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QUIZ 1 – Report

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Academic year: 2022

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(1)

QUIZ 1 – Report

General

Total number of students 24

Attended 20

Missed 4

Average grade 7.25

Standard deviation of grades 1.48

Grade distribution

Comparison with last five years

(2)

Comments

• No students consider that 𝑑𝑑𝑑𝑑

𝑑𝑑𝑑𝑑

= −

𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑 in the calculation of the shear stress:

• Many students did not calculate 𝜏𝜏 at the wall (at 𝑟𝑟=𝑅𝑅) in part (a) of the problem.

• Few students made mistakes in computing the derivative.

• Few students substitute all the numbers in the formulas for 𝜏𝜏 and 𝐹𝐹 in part (a) instead of obtaining an implicit relationship.

• Some students did not calculate correctly the drag as 𝐹𝐹 =𝜏𝜏𝜏𝜏.

• Some students did not calculate correctly the area as 𝜏𝜏 = 2𝜋𝜋𝑅𝑅𝜋𝜋.

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