Home | Department of Physics, Engineering Physics & Astronomy
Physics For Astronomy
-
Upload
keegan-washington -
Category
Documents
-
view
47 -
download
0
description
Transcript of Physics For Astronomy
![Page 1: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/1.jpg)
Arinto Yudi Ponco Wardoyo
![Page 2: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/2.jpg)
Standard system SI – Standard International◦Agreed in 1960 by International Committee
cgs – Gaussian System US System
![Page 3: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/3.jpg)
Length [ L] Mass [M} Time [T]
![Page 4: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/4.jpg)
Units◦SI : meter◦ cgs : centimeter (cm)◦US Customary : foot (ft)
Defined in terms of a meter – the distance traveled by light in a vacuum during 1/ 299,792, 458 of a second
![Page 5: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/5.jpg)
![Page 6: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/6.jpg)
![Page 7: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/7.jpg)
![Page 8: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/8.jpg)
![Page 9: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/9.jpg)
Gravitation constant G=6,67x10-11 Nm2kg-2
Sun mass = 1,989 x1030 kg Sun radius = 700 000 km Sun constant : Sun energy on the earth = 1380 w/m2
Sun luminosity = Lo= 3,86x1026J/s Fsun bolometrict =6,28x107 Js-1m-2
Stefan Boltzmann constant, σ=5,67x10-8 Js-1m-2K-4
Earth mass = 5,975x1024kg Earth radius = 6378 km Gravity constant g=9,8 m/s2
Moon mass = 7,343x1023kg Moon Radius = 1738 km 1 astronomical unit = 1,496x1011 m 1 parsec = 3,26x106 light year Light velocity C = 3x105 km/s
![Page 10: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/10.jpg)
![Page 11: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/11.jpg)
![Page 12: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/12.jpg)
![Page 13: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/13.jpg)
![Page 14: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/14.jpg)
![Page 15: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/15.jpg)
![Page 16: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/16.jpg)
IMPORTANT TO UNDERSTAND BASIC PHYSICS◦ Kepler’s Laws ◦ Newton’s Laws (inertia, F=ma, equal and opposite reactions)◦ Gravity, Newton’s Universal Law of Gravitation◦ Surface Gravity◦ Circular motion and orbits◦ Centripetal Force◦ How to get masses from orbital speeds◦ Escape Velocity◦ Conservation of energy, kinetic energy, potential energy◦ Conservation of angular momentum
![Page 17: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/17.jpg)
Angular Size
![Page 18: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/18.jpg)
I drop a 10kg mass and a 5kg mass from 4 feet off of ground.When to they hit?
a. same timeb. 10 kg mass hits firstb. 5 kg mass hits first
WHY? Hint: What is difference between mass and weight? Does acceleration due to gravity depend on mass?
![Page 19: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/19.jpg)
Vcirc GM
d
2
3
YR
AUBA P
aMM
How do you calculate the mass of a star if you can measure the orbital velocity of a planet orbiting around it?
![Page 20: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/20.jpg)
What happens if the string breaks? (INERTIA!)
![Page 21: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/21.jpg)
From Newton’s laws of motion and gravity, we can calculate the velocity necessary for an object to have in order to escape from a planet, called the escape velocity
Vesc 2GM
R
![Page 22: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/22.jpg)
![Page 23: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/23.jpg)
![Page 24: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/24.jpg)
![Page 25: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/25.jpg)
![Page 26: Physics For Astronomy](https://reader035.fdocuments.net/reader035/viewer/2022062314/56813715550346895d9e9f67/html5/thumbnails/26.jpg)