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As a general rule, verbs that in the present have an akkusative object form the perfect with haben. The rest with sein. For example:

The table breaks = Der Tisch bricht. [ Subject Nominative: tisch...

Momentum is conserved. MU + mu = (M+m)v   (1200 x 8) + (800 x 0) = (1200 + 800)v 9600 = 2000v v = 9600/2000 = 4.8m/s

Reversible is a term used for certain reactions that never reach a final stage. So imagine we have A and B reacting together to form C, and we say that this reaction is reversible. So at a point in time, ...

Imagine a cell like a rectangle, of which one side has finger-like projections (this side faces the intestinal lumen) called the villi, and the other side is flat - the base membrane of that cell that is....

The function document.onready() will call code given as an arguement once the Document Object Model is fully loaded. The function is useful because it allows javascript to be called once the page is built...