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Physics: Principles With Applications, 7th Edition Test Bank

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    Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Approximately how many pennies would you have to stack to reach an average 8 - foot ceiling? 1) A) 2 × 10 3 B) 2 × 10 2 C) 2 x 10 6 D) 2 × 10 4 E) 2 × 10 5 Answer: A Diff: 0 Type: MC 2) What is 0.674 0.74 to the proper number of significant figures? 2) A) 0.91 B) 0.9108 C) 0.911 D) 0.9 Answer: A Diff: 0 Type: MC 3) If, in a parallel universe, Δ has the value 3.14149, express Δ in that universe to four significant figures. 3) A) 3.141 B) 3.142 C) 3.1415 D) 3.1414 Answer: A Diff: 0 Type: MC 4) Express ( 4.3 × 10 6 ) - 1/2 in scientific notation. 4) A) 2.1 × 10 4 B) 2.1 × 10 3 C) 4.8 × 10 - 4 D) 2.1 × 10 - 5 Answer: C Diff: 0 Type: MC 5) If an operatic aria lasts for 5.75 min, its length expressed in seconds is x s, where x is 5) A) less than 5.75. B) greater than 5.75. Answer: B Diff: 0 Type: MC 6) The wavelength of a certain laser is 0.35 micrometers, where 1 micrometer = 1 × 10 - 6 m. Express this wavelength in nanometers. 6) A) 3.5 × 10 4 nm B) 3.5 × 10 1 nm C) 3.5 × 10 2 nm D) 3.5 × 10 3 nm Answer: C Diff: 0 Type: MC 7) Estimate the number of pennies that would fit in a box one foot long by one foot wide by one foot tall. 7) A) 5 x 10 6 B) 5 × 10 5 C) 5 × 10 3 D) 5 × 10 2 E) 5 × 10 4 Answer: E Diff: 0 Type: MC 1

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    8) The period of a pendulum is the time it takes the pendulum to swing back and forth once. If the only dimensional quantities that the period depends on are the acceleration of gravity, g , and the length of the pendulum, G , what combination of g and G must the period be proportional to? (Acceleration has SI units of m · s - 2 .). 8) A) g / G B) g G 2 C) g G D) G / g E) g G Answer: D Diff: 0 Type: MC 9) The shortest wavelength of visible light is approximately 400 nm. Express this wavelength in centimeters. 9) A) 4 × 10 - 11 cm B) 400 × 10 - 11 cm C) 4 × 10 - 7 cm D) 4 × 10 - 5 cm E) 4 × 10 - 9 cm Answer: D Diff: 0 Type: MC 10) What is the difference between 103.5 and 102.24 written with the correct number of significant figures? 10) A) 1 B) 1.3 C) 1.26 D) 1.260 E) 1.2600 Answer: B Diff: 0 Type: MC 11) Estimate the number of times the earth will rotate on its axis during a human's lifetime. 11) A) 3 × 10 4 B) 3 × 10 5 C) 3 × 10 6 D) 3 x 10 8 E) 3 × 10 7 Answer: A Diff: 0 Type: MC 12) The exhaust fan on a typical kitchen stove pulls 600 CFM (cubic feet per minute) through the filter. Given that 1.00 in. = 2.54 cm, how many cubic meters per second does this fan pull? 12) A) 32.8 m 3 /sec B) 3.05 m 3 /sec C) 0.283 m 3 /sec D) 0.328 m 3 /sec Answer: C Diff: 0 Type: MC 13) What is 34 + ( 3 ) × (1.2465) written with the correct number of significant figures? 13) A) 37.74 B) 37.7 C) 38 D) 4 × 10 1 E) 37.7395 Answer: C Diff: 0 Type: MC 14) Convert 1.2 × 10 - 3 to decimal notation. 14) A) 1.200 B) 0.1200 C) 0.0120 D) 0.0012 E) 0.00012 Answer: D Diff: 0 Type: MC 2

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    15) Convert a speed of 4.50 km/h to units of ft/min. (1.00 m = 3.28 ft) 15) A) 246 ft/min B) 82.3 ft/min C) 0.246 ft/min D) 165 ft/min E) 886 ft/min Answer: A Diff: 0 Type: MC 16) Write out the number 7.35 × 10 - 5 in full with a decimal point and correct number of zeros. 16) A) 0.00000735 B) 0.0000735 C) 0.000735 D) 0.00735 E) 0.0735 Answer: B Diff: 0 Type: MC 17) A certain CD - ROM disk can store approximately 6.0 × 10 2 megabytes of information, where 10 6 bytes = 1 megabyte. If an average word requires 9.0 bytes of storage, how many words can be stored on one disk? 17) A) 2.0 × 10 9 words B) 6.7 × 10 7 words C) 2.1 × 10 7 words D) 5.4 × 10 9 words Answer: B Diff: 0 Type: MC 18) When determining the number of significant figures in a number, zeroes to the left of the decimal point are never counted. 18) A) True B) False Answer: B Diff: 0 Type: MC 19) A marathon is 26 mi and 385 yd long. Estimate how many strides would be required to run a marathon. Assume a reasonable value for the average number of feet/stride. 19) A) 4.5 × 10 5 strides B) 4.5 × 10 3 strides C) 4.5 × 10 6 strides D) 4.5 × 10 4 strides Answer: D Diff: 0 Type: MC 20) The position x , in meters, of an object is given by the equation x = A + Bt + Ct 2 , where t represents time in seconds. What are the SI units of A , B , and C ? 20) A) m, s, s 2 B) m/s, m/s 2 , m/s 3 C) m, s, s D) m, m/s, m/s 2 E) m, m, m Answer: E Diff: 0 Type: MC 3

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    21) What is the sum of 1.53 + 2.786 + 3.3 written with the correct number of significant figures? 21) A) 8 B) 7.6 C) 7.62 D) 7.616 E) 7.6160 Answer: B Diff: 0 Type: MC SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 22) Albert uses as his unit of length (for walking to visit his neighbors or plowing his fields) the albert (A), the distance Albert can throw a small rock. One albert is 92 meters. How many square alberts is equal to one acre? (1 acre = 43,560 ft 2 = 4050 m 2 ) 22) Answer: 1.29 A 2 Diff: 0 Type: SA MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 23) If a woman weighs 125 lb, her mass expressed in kilograms is x kg, where x is 23) A) greater than 125. B) less than 125. Answer: B Diff: 0 Type: MC 24) In addition to 1 m = 39.37 in., the following exact conversion equivalents are given: 1 mile = 5280 ft , 1 ft = 12 in , 1 hour = 60 min, and 1 min = 60 s. If a particle has a velocity of 8.4 miles per hour,its velocity, in m/s, is closest to 24) A) 3.0 m/s. B) 4.5 m/s. C) 4.1 m/s. D) 3.4 m/s. E) 3.8 m/s. Answer: E Diff: 0 Type: MC 25) If a flower is 6.5 cm wide, its width expressed in millimeters is x mm, where x is 25) A) greater than 6.5. B) less than 6.5. Answer: A Diff: 0 Type: MC 26) If a tree is 15 m tall, its height expressed in feet is x ft, where x is 26) A) greater than 15. B) less than 15. Answer: A Diff: 0 Type: MC 27) Add 3685 g and 66.8 kg and express your answer in milligrams (mg). 27) A) 7.05 × 10 6 mg B) 7.05 × 10 7 mg C) 7.05 × 10 5 mg D) 7.05 × 10 4 mg Answer: B Diff: 0 Type: MC 28) The number 0.003010 has 28) A) 7 significant figures. B) 6 significant figures. C) 4 significant figures. D) 2 significant figures. Answer: C Diff: 0 Type: MC 4

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    29) What is the result of 1.58 ÷ 3.793 written with the correct number of significant figures? 29) A) 4.2 × 10 - 1 B) 4.1656 × 10 - 1 C) 4 × 10 - 1 D) 4.17 × 10 - 1 E) 4.166 × 10 - 1 Answer: D Diff: 0 Type: MC 30) The current definition of the standard meter of length is based on 30) A) the length of a particular object kept in France. B) the distance traveled by light in a vacuum. C) the distance between the earth and the sun. D) the distance between the earth's equator and north pole. Answer: B Diff: 0 Type: MC 31) What is 56 + ( 32.00 ) /(1.2465 + 3.45) written with the correct number of significant figures? 31) A) 62.8 B) 62.812 C) 62.8123846 D) 62.81 E) 63 Answer: E Diff: 0 Type: MC 32) The height of the ceiling in a typical home, apartment, or dorm room is closest to 32) A) 100 cm. B) 200 cm. C) 400 cm. D) 500 cm. Answer: B Diff: 0 Type: MC 33) 0.0001776 can also be expressed as 33) A) 1.776 × 10 - 3 . B) 1.776 × 10 - 4 . C) 17.72 × 10 4 . D) 1772 × 10 5 . E) 177.2 × 10 7 . Answer: B Diff: 0 Type: MC 34) The speed of a wave pulse on a string depends on the tension, F , in the string and the mass per unit length, μ , of the string. Tension has SI units of kg · m · s - 2 and the mass per unit length has SI units of kg · m - 1 . What combination of F and μ must the speed of the wave be proportional to? 34) A) μ / F B) F / μ C) F / μ D) μF E) μ / F Answer: B Diff: 0 Type: MC 5

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    35) Scientists use the metric system chiefly because it is more accurate than the English system. 35) A) True B) False Answer: B Diff: 0 Type: MC 36) The following exact conversion equivalents are given: 1 m = 100 cm , 1 in = 2.54 cm, and 1 ft = 12 in. If a computer screen has an area of 1.27 ft 2 , this area is closest to 36) A) 0.00284 m 2 . B) 4.65 m 2 . C) 0.118 m 2 . D) 0.284 m 2 . E) 0.0465 m 2 . Answer: C Diff: 0 Type: MC 37) What is the value of Δ (8.104) 2 , written with the correct number of significant figures? 37) A) 206.324 B) 206.323 C) 206.3 D) 206 E) 200 Answer: C Diff: 0 Type: MC 38) A plot of land contains 5.8 acres. How many square meters does it contain? [1 acre = 43,560 ft 2 ] 38) A) 2.3 × 10 4 m 2 B) 5.0 × 10 4 m 2 C) 7.1 × 10 3 m 2 D) 7.0 × 10 4 m 2 Answer: A Diff: 0 Type: MC 39) Approximately how many times does an average human heart beat in a year? 39) A) 4 × 10 7 B) 4 × 10 9 C) 4 × 10 8 D) 4 × 10 6 E) 4 × 10 5 Answer: A Diff: 0 Type: MC 40) A person on a diet loses 1.6 kg in a week. How many micrograms/second ( μ g/s) are lost? 40) A) 44 μ g/s B) 1.6 × 10 5 μ g/s C) 2.6 × 10 3 μ g/s D) 6.4 × 10 4 μ g/s Answer: C Diff: 0 Type: MC 41) 0.00325 × 10 - 8 cm can also be expressed in mm as 41) A) 3.25 × 10 - 12 mm. B) 3.25 × 10 - 11 mm. C) 3.25 × 10 - 10 mm. D) 3.25 × 10 - 9 mm. E) 3.25 × 10 - 8 mm. Answer: C Diff: 0 Type: MC 6

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    42) The current definition of the standard kilogram of mass is based on 42) A) the mass a particular object kept in France. B) the mass of the sun. C) the mass of a cesium-133 atom. D) the mass of the earth. Answer: A Diff: 0 Type: MC 43) When adding two numbers, the number of significant figures in the sum is equal to the number of significant figures in the least accurate of the numbers being added. 43) A) True B) False Answer: B Diff: 0 Type: MC 44) The length and width of a rectangle are 1.125 m and 0.606 m, respectively. Multiplying, your calculator gives the product as 0.68175. Rounding properly to the correct number of significant figures, the area should be written as 44) A) 0.7 m 2 . B) 0.68 m 2 . C) 0.682 m 2 . D) 0.6818 m 2 . E) 0.68175 m 2 . Answer: C Diff: 0 Type: MC 45) What is the product of 11.24 and 1.95 written with the correct number of significant figures? 45) A) 22 B) 21.9 C) 21.92 D) 21.918 E) 21.9180 Answer: B Diff: 0 Type: MC 46) How many nanoseconds does it take for a computer to perform one calculation if it performs 6.7 × 10 7 calculations per second? 46) A) 11 ns B) 67 ns C) 15 ns D) 65 ns Answer: C Diff: 0 Type: MC 47) Approximately how many times does an average human heart beat in a lifetime? 47) A) 3 × 10 9 B) 3 × 10 8 C) 3 × 10 10 D) 3 × 10 7 E) 3 × 10 11 Answer: A Diff: 0 Type: MC 48) A weight lifter can bench press 171 kg. How many milligrams (mg) is this? 48) A) 1.71 × 10 8 mg B) 1.71 × 10 9 mg C) 1.71 × 10 7 mg D) 1.71 × 10 6 mg Answer: A Diff: 0 Type: MC 7

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    49) The mass of a typical adult woman is closest to 49) A) 75 kg. B) 20 kg. C) 35 kg. D) 150 kg. Answer: A Diff: 0 Type: MC 50) The current definition of the standard second of time is based on 50) A) the oscillation of a particular pendulum kept in France. B) the earth's rotation rate. C) the duration of one year. D) the frequency of radiation emitted by cesium atoms. Answer: D Diff: 0 Type: MC 51) What is 0.205 2/3 , expressed to the proper number of significant figures? 51) A) 0.348 B) 0.3477 C) 0.3 D) 0.35 Answer: A Diff: 0 Type: MC 52) What is the sum of 1123 and 10.3 written with the correct number of significant figures? 52) A) 1133 B) 1133.3 C) 1133.3000 D) 1.13 × 10 3 E) 1.1 × 10 3 Answer: A Diff: 0 Type: MC 8

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    Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) An airplane increases its speed at the average rate of 15 m/s 2 . How much time does it take to increase its speed from 100 m/s to 160 m/s? 1) A) 0.25 s B) 17 s C) 0.058 s D) 4.0 s Answer: D Diff: 0 Type: MC 2) Consider a deer that runs from point A to point B. The distance the deer runs can be greater than the magnitude of its displacement, but the magnitude of the displacement can never be greater than the distance it runs. 2) A) True B) False Answer: A Diff: 0 Type: MC 3) An object is moving with constant non - zero acceleration in the + x direction. The position versus time graph of this object is 3) 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. Answer: D Diff: 0 Type: MC 4) A rock is projected upward from the surface of the Moon, at time t = 0 s, with an upward velocity of 30.0 m/s. The acceleration due to gravity at the surface of the Moon is 1.62 m/s 2 , and the Moon has no atmosphere. The height of the rock when it is descending with a speed of 20.0 m/s is closest to 4) A) 145 m. B) 115 m. C) 135 m. D) 125 m. E) 154 m. Answer: E Diff: 0 Type: MC 5) A baseball is hit with a bat and, as a result, its direction is completely reversed and its speed is doubled. If the actual contact with the bat lasts 0.45 s, what is the ratio of the magnitude of the average acceleration of the ball to its original speed? 5) A) 2.2 s - 1 B) 0.15 s - 1 C) 6.7 s - 1 D) 4.4 s - 1 Answer: C Diff: 0 Type: MC 6) A 10 - kg rock and 20 - kg rock are dropped from the same height and experience no significant air resistance. If it takes the 20 - kg rock a time T to reach the ground, what time will it take the 10 - kg rock to reach the ground? 6) A) 4 T B) T /2 C) T /4 D) 2 T E) T Answer: E Diff: 0 Type: MC 1

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    7) A car starting from rest accelerates at a constant 2.0 m/s 2 for 10 s. It then travels with constant speed it has achieved for another 10 s. Then it finally slows to a stop with constant acceleration of magnitude 2.0 m/s 2 . How far does it travel after starting? 7) A) 300 m B) 500 m C) 400 m D) 200 m Answer: C Diff: 0 Type: MC 8) Abby throws a ball straight up and times it. She sees that the ball goes by the top of a flagpole after 0.50 s and reaches the level of the top of the pole after a total elapsed time of 4.1 s. What was the speed of the ball at launch? Neglect air resistance. 8) A) 23 m/s B) 34 m/s C) 11 m/s D) 48 m/s E) 45 m/s Answer: A Diff: 0 Type: MC 9) A car increases its forward velocity uniformly from 40 m/s to 80 m/s while traveling a distance of 200 m. What is its acceleration during this time? 9) A) 9.6 m/s 2 B) 24 m/s 2 C) 12 m/s 2 D) 8.0 m/s 2 Answer: C Diff: 0 Type: MC SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 10) A foul ball is hit straight up into the air with a speed of 30 m/s, and air resistance is negligible. (a) Calculate the time required for the ball to rise to its maximum height. (b) Calculate the maximum height reached by the ball above the point where it hit the bat. (c) Determine the times at which the ball passes a point 25 m above the point where it was hit by the bat. (d) Explain why there are two answers to part (c). 10) Answer: (a) 3.1 s (b) 46 m (c) 1.0 s and 5.1 s (d) One value for the ball traveling upward; one value for the ball traveling downward. Diff: 0 Type: SA MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 11) If the acceleration of an object is zero, then that object cannot be moving. 11) A) True B) False Answer: B Diff: 0 Type: MC 12) A bullet shot straight up returns to its starting point in 10 s. What is the initial speed of the bullet, assuming negligible air resistance? 12) A) 49 m/s B) 9.8 m/s C) 98 m/s D) 25 m/s Answer: A Diff: 0 Type: MC 2

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    13) A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this trip? 13) A) 84 km/h B) 91 km/h C) 90 km/h D) 89 km/h Answer: D Diff: 0 Type: MC 14) What must be your average speed in order to travel 350 km in 5.15 h? 14) A) 68.0 km/h B) 67.0 km/h C) 69.0 km/h D) 66.0 km/h Answer: A Diff: 0 Type: MC 15) Suppose a ball is thrown straight up and experiences no appreciable air resistance. What is its acceleration just before it reaches its highest point? 15) A) slightly greater than g B) slightly less than g C) zero D) exactly g Answer: D Diff: 0 Type: MC 16) An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the trip? 16) A) 275 mi/h B) 270 mi/h C) 260 mi/h D) 280 mi/h Answer: B Diff: 0 Type: MC 17) A toy rocket is launched vertically from ground level at time t = 0.00 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 81 m and acquired an upward velocity of 40 m/s. The rocket continues to rise with insignificant air resistance in unpowered flight, reaches maximum height, and falls back to the ground. The upward acceleration of the rocket during the burn phase is closest to 17) A) 9.9 m/ s 2 . B) 9.6 m/ s 2 . C) 9.0 m/ s 2 . D) 9.3 m/ s 2 . E) 8.7 m/ s 2 . Answer: A Diff: 0 Type: MC 18) A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, and then 1.0 km north to return to its starting point. This trip takes 45 min. What was the bear's average velocity? 18) A) 4.0 km/h B) 0.067 km/h C) 0.00 km/h D) 5.3 km/h Answer: C Diff: 0 Type: MC SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 19) If a car accelerates at a uniform 4.0 m/s 2 , how long will it take to reach a speed of 80 km/hr, starting from rest? 19) Answer: 5.6 s Diff: 0 Type: SA 3

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    MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 20) A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What was the average speed of the runner in m/s? 20) A) 14.2 m/s B) 3.95 m/s C) 14,200 m/s D) 124 m/s Answer: B Diff: 0 Type: MC 21) To determine the height of a flagpole, Abby throws a ball straight up and times it. She sees that the ball goes by the top of the pole after 0.50 s and then reaches the top of the pole again after a total elapsed time of 4.1 s. How high is the pole above the point where the ball was launched? Neglect air resistance. 21) A) 16 m B) 18 m C) 13 m D) 26 m E) 10 m Answer: E Diff: 0 Type: MC SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 22) The graph in the figure represents the velocity of a particle as it travels along the x - axis. What is the average acceleration of the particle between t = 2.0 s and t = 4.0 s? 22) Answer: 1.5 m/s 2 Diff: 0 Type: SA MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 23) A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 ms. What is the average acceleration of the ball during the collision with the wall? 23) A) 0 m/s 2 B) 1500 m/s 2 C) 200 m/s 2 D) 2800 m/s 2 E) 1300 m/s 2 Answer: D Diff: 0 Type: MC 24) A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m. She completes one lap in 100 seconds. What is her average speed? 24) A) 10 m/s B) 1.3 m/s C) 0 m/s D) 5.0 m/s E) 2.5 m/s Answer: D Diff: 0 Type: MC 4

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    25) If the velocity of an object is zero, then that object cannot be accelerating. 25) A) True B) False Answer: B Diff: 0 Type: MC 26) A car is moving with a constant acceleration. At time t = 5.0 s its velocity is 8.0 m/s in the forward direction, and at time t = 8.0 s its velocity is 12.0 m/s forward. What is the distance traveled in that interval of time? 26) A) 20 m B) 30 m C) 50 m D) 40 m E) 10 m Answer: B Diff: 0 Type: MC 27) A jet plane is launched from a catapult on an aircraft carrier. In 2.0 s it reaches a speed of 42 m/s at the end of the catapult. Assuming the acceleration is constant, how far did it travel during those 2.0 s? 27) A) 84 m B) 16 m C) 24 m D) 42 m Answer: D Diff: 0 Type: MC 28) If the velocity versus time graph of an object is a straight line making an angle of + 30° (counter clockwise) with the time axis, the object is 28) A) moving with constant non - zero speed. B) moving with constant non - zero acceleration. C) at rest. D) moving with increasing acceleration. Answer: B Diff: 0 Type: MC 29) A car travels at 15 m/s for 10 s. It then speeds up with a constant acceleration of 2.0 m/s 2 for 15 s. At the end of this time, what is its velocity? 29) A) 375 m/s B) 30 m/s C) 15 m/s D) 45 m/s Answer: D Diff: 0 Type: MC 30) A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Which of the following statements about the direction of the velocity and acceleration of the ball as it is going up is correct? 30) A) Its velocity points downward and its acceleration points upward. B) Its velocity points upward and its acceleration points downward. C) Both its velocity and its acceleration points downward. D) Both its velocity and its acceleration point upward. Answer: B Diff: 0 Type: MC 5

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    31) Car A is traveling at 22.0 m/s and car B at 29.0 m/s. Car A is 300 m behind car B when the driver of car A accelerates his car with a uniform forward acceleration of 2.40 m/ s 2 . How long after car A begins to accelerate does it take car A to overtake car B? 31) A) 5.50 s B) 316 s C) 12.6 s D) 19.0 s E) Car A never overtakes car B. Answer: D Diff: 3 Type: MC 32) An airplane needs to reach a forward velocity of 203.0 km/h to take off. On a 2000 - m runway, what is the minimum uniform acceleration necessary for the plane to take flight if it starts from rest? 32) A) 1.0 m/s 2 B) 0.79 m/s 2 C) 0.87 m/s 2 D) 0.95 m/s 2 Answer: B Diff: 0 Type: MC SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 33) A soccer ball is released from rest at the top of a grassy incline. After 6.4 seconds the ball has rolled 91 m with constant acceleration, and 1.0 s later it reaches the bottom of the incline. (a) What was the ball's acceleration? (b) How long was the incline? 33) Answer: *a) 4.4 m/ s 2 (b) 120 m Diff: 0 Type: SA MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 34) The figure shows a graph of the position x of two cars, C and D, as a function of time t . According to this graph, which statements about these cars must be true? (There could be more than one correct choice.) 34) A) Both cars have the same acceleration. B) At time t = 10 s, both cars have the same velocity. C) The magnitude of the acceleration of car C is less than the magnitude of the acceleration of car D. D) The cars meet at time t = 10 s. E) The magnitude of the acceleration of car C is greater than the magnitude of the acceleration of car D. Answer: A, D Diff: 0 Type: MC 6

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    35) Which of the following graphs represent an object at rest? (There could be more than one correct choice.) 35) A) graph a B) graph b C) graph c D) graph d E) graph e Answer: A Diff: 0 Type: MC 36) A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trip? 36) A) 90 km/h B) 88 km/h C) 92 km/h D) 85 km/h Answer: B Diff: 0 Type: MC SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 37) A car with good tires on a dry road can decelerate (slow down) at a steady rate of about 5.0 m/s 2 when braking. If a car is initially traveling at 55 mi/h (a) how much time does it take the car to stop? (b) what is its stopping distance? 37) Answer: (a) 4.9 s (b) 60 m Diff: 0 Type: SA 7

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