속력, 속도에 관한 문제..알려주세여ㅠ.ㅠ

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2004.03.23 / 1,327

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안녕하세요? 이 게시판을 통해서 많은 도움을 받고있는 학생입니다.
제가 워낙 물리를 못해서여...매 주마다 있는 물리 숙제가 정말 너무나 부담스럽습니다..^^;
정말 죄송하지만..이 문제들 좀 알려주세여~^^;;
내일까지 레포트로 내야하거든여..꼭 좀 알려주세여 부탁드립니다..ㅠ.ㅠ

1. A ball is thrown with enough speed stright up so that is in the ball air several seconds
(a) What is the velocity of the ball when it gets to its highest point?
(b) Whait is its velocity 1 s before it reaches its highest point?
(c) What is the change in its velocity during this 1-s interval?
(d) What is its velocity 1 s after it reaches its highest point?
(e) What is the change in velocity during this 1-s interval?
(f) What is the change in velocity during the 2-s interval(careful!)
(g) What is the acceleration of the ball during any of these time interals
and at the moment the ball has zero velocity?


2. The net force acting on an object and the resulting acceleration are always in the same direction. you can demonstrate this with a spool.
If the spool is pulled horizontally to the right, in which direction will it roll?




* 안시원님에 의해서 게시물 복사되었습니다 (2004-09-03 16:18)
* 안시원님에 의해서 게시물 복사되었습니다 (2004-09-03 15:49)
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