Here are the more important screenshots from last week:
PhyFl18–SS2.2.1 Go ahead and back fill all the boxes behind the Boltzmanns (and Rockets).
PhyFl18–SS2.2.2 If you grade goes down after the A and B tests, you can get back in the game with GBB. Also, always keep up your Notebook, Packets, and stamps. If you do, you’ll end up with an A of B in class.
PhyFl18–SS2.2.3 problem 2.6.2
PhyFl18–SS2.2.4 Problem 2.6.5
PhyFl18–SS2.2.5 1st hour data
PhyFl18–SS2.2.6 2nd hour data
PhyFl18–SS2.2.7 3rd hour data
PhyFl18–SS2.2.8 6th hour data
PhyFl18–SS2.2.9 7th hour data
PhyFl18–SS2.2.10 A nice simple drawing capturing the essence of acceleration. Now we just have to graph it.
PhyFl18–SS2.2.11 The world’s first true physics equation. It’s about as far as Galileo got before receiving the glass from the Danes. The crazy thing was that he figured out the relationship between position and time for an object undergoing acceleration due to gravity and he did it all WITHOUT the benefit of graph paper because Rene Descartes hadn’t hadn’t been invented yet.
PhyFl18–SS2.2.12A One way to figure out which class got closest to the truth (in other words, who was the most accurate) is to look at what the acceleration should have been theoretically and then see what each classes acceleration really was. THis FBD of the forces acting on the ball will lead us to the correct theoretical value for acceleration. We will do lots of these FBD later in the year. They come in pretty handy.
PhyFl18–SS2.2.12B FBD’s are the most important thing you will learn in this class. DOn’t worry , this is just a preview. I’ll work this one this week to determine what the acceleration should be for the ball vs. what each class found it to be and we will see who gets the stamp.
PhyFl18–SS2.2.13 Love this quote.
PhyFl18–SS2.2.14 about right
PhyFl18–SS2.2.15 Look at the detail of the original (or one of the original) telescopes made by Galileo and Salviati (his assistant.)
PhyFl18–SS2.2.16 Some of the optics that wouldn’t be figured out until Newton did his early work with prisms.
PhyFl18–SS2.2.17 We discussed where all the energy in our solar system comes from in the core of the sun. This over simplified view of the fusion of protons is wrong . . .
PhyFl18–SS2.2.18 This is the correct flow chart.
PhyFl18–SS2.2.19 some of the byproducts of the nuclear fusion reaction in the core of the sun.
PhyFl18–SS2.2.20 The greatest irony of our solar system. Deadly gamma rays produced in the core of the sun is the source of all life on earth.
PhyFl18–SS2.2.21 It takes the gamma rays (wavelength around 10pm) anywhere from 50,000 years to 10 million years to get from the core of the sun to the surface of the sun (then only 8.2 minutes to get to earth). The deadly gamma wave is destructively interfered with by other wavelets of energy while it is on its outer journey inside the sun. When waves are destructively interfered with they lose some of their energy (which shows up as lower frequency). By the time the wave packet of energy that was originally 10pm in wavelength gets to the surface of the sun and is ready for the 8.2 minute journey to the earth its wavelengths are scattered somewhere between from 10nm (UV) to 1mm (far IR). So that original deadly gamma ray gives us our heat, our visible light and the still dangerous UV light.
PhyFl18–SS2.2.24 the journey of the deadly gamma ray
PhyFl18–SS2.2.26 It looks like at least three groups of physics students have taken on the task of hanging mars and venus somewhere in Norman.