Homework 6-solutions

Homework 6-solutions - le(txl65 – Homework 6 – Spurlock...

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Unformatted text preview: le (txl65) – Homework 6 – Spurlock – (11881) 1 This print-out should have 3 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 The force of magnitude F x acting in the x direction on a 4 . 3 kg particle varies in time as shown in the figure. 0 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 F x (N) t (s) Calculate the impulse of this force. Correct answer: 20 N · s. Explanation: The impulse of a time-dependent force F ( t ) is the integral I = integraldisplay F ( t ) dt. Graphically, this integral is the area between the F ( t ) plot and the t axis. Splitting this area into a triangle (for 0 < t < 3 s), a rectangle (for 3 s < t < 5 s) and another triangle (for 5 s < t < 8 s), we find I = (4 N) (3 s) 2 + (4 N) (2 s) + (4 N) (3 s) 2 = 20 N · s . 002 (part 2 of 2) 10.0 points Before the force is applied ( t < on the above graph ), the particle moves along the x axis with velocity v 1 =- 6 . 3 m /...
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This note was uploaded on 04/05/2011 for the course SD ds taught by Professor Sdsd during the Spring '11 term at Tarrant County.

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Homework 6-solutions - le(txl65 – Homework 6 – Spurlock...

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