The power of water!
Thread Content
Xiao Zhang accidentally joined a doctoral group. Someone asked: If a drop of water falls freely from a very great height and hits a person, could it injure or even kill that person? The group immediately became lively, with various formulas, assumptions, and types of resistance discussed, as well as calculations related to gravity and acceleration; the discussion lasted nearly an hour. At that moment, Xiao Zhang quietly asked, \"Haven’t you guys ever been in the rain?\" A deathly silence fell over the group... And then, Xiao Zhang was kicked out of the group.
Digging a hole for people to jump into – of course, no one likes that
If we ignore what’s obvious without bringing it up, can we still have a proper conversation?
Stokes sedimentation – particle sedimentation velocity refers to the downward movement speed of aerosol particles under the influence of gravity; it is derived from Stokes’ law of drag, which is why it is also known as Stokes velocity. The smaller the particles, the slower their settling speed; therefore, it is almost impossible for small particles to settle to the ground through gravity
I also asked experts in the group; of course, I was laughed at as well. But one expert said this, and it is this expert who is truly an expert