The velocity and acceleration of an object at a certain instant are i-(3,0 m/s)
ID: 1771793 • Letter: T
Question
The velocity and acceleration of an object at a certain instant are i-(3,0 m/s) a-(0.5m/s)i-(02m/s)1 At this instant, the object is A, speeding up and following a curved path B. speeding up and moving in a straight line. C. slowing down and following a curved path. D. slowing down and moving in a straight line. E. none of these. You drop a ball from rest and simultaneously shoot a second, identical ball horizontally from the same height as the first ball. If there is no air resistance, which ball hits the ground first? 6- A, The dropped ball hits first B. The ball shot horizontally hits first C. They both hit at the same time. D. Answer depends on the speed with which the second ball is shot. E. Answer depends on the speed with which the second ball is shot and the masses of the balls. 7- from an airplane flying at a constant speed in a straight line at a constant altitude. An object is dropped If there is no air resistance, the falling object will (as seen from the ground A, lag behind the airplane, but still move forward. B. lag behind the airplane and fall straight down. C. lag behind the airplane and move backward. o. remain directly under the airplane. E. move ahead of the airplane. 8- A projectile is launched at a 30. angle above the horizontal. Ignore air resistance. The projectile's acceleration is greatest A at a point between the launch point and the high point of the trajectory B. at the high point of the trajectory c at a point between the high point of the trajectory and where it hits the ground D. the acceleration is the same (but nonzero) at all points along the trajectory E. misleading question-the acceleration is zero at all points along the trajectory A roller coaster car moves around a vertical circle. At the bottom of the circle, the car experiences four times as much radial acceleration as at the top of the circle. Compared to its speed at the top of the circle, the speed of the car at the bottom of the circle is 9- A, V2 times as great. B. twice as great c 2 2 times as great D. four times as great. E. 16 times as great.Explanation / Answer
(5) Speeding up and following a curved path.
(6) They both hit the ground at the same time, as their vertical acceleration is same.
(7) Remain directly under the plane, as the plane and object have the same horizontal velocity.
(8) The acceleration is the same and non-zero at all points.
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