   Chapter 6, Problem 25P

Chapter
Section
Textbook Problem

Squids are the fastest marine invertebrates, using a powerful set of muscles to take in and then eject water in a form of jet propulsion that can propel them to speeds of over 11.5 m/s. What speed would a stationary 1.50-kg squid achieve by ejecting 0.100 kg of water (not included in the squid’s mass) at 3.25 m/s? Neglect other forces, including the drag force on the squid.

To determine
Speed of the squid.

Explanation

Given Info: Mass of the squid is ms=1.50kg , mass of the water is mw=0.100kg , velocity of water is vw=3.25m/s and the initial velocity of squid water system is vsand vw=0 .

Apply conservation of momentum to squid- water system

(msvs+mwvw)f=(msvs+mwvw)i (1)

• ms is the mass of the squid.
• mw is the mass of the water.
• vw is the velocity of water.
• vs is the velocity of squid.

Use the initial velocity is zero in equation (1) and solve for vs

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