Anemometer is blowing on the back of the cup on the opposite end of the cross. Since a hollow hemisphere has a drag coefficient of .38 on the spherical side and 1.42 on the hollow side, more force is generated on the cup that is presenting its hollow side to the wind. Because of this asymmetrical force, torque is generated on the axis of the anemometer, causing it to spin. Theoretically, the speed of rotation of the anemometer should be proportional to the wind speed, because the force produced on an object is proportional to the speed of the fluid flowing
What Does It Take (Dave Days song) What Does It Take (Dave Days song) "What Does It Take" is a song by American singer Dave Days. It served as the third and final single from his 2010 EP "Dinner and a Movie". It is one of Dave's most recognizable songs, and was also played on Disney Channel's So Random!. The song's music video is set in a high school, where Dave realizes he has gotten the lead part in the school play. Amanda Lynn (Days' interest in the video) sees she has gotten the second lead, and runs to her boyfriend, who ignores her. Days and Lynn