Midterm Exam 1•Wednesday, February 23, 18:30 – 19:30•Place: PHY 333•Chapters 1 - 4•The exam is closed book.•The exam is a multiple-choice test.•There will be ~15 multiple-choice problems.–maximum possible score will be 150 points.•Note that total possible score for the course is 1,000 points (see the course syllabus)•The difficulty level is about the same as the level of textbook problems.•You may make a single crib sheet–you may write on both sides of an 8.5” ×11.0” sheetLecture 112Purdue University, Physics 149
Lecture 12Purdue University, Physics 1493You and a friend are standing on level ground, each holding identical baseballs. At exactly the same time, and from the same height, you drop your baseball without throwing it while your friend throws her baseball horizontally as hard as she can. Which ball hits the ground first?A) Your ballB) Your friends ballC) They both hit the ground at the same timeILQ 1When ball hits depends on y only!y(t) = y0+ vyo+ ½ aytSame for both balls!v0y= 0 and y = 0therefore t=sqrt(2y0/g)result is independent of v0x
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Lecture 12Purdue University, Physics 1494ILQ 2 Fred throws a ball 30 mph vertically upward and then catches it again at the same height he threw it from. What is the speed of the ball when he catches it? (Neglect air resistance)A) v < 30 mph B) v = 30 mph C) v > 30 mphvy2= vy02- 2g(y-y0)vy2= vy02