111 examSolutions 1999

111 examSolutions - Old Dominion University Fall 1999 Physics 111N Introductory General Physics Professor C Sukenik EXAM 1 Sept 23 1999 11:00 am ~

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Unformatted text preview: Old Dominion University Fall 1999 Physics 111N Introductory General Physics Professor C. Sukenik EXAM 1 Sept. 23, 1999 11:00 am ~ 12:15 pm Name: Honor Code Signature: SSN: Instructions: 0 Read each question carefully. - Clearly mark your answers. 0 Show units for all answers. 0 Problems are weighted as indicated by the points in parentheses. - Use the back of pages for extra space if needed. 0 You may use a calculator. DO NOT share calculators. - You may use both sides of1 sheet of8 V2” x 11” paper which contains your formulas and notes. Your formula sheet may NOT contain worked problems. 0 You will have 75 minutes to work on the exam. SHO WALL WORK for partial credit. Score : Part 1—1 Part 2-1 Part 1-2 Part 2-2 Part 1—3 Part 2—3 Part 1-4 Total Score Part 1 (40 points total) (10 points) 1. If three gallons of paint are required-to cover a rectangular shaped wall with an area of 70.0 ml, how thick is the paint on the wall? One gallon has a volume in SI units of3.78 x 10‘3 m’. Answer with units: (10 points) 2. You run from this building to the chemistry building, 100 m away, in 9.62 seconds. You then turn around and run back to the physics building in 11.34 seconds. Calculate the average velocity for the roundtrip. Answer with units: (10 points) 3. Later in the semester, you will learn that the period of a simple pendulum, T, is given the €Xpr€SSl0n3 m k where the units of T are seconds (5) and the units of the mass m are kilograms (kg ). Use dimensional analysis to determine the units of k . Answer with units: (10 points) 4. Given that light travels with a speed of 3 X 108 m/s, how many centimeters will a pulse of light travel in 1 hour ? Express your answer in scientific notation. Answer with units: Part 2 Problem 1 (20 points total) You get on a train stopped at the station. The train begins moving in a straight line with a uniform acceleration of 1.4 m/sz. The next station is 1.5 km away. At exactly half the distance to the next station, the train’s acceleration becomes zero. (10 points) (a) What is the maximum velocity that the train reaches? Answer with units: (10 points) (b) How long does it take to travel from the first station to the second station? (Assume the train passes the second station without stopping or changing speed.) Answer with units: Part 2 Problem 2 (30 points total) A rocket on earth is launched from rest vertically into the air. For 50 seconds the engines cause the rocket to accelerate upward at a constant 1.8 m/sz, 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 50 seconds. Answer with units: Answer with units: (10 points) (0) Use the information from (a) and (b) to find how long it takes for the rocket to free fall back to the ground after the engines cutoff. Add this time to the time from takeoff to engine cutoff. Answer with units: 2:: Part 2 Problem 3 (10 points total) (10 points) 3. You drop a tennis ball from a height of l m, with no initial velocity. It hits the ground and rebounds in the opposite direction with 80 percent of the speed it had just prior to hitting the floor. If the ball is in contact with the floor for 0.01 seconds, what is its average acceleration for the period it is in contact with the floor? Define “down” to be the —y direction. Answer with units: ...
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This homework help was uploaded on 04/09/2008 for the course PHYS 111n taught by Professor Sukenik during the Spring '08 term at Old Dominion.

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111 examSolutions - Old Dominion University Fall 1999 Physics 111N Introductory General Physics Professor C Sukenik EXAM 1 Sept 23 1999 11:00 am ~

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