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A world-sheet is then an embedded surface, that is, an embedded 2-manifold , such that the induced metric has signature (, +) everywhere. Consequently it is possible to locally define coordinates ( τ , σ ) {\displaystyle (\tau ,\sigma )} where τ {\displaystyle \tau } is time-like while σ {\displaystyle \sigma } is space-like .
More Magic Triangle image mnemonics in the style of a cheat-sheet for high-school physics – in the SVG file, hover over a symbol for its meaning and formula. This is a categorized list of physics mnemonics .
The first nine blocks in the solution to the single-wide block-stacking problem with the overhangs indicated. In statics, the block-stacking problem (sometimes known as The Leaning Tower of Lire (Johnson 1955), also the book-stacking problem, or a number of other similar terms) is a puzzle concerning the stacking of blocks at the edge of a table.
The lab notebook is typically permanently bound and pages are numbered. Dates are given as a rule. All entries are with a permanent writing tool, e.g., a ballpoint pen (though a permanent marker may be undesirable, as the ink might bleed through multiple pages). The lab notebook is usually written as the experiments progress, rather than at a ...
In physics, there are equations in every field to relate physical quantities to each other and perform calculations. Entire handbooks of equations can only summarize most of the full subject, else are highly specialized within a certain field. Physics is derived of formulae only.
An Ohio couple who tortured their five adopted sons in “dungeon”-like conditions and deprived them of food and water, among other abuses, has been sentenced after taking a plea deal.
Symbol Name Meaning SI unit of measure nabla dot : the divergence operator often pronounced "del dot" per meter (m −1) : nabla cross : the curl operator often pronounced "del cross"
2025 Golden Globes live updates: Adrien Brody, Fernanda Torries win top acting honors. Entertainment. People. Kylie Jenner sneaks a kiss and adorably snaps a photo of boyfriend Timothée Chalamet