E n y w a n t to d a t e i am 11 and i like baseball i am a boy

Suppose that a comet that was seen in 563 a.d. by chinese astronomers was spotted again in year 1951. assume the time between observations is the period of the comet and take its eccentricity as 0.986. what are (a) the semimajor axis of the comet's orbit and (b) its greatest distance from the sun?

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?