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# HW1 - Niu(qn269 HW01 Tsoi(58020 This print-out should have...

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Niu (qn269) – HW01 – Tsoi – (58020) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Highway safety engineers build soft barriers so that cars hitting them will slow down at a safe rate. A person wearing a safety belt can withstand an acceleration of 300 m / s 2 . How thick should barriers be to safely stop a car that hits the barriers at 86 km / h? Answer in units of m. 002 (part 1 of 3) 10.0 points Consider the velocity curve of a one dimen- sional motion along the x -axis. The initial position is x = 10 m. The scale on the horizontal axis is 2 s per division and on the vertical axis 2 m/s per division. a b c time × (2 s) per division velocity × (2 m/s) per division The position at t = 4 s is given by 1. x = 30 m 2. x = 14 m 3. x = 18 m 4. x = 10 m 5. x = 24 m 6. x = 22 m 7. x = 12 m 8. x = 16 m 9. x = 28 m 10. x = 20 m 003 (part 2 of 3) 10.0 points The average velocity v between 0 s and 6 s is given by 1. 5 m / s < v 6 m / s 2. 1 m / s < v 2 m / s 3. 8 m / s < v 9 m / s 4. 7 m / s < v 8 m / s 5. 3 m / s < v 4 m / s 6. 4 m / s < v 5 m / s 7. 6 m / s < v 7 m / s 8. 9 m / s < v 10 m / s 9. 2 m / s < v 3 m / s 10. 0 m / s < v 1 m / s 004 (part 3 of 3) 10.0 points The average acceleration a between 14 s and 16 s is given by 1. 0 m / s 2 < a 1 m / s 2 2. - 3 m / s 2 < a ≤ - 2 m / s 2 3. 3 m / s 2 < a 4 m / s 2 4. - 5 m / s 2 < a ≤ - 4 m / s 2 5. - 2 m / s 2 < a ≤ - 1 m / s 2 6. 1 m / s 2 < a 2 m / s 2

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Niu (qn269) – HW01 – Tsoi – (58020) 2 7. - 1 m / s 2 < a 0 m / s 2 8.
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