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Unformatted text preview: Abd Elhai, Mohamed – Homework 4 – Due: Feb 18 2008, 11:00 pm – Inst: Dr Kevin Dean 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. This is ONLINE HOMEWORK No 4 It is due 09:00 Tuesday morning, 19 Febru- ary (Abu Dhabi time) - (same as 23:00 Mon- day night in Texas). 001 (part 1 of 3) 5 points You are driving a car down a straight road at a constant 51 miles per hour. Consider the following forces: I) air drag pushing back on the car; II) gravity pulling down on the car; III) the ground pushing up on the car; IV) friction pushing the wheels (and the car) forward; and V) friction pushing the wheels (and the car) back. Which force(s) act on the car? 1. I, II, III and IV 2. II, III and IV 3. I and II 4. I, III and V 5. I, II and III 002 (part 2 of 3) 5 points Is there a net or unbalanced force acting on the car? 1. No; the speed is constant. 2. Yes; a net force in the horizontal direc- tion. 3. Cannot be determined 4. No; the velocity is constant. 5. Yes; a net force in the vertical direction. 003 (part 3 of 3) 5 points After a while, the car started to go around a long bend, still maintaining its constant speed of 55 miles per hour. Is there a net (unbalanced) force acting on the car? 1. No; the velocity of the car does not change. 2. Cannot be determined 3. Yes; its direction is not the same as the velocity....
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