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
Individual Deprivation Measure action. The IDM can help governments and organisations target poverty more effectively as well as help them measure success or failure, revealing what aspects of poverty are changing, by how much and for whom. The IDM is the first poverty measure in the world based on the views of women and men with lived experience of poverty. The dimensions were informed by how women and men think poverty should be defined and what needs to improve in order to move out of poverty. The first research phase of the Individual Deprivation Measure started in 2009. It was a four-year, international,