Review for Test 1 q Responsible for Chapters 1 2 3 and 4 except 3 6 Notes from class Problems worked in class Homework assignments q Test format 18 problems 5 points each multiple choice some T F 2 bonus probs Time 75 minutes q Test materials Pencil eraser and non programmable calculator No formulae sheet or paper all provided Closed textbook and notes Student ID Rules for the Test q One and only one empty seat between each student q No talking during test except to proctors or instructor q Put name and 810 number on scantron q Bring Student ID q All electronics turned off phones tablets computers etc except simple calculator q Proctors are watching Material Covered q Chapter 1 Introduction Units significant figures dimensions Order of magnitude estimates q Chapters 2 and 4 1D and 2D Kinematics Displacement velocity and speed acceleration Equations of kinematics solve problems Horizontal and free fall 1D motion Projectile motion 2D q Chapter 3 Scalars and Vectors Components of a vector unit vectors Vector addition subtraction Resultant vector magnitude and direction Example Problem intermediate A ball is thrown straight upward and rises to a maximum height of 16 m above its launch point At which height above its launch point has the speed of the ball decreased to one half of its initial value Solution y Given ymax 16 m ymax vy max Infer vy max 0 yi 0 yA vyA Find yA when vyA vyi 2 Also need vyi yi vyi To maximum height drop y subscript in v v2max v2i 2g ymax yi Solve for vi v2i v2max 2g ymax yi 2gymax To intermediate point v2A v2i 2g yA yi Solve for yA yA v2i v2A 2g v2i vi 2 2 2g vi2 1 1 4 2g vi2 3 4 2g 3vi2 8g 3 2gymax 8g 3ymax 4 3 16m 4 12 m Example Problem 4 43 Hard On a hot summer day a young girl swings on a rope above a local swimming hole When she lets go of the rope her initial velocity is 2 25 m s at an angle of 35 0o above the horizontal If she is in flight for 0 616 s how high above the water was she when she let go of the rope
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