/sci/ - Science & Math

hi, I'm doing a research about graphene and i want a article to help me produce graphite oxyde,
what i want from you is this article:

>Bottom-up synthesis of large-scale graphene oxide nanosheets

>http://pubs.rsc.org/en/Content/ArticleLanding/2012/JM/c2jm15944a

i realy need this article but I don't have money to buy this and I couldn't find this for download

if someone can help me and get this for me I would be very glad, Thx

Does anyone here have a reference for Franklin mocking the structure of DNA?

>>5092919
can you do it for me?

Hey /sci/, I am about to start college math, my math skills however are terribly inadequate, are there any online programs that you guys would recommend to bring up my skills.

Write equations used and work to solve answers
1) A box weighing 210 N is pushed up an incline plane that is 3.0 meters long. A force of 140 N is required. If the box is lifted 1.0 m, what is the efficiency of the inclined plane?

2) A figure skater with arms drawn spins on the ice at a rate of 5.0 rad/s and has a moment of inertia of 1.875 kg*m^2 . What is the angular momentum of the skater?

3) A 1,500kg truck moving at 15 m/s strikes a 750 kg automobile stopped at a traffic light the vehicle. The vehicles hook bumpers and skid together at 10 m/s. What is the decrease in kinetic energy?
4) A uniform bridge span weighs 50,000 N is 40 m long. An automobile weighing 15,000 N is parked with its center of gravity located 12 m from the right pier. What upward support force is provided by the left pier?

5) A 61 kg student sits at a desk 1.25m away from a 70 kg student. What is the magnitude of the gravitational force between the two students?

6) A tire has an initial angular velocity of 8∏ (pi) rad/s and slows at a rate of 2 rad/s. What is the angular displacement as it comes to a stop?

7) A rubber stopper of mass m2 = 0.020 kg is tied to a string an allowed to revolve in a circle of radius of 0.95 m. There is a mass of m1 = 1.00 kg hanging from the bottom providing a centripetal force. Calculate the linear (tangential) speed of the rubber stopper.

8) A rollercoaster car speeds up and down a hill past points a, b, and c as shown. The car has a mass of 500 kg and a speed of 25.0 m/s at point B where the track radius is 10 m. A: What is the maximum speed the car can have at point c, radius 19.6 m, for the gravitational force to hold it on the track? Use g = 10.0 m/s^2

9) On the planet Xenos, an astronaut observes that a seconds pendulum with a mass of 2.0 kg and a length of 1.216m oscillates with a period of 2.00 seconds. What is the free-fall acceleration on the planet xenos?

Howdy /sci/. Here's my power series
(summatory from n=1 to infinite) ((x)^(2n+1))/(4n^4 -5n^2 + 1)

The convergence radius is r=|1|. It converges for r=1, but how about r=-1? How do i prove it does not converge here?