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Unformatted text preview: zakaria (mmz255) Homework 03 Yao (58180) 1 This printout should have 30 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points An ant starts at one edge of a long strip of paper that is 29 . 4 cm wide. She travels at 1 . 7 cm / s at an angle of 31 with the long edge. How long will it take her to get across? Answer in units of s. 002 10.0 points A ball is thrown and follows the parabolic path shown. Air friction is negligible. Point Q is the highest point on the path. Points P and R are the same height above the ground. Q R P Which of the following diagrams best indi cates the direction of the acceleration, if any, on the ball at point R ? 1. 2. 3. 4. The ball is in freefall and there is no acceleration at any point on its path. 5. 6. 7. 8. 9. 003 (part 1 of 2) 10.0 points A colony of troglodytes has been in a lengthy feud with its neighbors on the adjacent cliff. Colony A finally develops an important mili tary breakthrough: it rolls bombs off its cliff at known rates of speed, thus gaining pinpoint accuracy in its attacks. The acceleration of gravity is 9 . 8 m / s 2 . h x COLONY A COLONY B If the cliffs are separated by 48 m and a bomb is rolled at 7 . 4 m / s, how far down the opposite cliff will it land? Answer in units of m. 004 (part 2 of 2) 10.0 points The troglodyte war continues, and a particu larly offensive member of colony B is located 100 m below the top. At what speed must a bomb be rolled to get him? Answer in units of m / s. 005 (part 1 of 3) 10.0 points A ski jumper travels down a slope and leaves the ski track moving in the horizontal direc tion with a speed of 26 m / s as in the figure. The landing incline below her falls off with a slope of = 35 . zakaria (mmz255) Homework 03 Yao (58180) 2 The acceleration of gravity is 9 . 8 m / s 2 . d 3 5 26 m / s v f b b b b b b b b b b b b b b b b b b b b y x Calculate the distance d she travels along the incline before landing. Answer in units of m. 006 (part 2 of 3) 10.0 points Determine how long the ski jumper is air borne. Answer in units of s. 007 (part 3 of 3) 10.0 points What is the magnitude of the relative angle with which the ski jumper hits the slope? Answer in units of . 008 (part 1 of 4) 10.0 points Denote the initial speed of a cannon ball fired from a battleship as v . When the initial projectile angle is 45 with respect to the horizontal, it gives a maximum range R ....
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 Spring '08
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