x a = Q v 2 Exam 1--PHYS 101--Fall 2016 Name: Multiple Choice Identify the choice that best completes the statement or answers the question.

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1 Name: Exam 1--PHYS 101--Fall 2016 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of these best approximates the area of a twin mattress (ie, just the area of the top part)? a m 2 b. 0.2 m 2 c. 2 m 2 d. 20 m 2 2. The mass of your desk is approximately a. 1 kg b. 10 kg c. 100 kg d kg 3. Which of these equations is dimensionally correct? I. v= ax II. x=at 2 + vt III. x=2vt 3x v2 ax a. II b. I & III c. III d. II & III e. all of these are correct 4. What must the units of Q be so this equation is dimensionally correct? 5. How many significant figures should the solution to this expression have? a. 4 b. 3 c. 2 d. 1 e Consider the following right triangle. What is the angle, θ? a. 80 b. 40 c. 20 d This coordinate system shows the location of a point at (-3.0,2.0). What is the distance from the origin to this point? x a = Q v 2 a. m/s 2 b. m 2 c. 1/s d. m a. 3.6 m b. 1.0 m c. 4.2 m d. 13 m e. 5.0 m 1

2 8. The volume flow rate tells how much volume of a fluid passes a point in a given time. A typical adult heart has an output volume flow rate of 5 liters per minute. What is this flow rate in cubit feet per second? (1.0 liter = m 3 ; 1 meter=3.28 feet) a. 0.6 ft 3 /s b ft 3 /s c. 2.9x10-9 ft 3 /s d ft 3 /s e ft 3 /s 9. The standard for the meter is based on which of the following? a. the distance light travels in a particular amount of time b. the distance a cesium atom vibrates in a particular amount of time c. the distance a silicon sphere will roll before stopping d. the length of a bar in France 10. The speed limit on some interstate highways is roughly 80. km/h. What is this in meters per second? a. 62 m/s b. 50 m/s c. 22 m/s d. 2.8 m/s 11. You throw a ball up with an initial speed of 50 m/s. How long does it take for the ball to return to your hand? a. 5 s b. 6 s c. 7 s d. 8 s e. 10 s 12. In a slap shot, a hockey player accelerates the puck from a velocity of 5.00 m/s to m/s in the same direction. If this shot takes s, calculate the distance over which the puck accelerates. a m b m c m d m e m 13. Two bikes start from the same point. One bike has a velocity of -16 m/s and the other moves with a velocity of 22m/s What will be the distance between the two bikes after 45s? a. 72 m b. 38 m c m d. 27 m e. 99 m 14. You drive for 30 minutes at 30 mi/hr and then for another 30 minutes at 50 mi/hr. What is your average speed for the whole trip? a. more than 40 mi/hr b. equal to 40 mi/hr c. less than 40 mi/hr d. not enough information 15. You drop a rock off a bridge. When the rock has fallen 4 m, you drop a second rock. As the two rocks continue to fall, what happens to their velocities? a. both increase at the same rate b. the velocity of the second rock increases faster than the velocity of the first c. the velocity of the first rock increases faster than the velocity of the second d. both velocities stay constant 2

3 16. You move along this track, measured in meters, from point A to point B. What is your displacement? 19. Consider this position versus time graph. Which of the following best represents the velocity versus time graph for the object described in the position versus time graph? a. -3 m b. -2 m c. -4 m d. 4 m e. 3 m 17. You throw a ball upward with an initial speed of 10 m/s. Assuming that there is no air resistance, what is its speed when it returns to you? a. less than 10 m/s b. equal to 10 m/s c. more than 10 m/s 18. A car is initially travelling at 10 m/s in the negative direction. Then, it slows to a speed of 5 m/s, still travelling in the negative direction. Which of these position versus time graphs represents the motion of this car? 20. Consider this graph. Describe the motion of the object for these three time periods: A, B, and C. a. A: the object is travelling at a constant speed B: the object has a negative acceleration C: the object is increasing position at a constant rate b. A: the object is not moving B: the object has an increasing speed in the positive direction C: the object is travelling at a constant, positive speed c. A: the object has a constant, non-zero velocity B: the object has an increasing position C: the object has an increasing speed d. A: the object is in the same position B: the object has a positive acceleration C: the object has an increasing speed 3

4 21. Consider this graph. What is the average acceleration of the runner between t=2 and 8 seconds? 24. A vector has a magnitude of 14 m and is 30.0 degrees below the -x-axis. What is the magnitude of the y-component of the vector? a. 12 m b. 24 m c. 7 m d. 8 m a. 1.5 m/s 2 b. 0.0 m/s 2 c. 12 m/s 2 d. 10 m/s 2 e. 1.0 m/s Consider the graph in the previous problem. What is the distance does the runner travel between t=0 and 4 seconds? a. 12 m b. 48 m c. 24 m d. 12 m e. 3.0 m 25. Consider these 2 vectors. What is the magnitude of their sum, A ä + B ä? Aä = 4.00 units along the -x axis (the negative-x axis) Bä = 12.0 units at 30.0 degrees above the +x axis a units b units c units d units e units 26. Consider these vectors. What is A-B? 23. Consider this graph. What is the velocity of the object at t=7 s? a. 0.3 m/s b. 10 m/s c. -3 m/s d m/s e m/s 27. A vector has a negative x-component and a negative y-component. The magnitude of the y-component is smaller than the x-component. Which of these is the only appropriate angle, measured from the +x axis, for this vector? a. 170 b. 80 c. 225 d. 100 e

5 ID: A Exam 1--PHYS 101--Fall 2016 Answer Section MULTIPLE CHOICE 1. ANS: C PTS: 1 REF: F16 2. ANS: B PTS: 1 REF: F16 3. ANS: E PTS: 1 REF: F16 4. ANS: B PTS: 1 REF: F16 5. ANS: B PTS: 1 REF: F16 6. ANS: B PTS: 1 REF: F15-Final,F16 7. ANS: A PTS: 1 REF: F16 8. ANS: E PTS: 1 REF: F16 9. ANS: A PTS: 1 REF: F ANS: C PTS: 1 REF: F16, Tutor 11. ANS: E PTS: 1 REF: F ANS: C PTS: 1 REF: F16, 2-step, openstax 13. ANS: C PTS: 1 REF: F16, Openstax 14. ANS: B PTS: 1 REF: F15-WWP, F ANS: A PTS: 1 REF: F ANS: C PTS: 1 REF: F ANS: B PTS: 1 REF: F ANS: B PTS: 1 REF: F ANS: C PTS: 1 REF: F ANS: B PTS: 1 REF: F ANS: E PTS: 1 REF: F ANS: C PTS: 1 REF: F ANS: C PTS: 1 REF: F ANS: C PTS: 1 REF: F ANS: C PTS: 1 REF: F ANS: A PTS: 1 REF: F ANS: E PTS: 1 REF: F16 1

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