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Unformatted text preview: homework 04 RAHMAN, TARIQUE Due: Feb 6 2008, 3:00 am 1 Question 1, chap 4, sect 1. part 1 of 1 10 points Suppose that three balls are rolled simulta- neously from the top of a hill along the slopes as shown below. 1 2 3 Which one reaches the bottom first? 1. 1 correct 2. 1 and 2 3. The balls reach the bottom at the same time. 4. 2 and 3 5. 3 6. 2 7. 1 and 3 Explanation: The one on the left. That ball gains speed quickly at the begin- ning, where the slope is steeper, so its average speed is greater even though it has less accel- eration in the last part of its trip. Question 2, chap 4, sect 2. part 1 of 1 10 points Consider the instantaneous velocity of a body. This velocity is always in the direction of 1. the motion at that instant. correct 2. the net force at that instant. 3. the least resistance at that instant. Explanation: Solution: The instantaneous velocity vector will always point in the direction of the motion at that instant. Question 3, chap 4, sect 3. part 1 of 1 10 points At a particular instant, a stationary ob- server on the ground sees a package falling with speed v 1 at an angle to the vertical. To a pilot flying horizontally at constant speed rel- ative to the ground, the package appears to be falling vertically with a speed v 2 at that instant. What is the speed of the pilot relative to the ground? 1. v 1 v 2 2. v 2 v 1 3. radicalBig v 2 1 v 2 2 correct 4. v 1 + v 2 5. radicalBig v 2 1 + v 2 2 Explanation: The stationary observer sees the resultant velocity of the horizontal and vertical compo- nents. The pilot sees the vertical component....
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