physics_135_fall_2019_exam_1_form_1.pdf - Place your barcode label here Physics 135 Fall 2019 Exam 1 Form#1 You must enter your form(key number on your

physics_135_fall_2019_exam_1_form_1.pdf - Place your...

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Physics 135 Fall 2019: Exam 1 Form #1 You must enter your form (key) number on your scantron to receive your score Printed Name: _________________________________________ UM ID: _______________________________________________ Signature: _____________________________________________ Instructions: Fill in your name, student ID number, form (key) number, and section number on the accompanying scantron sheet. Please double-check your UMID number is bubbled correctly (especially 1’s and 0’s). Please ensure all wanted marks are dark, and clearly erase any unwanted marks. This is a 110 minute exam, and the exam is closed book. There are 20 multiple choice questions. All questions are of equal value. You may use a calculator and one 3”x5” sheet of notes. You must mark the correct answer on the scantron sheet to get credit for the problem. No partial credit will be awarded. There is no penalty for guessing, so be sure to enter an answer for every question. You must turn in your scantron sheet and exam booklet with your barcode label. Constants: g= 9.80 [m·s2] ρwater= 1000 [kg·m3] 1 [amu] = 1.66 ×1027[kg] NA = 6.023 ×1023 [molecules·mol1] kB= 1.38 ×1023[J·K1] R= 8.314 [J K1 mol1] σ= 5.67 ×108[W·m2 ·K4] 1 [atm] = 1.013 ×105[Pa] = 760 [mm Hg] = 760 [torr] T[K] = T[°C] +273.15 1 [kg] = 1000 [g] 1 [m] = 102[cm] = 103[mm] = 106 [μm] = 109[nm] = 1012 [pm] = 1015[fm] 1 [N] = 1012[pN] = 1015[fN]Place your barcode label here
1. Galileo was the first to argue that scaling laws require larger animals to have relatively thick legs. As an animal becomes larger, its mass increases like volume, while the cross-sectional area of its bones increases like area. If you want to scale up an organism while keeping the stress in its legs the same, you have to give it relatively thicker legs. If your hippopotamus gets 2.50 times taller (and wider, and thicker) by what factor should you increase the cross-sectional area of its legs to keep the stress the same?

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