chp2 problem7

# Physics: Principles with Applications

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Chapter 2, Problem 7 Question Problem The average velocity , the time interval , and the displacement are connected by the equation . Re-arrange. (a) Let be the distance covered before rain started, and let be the velocity. Find the time taken to cover this distance. Substitute 130 km for and for . Now, we have to find the time interval for the journey during the rainfall. Express 20 minutes in hours. Therefore, 3 hours and 20 minutes is equivalent to 3.33 hours. Since the total time taken for the journey is 3.33 hours, the time interval for the journey during the rain can be calculated by subtracting the time taken to cover the 130 km from the total time. Find . Let represent the distance covered during the rain. The distance between the school and

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Unformatted text preview: hometown is the sum of the distances covered before the rainfall and during the rainfall. Find . Find using the equation where is the average velocity during the rainfall, and is the time interval. Rewrite the equation for . Substitute 130 km for , for , and 1.96 h for . Find . (1 of 2) [1/31/2008 11:34:15 AM] Thus, the hometown is far from the school. (b) Consider the equation for the average velocity. Substitute 257.4 km for and 3.33 h for . Find . The magnitude of the average velocity and the average speed are equal. Thus, the average speed is . (2 of 2) [1/31/2008 11:34:15 AM] ...
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