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Science & Physics 4 all
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Λύσεις ασκήσεων Φυσικής και Μαθηματικών όλων των τάξεων και λυμένα θέματα Πανελληνίων.
Λύσεις ασκήσεων Φυσικής και Μαθηματικών όλων των τάξεων και λυμένα θέματα Πανελληνίων.

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A hypotrochoid is a roulette traced by a point P attached to a circle of radius b rolling around the inside of a fixed circle of radius a, where P is a distance h from the center of the interior circle. The parametric equations for a hypotrochoid are:
x=(a-b)cost + hcos[(a-b)t/b]
y=(a-b)sint + hsin[(a-b)t/b]
#sciphy4all #science #physics #math #maths #mathematics #hypotrochoid #circle #radius #rolling #parametric #equation #ellipse

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Space-shuttle tile material can be handled while red-hot.

The blocks are mostly air and silica fibers, both of which are terrible conductors of heat. The center will stay blazingly hot for hours, but very little of that heat gets carried to the surface.

#sciphy4all #science #physics #material #silica #fibers #conductor #heat

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