File Edit View History Bookmarks Tools Help MasteringPhysics Ch 23 Hw X G Part A

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File Edit View History Bookmarks Tools Help MasteringPhysics Ch 23 Hw X G Part A Your raised arm bri... x 2 ne of the contests at the x c chegg studyIGuided sol... x c Physics For scientists And x S M g Physics HW 9 C. x SI Mastering Physics HW 9 C. x https:// gphys /myct/i ProblemID D-59145346 Search Help l Close Physics for Scientists II Ch 23 HW Problem 23.52 Resources previous 11 of 14 next Problem 23.52 Part A One of the contests at the school carnival is to Your raised arm brings the spear point to the level of your eyes as you throw it, and over this throw a spear at an underwater target lying flat on short distance you can assume that the spear travels in a straight line rather than a the bottom of a pool. The water is 0.800 m deep parabolic trajectory You're standing on a small stool that places your Express your answer with the appropriate units eyes 3.00 m above the bottom of the pool. As you look at the target, your gaze is 30° below horizontal. At what angle below horizontal should you throw the spear in order to hit the target? Value Units Submit My Answers Give U Provide Feedback Continue 7:03 PM Ask me anything 4/19/2016

Explanation / Answer

For refraction,
sin i / sin r = 3.8/3
=> sin r = (3/3.8) sin(60°) = 33/8
=> tan r = tan [arcsin (33/8)]
=> tan r = 0.93689

2cot (60°) = 1.1547


Total =1.1547+0.93689
Total = 2.09159

=> required angle,
= arctan (3/2.09519) = 55.11 degrees

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