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# quiz6 - Physics 213/223 Evaluated Review 4:30 PM Dec 9 2011...

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All questions to be answered on your Scantron card (100 points total). 10 5 0 5 10 15 01234 The f rst four questions refer to the graph above showing the velocity vs. time for a light, large surface area object launched straight up in the air from the edge of the roof of a building in such a way that it can fall all the way to the ground. . The vertical scale gives the velocity in m/s and the horizontal scale the time in s. A time interval of 0.05 s separates each symbol. 1. (2.5 points) At what time does the object reach its highest point? (a) t =0 . 1 s. (b) t . 2 s. (c) t . 5 s. (d) t =1 . 0 s. (e) t =2 . 0 s. 2. (2.5 points) Which statement best describes the acceleration? (a) a> 0 for all times. (b) a< 0 for all times. (c) a 6 for all times. (d) 0 for somes times and a for some times. (e) 0 for somes times and a for some times. 2
3. (2.5 points) At which time does the object reach terminal velocity? (a) t =0 . 0 s. (b) t . 4 s. (c) t . 8 s. (d) t =1 . 2 s. (e) t . 6 s. 4. (2.5 points) About how high does the object go relative to its launch point? (a) h m. (b) h =2 m. (c) h =5 m. (d) h =10 m. (e) h =20 m. 5. (2.5 points) Suppose a star of mass M and radius R has a gravitation acceleration g on its surface. If the star cobtracts to a radius R/ 10 while maintaining its mass, the gravitational acceleration on the surface becomes? (a) 0 . 01 g . (b) 0 . 1 g . (c) g . (d) 10 g . (e) 100 g . 6. (2.5 points) The planet Venus’s period of revolution about the sun is 0.6 earth year. How far away from the sun is Saturn, in mutiples of the earth-to-sun distance (astronomical units or a.u.)? (a) 0 . 18 a.u. (b) 0 . 36 a.u. (c) 0 . 54 a.u. (d) 0 . 72 a.u. (e) 0 . 90 a.u. 7. (2.5 points) A major league baseball hitter playing for the Kansas City Royals can take a 45 m/s fastball (mass= 0 . 145 kg) and hit it back at the pitcher at a speed of 55 m/s. The ball remains in contact with the bat for about 1 . 45 × 10 3 s during the process of hitting the ball.

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quiz6 - Physics 213/223 Evaluated Review 4:30 PM Dec 9 2011...

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