PracticeTestQs_Ex1-2 - Exam Name_ MULTIPLE CHOICE. Choose...

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Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Acceleration is sometimes expressed in multiples of g, where g = 9.8 m/s 2 is the acceleration due to the Earth's gravity. In a car crash, the car's velocity may go from 26 m/s to 0 m/s in 0.15 s. How many g's are experienced, on average, by the driver? A) 13 g B) 22 g C) 18 g D) 23 g 1) 2) A car accelerates from 10.0 m/s to 30 m/s at a rate of 3.0 m/s 2 . How far does it travel while accelerating? A) 80 m B) 133 m C) 226 m D) 399 m 2) Situation 2.1 A rock is projected upward from the surface of the moon, at time t = 0.0 s, with a velocity of 30 m/s. The acceleration due to gravity at the surface of the moon is 1.62 m/s 2 . 3) In Situation 2.1, the time when the rock is ascending at a height of 180 m is closest to: A) 12 s B) 23 s C) 30 s D) 17 s E) 8 s 3) 4) In Situation 2.1, the height of the rock when it is descending with a velocity of 20 m/s is closest to: A) 125 m B) 115 m C) 135 m D) 155 m E) 145 m 4) 5) In Situation 2.1, the average velocity of the rock during the Frst 22.0 s of ±ight is closest to: A) 14 m/s B) 18 m/s C) 12 m/s D) 10 m/s E) 16 m/s 5) 6) Two identical objects, A and B, fall from rest from different heights to the ground. If object B takes twice as long as A to reach the ground, what is the ratio of the heights from which A and B fell? Neglect air resistance. A) 1 : 8 B) 1 : 2 C) 1 : 2 D) 1 : 4 6) 7) A ball is thrown vertically upward and then comes back down. During the ball's ±ight up and down, its velocity and acceleration vectors are . . . A) Frst in the same direction and then in opposite directions. B) Frst in opposite directions and then in the same direction. C) always in the same direction. D) always in opposite directions. 7) 8) A stone is thrown vertically upwards, reaches a highest point, and returns to the ground. When the stone is at the top of its path, its acceleration A) is zero. B) changes direction from upwards to downwards. C) is directed downwards. D) is directed upwards. 8) 1
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9) A hobby rocket reaches a height of 72.3 m and lands 111 m from the launch point. What was the angle of launch? A) 67.4° B) 22.6° C) 69.0° D) - 44.8° 9) 10) Two cars are on a head - on collision course. Just before the crash, one car's speedometer reads 59 km/h and the other one reads 81 km/h. What is the speed of the Frst car relative to the second car? A) 69 km/h B) 27 km/h C) 22 km/h D) 140 km/h 10) 11) You throw a rock horizontally off a cliff with a speed of 20 m/s. After two seconds, the total speed of the rock is roughly A) 20 m/s B) 40 m/s C) 37 m/s D) 28 m/s 11) 12) You walk 55 m to the north, then turn 60° to your right and walk another 45 m. How far are you from where you originally started? A) 87
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PracticeTestQs_Ex1-2 - Exam Name_ MULTIPLE CHOICE. Choose...

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