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Feb 20, 2024

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Uploaded by HighnessGoldfinch2540

Practice Quiz 10: Swimming Due Dec 25 at 11:59p.m. Points 15 Questions 15 Available Dec 4 at 12p.m. - Dec 25 at 11:59p.m. Time Limit None Allowed Attempts Unlimited Instructions Copy of Quiz 10

Attempt History Attempt Time Score LATEST Attempt 1 less than 1 minute 0 out of 15 Submitted Dec 9 at 2:12p.m. Take the Quiz Again 0 / 1 pts Question 1 nanswered nanswered For a dolphin swimming with it's tail angled below it's maximum performance (max L/D) angle of attack, how could it increase thrust? Increase amplitude of tail movement orrect Answer orrect Answer

Increase frequency of tail movement orrect Answer orrect Answer Decrease amplitude of tail movement Decrease frequency of tail movement 0 / 1 pts Question 2 nanswered nanswered You perform a PIV experiment on different swimming behaviours of a fish and observe the derive the following vortex pattern from the velocity vectors:

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If the fish goes from behaviour A to behaviour B, what is it likely doing? Hint, the vortex strength is identical in both A and B. Accelerating orrect Answer orrect Answer Decelerating Steady Forward Locomotion

Staying in Place 0 / 1 pts Question 3 nanswered nanswered An airfoil starts moving on the upstroke has the following (rough) streamline pattern. What would you expect the direction of the first vortex shed to be?

Clockwise orrect Answer orrect Answer Counter-clockwise 0 / 1 pts Question 4 nanswered nanswered A reverse von Karman street is formed behind the grey fish. If a second fish were to follow the grey fish, would it be more efficient to position itself where the red fish is or the blue fish is? Note that when you pick an option, there is no third fish involved.

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Blue orrect Answer orrect Answer Red Both are equivalent. 0 / 1 pts Question 5 nanswered nanswered A dead fish oscillating out of phase at it's natural frequency in the von Karman street in the wake of a half cylinder beam will experience thrust. The grey and black arrows are the velocity vectors, with the black vectors showing the max velocity. The blue arrows show the direction of vorticity.

True orrect Answer orrect Answer False 0 / 1 pts Question 6 nanswered nanswered

A dead fish oscillating in phase at it's natural frequency in the von Karman street in the wake of a half cylinder beam will experience thrust. The grey and black arrows are the velocity vectors, with the black vectors showing the max velocity. The blue arrows show the direction of vorticity. True

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False orrect Answer orrect Answer 0 / 1 pts Question 7 nanswered nanswered Based on some PIV experiments, you can observe a sunfish swimming forward at a rate of 10.15cm/s and calculate it is producing a thrust of 11.12mN. How much power does the fish need to output to achieve this? Give your answer in mW rounded to 2 decimal places. ou Answered ou Answered orrect Answers orrect Answers 1.13 (with margin: 0.01)

0 / 1 pts Question 8 nanswered nanswered In the PIV experiment of Q7, a wake velocity of 14.7cm/s was observed. What is the mass of water moved per unit time that resulted in the calculated thrust. Give your answer in kg/s rounded to 2 decimal places. ou Answered ou Answered orrect Answers orrect Answers 0.24 (with margin: 0.01) 0 / 1 pts Question 9 nanswered nanswered Following on Q7&8: If you doubled the mass of water moved per unit time moved in the wake but retained the same forward swimming velocity and wake velocity, what would you expect the thrust force to be?

22.24mN orrect Answer orrect Answer 11.12mN 44.48mN 5.56mN 0 / 1 pts Question 10 nanswered nanswered If the sunfish from Q7&8 now requires a thrust of 24mN to swim forward. It retains the same rate of water mass moved and wake velocity. How fast is it swimming forward? Give your answer in cm/s rounded to 2 decimal places.

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ou Answered ou Answered orrect Answers orrect Answers 4.88 (with margin: 0.01) 0 / 1 pts Question 11 nanswered nanswered Assume that your calculated new speed in Q10 is . How much has your Froude efficiency decreased by compared to the original swimming conditions detailed in Q7? Give your answer in % rounded to the nearest whole number. Hint: will give you the difference. ou Answered ou Answered

orrect Answers orrect Answers 39 (with margin: 1) 0 / 1 pts Question 12 nanswered nanswered A strange new animal with rectangular shaped flippers (span = 30cm, chord = 10cm) is swimming in the ocean ( ) at a speed of 0.81m/s. These flippers are essentially flat plates ( ) with one degree of freedom, hinged where they meet the body. They move from head to tail in a downstroke at a speed of 2m/s. What is the thrust generated by one wing? Give your answer in N rounded to 1 decimal place. ou Answered ou Answered orrect Answers orrect Answers 28 (with margin: 0.1)

0 / 1 pts Question 13 nanswered nanswered He same animal as Q12 is now in the recovery phase. It's upstroke goes from tail to head along the same path at a speed of 0.5m/s. However, on the upstroke, there are structural changes that increase the porosity of the wing without changing it's surface area. It has a new drag coefficient . What is the feather force in N rounded to 1 decimal place? ou Answered ou Answered orrect Answers orrect Answers 13.3 (with margin: 0.1) 0 / 1 pts Question 14 nanswered nanswered

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Assume your answers for Q12 was that and that your answer for Q13 was that . If the animal is moving forward at a speed of 0.81m/s with a , what is the Froude efficiency of this animal? Give your answer rounded to 2 decimal places. ou Answered ou Answered orrect Answers orrect Answers 0.17 (with margin: 0.01) 0 / 1 pts Question 15 nanswered nanswered For the same animal as in Q12, and assuming your answers for Q13 was that and that your answer for Q11 was that , if the animal is moving forward at a constant speed of

0.81m/s, how much drag is it experiencing on its body? Give your answer in N rounded to the nearest whole number. ou Answered ou Answered orrect Answers orrect Answers 30 (with margin: 0)

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