Monday

April 21, 2014

April 21, 2014

Total # Posts: 345

**physics**

An incident X-ray photon of wavelength 0.2800nm is scattered from an electron that is initially at rest. The photon is scattered at an angle of 180.0 degrees and has a wavelength of 0.2849nm. Use the conservation of linear momentum to find the momentum gained by the electron. ...

**chemistry(vapor pressure)**

When a student plotted ln [vapor pressure of a gas] vs. inverse Kelvin temperature, she obtained a straight line with a slope equal to -20000 K. According to the Clausius Clapeyron equation, (triangle)Hvap is ? kJ/mol

**Chemistry.. help plz**

whats the anwser?

**Microbiology**

Molecular chronometers are used to determine the course of evolution. Explain in full what these are and how they are used. Why, even with this "tool", is evolution still so complex?

**Microbiology**

You have a debate in your study group whether rRNA alone can be used to determine the relatedness of organisms up to species level. Explain IN FULL whether you agree or disagree.

**History**

What is the offical name of modern china?

**Algebra.**

The sum of 6 times Jack's age and 5 times Larry's age is 63. Jack is 1 year less than 3 times as old as Larry. Find eachh of their ages.

**math**

Can someone please help me with my question? I don't understand how to find the line of best fit.

**math**

Okay, thanks.

**math**

Thank you, but I have another question. Would I have to square root r^2, because how else would I find the value or r?

**math**

I don't understand this problem at all. It involves finding the line of best fit. The question says, for a set of data, the line of best fit is y= -3x-4 and that r^2 is 0.22. What is the correlation coefficient? I don't know how to solve this.

**Pre-Algebra**

Simplify 8Y^2 - 3Y + 3Y^2 - 4Y + 12

**Pre-Algebra**

Simplify: -2W+4R-W+-10R+6

**Pre-Algebra**

-7(p-3)+2p=24

**Math**

-4-5-7h=49

**Science**

I did a science experiment on batteries. I ran five brands of AA Alkaline batteries until they would no longer run a small light bulb. I measured the voltage of each battery every hour. I did this experiment four times using the same type of light bulb and the same brand of ba...

**chemistry**

please anwser this

**chemistry**

the structure is not angular in water

**chemistry**

its not D

**science**

when sedimentary rock is buried it may change into metamorphic rock. describe two causesof this change.

**physics!**

The mass of an automobile is 1160kg, and the distance between its front and rear axles is 2.54m. The center of gravity of the car is between the front and rear tires, and the horizontal distance between the center of gravity and the front axle is 1.02m. Determine the normal fo...

**Algebra**

what is the y-intercept of the line with a slope of -3 and a y-intercept of -5? How so i do this problem?

**Social Studies**

I am doing a crossword puzzle. One of the questions was "The electoral college was developed because some of the founding fathers believed that too much democracy was a very ____thing

**science**

how do pesticides affect fertilisers herbicides in a food web? help!

** Biology 1010**

intermediary metabolites enters the ciric acid cycle and is formed, in part, by the removal of a carbon (co2) from one molecule of pyruvate

**math**

wHAT ARE THE PRIME FACTORARIZATON OF 180?

**ECONOMICS---- & desperate !!!!!**

Last one... I've done so many that I'm simply mind-boggled as of now! Until the early 1980's, Japan required its large insurance companies to invest all of their vast holdings in Japanese securities. At the prompting of the U.S. , Japan relaxed the restrictions and...

**ASAP-before we were free**

Hope you can find something. I went to 3 different sites I know of but nothing came up for that book.

**Economics**

Last one... I've done so many that I'm simply mind-boggled as of now! Until the early 1980's, Japan required its large insurance companies to invest all of their vast holdings in Japanese securities. At the prompting of the U.S. , Japan relaxed the restrictions and...

**Economics**

Last one... I've done so many that I simply mind-boggle as of now! Until the early 1980's, Japan required its large insurance companies to invest all of their vast holdings in Japanese securities. At the prompting of the U.S. , Japan relaxed the restrictions and allowe...

**Economics**

Go to the website w w w .u s t r . g o v From this site, what are some of the key trade issues for the U.S. government today?

**maths**

40= 5x+2y+z 16=x+z 10=x+y solve for x x=10-y plug into 2nd equation 16=10-y+z z=6+y plug into first 5(10-y)+2y+6+y=40 y=8 plug in.. 10=x+8 x=2 2+z=16 z (vase)=14

**Spanish**

The crisis of the Roman Empire facilitated the invasion from Spain from the year 409 d.C., by various towns "barbaric" Germans.

**Calculus**

Use the position function s(t)=-4.9t^2+ 150, which gives the height (in meters) of an object that has fallen from 150 meters. Teh velocity at time t=a seconds is given by: lim as t approaches a s(a)-s(t) divided by a-t a) find the velocity of the object when t=3 b) at what vel...

**French**

Could anyone direct me to some websites that tell the differences between French and American Schools? Not necessarily the education process but schools in general. For example French students go to school six days a week as opposed to the American five-day school week.

**Anatomy and Physiology**

Why is the epidural space absent in the brain? Since this is not my area of expertise, I searched Google under the key words "brain 'epidural space'" to get these possible sources: http://depts.washington.edu/anesth/regional/epiduralspacetext.html http://en.w...

**English**

can you help me unscramble this word?? PERMANSU It's a bird, its a plane, its .... So if you didn't get that hint, so soak in a Kryptonite hot tub.

**analogies**

actress

**Math**

I need help with this specific proof: Given: CE bisects Angle ABD FB and CE are strraight line segments Prove:angle x = Angle a

**french- subjontif**

ok! i have a huge french test comming up in 2 days and i need help with memorizing the subjontif and imparitif of a verb as well as infinatif. (sorry, i cant spell!) Thank you for using the Jiskha Homework Help Forum. To memorize, you need to analyze what type of learner you a...

**hard math**

please someone help me! i've tried so hard! factor m^6 + n^2 28x^2y^2 - 7x^4 8x^3y^3 +343z^3 thank you so much!!! For the second one: 28x^2y^2 - 7x^4 Factor out 7x^2: 7x^2(4y^2 - x^2) Now we try to factor 4y^2 - x^2, which is: (2y + x)(2y - x) We end up with this: 7x^2(2y ...

**tricky psychology**

what do agonists do? in comparison with older people babies a. sleep more fitfully, they tend to wake up more often b. sleep more deeply, they spend more time in stages 2 and 4 sleep c. spend more time in the rem stage than any other sleep stages d. spend more time in stage 1 ...

**FRENCH! HELP!**

so i have this french test tomorrow on imparitive, and subjonctif. i have had a lot of trouble remembering them, and telling them apart. can anyone help!? that would be fantastic! thank you so much! its urgent! Imperative (note spelling) means giving a command or an order. The...

**algerbra**

x=1 y=23

**Science**

The answer is B. K9