<P>1. If a projectile is fired from the origin of the coordinate system with an initial vleocity V0 and in a directin making an angle A with the horizontal, calculate the time required for the projectiole to cross a line passing through the origin and making an angle B < A with the horizontal</P>
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<P>2. A clown is juggling four ball simultaneously. Students use a video tape to determine that it takes the lown 0.9s to cycle each ball through his hands ( including catching, transfeering, and throwing) and to be ready to catch the next ball. What is the minimum vertical speed the clown must throw up each ball?</P>
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<P>3. A jet fighter pilot know he is able to withstand an acceleration of 9g before blacking out.</P>
<P>The pilot points his plane vertically down while traveling at Mach 3 speed and intends to pull up in a circular maneuver before crashing in to the ground (a) Where does to maximum acceleration occur in the maneuver ?</P>
<P>(b) What is the minimum circle the pilot can take?</P>
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<P>도움 요청합니다 ㅠㅠ
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첫댓글 허걱.! 1번은..ㅡ.ㅡ 얼마전에 했던거랑 비슷하다..
3번도..ㅡ.ㅡ 어디선가 본 듯 한데.. 물리바다에 올라왔던 문제인가;;
2번은 0.9초동안 두번 최고높이에 도달해야 하고 제자리로 와야되니깐.. 0.225초에 최고 높이에 한번 이르르고 0.675초에 또 한번.. 2.205m/s인가..
이거 marion에 나오는 문제네요 ^^