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 ...
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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 ...
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1 vote

Shear force oscillating plate

Yes. Simply because no other force can push things in the horizontal direction in this setup.
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  • 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 ...
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