| FUVEST 2026 | Q72 - UM ARTIGO RECENTEMENTE PUBLICADO NA REVISTA PHYSICS OF FLUIDS INVESTIGOU DE

I am Felipe Filatte, a teacher and pedagogical coordinator, specializing in ENEM and university entrance exams. Here you will find commented solutions, focusing on understanding the reasoning and gaining confidence in the exam. 🎁 FREE GIFT FOR THOSE PREPARING FOR THE ENEM ENEM TRI Calculator Spreadsheet https://docs.google.com/spreadsheets/... 📂 LINK TO THE DRIVE WITH PREVIOUS FUVEST EXAMS https://drive.google.com/drive/folder... STATEMENT Park, E. et al. "Pour-over coffee: Mixing by a water jet impinging on a granular bed with avalanche dynamics". Phys. Fluids 37, 043332 (2025). Adapted. A recently published article in the journal Physics of Fluids investigated how factors such as the height and speed of the water poured in the preparation of filtered coffee (part (a) of the figure) influence the taste of the finished beverage. One of the important parameters is the speed of the water jet when it hits the layer of water already in the filter. One of the study's conclusions is that speeds above 2 m/s lead to better mixing of the coffee grounds with the water. Part (b) of the figure schematizes the described situation, where H is the height of the water layer and D is the height of the water poured from the pot, measurements taken from the base of the filter. Assuming the jet's velocity is negligible when the water begins to be poured onto the spout of the kettle, for a height H = 8 cm, what is the minimum pouring height D so that the jet's velocity, upon hitting the water, is at least 2 m/s? A) 4 cm B) 8.2 cm C) 10 cm D) 18 cm E) 28 cm Note and adopt: Water density (specific mass): d = 1000 kg/m³ Acceleration due to gravity: g = 10 m/s² Answer: ✅ Alternative E #fuvest #fuvest2026 #commentedquestions #physics #mechanics #kinematics #freefall #mechanicalenergy #fluids #coffee #entranceexams #medicine #professorfilatte #enem #tri