calc12

calc12 - tom.h.wilson tom.wilson@mail.wvu.edu Dept. Geology...

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1 tom.h.wilson tom.wilson@mail.wvu.edu Tom Wilson, Department of Geology and Geography Dept. Geology and Geography West Virginia University 3 20 zkW Q km Where z is the distance in km from the base of the Earth’s crust and Q is heat per unit volume i. Determine the heat generation rate at 0, 10, 20, d 30 k f th b s f th st 3 0 0 20 kW kW km km 33 10 0.5 20 kW kW km km and 30 km from the base of the crust ii. What is the heat generated in a small box-shaped volume z thick and 1km x Tom Wilson, Department of Geology and Geography VA z  3 Vz k m  1km surface? Since 3 QV Qz km
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2 Units Energy is often expressed in joules, where 1 joule is 1Nt-m (newton meter). One joule/sec is a unit of power (the rate at which energy is expended/supplied). One joule/sec is a watt. Tom Wilson, Department of Geology and Geography http://www. onlineconversion.com/ There you will find that one kilowatt corresponds to 1.34 horsepower. So your hundred watt light bulb gives off the heat of a little more than 1/10 th of the horsepower Tom Wilson, Department of Geology and Geography of the horsepower.
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calc12 - tom.h.wilson tom.wilson@mail.wvu.edu Dept. Geology...

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