Unformatted text preview: PH211 Midterm 1 (Oct 24, 2007) Conceptual Questions (10 points each – explanations are required for full points): (Please use page 1 for the first two questions, and page 2 for the last two questions, you may write on the backs if needed) 1. For a projectile launched at some angle between zero and ninety degrees, at the highest point along its motion (h max ), state whether each of the following quantities are positive, negative, or zero: v, v x , v y , and a. Explain your reasoning for each. 2. Two stones are released from rest at a certain height, one about a second after the other. (a) Will the difference in their speeds at any specific time increase, decrease, or stay the same as they fall? (b) Will their separation distance at any specific time increase, decrease, or stay the same as they fall? 3. Consider a car at rest. Can we conclude that the downward gravitational pull of the Earth on the car and the upward contact force of the Earth on the car are equal and opposite because they are...
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This note was uploaded on 03/15/2009 for the course PH 212 taught by Professor Demaree during the Winter '08 term at Oregon State.
- Winter '08