ISCI 101 Week 2 Notes
ISCI 101 Week 2 Notes ISCI 101
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This 2 page Class Notes was uploaded by Charles Miller on Sunday September 4, 2016. The Class Notes belongs to ISCI 101 at James Madison University taught by Tom Devore in Fall 2016. Since its upload, it has received 68 views. For similar materials see Physics, Chemistry, and the Human Experience in Science at James Madison University.
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Date Created: 09/04/16
ISCI 101 Week 2 Sources of Energy: The Sun Earth’s Energy Balance Absorbed Sunlight= Emitted Infrared Radiation o If E in= E out then the earth has a constant temperature The Sun is not always producing a constant energy Types of Energy Kinetic energy= 1/2mv^2 Gravitational Potential Energy= mgh Other Forms of Energy Thermal Energy Chemical Energy Electric Energy Radiant Energy\ Nuclear Energy Magnetic Energy Elastic Energy Sound Energy Mechanical Energy Luminous Energy Mass (E=mc^2) The Law of Conservation of Energy Energy can be converted,but not created or destroyed Galileo 1638, created the interrupted pendulum, converted potential energy to kinetic energy and back again. o He discovered this in an attempt to improve the timekeeping technology of the era. Benjamin Thompson 1798, He observed heat generation during the boring of cannons and helped to establish the theory that mechanical motion could be converted into heat, and the conversion was quantitative and could be predicted. Von Mayer discovered that heat and mechanical work were both forms of energy and in 1845 published a monograph that stated a quantitative relationship between them. James Prescott Joule 1843, discovered the mechanical equivalent in a series of experiments. In the most famous , he showed that gravitational potential energy lost by the weight in descending was equal to the thermal energy gained by friction produced by the water and the paddle. The total amount of energy in an isolated system is said to be conserved over time. Energy can change its location within the system, ( chemical energy can become kinetic energy), but that energy can neither be created nor destroyed. The Sun Oil,coal,and gas are primarily stored sources of solar energy Properties of the Sun o Mass 2x10^30 Kg (330,000 earth masses) o Radius 7x10^8 m (109 earth radii) o Age 4.6x10^8 years o It is composed of 75% Hydrogen and 25% Helium o Power Output 3.9x10^26 watts o The output of the Sun is not constant and changes over time Light Visible light is electromagnetic radiation that is visible to the human eye, and is responsible for the sense of sight. Visible light has a wavelength from between 380mm to 740mm. Invisible infrared light has a longer wavelength and invisible ultraviolet light has a shorter wavelength. o Primary properties of visual light are intensity, frequency, propagation direction and wavelength spectrum. Light waves are called transverse waves and sound waves are called longitudinal waves
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