Dogs' water dumping is selected for 2025 USA PhO Mechanics Questions
Friends who have kept pets know that dogs who are wet in the rain or have just taken a shower will dry the water attached to their hair by themselves. So is there any rule in the frequency of animals turning repeatedly to shake water? In 2012, Professor Hu from Georgia Tech's Department of Mechanical Engineering led his team to study the water-swinging movements of 33 animals. They found that the frequency of animal water swing f has a very simple relationship with body weight 
M. Using a simple physical model, taking into account the effects of centrifugal force and siphon force, they found that this relationship could be derived from first principles. 13 years later, this research became the prototype of the 2025 USA PhO mechanics problem. From this we can see that the American physics competition focuses on physical modeling and combining scientific research practice.
All the main teachers of APEX Science Academy are active on the front line of scientific research. The course we prepared for USA PhO APEX P06 not only teaches the physics knowledge required for the competition, but more importantly, cultivates students' physical thinking and practical abilities.