2
votes
Is the pressure-gradient force that causes hydrostatic equilibrium entropic, contact, or both?
Two thoughts occur to me.
First, we can model an ideal gas by allowing that there are short-range repulsive forces between molecules (the 'hard spheres' model), and the molecules themselves take up a ...
- 47.1k
1
vote
Why is this happening to the milk?
It probably is a surface tension effect with the milk not wetting the plastic surface.
Creating surface requires the input of energy and the reverse is also true.
The milk starts off with a very large ...
- 78.2k
1
vote
Shear force oscillating plate
Yes. Simply because no other force can push things in the horizontal direction in this setup.
- 414
1
vote
Accepted
A question on Hydraulics from a 19th century book
Take a strong glass tube about three feet in length, and tie over one end a piece of well-soaked bladder. When thoroughly dry, . . . .
The dry bladder provides a stiff and air-tight seal at one end of ...
- 78.2k
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