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by: Sophie Stella

physnotesweek4.pdf PHYS 104-01

Sophie Stella

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Notes for week 4 of PHYS 104: Astronomy, with Dr, Ruch
Dr. Ruch
Class Notes
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Popular in Astronomy

Popular in Astronomy

This 2 page Class Notes was uploaded by Sophie Stella on Sunday March 6, 2016. The Class Notes belongs to PHYS 104-01 at University of St. Thomas taught by Dr. Ruch in Winter 2016. Since its upload, it has received 31 views. For similar materials see Astronomy in Astronomy at University of St. Thomas.


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Date Created: 03/06/16
PHYS 104: Astronomy Week 4 Course Notes, 2/22 – 2/26 Definitions Momentum: Mass of an object times the velocity. mv Kinetic Energy: Energy of an object with respect to its motion. Potential Energy: Energy of an object with respect to position or arrangement of a system. Radiative Energy: Energy transmitted through particles by waves. III. Conservation Laws A. Momentum P=mv 1. In a closed system, momentum is always conserved. a. This means that the amount of momentum will never change from the beginning of an event within a give system to the end. b. This includes systems where a gravitational force is involved. c. This also includes systems where energy is transferred. d. This only holds as long as there are no external forces on the system. B. Angular Momentum l=mvr 1. Closed systems also conserve angular momentum. 2. Angular momentum takes into account the distance of a massive object from its pivot point. IV. Energy A. All forms of energy fit into one or more of three types of energy: 1. Kinetic Energy K=(1/2)mv^2 a. Motion (for example) 2. Radiative Energy a. Light 3. Potential Energy a. Gravitational b. Chemical c. Springs / rubber bands d. Potential energy can be converted into either Kinetic or Radiative Energy. B. Mass Energy E=mc^2 1. Is a form of potential energy. 2. The total energy is the mass times the speed of light squared. C. Energy is conserved


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