# Tag Info

## New answers tagged stress-strain

0

Let the hammer that strikes the string moves a distance $\Delta x$ above the string and then hit the string back due to gravity. Or take some other mechanism like a spring which puts the note back to the unpressed position after pressing that note. The time it takes to get a particular note back to unpressed position after it being pressed is the main factor ...

0

It will definitely be the inertia of piano action mechanism. The fact (or construction problem), that you can't repeat a tone fast enough is a real evergreen throughout the history of keyboard instrument development (read more here). Usually the trade-off for lower repetition rate is higher sensitivity of the key. Sci-fi appendix: But right, let's suppose ...

4

Yes. The tear is initiated at stress concentrations around the holes, where stress is highest. After initiation, the tear continues to propagate along the line of highest stress. Stress is a function of force and geometry ($\sigma_{n} = \frac {F}{A_{n}}$). In a piece of paper without holes, the stress is uniform, and the paper tears when stress exceeds ...

1

Stress is force per unit area. There is a force from below (the surface pushing up) and above (the weight pushing down). These have to be equal and opposite so the cube doesn't accelerate anywhere. You take just one times this force to compute the stress. The sign is a matter of convention - according to this lecture the sign of compressive stress is ...

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