quiz3 - Physics 213, Quiz 3 4:30 PM, Oct. 14, 2011 T....

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Physics 213, Quiz 3 4:30 PM, Oct. 14, 2011 T. Bolton Name Instructions. Print and sign your name on this quiz and on your scantron card. In doing so, you are acknowledging the KSU Honor Code: “On my honor as a student I have neither given nor received unauthorized aid on this assignment.” For two quick points, circle your studio instructor: Nemzer(TU 7:30) Bolton(TU 9:30) Nemzer(TU 11:30) Le(TU 1:30) Laurent(TU 3:30) Pavlov(WF 7:30) Pavlov(WF 9:30) Von Kor f (WF 11:30) Work alone and answer all questions. Part I questions must be answered on the Scantron cards. Putyournameonyourcard . Co lorinthecorrectboxcomp lete lyforeveryanswerw ithapenc i l . If you make a mistake, erase thoroughly. Don’t forget to color in the boxes for your WID. If we have to correct this by hand we may take o f f ve points from your score! Part II must be answered in the space provided on the test. The last page is a detachable equation sheet. You may use a calculator. You may ask the proctors questions of clari
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Part I: Multiple choice questions to be answered on your Scantron card (42 points total). 1. (3 points) A major league baseball hitter playing for the Kansas City Royals can take a 45 m/s fastball (mass= 0 . 145 kg) and hit it back at the pitcher at a speed of 55 m/s. The ball remains in contact with the bat for about 2 × 10 3 s during the process of hitting the ball. What is the force of the bat on the ball. (a) 725 N. (b) 7250 N. (c) 72500 N. (d) 725000 N. 2. (3 points) Cosmic rays reaching the surface of the earth consist mainly of radioactively unsta- ble particles called muons, with the average lifetime of the muon 2 . 2 × 10 6 s, as determined in its own rest frame. Muons are produced in collisions of high energy protons with oxygen and nitrogen nuclei about 10 km above earth’s surface. Given this fact, it seems impossible for muons to reach the ground before they decay; nevertheless, they do. Why? (a) Muons can travel faster than the speed of light. (b) The muon lifetime is shortened by its relative motion, as determined by an observer on earth. (c) Only stationary muons radioactively decay; moving muons are stable.
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quiz3 - Physics 213, Quiz 3 4:30 PM, Oct. 14, 2011 T....

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