SAMPLE ASSIGNMENT

# SAMPLE ASSIGNMENT - SAMPLE ASSIGNMENT The fairy fly is...

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S AMPLE A SSIGNMENT The fairy fly is reputedly the smallest flying insect. In fact, the feathery appendages can barely be considered wings. How is it that a fairy fly can fly? Hints: The drag coefficient (C d ) and its relation to the Reynolds number (Re) may give some insight into the effect of small size on air-borne animals. Considering acceleration versus air friction may also offer insight into how a fairy fly can fly (for example, comparative estimates of terminal velocity). The viscosity ( ! ) of air is 1.716 • 10 –5 poise at 0ºC, 1.813 • 10 –5 poise at 20ºC, 1.907 • 10 –5 poise at 40ºC. A poise has units of Pa sec; Pascal (Pa) has units of N m –2 ; Newton (N) has units of kg m sec –1 . The kinematic viscosity ( " ) of air is 1.327 • 10 –5 m 2 sec –1 at 0ºC, 1.505 • 10 –5 m 2 sec –1 at 20ºC, 1.691 • 10 –5 m 2 sec –1 at 40ºC. The kinematic viscosity is the viscosity divided by the density ( " = !/# ) (m 2 sec –1 = N m –2 / kg m –3 ).

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## This note was uploaded on 10/25/2010 for the course BIOPHYS 2090 taught by Professor R.r.l during the Fall '10 term at Maple Springs Baptist Bible College.

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SAMPLE ASSIGNMENT - SAMPLE ASSIGNMENT The fairy fly is...

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