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Unformatted text preview: yoon (jy4326) HW03 markert (58840) 1 This printout should have 21 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 2) 10.0 points A superhero flies 178 m from the top of a tall building at an angle of 19 below the horizontal. Draw the vectors to scale on a graph to determine the answer. a) What is the horizontal component of the superheros displacement? Correct answer: 168 . 302 m. Explanation: 168 . 302 m 57 . 9512m 178 m Scale: 100 m 19 Basic Concept: x = d (cos ) Given: d = 178 m = 19 Solution: x = (178 m)[cos( 19 )] = 168 . 302 m . 002 (part 2 of 2) 10.0 points b) What is the vertical component of the su perheros displacement? Correct answer: 57 . 9512 m. Explanation: Basic Concept: y = d (sin ) Solution: y = (178 m)[sin( 19 )] = 57 . 9512 m . 003 10.0 points Consider the vectors vector A and vector B . vector A vector B Which sketch shows the vector vector A vector B to the same scale? 1. 2. correct 3. 4. 5. 6. yoon (jy4326) HW03 markert (58840) 2 7. 8. Explanation: vector A vector B vector A vector B 004 10.0 points A car travels 2 . 39 km in the xdirection, then turns left 73 . 7 to the original direction and travels an additional distance of 2 . 17 km. Calculate the x component of the cars net displacement. Correct answer: 2 . 99905 km. Explanation: The x component of the cars net displace ment is simply (2 . 39 km)(cos 0 )+(2 . 17 km)(cos 73 . 7 ) = 2 . 99905 km . 005 (part 1 of 2) 10.0 points A skier squats low and races down a(n) 10 ski slope. During a 4 s interval, the skier accelerates at 4 . 4 m / s 2 . a) What is the horizontal component of the skiers acceleration (perpendicular to the direction of free fall)? Correct answer: 4 . 33315 m / s 2 . Explanation: a y a x 4 . 4 m / s 2 10 Note: Figure is not drawn to scale. Basic Concept: a x = a (cos ) Given: = 10 a = 4 . 4 m / s 2 Solution: a x = (4 . 4 m / s 2 )[cos( 10 )] = 4 . 33315 m / s 2 006 (part 2 of 2) 10.0 points b) What is the vertical component of the skiers acceleration? Correct answer: . 764052 m / s 2 . Explanation: Basic Concept: a y = a (sin ) Solution: a y = (4 . 4 m / s 2 )[sin( 10 )] = . 764052 m / s 2 007 (part 1 of 2) 10.0 points A descent vehicle landing on the moon has a vertical velocity toward the surface of the moon of 24 . 3 m / s. At the same time, it has a horizontal velocity of 58...
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 Fall '09
 BOCKNACK
 Organic chemistry

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