PHY183-Lecture07 - Exam 1 Exam 1 will take place in class...

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1 January 19, 2012 Physics for Scientists&Engineers 1 1 Physics for Scientists & Engineers 1 Spring Semester 2012 Lecture 7 Exam 1 Exam 1 will take place in class Monday You need to bring 5 inch by 8 inch card of notes (you can use both sides) A calculator A #2 pencil Pick up an answer sheet at the front of the classroom and sit in your assigned row according to the seating chart Your exam will be handed out by row and will have your name and picture on the cover. Sit in the seats on the east end of the classroom first Do not open the exam until told to do so You must attend your registered section January 19, 2012 2 Section 2 Seating Chart January 19, 2012 3 LAST NAME SIT IN ROW Ajayi -- Bryant C Burkholder -- Degroot D Deline --Gardner E Garrett -- Iden F Ijeomah -- Liang G Liu -- Meinecke H Mena-Lapaix -- Ni I Nichols -- Pomaville J Poteracki -- Schreiner K Schultz -- Tao L Taylor -- Wladorf M Wandyez -- Yang N Ye -- Zilli O Clicker Quiz An example of one dimensional motion with constant acceleration is A. NASCAR racing B. The Earth orbiting the Sun C. Free fall D. None of the above January 19, 2012 4 Throw a Ball in the Air Let’s imagine that we throw a ball straight up into the air Once we let go of the ball, the only force acting on the ball is the force of gravity Free fall January 19, 2012 5 Example: Ball in the Air A ball is thrown upward with a speed v 1 . The ball reaches a maximum height of y = h . What is the ratio of the speed of the ball, 2 , at y = h/2 to the initial upward speed of the ball, 1 , at = 0? January 19, 2012 6 2 1 2 1 02 2 vg h h =− = () 22 21 2/ 2 2 vv g h g hg h = 2 2 2 1 2 1 1 1 0.71 2 h h v v ==
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2 January 19, 2012 Physics for Scientists&Engineers 1 7 Clicker Quiz If you throw a ball straight up into the air, this is a particular example of free-fall motion. At the instant that the ball reaches its maximum height, which of the following statements it true? A. The ball’s acceleration points down and its velocity points up B. The ball’s acceleration is zero and its velocity points up C. The ball’s acceleration points up and its velocity points up D. The ball’s acceleration points down and its velocity is zero E. The ball’s acceleration points up and its velocity is zero January 19, 2012 8 Reaction Time We can measure the human reaction time with a simple free-fall experiment One person lets ruler go, the other
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PHY183-Lecture07 - Exam 1 Exam 1 will take place in class...

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