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A question about ultimate computation capability

If we consider the physical limit of computational capability of a system with average energy $E$, then (1) According to Margolus and Levitin, a quantum system with average energy $E$ takes time at ...
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Scales and Hooke's Law

Bob weighs $B$ kg and when he steps on a scale, the spring inside gets compressed by $c$ meters. Assuming the scale obeys Hooke's Law, if Alice weights $A$ kg, how much work is done compressing the ...
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Length of liquid in capillary tube

A long capillary tube with both ends open is filled with water and then set in a vertical position in air.What is the length of liquid column remaining in the tube ? Surface tension of water is ...