From Talk2000.NL
W&T klas 2 2008-2009
2009: Geluid
1: natuurkunde les 8
(leeg)
2: natuurkunde les 9
(leeg)
3: wiskunde les 1
brandpunt parabool spiegel
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- Met een schotelantenne versterk je signalen van uit de ruimte, op 36.000 km afstand.
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- Parabolic curve showing directrix (L) and focus (F). The distance from a given point Pn to the focus is always the same as the distance from Pn to a point Qn directly below, on the directrix.
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- Parabolic curve showing arbitrary line (L), focus (F), and vertex (V). L is an arbitrary line perpendicular to the axis of symmetry and opposite the focus of the parabola from the vertex (i.e. farther from V than from F.) The length of any line F - Pn - Qn is the same. This is similar to saying that a parabola is an ellipse, but with one focal point at infinity.
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- bron
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4: biologie les X
- N a v i g a t i e -
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