Grika Prof. D.Kyriakakis FALL 2017 MEC PHY 205 EXAM 1 40 PTSI Maltiple Choice: I
ID: 1780127 • Letter: G
Question
Grika Prof. D.Kyriakakis FALL 2017 MEC PHY 205 EXAM 1 40 PTSI Maltiple Choice: Identify the choice that best completes the statement or answers the question 1. When you look at the speedometer in a moving car, you can see the cars e. average acceleration. a. average distance traveled b. instantaneous acceleration e. average speed d. instantancous speed. Acceleration is defined as the CHANGE in a. time it takes to move from one place to another place b. velocity of an object. c. distance divided by the time interval. d. velocity divided by the time interval. e. time it takes to move from one speed to another speed 2. Suppose you are in a car that is going around a curve. The speedometer reads a constant 30 miles per hour. Which of the following is NOT true? a. You and the car are accelerating. b. Your acceleration is constantly changing. c. Your velocity is constant 3. d. Your direction is constantly changing. e Your speed is constant. 4. As an object falls freely in a vacuum, its a. velocity increases. b. acceleration increases. c. both A and B. d. none of the above. Suppose an object is in free fall. Each second the object falls a· the same distance as in the second before b. a larger distance than in the second before. c with the same instantaneous speed. 5. d. with the same average speed e. none of the above 6. A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always in the direction of motion. a. b. c. directed downward. d. directed upward opposite its velocity. 7. When representing velocity as a vector a. the direction of the arrow shows the direction of motion. b. the length of the arrow represents the speed. e. the length of the arrow is drawn to a suitable scale d. all of the above e. none of the aboveExplanation / Answer
Q;1 d) instantaneous speed
Q.2 e) time it takes to move from one speed to other
Q.3 d) your direction is changing continuously
Q,4 a) velocity increases
Q.5 b) a larger distance than in the second before
Q.6 c) always directed downwards
Q.7 d ) all of the above
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