hw4 - khounvivongsy(sk27799 – Homework 4 – Weathers...

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Unformatted text preview: khounvivongsy (sk27799) – Homework 4 – Weathers – (17104) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points Consider four vectors vector F 1 , vector F 2 , vector F 3 , and vector F 4 , where their magnitudes are F 1 = 41 N, F 2 = 33 N, F 3 = 17 N, and F 4 = 60 N. Let θ 1 = 130 ◦ , θ 2 = − 140 ◦ , θ 3 = 24 ◦ , and θ 4 = − 72 ◦ , measured from the positive x axis with the counter-clockwise angular direction as positive. What is the magnitude of the resultant vec- tor vector F , where vector F = vector F 1 + vector F 2 + vector F 3 + vector F 4 ? Correct answer: 43 . 6427 N. Explanation: Basic Concepts: Vector components fig- ure1 Solution: The x components of the forces vector F 1 , vector F 2 , and vector F 3 are F 1 x = F 1 cos(130 ◦ ) = − 26 . 3543 N F 2 x = F 2 cos( − 140 ◦ ) = − 25 . 2795 N F 3 x = F 3 cos(24 ◦ ) = 15 . 5303 N F 4 x = F 4 cos( − 72 ◦ ) = 18 . 541 N . and the y components are F 1 y = F 1 sin(130 ◦ ) = 31 . 4078 N F 2 y = F 2 sin( − 140 ◦ ) = − 21 . 212 N F 3 y = F 3 sin(24 ◦ ) = 6 . 91453 N F 4 y = F 4 sin( − 72 ◦ ) = − 57 . 0634 N . The x and y components of the resultant vec- tor vector F are F x = F 1 x + F 2 x + F 3 x + F 4 x = ( − 26 . 3543 N) + ( − 25 . 2795 N) + (15 . 5303 N) + (18 . 541 N) = − 17 . 5625 N F y = F 1 y + F 2 y + F 3 y + F 4 y = (31 . 4078 N) + ( − 21 . 212 N) + (6 . 91453 N) + ( − 57 . 0634 N) = − 39 . 953 N Hence the magnitude of the resultant vector bardbl vector F bardbl is bardbl vector F bardbl = radicalBig F 2 x + F 2 y = radicalBig ( − 17 . 5625 N) 2 + ( − 39 . 953 N) 2 = 43 . 6427 N 002 (part 2 of 2) 10.0 points What is the direction of this resultant vector vector F ?...
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This note was uploaded on 02/08/2010 for the course PHYS 1710 taught by Professor Weathers during the Spring '09 term at University of North Carolina Wilmington.

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hw4 - khounvivongsy(sk27799 – Homework 4 – Weathers...

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