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 (To Win Your Love) What Does It Take (To Win Your Love) "What Does It Take (To Win Your Love)" is a 1968 song that was a 1969 hit single by Jr. Walker & The All Stars. The single was one of Jr. Walker's most successful releases, becoming a hit on both the R&B and pop singles charts. "What Does It Take (To Win Your Love)," written by Johnny Bristol, Harvey Fuqua, and Vernon Bullock, made it into the top five on the Hot 100, and became Jr. Walker's second number one on the R&B charts. The song was also a hit in the