Homework 4-solutions

# Homework 4-solutions - yindeemark(rry82 – Homework 4 –...

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Unformatted text preview: yindeemark (rry82) – Homework 4 – chelikowsky – (59005) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points Four forces act on an object. F 1 F 4 F 2 F 3 If the object is accelerating to the right, compare the forces. 1. F 1 < F 2 , F 3 < F 4 2. F 1 > F 2 , F 3 < F 4 3. F 1 = F 2 , F 3 < F 4 correct 4. F 1 = F 2 , F 3 > F 4 5. F 1 = F 2 , F 3 = F 4 Explanation: The object is not accelerating up or down, so F 1 = F 2 . The object is accelerating to the right so F 4 is greater than F 3 . 002 (part 2 of 2) 10.0 points If the object is accelerating upward and to the right, compare F 1 to F 2 and F 3 to F 4 . 1. F 1 = F 2 , F 3 > F 4 2. F 1 = F 2 , F 3 < F 4 3. F 1 < F 2 , F 3 < F 4 4. F 1 = F 2 , F 3 = F 4 5. F 1 > F 2 , F 3 < F 4 correct Explanation: F 1 > F 2 causes acceleration upward and F 4 > F 3 causes acceleration to the right. 003 (part 1 of 3) 10.0 points The following 3 questions refer to a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Indicate the force acting on the coin for each of the cases described below. The coin is moving upward after it is re- leased. 1. The force is down and increasing . 2. The force is down and decreasing . 3. The force is up and increasing . 4. The force is zero . 5. The force is down and constant . cor- rect 6. The force is up and constant . 7. The force is up and decreasing . Explanation: The force acting on the coin is gravity. 004 (part 2 of 3) 10.0 points The coin is at its highest point. 1. The force is zero . 2. The force is down and decreasing . 3. The force is down and increasing . 4. The force is down and constant . cor- rect 5. The force is up and decreasing . 6. The force is up and constant . 7. The force is up and increasing . Explanation: The same reason as Part 1. 005 (part 3 of 3) 10.0 points yindeemark (rry82) – Homework 4 – chelikowsky – (59005) 2 The coin is moving downward. 1. The force is up and constant . 2. The force is zero . 3. The force is down and decreasing . 4. The force is down and constant . cor- rect 5. The force is up and decreasing . 6. The force is down and increasing . 7. The force is up and increasing . Explanation: The same reason as Part 1. 006 10.0 points A space probe is carried by a rocket into outer space where it continues to move on its own in a straight line. What keeps the probe moving? 1. Nothing specific; in the absence of forces it would continue moving in a straight line. correct 2. Nothing; the probe will eventually stop....
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Homework 4-solutions - yindeemark(rry82 – Homework 4 –...

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