HW2 Solution

# HW2 Solution - Kim Jin Homework 2 Due 11:00 pm Inst Stacy...

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Kim, Jin – Homework 2 – Due: Sep 11 2007, 11:00 pm – Inst: Stacy Sparks 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. The due time is Central time. NOTE that this assignment is due on a Tuesday, as most assignments will be. How- ever, you should always check the due date and time at the top oF each assignment. While I try to keep these on a regular schedule, circumstances (holidays, upcoming exams) sometimes necessitate shiFting the due day oF an assignment. 001 (part 1 oF 1) 2 points IF you had 40 molecules oF CO gas in 250000 molecules oF air, what is the concentration oF CO in parts per million? 1. 80 ppm 2. 160 ppm correct 3. 40 ppm 4. 120 ppm Explanation: 002 (part 1 oF 1) 2 points 7 ppm is equivalent to 1. 7%. 2. 7,000,000%. 3. 7,000 ppb. correct 4. 7,000,000 ppm. 5. 7 ppb. Explanation: 003 (part 1 oF 1) 2 points The measurement 3 . 2 × 10 - 3 g could also be written as 1. 3.2 g. 2. None oF these 3. 3.2 pg. 4. 3.2 kg. 5. 3.2 mg. correct Explanation: mg reFers to 10 - 3 . 004 (part 1 oF 1) 2 points How many liters is 50 milliliters? 1. 50 L 2. 0.050 L correct 3. 0.50 L 4. 500 L 5. 5.0 L Explanation: ? L = 50 mL × 1 L 1000 mL = 0 . 050 L 005 (part 1 oF 1) 2 points A piece oF metal has a volume oF 0.250 hogsheads and a mass oF 54.424 kg. Calculate the density oF the metal in penny- weights per peck. 1 pennyweight (pw) = 1.55 grams 1 hogshead (hh) = 238.5 liters 1 peck = 9.091 liters 1. 1 . 90 × 10 - 4 pw/peck 2. 6.57 pw/peck 3. 5 . 35 × 10 3 pw/peck correct 4. 3 . 45 × 10 3 pw/peck 5. 157.22 pw/peck Explanation:

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## This note was uploaded on 04/12/2010 for the course PHY 58195 taught by Professor Turner during the Spring '09 term at University of Texas.

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HW2 Solution - Kim Jin Homework 2 Due 11:00 pm Inst Stacy...

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