Squids are aquatic creatures that use jet propulsion for motion. Taking up water in their main cavity, they eject it out of a siphon, which can be oriented in many different directions.5 A 0.20-kg squid has a cavity that holds 68 mL of water. When the squid needs to move, the cavity volume decreases by 40% and the expelled water allows the squid to attain a maximum velocity of 1.25 m/s. Assume that the squid shoots water out of its siphon at 6.7 g/s at a velocity of 3.8 m/s. What is the magnitude of the external force that would be required to keep the squid from accelerating?
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