PHYS_2014_Exam_1_soln

PHYS_2014_Exam_1_soln - PHYS2014/Fall 2010/Exam No. 1 OSU...

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PHYS2014/Fall 2010/Exam No. 1 Name:___________________________ OSU Physics Dept./Benton Recitation TA and Time:_________________ 1 Physics 2014: General Physics I Solutions to Exam No. 1 21 September 2010 1. For many years the “fastest man on Earth” was Col. John Stapp of the U.S. Air Force. In December 1954, he set the record by riding a rocket propelled sled down a track at 621 mph (278 m/s). The sled was then brought to a complete stop in a mere 1.4 s!!! a) Determine the average negative acceleration by Col. Stapp during that time. b) Determine how far the sled traveled during that time. (see http://www.ejectionsite.com/stapp.htm for Col. Stapp’s fascinating story.) Solution: a) Use kinematic equation 1: 0 0 0 2 0 0 m 278 s 198 20.2 1.4s f f v v at v v at v a t m a g s = + = = + = − = − = − = − b) Using kinematic equation 2: ( ) 0 0 0 0 1 2 0 and 0 1 1 m 278 1.4s 195m 2 2 s f f s s v v t v s s v t = + + = = = = = Alternatively, using kinematic equation 3:
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PHYS2014/Fall 2010/Exam No. 1 Name:___________________________ OSU Physics Dept./Benton Recitation TA and Time:_________________ 2 ( ) ( ) 2 0 0 0 2 0 2 2 1 2 0 1 2 m 1 m 278 1.4s 198 1.4s 195m s 2 s s s v t at s s v t at s = + + = = + = + = Alternatively, using kinematic equation 4: ( ) ( ) ( ) 2 2 0 0 0 2 0 2 2 0 2 2 0 and 0 2 m 278 s 195m 2 m 2 198 s f f v v a s s v s v as v s a = + = = = = − = − =
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PHYS2014/Fall 2010/Exam No. 1 Name:___________________________ OSU Physics Dept./Benton Recitation TA and Time:_________________ 3 2. A friend of yours majoring in zoology is studying the movement of caribou in northern Canada. The animals are fitted with radio transmitters that allow her to track their movements over the tundra. She asks you to help her determine net movement (direction and distance) of the caribou on a particular day. During that day, the caribou first traveled a distance of 4.0 km in a
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PHYS_2014_Exam_1_soln - PHYS2014/Fall 2010/Exam No. 1 OSU...

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