Quiz_ Quiz 10_ Swimming
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University of British Columbia *
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325
Subject
Aerospace Engineering
Date
Feb 20, 2024
Type
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11
Uploaded by HighnessGoldfinch2540
Quiz 10: Swimming
Started: Nov 29 at 2:02p.m.
Quiz Instructions
This is the tenth quiz out of ten. Your 3 lowest quiz scores will be dropped, and the remaining 7 quizzes
will be worth 1.43% each.
You have 5 days to complete this assignment (Due Date: Monday, December 4 @ 11:00 AM). You will
only be allowed to submit your answers once. The correct answers will be available Monday, December
4 @ 12:00 AM.
1 pts
Question 1
When a sunfish is swimming, which of the following will result in forward longitudinal
acceleration? positive lateral acceleration
negative lateral acceleration
constant lateral velocity
1 pts
Question 2
During jetting locomotion, the animal can generate more thrust likely by increasing the mass of the fluid being pushed back
increasing the velocity of the fluid being pushed back
decreasing the mass of the fluid being pushed back
decreasing the velocity of the fluid being pushed back
1 pts
Question 3
85.4
A strange new animal with 4 rectangular shaped flippers (span = 20cm, chord =
20cm) is not moving in the ocean (
). These flippers are
essentially flat plates (
) with one degree of freedom, hinged where they
meet the body. It begins to move its flippers from head to tail in a downstroke at a
speed of 1.8m/s. What is the thrust generated by one wing? Give your answer in N
rounded to 1 decimal place.
1 pts
Question 4
Continued from Q3. If the animal was already moving forward at a speed of 0.65m/s,
what would is the thrust generated by one wing? Give your answer in N rounded to 1
decimal place.
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34.9
1 pts
Question 5
18.8
Continued from Q4. The animal, still moving forward at a speed of 0.65m/s, is now in
the recovery phase. It's upstroke goes from tail to head along the same path at a
speed of 0.7m/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 of one wing in N rounded to 1
decimal place?
1 pts
Question 6
60
Continued from Q5. Assume your answers for Q4 was that and that
your answer for Q5 was that . If the animal is moving forward at a
constant speed of 0.65m/s, how much drag is it experiencing on its body? Give your
answer in N rounded to the nearest whole number.
1 pts
Question 7
Continued from Q6. Assume your answers for Q4 was that and that
your answer for Q5 was that . If the animal is moving forward at a
speed of 0.65m/s with a , what is the Froude efficiency of this
animal? Give your answer rounded to 2 decimal places.
0.09
1 pts
Question 8
Continued form Q7. What can the animal do to increase efficiency? Rotate the flipper so that its surface is aligned with the flow
Increase flipper porosity
Decrease flipper porosity
Increase power stroke speed
Decrease power stroke speed
Increase feather stroke speed
Decrease feather stroke speed
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1 pts
Question 9
0.63
Continued from Q6. Assume your answer for Q6 was that the animal is experiencing
55N of drag on its body. It's body is a hollow hemisphere (rounded side facing
forward) and therefore has a . What is its projected body area ?
Give your answer in rounded to 2 decimal places. Given the following data, answer Q10-15.
Animal
Power Input (W)
Velocity (m/s)
Body Mass (kg)
Cheetah
101.6
1.81
40
Lion
96.6
1.80
160
Impala
84.8
1.69
55
Zebra
75.2
1.62
300
Use . Give your numerical answers rounded to 2 decimal places. 1 pts
Question 10
0.14
What is the normalized cost of transport for the cheetah? 1 pts
Question 11
0.03
What is normalized cost of transport for the lion? 1 pts
Question 12
0.09
What is the normalized cost of transport for the impala? 1 pts
Question 13
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0.02
What is the normalized cost of transport for the zebra? 1 pts
Question 14
Which animal is the most energetically expensive runner? cheetah
impala
lion
zebra
Quiz saved at 8:56pm
1 pts
Question 15
Cheetahs hunt impalas and lions hunt zebras. Predators have a higher cost of
transport than prey. True
False
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