# CU-Boulder ATOC 1070 - Lab5 (3 pages)

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## Lab5

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## Lab5

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Atoc 1070 - Weather and the Atmosphere Laboratory
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Sarah Rose Lab 5 Wind Tunnel Experiments Question 1 Our experimental value of n was n 1 9763 This value is less then 2 meaning the errors we due to wind speeds measured higher than actual wind speeds Condition A and or pressure was measured lower then actual pressure Condition D The inaccurate wind speed could be caused by the positioning of the pitot tube and the anemometer Holding the anemometer too far away from the end of the wind tunnel or at an angle other then directly facing the source of the wind could effect the recorded wind speeds Other potential errors could have come from the fact that the wind tunnel is not completely sealed Air leaking out would effect this experiment by lowering the air pressure which is congruent with Condition D Also the unrealistic wind simulation from the Variac might cause results that don t match up with real life scenarios because wind doesn t normally behave the way we treated it in this experiment There was also potential for measuring errors when we upped the Variac settings it is possible that we didn t wait long enough to take the measurements and the pressure wind speed were still in transition from one setting to the next Question 2 The type of miniature car we used was a sedan and it took 9 m s of wind to push the car out of the tube To convert 9 m s to mph 9 2 3 20 7 mph which doesn t seem like a wind speed capable of pushing over a car or even a human Acording to this lab it would take 9 4 36 mph to turn over a car This value of 20 mph seems much too low It would take hurricane force winds to over turn or move a car that size and 20 7 mph winds are associated with a breeze that barely move trees It would take 80 mph winds to move something like a car and those most likely occur with hurricanes Once big difference between the lab model and real life is the difference in friction In real life the frictional layer is a large factor for wind speeds in the wind tunnel there is hardly anything to cause friction except the

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