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When do we use haben and when sein with the perfect.

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, verb: br...
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Answered by Antonis T. • German tutor
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A truck with mass 1200kg is moving at 8m/s when it collides head-on with a stationary car of mass 800kg. As they collide, the vehicles move together with the same velocity, v. Calculate this velocity.

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
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Answered by Rachel H. • Physics tutor
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What does reversible mean?

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, in ...
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Answered by Antonis T. • Chemistry tutor
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How is the concentration of sodium altered in a cell in the intestines and why is glucose absorption affected?

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. On...
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Answered by Antonis T. • Biology tutor
3162 Views

What does the document.onload() function do and why is it useful?

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 en...
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Answered by Declan D. • Javascript tutor
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