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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 21
Part 12 Part 22
Part 1—3 Part 2—3 Part 14 Total Score Part 1 (40 points total) (10 points) 1. If three gallons of paint are requiredto 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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 Spring '08
 Sukenik
 Physics, Acceleration, Velocity, Old Dominion University, Professor C. Sukenik

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