USE THE STATEMENT AND FIGURE BELOW TO ANSWER THE NEXT FOUR QUESTIONS (21 through

Question

USE THE STATEMENT AND FIGURE BELOW TO ANSWER THE NEXT FOUR QUESTIONS (21 through 24). A rocket drifts sideways in outer space from point "a" to point "b as shown bis turned on rocket is subject to no outside forces. Starting at position "b", the and produces a constant thrust (force on the rocket) at right angles to the line "ab". The constant thrust is maintained until the rocket reaches a point "e roc ket's engine is turned on 21. Which path below best represents the path of the rock et between points '"b" ande ints "b" and "c"? O C 22. As the rocket moves from position "b" to position "e", its speed is: (A) constant. (B) continuously increasing (C) continuously decreasing (D) increasing for a while and constant thereafter. (E) constant for a while and decreasing thereafter. 23. At point "c" the rocket's engine is turned off and the thrust immediately drops to zero. Which of the paths below will the rocket follow beyond point "c"? 24. Beyond position "c" the speed of the rocket is: (A) constant. (B) continuously increasing. (C) continuously decreasing. (D) increasing for a while and constant thereafter. (E) constant for a while and decreasing thereafter.

Explanation / Answer

21) B and C describe straight paths which indicate uniform motion over time, but a constant thrust is maintained. A describes a slowing down in the vertical direction, or a speeding up in the horizontal direction, and neither scenario is true. D and E are identical except that there is a slight delay in acceleration in D, which does not fit the scenario. The correct answer is E.

22) Since between points "b" and "c" the constant force is exerted on the rocket, it moves with constant acceleration. That means its velocity is continuously increasing. The correct answer is B.

23) The motion of the rocket the instant before the thrust is removed will persist (it will not change because there is no longer a force acting on it), which matches the path described in B.

24) Since there in no longer any external force acting on the rocket, its speed will be constant. Hence A.

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