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-kg squid (including the water in the cavity) at rest suddenly sees a dangerous predator. (a) if the squid has 1.75 kg of water in its cavity, at what speed must it expel this water suddenly to achieve a speed of 2.50 m/s to escape the predator? ignore any drag effects of the surrounding water. (b) how much kinetic energy does the squid create by this maneuver?

6.78571 m/s

55.13387 Joules

Explanation:

= Velocity of squid = 2.5 m/s

= Velocity of water

= Mass of water = 1.75 kg

Mass of squid

Momentum of squid

As the momentum of the system is conserved

The speed of the water is 6.78571 m/s

Kinetic energy the squid creates is given by

Kinetic energy of the squid + Kinetic energy of water

Kinetic energy the squid creates by this maneuver is 55.13387 Joules

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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