280_Dynamics 11ed Manual

280_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Unformatted text preview: Engineering Mechanics - Dynamics Chapter 14 v2 τ 1 = 0 , 0.01 t1 .. t1 P1 (τ 1) = F1 τ 2 = t1 , 1.01 t1 .. t2 Solution: P2 (τ 2) = F1⎜ t2 τ1 1 kW ⎛ τ 2 − t2 ⎞ v2 1 ⎟ τ2 ⎝ t1 − t2 ⎠ t2 kW Power Power in kW 15 10 () 5 P2( τ 2) P1 τ 1 0 5 0 0.05 0.1 0.15 0.2 τ 1, τ 2 Time in s t2 ⎛⌠t1 ⎞ ⎜⎮ P ( τ ) dτ + ⌠ P ( τ ) dτ⎟ kW U= ⎮ 2 ⎜⌡0 1 ⎟ ⌡t 1 ⎝ ⎠ Problem 14-63 An athlete pushes against an exercise machine with a force that varies with time as shown in the first graph. Also, the velocity of the athlete’s arm acting in the same direction as the force varies with time as shown in the second graph. Determine the maximum power developed during the time period 0 < t < t2. Given: F 1 = 800 N v2 = 20 m s t1 = 0.2 s t2 = 0.3 s 278 U = 1.689 kJ 0.25 ...
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This note was uploaded on 08/16/2011 for the course EGN 3321 taught by Professor Christianfeldt during the Spring '08 term at University of Central Florida.

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