# hw1 - This print-out should have 18 questions...

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Unformatted text preview: This print-out should have 18 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Each part of a question is worth 10 points. Download this assignment now, and work on it offline. Then, upload your answers when you are ready. THIS IS DUE BY 11:59 PM on SUNDAY MAY 23. NO LATE HOMEWORK WILL BE ACCEPTED. NOTE THAT THE SYS- TEM WILL BE DOWN FROM 6 PM SAT- URDAY UNTIL 6 PM SUNDAY. I strongly suggest you upload your solutions before 6 PM Saturday to be safe. DO NOT ROUND NUMERICAL VAL- UES when doing calculations. Keep at least 6 significant digits in all values (including val- ues such as pi). Detailed solutions will be available on this site after 11:59 PM on Sunday May 23. 001 10.0 points A surveyor measure the distance across a straight river by the following methods: Start- ing directly across from a tree on the opposite bank, she walks 174 m along the river bank to establish a baseline. Then she sights across to the tree. The angle from her baseline to the tree is 47 . 9 ◦ . How wide is the river? Correct answer: 192 . 57 m. Explanation: Let : AB = 174 m and AC = 47 . 9 ◦ . w 174 m C A B 47 . 9 ◦ tan θ ≡ AB AC AB = AC tan θ = (174 m) tan47 . 9 ◦ = 192 . 57 m . 002 (part 1 of 2) 10.0 points A physics book is moved once around the perimeter of a table of dimensions 1 m by 3 m. If the book ends up at its initial position, what is the magnitude of its displacement? 1. 1 m 2. 4 m 3. 0 m correct 4. 6 m 5. 8 m 6. None of these 7. 2 m 8. 3 m 9. 7 m 10. 5 m Explanation: Since its final position is the same as its initial position, the displacement is 0. 003 (part 2 of 2) 10.0 points What is the distance traveled? 1. 5 m 2. 4 m 3. 0 m 4. 7 m 5. 3 m 6. 1 m 7. None of these 8. 6 m 9. 2 m 10. 8 m correct Explanation: The distance traveled is the perimeter of the table: d = 2 ℓ + 2 w = 2(1 m) + 2(3 m) = 8 m . 004 10.0 points The graph shows the velocity v as a function of time t for an object moving in a straight line. t v t Q t R t S t P Which graph shows the corresponding dis- placement x as a function of time t for the same time interval? 1. t x t Q t R t S t P 2....
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hw1 - This print-out should have 18 questions...

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