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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 θ = 35 ◦ . zakaria (mmz255) – Homework 03 – Yao – (58180) 2 The acceleration of gravity is 9 . 8 m / s 2 . d 3 5 ◦ φ 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 φ 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
 NIU
 Acceleration, Work, Velocity

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