Chapter 02, Problem 068 A salamander of the genus Hydromantes captures prey by l

Question

Chapter 02, Problem 068 A salamander of the genus Hydromantes captures prey by launching its tongue as a projectile: The skeletal part of the tongue is shot forward, unfolding the rest of the tongue, until the outer portion lands on the prey, sticking to it. The figure shows the acceleration magnitude a versus time t for the acceieration phase of the launch in a typical situation. The indicated accelerations are a2 -395m/s2 and a 140m/s2. What is the outward speed of the tongue at the end of the acceleration phase? 0 10 20 30 40 t (ms) Number Units the tolerance is +/-5%

Explanation / Answer

area under the a vs t curve will give us the change in velocity.

change in velocity = (140 x 10 / 2) + (140 x 10) + ((395 - 140)(10/2)) + (395 x 10 / 2)

= 5350 (m/s^2)(ms)

= 5.35 m/s

So vf - vi = 5.35

v - 0 = 5.35

v = 5.35 m/s ....Ans

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