MTH 252H Quiz: MTH252 Quiz 6 2015
11 Oct 2018
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Justi cation includes mathematical work as well as verbal explanations. For multiple choice questions you get 1pt for the correct answer and up to 4pts for the explanation. (5pts) problem 1: A 20m chain with a mass-density of 3kg/m is coiled on the ground. You must explicitly state what your variable measures and include units to get full credit. Solution: rubric: 2pts for stating what the variable measures/including units, 2pts for correct setup, 1pt for mathematical work. I will let y measure the distance, along the chain, from the top of the chain. Note that if you choose a di erent orientation your setup will likely look di erent (though it should give the same answer! Then for a small section of chain, the work done in lifting just that segment will be approximately. Wi (3 y)g(5 yi) where 3 y gives the mass of the segment, and that segment is lifted 5 yi meters.
