Which atom is involved in giving your heart energy to beat?

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?

What is the role of lenses in microscopy?

If anyonee has done the momentum lab practical in physics can you give me the answers i am s lostt rnn : (