Obtain an average value for a small distance and for a short interval of time by measuring multiples (including the period of a pendulum)

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?

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

An electric current in a wire will push or pull on a permanent magnet. which statement best explains how an electric current creates an electromagnetic force on another magnet?