Exam 1 - Examples - PDF

# Exam 1 - Examples - PDF - Page 1 1 If you are driving 90...

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Page 1 1. If you are driving 90 km/h along a straight road and you look to the side for 3.0 s, how far do you travel during this inattentive period? a. 30 m b. 25 m c. 50 m d. 75 m 2. A polar bear starts at the North Pole. It travels 1.0 km South, then 1.0 km East, then 1.0 km North to return to its starting point. This trip takes 30 min. What was the bear's average velocity? a. 0 km/h b. 0.10 km/h c. 3.0 km/h d. 6.0 km/h 3. Can an object's velocity change direction when its acceleration is constant? a. No, this is not possible because it is always speeding up. b. No, this is not possible because it is always speeding up or always slowing down, but it can never turn around. c. Yes, this is possible, and a rock thrown straight up is an example. d. Yes, this is possible, and a car that starts from rest, speeds up, slows to a stop, and then backs up is an example. 4. A car with good tires on a dry road can decelerate at about 5.0 m/s 2 when braking. If the car is traveling at 55 mi/h, how much time does it take the car to stop? a. 9.8 s b. 2.5 s c. 11 s d. 4.9 s 5. An object starts from rest and undergoes uniform acceleration. During the first second it travels 5.0 m. How far will it travel during the third second? a. 5.0 m b. 15 m c. 25 m d. 45 m 6. An object is moving with constant non-zero velocity in the +x axis. The position versus time graph of this object is a. a horizontal straight line. b. a vertical straight line. c. a straight line making an angle with the time axis. d. a parabolic curve.

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9. An object is thrown upward with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity is 3.5 m/s 2 . What is the speed of the object after 2.0 s? a. 5.6 m/s b. 7.0 m/s c. 14 m/s d. 21 m/s 10. A skydiver jumps from a high-flying plane. When she reaches terminal velocity, her acceleration a. is essentially zero. b. is in the upward direction. c. is approximately 9.8 m/s 2 downward. d. is a constant pointing upward. 11. A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.00 s? a. 9.8 m/s upward. b. 9.8 m/s downward. c. zero d. 19.6 downward. 12. A ball is thrown vertically upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?) a. 4:1 b. 2:1 c. 1.7:1 d. 1.4:1
Page 3 13. A ball is thrown straight up with a speed of 36.0 m/s. How long does it take to return to its starting point? a. 3.67 s b. 7.35 s c. 11.0 s d. 14.7 s 14. Two objects are thrown from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street? a. The one thrown up is traveling faster.

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Exam 1 - Examples - PDF - Page 1 1 If you are driving 90...

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