally concentrated and assume a roughly uniform spatial density. They are not yet in a dynamical equilibrium, but will likely reach it eventually. They will keep contracting until they ...
March 1, 2013

Cosmology
magine you look through a really strong telescope and see a rich cluster. Your telescope is so good that you can see a single galaxy at the center of the cluster. What can you say about that galaxy and be pretty confident that you are correct? It has mass smaller than that of ...
March 1, 2013

Cosmology
We see less cluster evolution at larger redshifts
March 1, 2013

Cosmology
Which of the following is evidence that the evolution of disk galaxies can be greatly affected by their large scale environment? Comparison of emissions from elliptical galaxies in x-ray and optical bands Hydrogen gas deficiency in spiral galaxies near cluster cores The ...
March 1, 2013

Cosmology
The Hubble sequence is useful for distinguishing galaxies on the basis of many properties. Which of these does not correlate well with Hubble type? stellar age dust content luminosity color
March 1, 2013

Cosmology
Which type of emission closely traces the star-forming regions of a galaxy? none of these coronal X-ray emission 21 cm emission molecular CO emission
March 1, 2013

Cosmology
Which of the following statements is not true of spiral arms: they tend to trail the rotation of the galaxy they are sites of star formation they are amplified by resonances between the epicyclic frequencies of stars and the angular frequency of the spiral pattern they arise ...
March 1, 2013

geometry
triangle abc is similar to def, the lengths of the sides of triangle abc is 5,8,11. what is the length of the shortest side of triangle def if its perimeter is 60?
February 28, 2013

Geometry
line segment ab is the diameter of circle O whose center has coordinates (6,8) . what are the coordinates of point b if the coordinates of point a are (4,2)
February 28, 2013

Geometry
line segment ab is the diameter of circle O whose center has coordinates (6,8) . what are the coordinates of point b if the coordinates of point a are (4,2)
February 28, 2013

physics
a 57 g of copper is at 12 degrees celsius, if 1012 J of energy is added to the copper, what is the final temperature of the copper?
January 15, 2013

physics
a 57 g of copper is at 12 degrees celsius, if 1012 J of energy is added to the copper, what is the final temperature of the copper?
January 14, 2013

Chemistry
not right after the conversion 1KJ/mol=1.03*10^-2EV
January 12, 2013

chemistry
its not right with 39.2 and after conversion with 1KJ/mol=1.03*10^-2EV. Any ideas or thoughts on b)?
January 12, 2013

Chemistry
Thanks for a) any thoughts on b)?
January 11, 2013

Chemistry
So what is a) and what is b)?
January 11, 2013

Chemistry
conversion for seconds to hours is 60*60 or multiply 3600.
January 11, 2013

Chemistry
How do you input the data into the formula?
January 11, 2013

Chemistry
not right
January 11, 2013

Chemistry
Shown below are several options for the box notations of the ground state electron configuration of the following gas-phase species. Identify the correct electronic configuration. i. Al2− ii. Mn (a)Select the reason that best explains why the first ionization energy ...
January 11, 2013

Chemistry
Which is the higher density of polyethylene, linear or branched? Select the choice with the best accompanying explanation. Linear polyethylene is the higher density form, as the chains are able to pack better and partially crystallize, resulting in better packing and higher ...
January 11, 2013

Chemistry
pls. c
January 11, 2013

chemistry
Shown below is a schematic representation of the water-ethanol phase diagram. Making reference to the phase diagram, explain in a few sentences how one could enrich a solution of 15 percent ethanol - 85 percent water to a composition of 60 percent ethanol - 40 percent water. ...
December 21, 2012

chemistry
pls. tell
December 14, 2012

Chemistry
1) Cubic 2) Simple cubic 3) Cs+Cl− pair
November 24, 2012

world history
If you mean Britain was the archenemy of the USA and France. Then lets check the two country out.(A quick breakdown) USA fought two wars with Britain but due to WWI, Britain became allies with the USA for support and troops and the WWII as the Axis/Japan bomb Pearl Harbor. ...
November 22, 2012

Chemistry
(a) is right and the (b)?
November 22, 2012

Chemistry
Your x-ray lab has a monochromator consisting of a single crystal of nickel cut so that the (001) plane lies in the cube face. At what angle (in degrees) should the cube face be tilted with respect to the incident beam in order to select radiation with a wavelength λ=3....
November 22, 2012

Chemistry
Thank you!
November 22, 2012

Chemistry
Thanks for the help but it Wasn't right!
November 22, 2012

Chemistry
Name the following crystallographic features below using proper crystallographic notation. Image One [2ˉ21] [1ˉ12ˉ] [1ˉ1(1/2)] [(1/2)(1/2ˉ)1ˉ] Image 2 (1ˉ02) (21ˉ0) (201) (1ˉ02ˉ)
November 22, 2012

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

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

Math
thanks!
September 5, 2012

Geometry
12x
July 14, 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

Speech
Hgbhh N
February 29, 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

Standard Form
1.32•10^-5
October 10, 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

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