NYU Poly cbe1002 hw 1

# NYU Poly cbe1002 hw 1 - A ngelo Campanella Professor...

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Angelo Campanella Professor Mijovic Introduction to CBE 1002 February 9, 2011 Chapter 2: Introduction to Engineering Calculations 5) A frustrated professor once claimed that if all the reports she had graded in her career were stacked on top of one another, they would reach from the Earth to the moon. Assume that an average report is the thickness of about 10 sheets of printer paper and use a single dimensional equation to estimate the number of reports the professor would have had to grade for her claim to be valid. 1 sheet of paper is .1mm thick, so 10 sheets of paper is 1 mm thick. The distance from the Earth to the moon is 384,403 km, which is 384,403,000,000 mm. You would need to stack 3,844,030,000,000 sheets of paper to reach from the Earth to the moon. 8) Calculate: a. The weight in lbf of a 25.0-lbm object. ?lbf = 25.0lbm * 32.174ft/s^2 ?lbf = 804lbf b. The mass in kg of an object that weighs 25 newtons. 25N = ?kg(9.8066m/s^2) 25N/9.8066m/s^2 = 2.6kg c. The weight in dynes of a 10- ton object (not metric tons). 1 ton = 907.2kg 10 tons = 9,072kg = 9,072,000g 9.8066m/s^2 = 980.66cm/s^2

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9,072,000g*980.66cm/s^2 = 8,896,500,000g*cm/s^2 17) The following expression has occurred in a problem solution: R = ((0.6700)(264,980)(6)(5.386x10^4))/((3.14159)(0.479x10^7)) The factor 6 is a pure integer. Estimate the value of R without using a calculator, following the procedure outlined in Section 2.5b. Then calculate R, expressing your answer in both scientific and decimal notation and making sure it has the correct number of significant
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## This note was uploaded on 03/03/2011 for the course CBE 1002 taught by Professor Mijovic during the Spring '11 term at NYU Poly.

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NYU Poly cbe1002 hw 1 - A ngelo Campanella Professor...

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