HW-CH2 - HW-CH2 9th edition CH2 Problems: 14, 17, 56, 101...

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Unformatted text preview: HW-CH2 9th edition CH2 Problems: 14, 17, 56, 101 8th edition CH2 Problems: 16, 17, 54, 112 14. An electron moving along the x axis has a position given by x = 16te t m, where t is in seconds. How far is the electron from the origin when it momentarily stops? 17. The position of a particle moving along the x axis is given in centimeters by x = 9:75 + 1:50t3 , where t is in seconds. Calculate (a) the average velocity during the time interval t = 2:00s to t = 3:00s; (b) the instantaneous velocity at t = 2:00s; (c) the instantaneous velocity at t = 3:00s; (d) the instantaneous velocity at t = 2:50s; and (e) the instantaneous velocity when the particle is midway between its positions at t = 2:00s and t = 3:00s. (f) Graph x versus t and indicate your answers graphically. 56. Figure 2-33 shows the speed v versus height y of a ball tossed directly upward, along a y axis. Distance d is 0:40m. The speed at height yA is vA . The speed at height yB is 1 vA . What is speed vA ? 3 101. A ball is thrown down vertically with an initial speed of v0 from a height of h. (a) What is its speed just before it strikes the ground? (b) How long does the ball take to reach the ground? What would be the answers to (c) part a and (d) part b if the ball were thrown upward from the same height and with the same initial speed? Before solving any equations, decide whether the answers to (c) and (d) should be greater than, less than, or the same as in (a) and (b). 1 ...
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This note was uploaded on 05/14/2011 for the course ECON 101 taught by Professor Asdaf during the Spring '11 term at Universidad de San Buenaventura Bogota.

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