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Unformatted text preview: Version 001 Discussion 2 Erskine (58200) 1 This print-out should have 5 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points The diagram describes the acceleration vs time behavior for a car moving in the x- direction. b b a P Q t At the point Q , the car is moving 1. with a constant speed. 2. with an increasing speed. correct 3. with a decreasing speed. Explanation: a = d v dt . As long as the acceleration is positive the velocity is always increasing. 002 10.0 points At a certain instant a hawk is coasting at con- stant velocity vectorv h with respect to the ground, when it sees below it a pigeon traveling at vectorv p with respect to the hawk. At that instant, what is the velocity of the pigeon as seen by someone on the ground below? 1. vectorv h + vectorv p correct 2. vectorv p vectorv h 3. vectorv h + vectorv p 2 4. vectorv h vectorv p Explanation: The velocity of the pigeon WRT the ground is the sum of the velocity of the pigeon WRT...
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This note was uploaded on 04/13/2010 for the course PHY phy303k taught by Professor Erskine during the Spring '09 term at University of Texas-Tyler.
- Spring '09