Tags

    Mod 5 notes: Energy, work, temperature

    mod5 (see also frog 17.1)

    energy->Joules (work~amount of water)

    power->Watts (how fast the work is done~flow)

    EMR: shorter wavelengths more energy e.g. UV, X-rays

    KE/PE

    PE: chemical bonds, height, spring

    KE: motion, freewheel, flowing air/water

    temp: KE=1/2mv^2 (macro level)

    molecular level:

    KE=3/2kT, so T prop to v^2 of molecules

    thermodynamics: 3 laws (physics version)

    1. you can’t win (no eff. >100%)
    2. you can’t break even (no eff. = 100%)
    3. you can’t get out of the game (S >0 univ)

    Chemical version:

    1. energy cannot be created or destroyed
    2. energy can move, but always at a cost (entropy, disorder increases, S>0 universe)

    efficiency; never 100%, 30-60% common

    Human 35% eff, diesel engine 60%

    energy quality-entropy, disorder, e.g. closet S>0, takes energy input to reduce S (entropy)

    open/closed systems: energy, mass

    steady state: balance

    positive/negative feedback: stable, instable c.g. of ships


    n.b.

    solar panels: 100 kW = 100kJ per second

    wind turbine 2.4 kW = 2.4 kJ per second

    stairs: how fast could you run up? Mass?

    hot water heater: 4.5 kW for 1 hour = 4.5 kWh

    4°C water density greatest: ponds don’t freeze solid in winter

    Comments

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You should be able to do the following after logging in with your account: To create a new page, click the ...Falseadmin2020-08-19T15:43:59+00:00adminadmin2013-02-05 02:24:03+00:002013-02-05 02:24:03updated4Added tag - hotadminadmin2013-02-05 02:24:02+00:002013-02-05 02:24:02addTag3adminadmin2013-02-05 02:05:35+00:002013-02-05 02:05:35updated2First createdadminadmin2013-02-05 02:03:35+00:002013-02-05 02:03:35created1wiki2013-02-05T02:24:03+00:00groups/apenvironmentalscience/wiki/394a8FalseEnergy notes/groups/apenvironmentalscience/wiki/394a8/Energy_notes.htmladmin4 updatesEnergy notes Week of 2.4.13: energy wrap-up e2 video: coal vs. nuclear in class AP exams: FRQ 2002.1 2004.2 2006.1 2007.2 2008.1 ...Falseadmin2013-02-05T02:24:03+00:00adminadmin2013-02-05 02:23:20+00:002013-02-05 02:23:20updated6Added tag - hotadminadmin2013-02-05 02:23:18+00:002013-02-05 02:23:18addTag5adminadmin2013-02-05 02:23:12+00:002013-02-05 02:23:12updated4adminadmin2013-02-05 02:21:48+00:002013-02-05 02:21:48updated3adminadmin2013-02-05 02:20:26+00:002013-02-05 02:20:26updated2First createdadminadmin2013-02-05 02:06:00+00:002013-02-05 02:06:00created1wiki2013-02-05T02:23:20+00:00groups/apenvironmentalscience/wiki/c360bFalseFeb-May plan/groups/apenvironmentalscience/wiki/c360b/FebMay_plan.htmladmin6 updatesFeb-May plan 1. conclusion of energy chapters (see previous wiki) 2. 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