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National Institute of Physics Name: Student Number: 2nd Semester AY 20102011 Physics 71 Section: Date: Instructor: A-1 National Institute of Physics...

HINDI TAMAD. As an exercise every morning, Juan walks to his favorite bakery, five kilometers away from his house. On the way back to his house, he always sprints. Which of the following statements is ALWAYS TRUE?
National Institute of Physics  2 nd  Semester AY 2010-2011                     Physics 71 Name: Section: Student Number: Date: Instructor: A-1
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National Institute of Physics  2 nd  Semester AY 2010-2011                     Physics 71 INSTRUCTIONS:  Choose the  best  answer. Ignore air resistance, unless otherwise stated in a question.  Acceleration due to gravity on the surface of the surface of the earth is  9.81 m/s 2 . For the first three questions refer to the diagram below. The single, double, triple and quadruple headed vectors are the vectors   and .   The coordinate system used is the standard Cartesian coordinate system as shown. [The diagram is drawn to scale.  1. BOW AND ARROW.  Which of the following is equal to vector ? A. B. C. D. E. 2. QUADRANT . Which quadrant vector    belongs? A. Quadrant I B. Quadrant II C. Quadrant III D. Quadrant IV E. None of the above 3.   X-STEREO.  Which of the following vectors has the least magnitude of x-component. A. B. C. D. E.   have all the same magnitude of x component. 4. HINDI TAMAD.   As an exercise every morning, Juan walks to his favorite bakery, five kilometers away from his house.  On the way back to his house, he always sprints. Which of the following statements is  ALWAYS TRUE A. Juan’s average speed for the whole trip is zero.  B. Juan’s average speed for the whole trip is equal to the magnitude of his average velocity. C. The magnitude of Juan’s displacement for the whole trip is greater than the distance he traveled. D. The magnitude of Juan’s displacement for the whole trip is equal to the dis tance he traveled. E. The magnitude of Juan’s displacement for the whole trip is less than the distance he traveled. 5. KINEMATICS.  Which of the following is  NOT  possible? A. An object has velocity directed east and acceleration directed west. B. An object has velocity directed east and acceleration directed east. C. An object has zero velocity but non-zero acceleration. D. An object has constant non-zero acceleration and changing velocity. E. An object has constant non-zero velocity and changing acceleration. 6. X vs. t.  Shown below is a graph of an object’s position as a function of time. Which of the following statements best  describes the object’s motion? (Assume the forward direction to be the positive direction.)  A. The object is moving at a constant velocity. It then slows down and stops. B. The object is initially not moving. It then moves backward and stops.    2
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