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111 examSolutions 1997

111 examSolutions 1997 - Old Dominion University Fall 1997...

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Unformatted text preview: Old Dominion University Fall 1997 Physics 111N Introductory General Physics Professor C. Sukenik EXAM 1 Sept. 18, 1997 11:00 am - 12:15 pm Name: Honor Code Signature: SSN: Instructions: 0 Read each question carefully. 0 Clearly mark your answers. 0 Problems are weighted as indicated by the points in parentheses. 0 Use the back of pages for extra space if needed. 0 You may use a calculator. DO NOT share calculators. 0 You may use both sides of 1 sheet of 8 1/2” x 11” paper which contains your formulas and notes. Your formula sheet may NOT contain worked problems. Put your name on your formula sheet and attach to your exam when done. 0 You will have 75 minutes to work on the exam. SH 0 WALL WORK for partial credit. Score (Do not fill in this part, please) Exam Version C Part 1-1 Part 1—2 Part 1-3 Part 1—4 Part 2—1 Part 2—2 Part 2—3 Total Score Part 1 (20 points total) (5 points) 1. In an attempt to flee the physics building following this exam, you aimlessly walk 3 blocks northeast, turn and walk 3 blocks northwest, turn and walk 3 blocks southwest, and finally turn and walk 3 blocks southeast. Use the graphical technique of vector addition to determine your final displacement. (5 points) 2. You decide that you want to cover the entire chalkboard in this lecture hall with one dollar bills laid down one next to each other. Estimate how much money you need to do this. “Mpuarunwwl we , (5 points) 3. Later in the semester, you will learn that the period of a simple pendulum, T , is given by the expression: m T = 2 -— ”\l k where the units of T are seconds (3) and the units of the mass m are kilograms (kg). Use dimensional analysis to determine the units of k . (5 points) 4. Given that light travels with a speed of 3 x 1010 cm/ s , how many kilometers will a pulse of light travel in 2 hours ? 77%. Wm Part 2 Problem 1 (20 points total) You get on a subway train stopped at the station. The train begins moving with a uniform acceleration of 1.2 m / sz. At exactly half the distance to the next station, the train begins braking with an acceleration of -1.2 m / 52 . The two stations are 1100 m apart. (10 points) b) What is the maximum speed that the train reaches before braking? Part 2 Problem 2 (30 points total) A rocket on earth is launched from rest vertically into the air. For 1 minute the engines provide a constant acceleration of 2 m / 52 , then the engines cutoff. How long is it from the time of takeoff until the rocket hits the ground? Proceed as follows: (10 points) a) Calculate the height of the rocket after 1 minute. Z (10 points) 0) Use the infonnation from (a) and (b) to find how long it takes for the rocket to free fall back to the ground after the engines cutofi‘. Add this time to the time from takeoff to engine cutoff. ”“2;ng waWMWWle-swam ‘ H» I» ' Part 2 Problem 3 (30 points total) You are on an airplane dropping emergency medical supplies to a group of stranded oceanographers. As indicated in the figure, your airplane is traveling with a constant horizontal velocity of 70 m/ s at a height of 0.5 km . (The course of your airplane is such that you will fly directly over the stranded oceanographers.) In order to drop the supplies as close to the oceanographers as possible, what must your line of sight angle, 6 , be when you release the supplies? (The angle 9 is shown in the figure.) Hint: Start by determining how long it takes for the supplies to hit the water alter being released from the airplane. ‘ \‘9 gswgmmem:msw pr ...
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