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Quiz 11 Report 12/4/2020

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Quiz 11 Report 12/4/2020

1. Summary

Total number of students 10

Attended 8

Missed 2

Average grade 8.88

Standard deviation of grades 1.25

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2 2. Comments

• Some of student calculated wrong Reynold number

• One student confused the unit between ‘mm’ and ‘cm’ when he tried to find the drag coefficient, so used wrong drag coefficient.

• Some of student made mistake when they interpolate the drag coefficient to find the angle of cone

• One student could not derive the moment for each part separately, so calculated wrong answer

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 Some of students could not derive the momentum equation correctly so they put wrong sign for the term

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• One student used wrong surface area to calculate Drag force. • One student did not consider ‘Cd’ to calculate

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• Some of students could not derive the frequency of drag coefficient correctly, so calculate

 Many student made mistake for