(Test Bank) College Physics Reasoning and Relationships

Giordano, 2

Physics

Test Bank

2nd Edition

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Test Bank for College Physics Reasoning and Relationships, The downloadable file consists of 360 pages, and the total size of the file is 4.58 MB. Purchase now only for highly discounted price.

Author(s): Giordano

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Chapter 01: Introduction MULTIPLE CHOICE NARRBEGIN: 1.3 1.3 Dealing with Numbers NARREND 1.Which one of the choices below represents the preferred practice regarding significant figures when adding the following: 12.4 + 14 + 67.37 + 4.201? a.98 c.97.97 b.98.0 d.97.971 ANS: A PTS: 1 DIF: 1 2.Which one of the choices below represents the preferred practice regarding significant figures when multiplying the following: 10.5  8.9  3.11? a.290.6295 c.291 b.290.63 d.290 ANS: D PTS: 1 DIF: 1 3.Calculate (0.82 + 0.042)  (4.49  103), keeping only significant figures. a.3870.8 c.3879 b.3870 d.3900 ANS: D PTS: 1 DIF: 1 4.The length and width of a standard sh eet of paper is measured, and then the area is found by calculation to be 93.500 in2. The number of significant figures in the width measurement must be at least: a.5 c.3 b.4 d.2 ANS: A PTS: 1 DIF: 1 5.The number 0.0001070 has how many significa nt figures? a.2 c.4 b.3 d.7 ANS: C PTS: 1 DIF: 2 6.Multiplying a 4 significant figure number by a 3 significant figure number and then dividing the product by a six significant figure number yields a number with how many significant figures? a.7/6 c.2 b.3 d.13 ANS: B PTS: 1 DIF: 2 7.Modern electroplaters can cover a surface area of 55.0 m2 with one troy ounce of gold (volume = 1.611 cm3). What is the thickness of the electroplated gold? a.3.64  10−7 m c.1.83  10−6 m b.1.46  10−9 m d.2.93  10−8 mANS: D PTS: 1 DIF: 3 8. The basic function of an automobile’s carburetor is to atomize the gasoline and mix it with air to promote rapid combustion. Assume that 40 cm3 of gasoline is atomized into N spherical droplets. Each droplet has a radius of 2.0  10−5 m. Find the total surface area of these N spherical droplets. a. 60,000 cm2 c. 20,000 cm2 b. 24,000 cm2 d. 2800 cm2 ANS: A PTS: 1 DIF: 3 9. A circle has an area of 2.0 m2. A second circle has triple the radius of the first . The area of the second circle is _____ times that of the first. a. 27 c. 3.0 b. 9.0 d. 0.67 ANS: B PTS: 1 DIF: 2 10. tripling the radius of a sphere results in increasing its volume by a factor of a. 27 c. 9 b. 27 d. 3 ANS: B PTS: 1 DIF: 2 11. Two numbers, one with 4 significant figures and the other with 3 significant figures, are combined using the math operations given below. Which operation can give a result with fewer than 3 significant figures? a. addition c. multiplication b. subtract ion d. division ANS: B PTS: 1 DIF: 2 NARRBEGIN: 1.4 1.4 Physical Quantities and Units of Measure NARREND 12. A room in a house has a floor area of 160 ft2. Which of the following is most likely the approximate volume of the room? a. 4000 m3 c. 40 m3 b. 400 m3 d. 4 m3 ANS: C PTS: 1 DIF: 2 13. In 1983 the standard meter was redefined to what it is currently. What was the previous definition from 1960 based on? a. specific alloy bar housed at Sevres, France b. wavelength of light emitted by certa in krypton atoms c. distance from the Earth’s equator to the North Pole d. the distance light travels in a certain fraction of a second ANS: B PTS: 1 DIF: 1 14. The current standard definition for the second has been based on which of the following? a. characteristic frequency of the light from cesium atoms b. average solar day c. sidereal day d. Greenwich Civil Time ANS: A PTS: 1 DIF: 1 15. In mechanics, physicists use three basic quantities to derive additional quantities. Mass is one of th e three quantities. What are the other two? a. length and force c. length and time b. power and force d. force and time ANS: C PTS: 1 DIF: 1 16. The prefixes which are abbreviated p, n, and T represent which of the following? a. 10−2, 10−6, and 1015 c. 10−12, 10−9, and 1012 b. 10−9, 106, and 1010 d. 10−15, 10−6, and 1015 ANS: C PTS: 1 DIF: 1 17. The ratio M/m of the prefixes M and m has what value? a. 103 c. 109 b. 106 d. 1018 ANS: C PTS: 1 DIF: 2 18. One year is about _____ seconds while one day is exactly _____ seconds. a. 3.16  107, 86,400 c. 3.16  107, 8640 b. 5.26  105, 86,400 d. 1.04  106, 36,000 ANS: A PTS: 1 DIF: 2 19. On planet Q the standard unit of volume is called the guppy. Space travelers from Eart h have determined that one liter = 38.2 guppies. How many guppies are in 200 liters? a. 70.2 guppies c. 5.24 guppies b. 9.74 guppies d. 7640 guppies ANS: D PTS: 1 DIF: 2 20. On planet Z, the standard unit of length is the foose. Ann the Astronaut is 5.90 feet tall on Earth. She lands on planet Z and is measured to be 94 foosi tall. Her partner Rachael is 83 foosi tall. How tall is Rachael on Earth? a. 5.2 feet c. 5.8 feet b. 5.5 feet d. 6.3 feet ANS: A PTS: 1 DIF: 2 21. A furlong is a distance o f 220 yards. A fortnight is a time period of two weeks. A horse is running at a speed of 4.00 yards per second. What is his speed in furlongs per fortnight? a. 2200 furlongs/fortnight c. 11,000 furlongs/fortnight b. 4980 furlongs/fortnight d. 22,000 furlo ngs/fortnight ANS: D PTS: 1 DIF: 2 22. A cereal box has the dimensions of 0.19 m  0.28 m  0.080 m. If there are 3.28 feet per meter, then what is the volume of the box in cubic feet? a. 0.0043 cubic feet c. 0.046 cubic feet b. 0.15 cubic feet d. 0.0014 cubic feet ANS: B PTS: 1 DIF: 2 23. The distance to the Andromeda Galaxy is estimated at about 2  106 light years. A light year is the distance traveled by light in one year; if the speed of light is 3  108 m/s, about how far is it from our galaxy to Andromeda? (1 year = 3.15  107 s) a. 10  1015 m c. 2  1022 m b. 1  1018 m d. 6  1012 m ANS: C PTS: 1 DIF: 2 24. A cement truck can pour 40 cubic yards of cement per hour. Express this in ft3/min. a. 2/3 ft3/min c. 6 ft3/min b. 18 ft3/min d. 2.0 ft3/min ANS: B PTS: 1 DIF: 2 25. Water flows into a swimming pool at the rate of 12 gal/min. The pool is 16 ft wide, 32 ft long and 6.0 ft deep. How long does it take to fill? (1 U.S. gallon = 231 cubic inches) a. 32 hours c. 48 hours b. 64 hours d. 24 hours ANS: A PTS: 1 DIF: 2 26. When NASA was communicating with astron auts on the moon, the time from sending on the Earth to receiving on the moon was 1.28 s. Find the distance from Earth to the moon. (The speed of radio waves is 3.00  108 m/s.) a. 240,000 km c. 480,000 km b. 384,000 km d. 768,000 km ANS: B PTS: 1 DIF: 2 27. The mass of the Sun is 2.0  1030 kg, and the mass of a hydrogen atom is 1.67  10−27 kg. If we assume that the Sun is mostly composed of hydrogen, how many atoms are there in the Sun? a. 1.2  1056 atoms c. 1.2  1057 atoms b. 3.4  1056 atoms d. 2.4  1057 atoms ANS: C PTS: 1 DIF: 2 28. The information on a one -gallon paint can is that the coverage, when properly applied, is 270 ft2. One gallon is 231 in3. What is the average thickness of the paint in such an application? a. 0.0036 in. c. 0.043 in. b. 0.0059 in. d. 0.053 in. ANS: B PTS: 1 DIF: 3 29. Which of the following conversion factors is not exact? a. 12 in. = 1 ft c. b. d. ANS: C PTS: 1 DIF: 1 NARRBEGIN: 1.5 1.5 Dimensions and Units NARREND 30. When SI units are plugged into an equation, it is found that the units balance. Which of the following can we expect to be true for this equation? a. The equation will be dimensionally c orrect. b. The equation will be dimensionally correct except sometimes in cases when the right -hand side of the equation has more than one term. c. The equation will not be dimensionally correct. d. All constants of proportionality will be correct. ANS: A PTS: 1 DIF: 1 31. Which formula is dimensionally consistent with an expression yielding a value for velocity? ( v is velocity, x is distance, and t is time) a. v/t2 c. v2/t b. vx2 d. v2t/x ANS: D PTS: 1 DIF: 1 32. Which expression is dimension ally consistent with an expression that would yield a value for time−1?(v is velocity, x is distance, and t is time) a. v/x c. x/t b. v2/x d. v2t ANS: A PTS: 1 DIF: 1 33. If the displacement of an object, x, is related to velocity, v, according to th e relation x = Av, the constant, A, has the dimension of which of the following? a. volume c. time b. length d. area ANS: C PTS: 1 DIF: 1 34. The speed of a boat is often given in knots. If a speed of 5 knots were expressed in the SI system of units, the units would be: a. m c. m/s b. s d. kg/s ANS: C PTS: 1 DIF: 1 35. If v is velocity, x is position, and t is time, then which equation is not dimensionally correct? a. t = x/v c. v = t/x b. = v2/x2 d. t2 = 2x2/v2 ANS: C PTS: 1 DIF: 1 36. Suppose an equation relating position, x, to time, t, is given by x = bt3 + ct4, where b and c are constants. The dimensions of b and c are respectively: a. T3, T4. c. L/T3, L/T4. b. 1/T3, 1/T4. d. L2T3, L2T4. ANS: C PTS: 1 DIF: 2 37. Areas always have dimensions _____ while volumes always have dimensions _____. a. m2, m3 b. L2, L3 c. Both a and b are correct. d. No answer is correct because of the “always.” ANS: B PTS: 1 DIF: 1 38. The unit slug has what dimensions? a. L c. b. M d. ANS: B PTS: 1 DIF: 1 39. Volume can be measured in units of Which of the following unit combinations also result in volume? a. c. b. d. ANS: C PTS: 1 DIF: 1 NARRBEGIN: 1.6 1.6 Algebra and Simultaneous Equations NARREND 40. Note the expr ession: y = x2. Which statement is most consistent with this expression? a. if y doubles, then x quadruples c. if x doubles, then y doubles b. y is greater than x d. if x doubles, then y quadruples ANS: D PTS: 1 DIF: 1 41. Note the expression: y = A/x2. Which statement is most consistent with this expression? a. y is less than A b. if x is doubled, y is multiplied by a factor of four c. if x is halved, y is multiplied by a factor of four d. y is greater than x ANS: C PTS: 1 DIF: 2 42. For whic h of the values below is x > x3? a. x = −1.5 c. x = 1.0 b. x = 0 d. x = 1.5 ANS: A PTS: 1 DIF: 1 NARRBEGIN: 1.7 1.7 Trigonometry NARREND 43. Consider the cosine of any angle between 35° and 40°. If the angle were doubled, what would happen to the c osine of the angle. a. It would halve. b. It would decrease to less than half its original value. c. It would decrease but be more than half its original value. d. In different cases, it could do any of the above. ANS: B PTS: 1 DIF: 2 44. A high fo untain of water is in the center of a circular pool of water. You walk the circumference of the pool and measure it to be 170 meters. You then stand at the edge of the pool and use a protractor to gauge the angle of elevation of the top of the fountain. It is 51°. How high is the fountain? a. 17 m c. 30 m b. 23 m d. 33 m ANS: D PTS: 1 DIF: 3 45. A right triangle has sides 5.0 m, 12 m, and 13 m. The largest angle not 90° of this triangle is nearest: a. 21°. b. 23°. c. 67°. d. Not attainable since th is is not a right triangle. ANS: C PTS: 1 DIF: 2 46. If  = 90° – , what is the value of sin2  + sin2 ? a. 0 c. −1 b. 1 d. The answer depends on . ANS: B PTS: 1 DIF: 2 47. A triangle has sides of lengths 14 cm and 50 cm. If the triangle is a right triangle, which of the following could be the length o f the third side? a. 26 cm c. 48 cm b. 36 cm d. 64 cm ANS: C PTS: 1 DIF: 2 48. A train slowly climbs a 600 -m mountain track which is at an angle of 10.0° with respect to the horizontal. How much altitude does it gain? a. 86.8 m c. 106 m b. 104 m d. 492 m ANS: B PTS: 1 DIF: 2 49. If and are each first quadrant angles, which of the following must be true if ? a. c. b. d. ANS: B PTS: 1 DIF: 2 50. Suppose the interior angles of a triangle are , , and , with . Which side of the triangle is the shortest? a. The side opposite . c. The side opposite . b. The side opposite . d. More information is needed unless the triangle is a right triangle. ANS: C PTS: 1 DIF: 2 NARRBEGIN: 1.8 1.8 Vectors NARREND 51. Which point is nea rest the y axis? a. (−3, 4) c. (−5, 3) b. (4, 5) d. (5, −2) ANS: A PTS: 1 DIF: 1 52. Each edge of a cube has a length of 50.8 cm. What is the length of a diagonal of the cube going through the center of the cube? a. 20.0 in c. 34.6 in b. 28.8 in d. 50.8 in ANS: C PTS: 1 DIF: 3 53. If point A is located at coordinates (2, −3) and point B is located at coordinates ( −3, 9), what is the distance from A to B if the units of the coordinated system are meters? a. 17 m c. 13 m b. 10 m d. 20 m ANS: C PTS: 1 DIF: 2 54. Vectors have magnitudes 6, 11, and 22. When these vectors are added, what is the least possible magnitude of their addition? a. 25 c. 5 b. 15 d. 3 ANS: C PTS: 1 DIF: 2 55. Four vectors all have the same magnitude. Vector 1 is at 30 , Vector 2 is at 110, vector 3 is at 240 , and Vector 4 is at 315 . Which vector has the greatest magnitude x component and which vector has the least magnitude y component? a. Vector 1, Vector 2 c. Vector 1, Vector 1 b. Vector 4, Vector 4 d. Vector 3, Vector 2 ANS: C PTS: 1 DIF: 2 56. Vector 1 is 7 units long and is at 70 . Vector 2 is 5 units long and is at 155 . Vector 3 is 3 units long and is at 225 . Which vector has equal magnitude components? a. Vector 1 b. Vector 2 c. Vector 3 d. None of the vectors has e qual magnitude components. ANS: C PTS: 1 DIF: 2 57. Which type of quantity is characterized by both magnitude and direction? a. scalar c. trigonometric b. vector d. algebraic variable ANS: B PTS: 1 DIF: 1 58. Which of the following is an example of a vector quantity? a. velocity c. volume b. temperature d. mass ANS: A PTS: 1 DIF: 1 59. When we subtract a velocity vector from another velocity vector, the result is: a. another velocity. c. a displacement. b. an acceleration. d. a scalar. ANS: A PTS: 1 DIF: 1 60. Of vectors with lengths 5 m, 3 m, and 4 m, which has the greatest magnitude x component? a. the one with length 5 m c. the one with length 4 m b. the one with length 3 m d. It could be any of the three. ANS: D PTS: 1 DIF: 1 61. A student adds two vectors with magnitudes of 200 and 70. Which one of the following is the only possible choice for the magnitude of their sum? a. 100 c. 200 b. 280 d. 70 ANS: C PTS: 1 DIF: 1 62. Vector points north and vector points east. If , then vector points: a. north of east. c. north of west. b. south of east. d. south of west. ANS: C PTS: 1 DIF: 2 63. Vector is 5 m long and vector is 12 m long. The length of the sum of the vectors must be: a. some value from 7 m to 17 m. c. 17 m. b. 13 m. d. 8 m. ANS: A PTS: 1 DIF: 1 64. When three vectors are added graphically and form a closed triangle, the largest enclosed angle between any two of the vectors cannot be greater than: a. 60. c. 180. b. 90. d. No maximum exists. ANS: C PTS: 1 DIF: 2 65. In a 2 -dimensional Cartesian coordinate system the y component of a given vector is equal to that vector’s magnitude multiplied by which trigonometric function, with respect to the an gle between vector and x axis? a. sine c. tangent b. cosine d. cotangent ANS: A PTS: 1 DIF: 1 66. In a 2 -dimensional Cartesian coordinate system the x component of a given vector is equal to that vector’s magnitude multiplied by which trigonometric f unction, with respect to the angle between vector and y axis? a. sine c. tangent b. cosine d. cotangent ANS: A PTS: 1 DIF: 2 67. In a 2 -dimensional Cartesian system, the y component of a vector is known, and the angle between vector and x axis is kno wn. Which operation is used to calculate the magnitude of the vector (taken with respect to the y component)? a. dividing by cosine c. multiplying by cosine b. dividing by sine d. multiplying by sine ANS: B PTS: 1 DIF: 2 68. A taxicab moves five blo cks due north, five blocks due east, and another three blocks due north. Assume all blocks are of equal size. How far is the taxi from its starting point? a. 13 blocks c. 9.2 blocks b. 9.4 blocks d. 8.6 blocks ANS: B PTS: 1 DIF: 2 69. Find the sum of the following two vectors: (i) 50 units due east and (ii) 100 units 30  south of west. a. 100 units 30  south of west c. 87 units 60  south of west b. 62 units 54  south of west d. 62 units 15  south of west ANS: B PTS: 1 DIF: 2 70. Arvin the Ant travels 30 cm eastward, then 25 cm northward, and finally 10 cm westward. In what direction is Arvin now in with respect to his starting point? a. 59 N of E c. 29 N of W b. 29 N of E d. 51 N of E ANS: D PTS: 1 DIF: 2 71. Vector is 3.0 units in length and points along the positive x axis; vector is 5.0 units in length and points along a direction 150  from the positive x axis. What is the magnitude of the resulting vector when vectors and are added? a. 7.0 c. 2.8 b. 6.7 d. 2.1 ANS: C PTS: 1 DIF: 2 72. Vector is 3.0 units in length and points along the positive x axis; vector is 5.0 units in length and points along a direction 150  from the positive x axis. What is the direction of their sum with respect to the positive x axis? a. 62 c. 118 b. 13 d. 103 ANS: C PTS: 1 DIF: 2 73. I walk six miles in a straight line in a direction north of east, and I end up four miles north and several miles east. How many degrees north of east have I walked? a. 19 c. 60 b. 42 d. 71 ANS: B PTS: 1 DIF: 2 Chapter 02: Motion, Forces, and Newton’s Laws MULTIPLE CHOICE NARRBEGIN: 2.2 2.2 What is Motion? NARREND 1. Which formula is dimensionally consistent with an expression yielding a value for velocity? ( a is acceleration, x is distance, and t is time) a. v/t2 c. v2/t b. vx2 d. at ANS: D PTS: 1 DIF: 1 2. If a is acceleration, v is velocity, x is position, and t is time, then which equation is not dimensionally correct? a. t = x/v c. v = a/t b. a = v2/x d. t2 = 2x/a ANS: C PTS: 1 DIF: 1 3. When we add a displacement vector to another displacement vector, the result is: a. a velocity. c. another displacement. b. an acceleration. d. a scalar. ANS: C PTS: 1 DIF: 1 4. When NASA was communicating with astronauts on the Moon, the time from sendi ng on the Earth to receiving on the moon was 1.33 s. Find the distance from Earth to the Moon. (The speed of radio waves is 3.00  108 m/s.) a. 240,000 km c. 399,000 km b. 384,000 km d. 768,000 km ANS: C PTS: 1 DIF: 2 5. In which of the following cases is the displacement’s magnitude half the distance traveled? a. 10 steps east followed by 3 steps west c. 5 steps east followed by 10 steps west b. 22 steps east followed by 11 steps west d. 15 steps east followed by 5 steps west ANS: D PTS: 1 DIF: 2 6. A change in a physical quantity w having initial value wi and final value wf is given by which of the following? a. wi − wf c. (wf + wi)/2 b. wf − wi d. none of the above ANS: B PTS: 1 DIF: 1 7. Displacement is which of the following types of quantities? a. vector c. magnitude b. scalar d. dimensional ANS: A PTS: 1 DIF: 1 8. A truck moves 70 m west, then moves 120 m east, and finally moves west again a distance of 90 m. If east is chosen as the positive direction, what is the truck’s resultant displacement? a. 40 m c. 280 m b. − 40 m d. −280 m ANS: B PTS: 1 DIF: 2 9. Which of the following is not a vector quan tity? a. temperature c. acceleration b. velocity d. displacement ANS: A PTS: 1 DIF: 1 10. In one -dimensional motion, the average speed of an object that moves from one place to another and then back to its original place has which of the following pr operties? a. It is positive. c. It is zero. b. It is negative. d. It can be positive, negative, or zero. ANS: A PTS: 1 DIF: 2 11. In one -dimensional motion where the direction is indicated by a plus or minus sign, the average velocity of an object ha s which of the following properties? a. It is positive. c. It is zero. b. It is negative. d. It can be positive, negative, or zero. ANS: D PTS: 1 DIF: 1 12. An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the sign associated with the average velocity of the object? a. + c. 0 (no sign) b. − d. any of the above ANS: C PTS: 1 DIF: 1 13. An object moves 10 m east in 30 s and then returns to its starting point taking an additional 70 s. If west is chosen as the positive direction, what is the average speed of the object? a. 0.20 m/s c. 0.50 m/s b. –0.20 m/s d. 0 m/s ANS: A PTS: 1 DIF: 2 14. A bird, accelerating from rest at a constant rate, experiences a displacement of 37 m in 11 s. What is the average velocity? a. 1.7 m/s c. 3.4 m/s b. 2.5 m/s d. zero ANS: C PTS: 1 DIF: 1 15. Jeff throws a ball straight up. For which situation is the vertical velocity zero? a. on the way up c. on the way back down b. at the top d. none of the above ANS: B PTS: 1 DIF: 1 16. A railroad train travels forward along a straight track at 80.0 m/ s for 1000 m and then travels at 40.0 m/s for the next 1000 m. What is the average velocity? a. 60.0 m/s c. 63.7 m/s b. 37.5 m/s d. 53.3 m/s ANS: D PTS: 1 DIF: 3 17. The distance of the Earth from the Sun is 93,000,000 miles. If there are 3.15  107 s in one year, find the speed of the Earth in its orbit about the Sun. a. 9.28 miles/s c. 27.9 miles/s b. 18.6 miles/s d. 37.2 miles/s ANS: B PTS: 1 DIF: 2 18. A ball is thrown vertically upwards at 9.8 m/s. For its complete trip (up and back down t o the starting position), its average velocity is: a. 19.6 m/s. c. 4.90 m/s. b. 9.80 m/s. d. not given. ANS: D PTS: 1 DIF: 1 19. Changing the positive direction in a reference frame to the opposite direction does not change the sign of which of the f ollowing quantities? a. velocity c. speed b. average velocity d. displacement ANS: C PTS: 1 DIF: 1 20. On a position -time graph, the slope of the straight line joining two points on the plotted curve that are separated in time by the interval t, is which of the following quantities? a. average steepness c. instantaneous velocity b. average velocity d. average acceleration ANS: B PTS: 1 DIF: 1 21. A European sports car dealer claims that his car will accelerate at a constant rate from rest to 10 0 km/hr in 8.00 s. If so, what is the acceleration? ( Hint: First convert speed to m/s.) a. 3.47 m/s2 c. 11.4 m/s2 b. 4.63 m/s2 d. 18.5 m/s2 ANS: A PTS: 1 DIF: 2 22. A European sports car dealer claims that his product will accelerate at a constant ra te from rest to a speed of 100 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. 34.7 m/s c. 23.1 m/s b. 44.4 m/s d. 17.4 m/s ANS: D PTS: 1 DIF: 2 23. An x-t graph is drawn for a bal l moving in one direction. The graph starts at the origin and at t = 6 s the velocity of the ball is zero. We can be positive that at t = 6 s, a. the slope of the curve is non -zero. b. the acceleration is constant. c. the ball has stopped. d. none of th e above answers is always correct. ANS: C PTS: 1 DIF: 1 24. A v-t graph is drawn for a ball moving in one direction. The graph starts at the origin and at t = 6 s the acceleration of the ball is zero. We know that at t = 6 s, a. the slope of the curve is non -zero. c. the velocity of the ball is not changing. b. the curve is not crossing the time axis. d. the curve is at v = 0, t = 0. ANS: C PTS: 1 DIF: 1 25. The value of an object’s acceleration may be characterized in equivalent words by which o f the following? a. displacement c. velocity b. rate of change of displacement d. rate of change of velocity ANS: D PTS: 1 DIF: 1 26. A 50 -g ball traveling at 25.0 m/s is bounced off a brick wall and rebounds at 20.0 m/s. A high -speed camera records this event. If the ball is in contact with the wall for 3.50 ms, what is the magnitude of the average acceleration of the ball during this time interval? a. 714 m/s2 c. 6430 m/s2 b. 1430 m/s2 d. 12,900 m/s2 ANS: D PTS: 1 DIF: 2 27. An object is dropp ed from a height. Once it is moving, which of the following statements is true, at least at one point? a. Its velocity is more than its acceleration. b. Its velocity is less than its acceleration. c. Its velocity is the same as its acceleration. d. Its velocity is never equal to its acceleration. ANS: D PTS: 1 DIF: 2 28. The slope of the acceleration -time curve represents: a. the velocity. b. the rate of change of acceleration. c. the rate of change of displacement. d. the area under the positio n vs. time curve. ANS: B PTS: 1 DIF: 1 29. A strobe photograph shows equally spaced images of a car moving along a straight road. If the time intervals between images is constant, which of the following cannot be positive? a. the speed of the car c. the acceleration of the car b. the average velocity of the car d. the direction of motion of the car ANS: C PTS: 1 DIF: 2 30. A strobe photograph of a car moving along a straight road shows the interval between each successive image to be diminishing. If the direction of motion of the car is taken as positive, which of the following are negative? a. the speed of the car c. the average acceleration of the car b. the average velocity of the car d. all of the above ANS: C PTS: 1 DIF: 2 31. A ball is pushed downhill with an initial velocity of 3.0 m/s. The ball rolls down a hill with a constant acceleration of 1.6 m/s2. The ball reaches the bottom of the hill in 6.0 s. What is the ball’s velocity at the bottom of the hill? a. 10 m/s c. 16 m/s b. 13 m /s d. 17 m/s ANS: B PTS: 1 DIF: 2 32. A bird, accelerating from rest at a constant rate, experiences a displacement of 37 m in 11 s. What is the final velocity after 11 s? a. 6.7 m/s c. 13 m/s b. 5.1 m/s d. zero ANS: A PTS: 1 DIF: 2 33. A bird, accelerating from rest at a constant rate, experiences a displacement of 37 m in 11 s. What is its acceleration? a. 0.20 m/s2 c. 0.51 m/s2 b. 0.31 m/s2 d. 0.61 m/s2 ANS: D PTS: 1 DIF: 2 34. In the case of constant acceleration, the average velocity equals the instantaneous velocity: a. at the beginning of the time interval. b. at the end of the time interval. c. half-way through the time interval. d. three -fourths of the way through the time interval. ANS: C PTS: 1 DIF: 2 35. A particle moves east at constant velocity for a time interval t. It then moves north at a constant velocity, with the same speed as before, for another time interval t Finally it moves east again with the original velocity. At the instant an additional time interval t has elapsed, which of the following are true about the average velocity and the average acceleration for the motion described? a. The average velocity is and the average acceleration is zero. b. The average velocity is and the average acceleration is not zero. c. The average velocity is not and the average acceleration is zero. d. The average velocity is not and the average acceleration is not zero. ANS: C PTS: 1 DIF: 3 36. The first displacement is 7 m and the second displacement is 3 m. They cannot add together to give a total displacement of: a. 10 m. c. 4 m. b. 7 m. d. 3 m. ANS: D PTS: 1 DIF: 1 37. An object, initially moving in the negative x direction, is subjected to a change in velocity in the negative y direction. If the res ulting velocity vector is drawn from the origin, into which quadrant does this vector point? a. 1st b. 2nd c. 3rd d. None, since the object is now moving in the negative y direction.