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# 2.1-Kinematics%202D-Projectile.pdf

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School
Department
Physics
Course
PHYSICS 1L03
Professor
Reza Nejat
Semester
Fall

Description
Phys 1L03 Conceptual Multiple choices questions 2-1 – Kinematics 2D, Projectile 1. A car travels due east at 22 m/s. It makes a turn due south and continues to travel at 22 m/s. What is the change in velocity of the car? a. 22 m/s, due east b. 22 m/s, due south c. 31 m/s, 45° south of west d. 31 m/s, 45° south of east e. zero m/s 2. During a one-hour trip, a small boat travels 80.0 km north and then travels 60.0 km east. What is the boat's displacement for the one-hour trip? a. 20 km b. 100 km c. 140 km d. 280 km 3. During a one-hour trip, a small boat travels 80.0 km north and then travels 60.0 km east. What is the boat's average speed during the one-hour trip? a. 20 km/h b. 100 km/h c. 140 km/h d. 280 km/h e. 10 000 km/h 4. During a one-hour trip, a small boat travels 80.0 km north and then travels 60.0 km east. What is the magnitude of the boat's average velocity for the one-hour trip? a. 20 km/h b. 100 km/h c. 140 km/h d. 10 000 km/h e. 20 000 km/h 5. What is the direction of the boat's average velocity of question 4 above for the one-hour trip? a. due east b. 36.9° north of east c. 41.7° north of east d. 49.2° north of east e. 53.1° north of east 6. A football is kicked at an angle ▯ above to the horizontal. Which one of the following statements best describes the acceleration of the football during this event if air resistance is neglected? 2 a. The acceleration is zero m/s a2 all times. b. The acceleration is zero m/s when the football has reached the highest point in its trajectory. c. The acceleration is positive as the football rises, and it is negative as the football falls. 2 d. The acceleration is 9.8 m/s at all t2mes. e. The acceleration starts at 9.8 m/s and drops to some constant lower value as the ball approaches the ground. 7. An object is thrown at an angle ▯ above the ground. Which statement below is true? a. There is a place along the trajectory where the velocity and acceleration are parallel and in the same direction? b. There is a place along the trajectory wher
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