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Quiz 1 - Solution-2011

# Quiz 1 - Solution-2011 - ChE 2033 Chemical Engineering...

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ChE 2033 Chemical Engineering Fundamentals Fall 2011 Quiz 1, Friday September 2, 2011 Closed Notes/Closed Book NAME:_____________________________________________ 1 1. I bought a pack of plain white paper that contains 500 sheets of paper, each 8.5 in. x 11 in. On the package it says the paper is 75 grams/m 2 . A) (5 pts) What is the mass (in grams) of each sheet? B) (5 pts) How much does the pack weigh in lb f ? Solution: Part A) convert area of 1 sheet of paper from in 2 to m 2 (3 pts) Area = 8.5 in ( ) 11 in ( ) = 93.5 in 2 ( ) 0.0254 m in 2 = 0.0603 m 2 Obtain mass of each sheet in g: (2 pts) mass = 0.0603 m 2 ( ) 75 g m 2 = 4.52 g Calculate weight for 500 sheets in lb f . (take off 2 pts if they have lbm instead of lbf) Weight = m * g g c = 500 sheets ( ) 4.52 g sheet 1lb m 453 g 32.174 ft s 2 32.174 lb m ft s 2 lb f = 4.99 lb f 2. (10 pts) Find the units for C in the following equation The terms in the equations have the following units: A (ft/s), B (ft/ft), R (ft), D(ft 2 /s 3 ), E (ft 2 /s) A = B 1/2 *C*R 2/3 Solution: C = A B 1/ 2 * R 2/ 3 = ft / s ( ) ft / ft ( ) 1/ 2 * ft ( ) 2/ 3 = ft 1/ 3 s Grading Rubric: - 7 pts for showing work

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