Last Unit Flashcards
Perturbation
A small motion away from static or dynamic equilibrium
1 Au ( astronomical unit )
Mean distance from center of earth to center of sun
Kepler’s 1st law
Teh law of orbits : planetary orbits are elliptical with the sun at one focus
Keplers 2nd law
A planet sweeps out equal areas in equal time as it orbits the sun
A line that connects a planet to teh sun sweeps out equal areas in equal time
Kepler’s third law
Period square is proportional to the cube of its major(semi-major) axis length cubed
Centripetal force
Force towrds teh center of a circle
Biconcave lens
Has bioth sides curved inwards towards teh middle. Has teh effct of refracting rays that are parallel to teh axis of teh lens outwards.
Biconvex lens
Both sides curved outwards from teh middle. Has the effect of refracting rays that are parallel to the axis of teh lens inwards so that cross at a focal point
Cornea refractive index
1.4
