QUESTION 1 1 points Save Answer For general projectile motion with no air resistance, the vertical component of a projectile's acceleration O continuously increases. O is always zero. O continuously decreases. O first decreases and then increases. O remains a non-zero constant QUESTION 2 1 points Save Answer James and John dive from an overhang into the lake below. James simply drops straight down from the edge. John takes a running start and jumps with an initial horizontal velocity of 25 m/s. If there is no air resistance, when they reach the lake below O the splashdown speed of James must be 9.8 mis larger than that of John. O the splashdown speed of James is larger than that of John. O they will both have the same splashdown speed. O the splashdown speed of John must be 25 m/'s larger than that of James. O the splashdown speed of John is larger than that of James. QUESTION 3 1 points Save Answer A ball is thrown horizontally from the top of a tower at the same instant that a stone is dropped vertically. Which object is traveling faster when it hits the level ground below if neither of them experiences any air resistance? O It is impossible to tell because we do not know their masses. O the stone O the ball O Both are traveling at the same speed. QUESTION 4 1 points Save Answer Three forces, F 1, F 2, and # 3, each of magnitude 70 N, all act on an object as shown in the figure. The magnitude of the resultant force acting on the object is 309 30 O 210 N. O 35 N. O 70 N. O ON. 140 N.QUESTION 5 1 points Save Answer In an air-free chamber, a pebble is thrown horizontally, and at the same instant a second pebble is dropped from the same height. Compare the times of fall of the two pebbles. O The dropped pebble hits first. O The thrown pebble hits first. O They hit at the same time. O We cannot tell without knowing which pebble is heavier. QUESTION 6 1 points Save Answer A player kicks a soccer ball in a high arc toward the opponent's goal. At the highest point in its trajectory O neither the ball's velocity nor its acceleration are zero. O the ball's acceleration points upward. O both the velocity and the acceleration of the soccer ball are zero. O the ball's acceleration is zero but its velocity is not zero. O the ball's velocity points downward. QUESTION 7 1 points Save Answer The magnitude of A is 5.5 m, and this vector lies in the second quadrant and makes an angle of 34 : with the +y-axis. The components of A are closest to: O Ax = -4.6 m, Ay = -3.1 m. O Ax = -4.6 m, Ay = 3.1 m. O Ax = -3.1 m, Ay = 4.6 m. O Ax = 3.1 m, Ay =-4.6 m. O Ax = 4.6 m, Ay= -3.1 m. QUESTION 8 1 points Save Answer A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane will O be directly over the package. O depend on the speed of the plane when the package was released. O be behind the package O be in front of the package. QUESTION 9 1 points Save Answer For general projectile motion with no air resistance, the horizontal component of a projectile's acceleration O continuously decreases. O first decreases and then increases. O continuously increases. O remains a non-zero constant. O is always zeroQUESTION 10 James and John dive from an overhang into the lake below. James simply drops straight down from the edge. John takes a running start and jumps with an initial horizontal velocity of 25 m/s. Compare the time it takes each to reach the lake below if there is no air resistance. O Cannot be determined without knowing the mass of both James and John. O James and John will reach the surface of the lake at the same time. O James reaches the surface of the lake first. O John reaches the surface of the lake first. O Cannot be determined without knowing the weight of both James and John. QUESTION 11 Three vectors, S, 7, and U , have the components shown in the table. What is the magnitude of the resultant of these three vectors? x component | y component 3.50 m -4.50 m 2.00 m 0.00 m -5.50 m 2.50 m O 7.00 m O 13.0 m O 11.1 m O 2.00 m O 5.50 m