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8 Terms
A
alumina is better at handling stress and forces in the presence of a crack
polystyrene has a better toughness - better in impact resistance - can absorb more energy
A
an oar is assumed to behave as a
beam loaded in bending
a telescope is? it costs?
a reflector as a single rigid mirror
$300
mirrors have been made of?
glass, silvered on the front surface
none of the optical properties of the glass is used its used for its mechanical properties only
70 tones of glass support 30 grams of silver
why does a mirror need to be light
it will deflect under its own weight, this distortion changes the focal length and introduces aberrations - it must be small enough that it does not interefere with performance
a telescope panel is treated like a
panel
