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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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 Fall '08
 Turner
 Physics, Acceleration, Work, Velocity, m/s, vy

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