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Question
Squids have been reported to jump from the ocean and travel 30.0 m (measured horizontally) before re-entering the water. (a) Calculate the initial speed of the squid if it leaves the water at an angle of $20.0^\circ$ , assuming negligible lift from the air and negligible air resistance. (b) The squid propels itself by squirting water. What fraction of its mass would it have to eject in order to achieve the speed found in the previous part? The water is ejected at 12.0 m/s ; gravitational force and friction are neglected. (c) What is unreasonable about the results? (d) Which premise is unreasonable, or which premises are inconsistent?
Question by OpenStax is licensed under CC BY 4.0.
Final Answer
  1. $21.4 \textrm{ m/s}$
  2. $0.832$
  3. It is unreasonable to assume the squid can expel 83% of its mass.
  4. The 30.0 m range is unreasonable.
Solution Video

OpenStax College Physics Solution, Chapter 8, Problem 62 (Problems & Exercises) (5:09)

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