a t =Bx a v s 4 c. at +2ax Exam 1--PHYS 101--F15 Name: Class: Date:
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1 Name: Class: Date: Exam --PHYS 0--F5 Multiple Choice Identify the choice that best completes the statement or answers the question.. Which of these best approximates the volume of a person s head? a. 8 cm 3 b. 80 cm 3 c. 800 cm 3 d cm 3 2. A guy in a kayak can travel approximately what distance in 0 minutes? a. 6 m b. 600 m c m d. 60,000 m 3. Consider this equation. The units for the variables are as follows: (t: s; v: m/s; a: m/s 2 ; x: m) What must be the units for B if the equation is dimensionally correct? a t =Bx a v a. s 2 b. s 4 c. at d. s 4 m 4. Which of these equations is dimensionally correct? I. v 2 =v 02 +2ax II. +xma=mx 2 2 mv2 t III. v= x t a. II b. I & III c. III d. II & III e. all of these are correct 5. Consider this expression. How many significant figures should the final answer have? 4.* a. b. 2 c. 3 d Since 967 the standard definition for the second has been based on which of the following? a. Greenwich Civil Time b. sidereal day c. average solar day d. characteristic frequency of the cesium-33 atom
2 7. Consider the following right triangle. What is the angle, θ? 0. A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 00. km/hr in 8.00 s. What is the speed after the first 5.00 s of acceleration? (Hint: First convert the speed to m/s.) a. 5 b. 70 c. 20 d Consider the triangle in the previous question. What is the length of the hypotenuse? a. 2 m b. 2 m c. 9.0 m d. 82 m 9. Acceleration is the rate of change of velocity. A car accelerates at a rate of 2 m/s 2. What is this in miles/hour 2. ( mile = 609 m) a. 27 mi/hr 2 b. 97,0000 mi/hr 2 c mi/hr 2 d mi/hr 2 e. 9,000 mi/hr 2 a. 7.3 m/s b m/s c m/s d m/s. A ball is pushed with an initial velocity of 4.0 m/s. The ball rolls down a hill with a constant acceleration of.6 m/s 2. The ball reaches the bottom of the hill in 8.0 s. What is the ball's velocity at the bottom of the hill? a. 7 m/s b. 2 m/s c. 6 m/s d. 0 m/s 2
3 2. You throw a ball up with an initial speed of 30 m/s. How long does it take for the ball to return to your hand? a. 2 s b. 3 s c. 4 s d. 6 s e. 9 s 3. You throw a ball up with an initial speed of 30. m/s. What is its maximum height? 5. When throwing a ball straight up, which of the following is true about its velocity and acceleration at the highest point in its path? a. both v 0 and a 0 b. v=0, but a 0 c. v 0, but a=0 d. v=0 and a=0 e. not enough information 6. If the velocity of a car is non-zero (v 0), can the acceleration of the car be zero? a. Absolutely yes! b. Surely not! c. it depends on the velocity 7. A car begins at a velocity of 30 m/s and ends at a velocity of 20 m/s. Which of these position versus time graphs represent this motion? a. 5 m b. 45 m c. 80 m d. 50 m e. 40 m 4. 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 8. a. a b. b c. c d. d Which of these statements represent the motion represented in this plot? a. decreasing speed, negative velocity b. increasing speed, negative velocity c. increasing speed, positive velocity d. decreasing speed, positive velocity 3
4 9. Consider the following graph. What is the velocity at t=8.5s? a. 3 m/s c m/s b. 6 m/s d m/s 20. Consider the graph in the preceding question. What is the average velocity between points E & H (t=6 and seconds, respectively)? a. 6 m/s b. 0.4 m/s c. 2 m/s d. -3 m/s 2. 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. a b. b c. c d. d 4
5 22. Consider this graph of velocity versus time. What distance has this particle traveled between t=0 and t=4 seconds? a. 25 m c. 0 m b. 20 m d. 3 m 23. Consider the graph of velocity versus time in the previous question. What is the acceleration at t=3.5 s? a. 0 m/s 2 b. -6 m/s 2 c. -8 m/s 2 d. 5 m/s 2 e. -2 m/s A vector has a magnitude of 2 m and is 20.0 degrees above the x-axis. What is the x-component of the vector? 25. Consider these 2 vectors. What is the magnitude of their sum, A ä +B ä? Aä = units along the +y axis Bä =24 units at 20.0 degrees above the +x axis a. 6 units b. 30. units c. 25 units d. 42 units a. 20 m b. m c. 4.4 m d. 4. m 5
6 26. Consider these vectors. What is A-B? a. a c. c b. b d. d 27. A vector has a negative x-component and a positive y-component. The magnitude of the y-component is bigger than the x-component. Which of these is the only appropriate angle, measured from the +x axis, for this vector? a. 00 b. 70 c. 80 d. 90 e Who is Dr. Young s favorite student??? a. the guy next to me b. the lady on the front row c. Bill Thornton d. me! 6
7 ID: A Exam --PHYS 0--F5 Answer Section MULTIPLE CHOICE. ANS: D PTS: REF: F5-WWP 2. ANS: B PTS: REF: F5 3. ANS: B PTS: REF: F5-WWP 4. ANS: B PTS: REF: F5 5. ANS: B PTS: REF: F5-WWP 6. ANS: D PTS: REF: F5-WWP 7. ANS: C PTS: REF: F5 8. ANS: C PTS: REF: F5 9. ANS: B PTS: REF: F5 0. ANS: A PTS: DIF: 2 REF: F5-WWP. ANS: A PTS: REF: F5 2. ANS: D PTS: REF: F5 3. ANS: B PTS: REF: F5 4. ANS: B PTS: REF: F5-WWP 5. ANS: B PTS: REF: F5-WWP 6. ANS: A PTS: REF: F5 7. ANS: D PTS: REF: F5-WWP 8. ANS: B PTS: REF: F5 9. ANS: B PTS: REF: F5 20. ANS: A PTS: REF: F5 2. ANS: A PTS: REF: F5 22. ANS: D PTS: REF: F5 23. ANS: B PTS: REF: F5 24. ANS: B PTS: REF: F5-WWP 25. ANS: B PTS: REF: F5--WWP 26. ANS: A PTS: REF: F5-WWP 27. ANS: A PTS: REF: F5-WWP 28. ANS: D PTS:
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