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Squids and octopuses propel themselves by expelling water. They do this by keeping water in a cavity and then suddenly contracting the cavity to force out the water through an opening. $A 6.50-k g$ squid (including the water in the cavity) at rest suddenly sees a dangerous predator. (a) If the squid has 1.75 $\mathrm{kg}$ of water in its cavity, at what speed must it expel this water to suddenly achieve a speed of 2.50 $\mathrm{m} / \mathrm{s}$ to escape the predator? Neglect any drag effects of the surrounding water. (b) How much kinetic energy does the squid create by this maneuver?

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(a) $+6.79 \mathrm{m} / \mathrm{s}$(b) $55.2 \mathrm{J}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Cornell University

University of Washington

McMaster University

Lectures

04:30

In classical mechanics, impulse is the integral of a force, F, over the time interval, t, for which it acts. In the case of a constant force, the resulting change in momentum is equal to the force itself, and the impulse is the change in momentum divided by the time during which the force acts. Impulse applied to an object produces an equivalent force to that of the object's mass multiplied by its velocity. In an inertial reference frame, an object that has no net force on it will continue at a constant velocity forever. In classical mechanics, the change in an object's motion, due to a force applied, is called its acceleration. The SI unit of measure for impulse is the newton second.

03:30

In physics, impulse is the integral of a force, F, over the time interval, t, for which it acts. Given a force, F, applied for a time, t, the resulting change in momentum, p, is equal to the impulse, I. Impulse applied to a mass, m, is also equal to the change in the object's kinetic energy, T, as a result of the force acting on it.

02:45

Squids and octopuses prope…

08:17

04:13

06:23

Animal Propulsion. Squids …

05:34

02:21

Animal propulsion. Squids …

03:52

04:31

We've seen that squid…

02:49

Squids are the fastest mar…

03:32

Squids have been reported …

05:06

Squid use jet propulsion f…

00:58

Squids rely on jet propuls…

00:37

BIO Momentum and the squir…

01:46

Squid rely on jet propulsi…

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