# HW 3 - chun(dc25434 HW03 markert(58840 This print-out...

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chun (dc25434) – HW03 – markert – (58840) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 (part 1 oF 2) 10.0 points Asup e rh e ro± i e s241mF romth etopo Fa tall building at an angle oF 30 below the horizontal. Draw the vectors to scale on a graph to determine the answer. a) What is the horizontal component oF the superhero’s displacement? Correct answer: 208 . 712 m. 208 . 712 m - 120 . 5m 241 m Scale: 100 m - 30 Basic Concept: Δ x = d (cos θ ) Given: d =241m θ = - 30 Solution: Δ x =(241m)[cos( - 30 )] = 208 . 712 m . 002 (part 2 oF 2) 10.0 points b) What is the vertical component oF the su- perhero’s displacement? Correct answer: - 120 . 5m. Explanation: Basic Concept: Δ y = d (sin θ ) Solution: Δ y =(241m)[s in( - 30 )] = - 120 . 5m . 003 10.0 points Consider the vectors ± A and ± B . ± A ± B Which sketch shows the vector ± A -

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chun (dc25434) – HW03 – markert – (58840) 2 7. 8. Explanation: ± A - ± B ± A - ± B 004 10.0 points Acartrave ls1 . 06 km in the x -direction, then turns left 48 . 8 to the original direction and travels an additional distance of 4 . 28 km. Calculate the x component of the car’s net displacement. Correct answer: 3 . 87919 km. Explanation: The x component of the car’s net displace- ment is simply (1 . 06 km)(cos 0 )+(4 . 28 km)(cos 48 . 8 )=3 . 87919 km . 005 (part 1 of 2) 10.0 points Ask iersquatslowandracesdowna(n)16 ski slope. During a 2 s interval, the skier accelerates at 2 . 0m / s 2 . a) What is the horizontal component of the skier’s acceleration (perpendicular to the direction of free fall)? Correct answer: 1 . 92252 m / s 2 . Explanation: a y a x 2m / s 2 - 16 Note: Figure is not drawn to scale. Basic Concept: a x = a (cos θ ) Given: θ = - 16 a =2 . 0m / s 2 Solution: a x =(2m / s 2 )[cos( - 16 )] =1 . 92252 m / s 2 006 (part 2 of 2) 10.0 points b) What is the vertical component of the skier’s acceleration? Correct answer: - 0 . 551275 m / s 2
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## This note was uploaded on 09/13/2011 for the course PHYSICS 302K taught by Professor Irenepolycarpou during the Spring '09 term at University of Texas.

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HW 3 - chun(dc25434 HW03 markert(58840 This print-out...

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