CHEM-C 117 Lecture 1: C117 Ch. 6 Notes (Jan. 13)
Document Summary
Defining energy: energy- capacity to do work/produce heat, kinetic energy- in any moving object; due to motion. Periodic nanoscale- acoustic energy: potential energy- due to position or composition; stored in an object. Stretched rubber band, water stored in dam, drawn bow, chemical bond energy. Created by work done against a force. Gravitational potential energy: (cid:1842)(cid:1831)=(cid:1865)(cid:1859) where (cid:1859)= acceleration of gravity. Can be calculated using different types of forces. A 5. 0 lb (2. 3 kg) bag of sugar is thrown at 10. 0 m/s (22. 4 mph). Calculate the kinetic energy of because (cid:1837)(cid:1831)=(cid:2869)(cid:2870)(cid:1865)(cid:1874)(cid:2870)or (cid:1842)(cid:1831) = (cid:1832)(cid:1856) Units of energy the bag: standard units- joules =(cid:3038)(cid:3034) (cid:3040)(cid:3118) (cid:3046)(cid:3118) = (cid:883). (cid:884) (cid:883)(cid:882)(cid:2870) (cid:1836)=(cid:882). (cid:883)(cid:884) (cid:1863)(cid:1836: calorie- energy needed to heat 1g of water by 1 . On food- use kilocalories (big c: kilowatt-hour- if energy is used at 1 j/s, it is a watt (power)
