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# HW2a - Version One – Homework 2 – savrasov – 39822...

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Unformatted text preview: Version One – Homework 2 – savrasov – 39822 – Oct 08, 2007 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. Serway CP 03 14 04:01, trigonometry, numeric, > 1 min, nor- mal. 001 (part 1 of 1) 2 points A quarterback takes the ball from the line of scrimmage, runs backward for 10 yards, then runs sideways parallel to the line of scrim- mage for 15 yards. At this point, he throws a 50 yards forward pass straight downfield perpendicular to the line of scrimmage. What is the magnitude of the football’s resultant displacement? Correct answer: 42 . 72 yards. Explanation: Let the x direction be parallel to line of scrimmage. Given : Δ y 1 =- 10 yards , Δ x = ± 15 yards , and Δ y 2 = 50 yards . Δ y tot = Δ y 1 + Δ y 2 =- 10 yards + 50 yards = 40 yards Δ x tot = Δ x = ± 15 yards The displacements are perpendicular, so d = q (Δ x tot ) 2 + (Δ y tot ) 2 = q ( ± 15 yards) 2 + (40 yards) 2 = 42 . 72 yards . keywords: Angled Projectile 02 04:06, trigonometry, numeric, > 1 min, wording-variable....
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HW2a - Version One – Homework 2 – savrasov – 39822...

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