prob set 03 - University of British Columbia, Okanagan...

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1 University of British Columbia, Okanagan School of Engineering APSC257 – Principles of Engineering Design Assignment No. 3 (Engineering and Modeling) Due: September 25, 2008 Some people may wonder why modeling of a real-life event is important at all. Why do engineers add extra efforts that they should maintain as the project progresses, on the modeling of a system? Many reasons have been discussed in the lecture to answer questions like this. Briefly, the reason is that there are a number of clear benefits that models provide a development organization. The goal of this exercise is to mathematically model a simple event that you face with every day. Conservation of mass, one of the most powerful tools in engineering modeling, says that the rate of change of mass within a system is equal to the rate of incoming mass ( m in ) to the system minus rate of outgoing mass ( m out ) from the system. Or: out in m m dt dm = (1) Note that the terms in (1) have the unit of kilogram per seconds in
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This note was uploaded on 03/28/2011 for the course APSC 254 taught by Professor Stephen during the Spring '11 term at The University of British Columbia.

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prob set 03 - University of British Columbia, Okanagan...

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