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Exam #1 (S05) temp

# Exam #1 (S05) temp - PHYSICS103 First Exam NameRow 24...

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Name                                                           Row First Exam 24 February 2005 Please put the letter corresponding to the best answer in the blanks at the left. Each question counts two points. 1. The steepness of the curve on a position versus time curve tells us the _____ of the object. a. speed b. acceleration c. displacement d. rapidity 2. Which of the following could be a velocity? a. 5 meters west b. 5 meters per second west c. 5 meters per second d. 5 meters per second per second 3. An object is accelerating a. only when its speed changes. b. only when its direction changes. c. when its speed or direction changes. d. if its velocity is large. 4. A baseball is hit with a horizontal speed of 22 m/s and a vertical speed of 14 m/s upward. What are these speeds 1 s later? a. 22 m/s horizontal and 4 m/s upward b. 22 m/s horizontal and 24 m/s upward c. 12 m/s horizontal and 4 m/s upward d. 12 m/s horizontal and 14 m/s upward 5. If there is no net force acting on an object, its motion will be one with ______ acceleration. a. zero b. a constant, non-zero c. an increasing d. a decreasing 6. If an object moves with a constant velocity, we can conclude that a. the object has a very large inertia. b. the object is moving toward its natural place. c. there are no forces acting on the object. d. there is no unbalanced (net) force acting on the object. 7. An object is dropped off a cliff. How far will the object fall during the next four seconds? a. 40 m b. 45 m c. 80 m d. 125 m 8. What is the net force on a 1200-kg car that is traveling in a straight line at a constant speed of 35-m/s? a. zero b. 35 N c. 1200 N d. (35 m/s)(1200 kg) 9. If the force of friction on a child's scooter is 40 N, how much force must be applied to the scooter to maintain a constant velocity of 6 m/s west? a. 39 N b. 40 N c. 41 N d. 240 N 10. Which of the following statements about projectile motion is true? a. The horizontal and vertical motions are independent. b. The force on the projectile is constant throughout the flight. c. The acceleration of the projectile is constant throughout the flight.

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Exam #1 (S05) temp - PHYSICS103 First Exam NameRow 24...

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